2014 Vol. 29 No. 2
Abstract：
Analysis was performed on correlation between crack arrest temperature and nil-ductility transition temperature of AH36, EH36 and FH500 ship steels based on experimental results of double tension test and drop weight test. Some relationship exists between crack arrest temperature and nil-ductility transition temperature for three steels, which reflecting the correlation between the two test methods.
Analysis was performed on correlation between crack arrest temperature and nil-ductility transition temperature of AH36, EH36 and FH500 ship steels based on experimental results of double tension test and drop weight test. Some relationship exists between crack arrest temperature and nil-ductility transition temperature for three steels, which reflecting the correlation between the two test methods.
2014, 29(2): 5-10.
DOI: 10.19515/j.cnki.1003-1545.2014.02.003
Abstract：
This paper mainly studied skeleton adhesive, rubber oil resistance and strength of tape in the weft and radial direction compared and selected, body materiais adhesive system, curing system and reinforcing materials. The results showed that the NBR/PVC=70/30 is chosen as the main material, the silica is chosen as adhesive system, vulcanization system with high and low sulfur system with RFL surface dipping treatment of zonal enhanced NN250 canvas, fabric, glue stick and skeleton oil resistance comprehensive optimum, and the strength of tape in the weft and radial direction of the gas holder tape could fully satisfy the requirements of more than 3. 5 kN/3m. and can be used as a petrochemical sealing film tape.
This paper mainly studied skeleton adhesive, rubber oil resistance and strength of tape in the weft and radial direction compared and selected, body materiais adhesive system, curing system and reinforcing materials. The results showed that the NBR/PVC=70/30 is chosen as the main material, the silica is chosen as adhesive system, vulcanization system with high and low sulfur system with RFL surface dipping treatment of zonal enhanced NN250 canvas, fabric, glue stick and skeleton oil resistance comprehensive optimum, and the strength of tape in the weft and radial direction of the gas holder tape could fully satisfy the requirements of more than 3. 5 kN/3m. and can be used as a petrochemical sealing film tape.
2014, 29(2): 11-16.
DOI: 10.19515/j.cnki.1003-1545.2014.02.004
Abstract：
Based on the finite element analysis as well as the stiffness calculation of rubber vibration isolator, combined with the relation between rubber hardness and rubber mechanical constant symbolized by C10and C01, this paper introduces a flow chart for rubber vibration isolator design and development, and an application instance has been given. The rubber hardness were reversely designed for a fixed stiffness isolator from the flow chart, by which the design efficiency of the rubber vibration isolator is enhanced.
Based on the finite element analysis as well as the stiffness calculation of rubber vibration isolator, combined with the relation between rubber hardness and rubber mechanical constant symbolized by C10and C01, this paper introduces a flow chart for rubber vibration isolator design and development, and an application instance has been given. The rubber hardness were reversely designed for a fixed stiffness isolator from the flow chart, by which the design efficiency of the rubber vibration isolator is enhanced.
2014, 29(2): 17-21.
DOI: 10.19515/j.cnki.1003-1545.2014.02.006
Abstract：
NBR/PVC is widely used in the rubber industry because of its oil resistance, ozone resistance and weather-resistance. However, affected by PVC, the adhesive properties between NBR/PVC and nylon framework material is not perfect enough, this limits their further application in rubber adhesive tape products. This paper studies the effect of vulcanization system, reinforcing system and plasticizing system on adhesive properties. Tests showed that by optimizing the formulation design, the use of raw moterials commonly used in the rubber industry can achieve excellent adhesion properties of blended rubber.
NBR/PVC is widely used in the rubber industry because of its oil resistance, ozone resistance and weather-resistance. However, affected by PVC, the adhesive properties between NBR/PVC and nylon framework material is not perfect enough, this limits their further application in rubber adhesive tape products. This paper studies the effect of vulcanization system, reinforcing system and plasticizing system on adhesive properties. Tests showed that by optimizing the formulation design, the use of raw moterials commonly used in the rubber industry can achieve excellent adhesion properties of blended rubber.
Abstract：
This paper describes experiment investigations of the effect of constrained damping layers on vibration control of ship structural panels. The structural damping effects of different configurations as well as the positioning of exciting points have been investigated. The test results show that:(1) The vibration level of ship structural panels can always be decreased to some exteat after adding constrained damping layers. (2) The picking up distance way from exciting sources have some influence on the damping capacity, near the position of exciting sources, the damping effects perform not well. (3) The effectiveness of damping layers is relevant with the exciting style and positioning of damping layers, local damping layer treatments can obtain a better damping effect than that of whole treatments to target specific vibration mode of structural panel.
This paper describes experiment investigations of the effect of constrained damping layers on vibration control of ship structural panels. The structural damping effects of different configurations as well as the positioning of exciting points have been investigated. The test results show that:(1) The vibration level of ship structural panels can always be decreased to some exteat after adding constrained damping layers. (2) The picking up distance way from exciting sources have some influence on the damping capacity, near the position of exciting sources, the damping effects perform not well. (3) The effectiveness of damping layers is relevant with the exciting style and positioning of damping layers, local damping layer treatments can obtain a better damping effect than that of whole treatments to target specific vibration mode of structural panel.
2014, 29(2): 27-31.
DOI: 10.19515/j.cnki.1003-1545.2014.02.008
Abstract：
Based on the FEM of the stand before and after damping treatment, The natural frequency and mode damping ratios was obtained by simulation. The result show that the simulation was efficient by the vibration experiments. The methods can be used to estimated damping material's vibration reduce effects.
Based on the FEM of the stand before and after damping treatment, The natural frequency and mode damping ratios was obtained by simulation. The result show that the simulation was efficient by the vibration experiments. The methods can be used to estimated damping material's vibration reduce effects.
Abstract：
The element distribution character in thickness direction of continuously cast continuously rolling 10CrNiCu steel plate was studied by laser in situ analysis technology. The results show that the content of C in lower surface is higher than that of upper surface, the segregation micro zone of P and S scatter finely, Mn, Ni, Cr, Si are central positive segregation and distribute symmetrically along the center line of the steel plate, Cu is well-distributed, the relationship between segregation and radius of element atom is inverse proportional, the segregation of C is most significant, the segregation of P, S, Si are medium, the segregation of Mn, Ni, Cr, Cu are minute.
The element distribution character in thickness direction of continuously cast continuously rolling 10CrNiCu steel plate was studied by laser in situ analysis technology. The results show that the content of C in lower surface is higher than that of upper surface, the segregation micro zone of P and S scatter finely, Mn, Ni, Cr, Si are central positive segregation and distribute symmetrically along the center line of the steel plate, Cu is well-distributed, the relationship between segregation and radius of element atom is inverse proportional, the segregation of C is most significant, the segregation of P, S, Si are medium, the segregation of Mn, Ni, Cr, Cu are minute.
Abstract：
Effect of interpass temperature on mechanical property of 10CrNi5MoV steel gas shielded welding joint was investigated in two different energy input by yield strength, impact toughness testing and tissue analysis. The results indicated that when the energy input was 8 kJ/cm and 18 kJ/cm, the yield strength of weld metal monotonic decreased from 868 MPa and 855 MPa to 728 MPa and 693 MPa respectively, impact toughness at- 50℃ of weld metal rised from 70 J and 69 J to 117 J and 72 J(interpass temperature was 200℃ and 100℃ respectively), then reduced to 67 J and 43 J. The difference in the tissue made the mechanical property changed with the interpass temperature elevated. With interpass temperature rised from 40℃ to 300℃, the content of martensite structure in weld metal gradually disappeared, granular bainite structure gradually increased, acicular ferrite structure increased first, and then decreased. The interpass temperature corresponded to the peak of acicular ferrite structure content was consistent to the peak of the impact toughness.
Effect of interpass temperature on mechanical property of 10CrNi5MoV steel gas shielded welding joint was investigated in two different energy input by yield strength, impact toughness testing and tissue analysis. The results indicated that when the energy input was 8 kJ/cm and 18 kJ/cm, the yield strength of weld metal monotonic decreased from 868 MPa and 855 MPa to 728 MPa and 693 MPa respectively, impact toughness at- 50℃ of weld metal rised from 70 J and 69 J to 117 J and 72 J(interpass temperature was 200℃ and 100℃ respectively), then reduced to 67 J and 43 J. The difference in the tissue made the mechanical property changed with the interpass temperature elevated. With interpass temperature rised from 40℃ to 300℃, the content of martensite structure in weld metal gradually disappeared, granular bainite structure gradually increased, acicular ferrite structure increased first, and then decreased. The interpass temperature corresponded to the peak of acicular ferrite structure content was consistent to the peak of the impact toughness.
Abstract：
The effects of different heat treatment and cold deformation on microstructure and properties of lead frame alloy CuNiSiCr were studied. The results showed that the new CuNiSiCr alloy solid solution treated at 930℃ for 1 hour, and then 30% of cold deformed, followed by aging treatment at 500℃ for 3. 5 hours. The hardness and conductivity of CuNiSiCr alloy can achieve better cooperation.
The effects of different heat treatment and cold deformation on microstructure and properties of lead frame alloy CuNiSiCr were studied. The results showed that the new CuNiSiCr alloy solid solution treated at 930℃ for 1 hour, and then 30% of cold deformed, followed by aging treatment at 500℃ for 3. 5 hours. The hardness and conductivity of CuNiSiCr alloy can achieve better cooperation.
Abstract：
The explosion welding process of aluminium alloy 6061(thickness of 28 mm) and stainless steel 304L(thickness of 4mm) was investigated. The resutls showed that with stainless steel for base plate, pare aluminium for transition layer and aluminium alloy(thickness of 12 mm and 16 mm) for fly plate, qualified thick aluminium alloy-thin stainless steel clad plate could be obtained after three times of explosion welding.
The explosion welding process of aluminium alloy 6061(thickness of 28 mm) and stainless steel 304L(thickness of 4mm) was investigated. The resutls showed that with stainless steel for base plate, pare aluminium for transition layer and aluminium alloy(thickness of 12 mm and 16 mm) for fly plate, qualified thick aluminium alloy-thin stainless steel clad plate could be obtained after three times of explosion welding.
Abstract：
Two different test methods are used to test the compressive properties of T700/5429 laminated connecting structure. The composites laminations are both connected with a single bolt, but in one test method, the sample is under the state of single side shearing and in the other test method the sample is under the double side shearing. The effect of different test methods on the compressive properties of the sample is analyzed. It is shown that effective compressive failure mode appear at the connecting hole of the sample in the two test methods. But in the single side shearing test method, the stability of the test is poor and the discreteness of the testing data is large. And the limited compressive strength and the offset compressive strength tested based on the single side shearing test method is lower than that of the double side shearing test method. So the double side shearing test method is more suited to test the allowable value of the composites laminated connected structure.
Two different test methods are used to test the compressive properties of T700/5429 laminated connecting structure. The composites laminations are both connected with a single bolt, but in one test method, the sample is under the state of single side shearing and in the other test method the sample is under the double side shearing. The effect of different test methods on the compressive properties of the sample is analyzed. It is shown that effective compressive failure mode appear at the connecting hole of the sample in the two test methods. But in the single side shearing test method, the stability of the test is poor and the discreteness of the testing data is large. And the limited compressive strength and the offset compressive strength tested based on the single side shearing test method is lower than that of the double side shearing test method. So the double side shearing test method is more suited to test the allowable value of the composites laminated connected structure.
Abstract：
The performance of two electrodes-a titanium- based oxide electrode(DSA) and a boron- doped diamond electrode(BDD) was investigated by comparing the degradation ability of two electrodes on recalcitrant pollutants- phenol in electrolytic sewage system. The electrochemical behaviors of the electrodes were investigated by cyclic voltammetry. Making methylene blue as an oxide trapping agent, in the same experimental conditions, the speed that the DSA electrodes produce ClO- is much larger than the speed BDD electrode produce ·OH. Phenol solution was electrochemical oxidation gradated for 48 hours with two electrodes respectively; the result shows that the removal rate of phenol is almost 100% by BDD electrode while it is only 35. 61% by IrO2- RuO2 electrode. The removal rate of COD in wastewater is 27. 83% by IrO2- RuO2 electrode and 95. 35% by BDD electrode in which intermediate products is not easy to be accumulate. The BDD electrode exhibits good application prospect in environmental protection.
The performance of two electrodes-a titanium- based oxide electrode(DSA) and a boron- doped diamond electrode(BDD) was investigated by comparing the degradation ability of two electrodes on recalcitrant pollutants- phenol in electrolytic sewage system. The electrochemical behaviors of the electrodes were investigated by cyclic voltammetry. Making methylene blue as an oxide trapping agent, in the same experimental conditions, the speed that the DSA electrodes produce ClO- is much larger than the speed BDD electrode produce ·OH. Phenol solution was electrochemical oxidation gradated for 48 hours with two electrodes respectively; the result shows that the removal rate of phenol is almost 100% by BDD electrode while it is only 35. 61% by IrO2- RuO2 electrode. The removal rate of COD in wastewater is 27. 83% by IrO2- RuO2 electrode and 95. 35% by BDD electrode in which intermediate products is not easy to be accumulate. The BDD electrode exhibits good application prospect in environmental protection.
Abstract：
To explore the catalytic activity of gold nanoparticles in this paper is demostrated. With sodium borohydride as the hydrogen donor, the catalytic reaction based on the reduction of p-nitrophenol by synthesized AuNFs or AuNPs was carried out at the different temperature. The results show that the reaction temperature was negatively correlated with the time. At 50℃, the reaction time of AuNFs was 7 min; at 37℃, AuNFs was 15 min; at 20℃, AuNFs was 45 min. The reaction was first order kinetics. And the Ea value of AuNFs was 37. 97 kJ/mol, smaller than AuNPs' 51. 51 kJ/mol. The catalytic activity of AuNFs is stronger than that of AuNPs.
To explore the catalytic activity of gold nanoparticles in this paper is demostrated. With sodium borohydride as the hydrogen donor, the catalytic reaction based on the reduction of p-nitrophenol by synthesized AuNFs or AuNPs was carried out at the different temperature. The results show that the reaction temperature was negatively correlated with the time. At 50℃, the reaction time of AuNFs was 7 min; at 37℃, AuNFs was 15 min; at 20℃, AuNFs was 45 min. The reaction was first order kinetics. And the Ea value of AuNFs was 37. 97 kJ/mol, smaller than AuNPs' 51. 51 kJ/mol. The catalytic activity of AuNFs is stronger than that of AuNPs.
Abstract：
Anatase TiO2 nanowires(TNWs) were prepared by hydrothermal technique. The effects of hydrothermal reaction time, hydrothermal reaction temperature and concentration of NaOH on the morphology of TNWs were studied. XRD and SEM were used to characterise the the composition and morphology of TNWs respectively. TNWs and TiO2(P25) were dispersed in the blended solvent of water and ethanol, receiving uniform and stable slurry. The slurry was coated on surface of the stainless steel substrate to test photoelectric performance. The results show that thin film exhibits the best photovoltaic performance when the doping content of TNWs is 5%(w).
Anatase TiO2 nanowires(TNWs) were prepared by hydrothermal technique. The effects of hydrothermal reaction time, hydrothermal reaction temperature and concentration of NaOH on the morphology of TNWs were studied. XRD and SEM were used to characterise the the composition and morphology of TNWs respectively. TNWs and TiO2(P25) were dispersed in the blended solvent of water and ethanol, receiving uniform and stable slurry. The slurry was coated on surface of the stainless steel substrate to test photoelectric performance. The results show that thin film exhibits the best photovoltaic performance when the doping content of TNWs is 5%(w).
Abstract：
Foam concrete is a new port terminal retaining wall backfill material, with such properties as lightness, strong independence and anti-water, and the foaming agent is very important for the properties of foam concrete. The improved foam concrete foaming agent is a concentration of 0. 8% AOS solution as foaming agent mother liquor, selecting a stable foam material A, B, C, and D to modify mother liquor, and the foam properties were analysed. The foam surface of this foam concrete foaming agent was smooth and lucidus, with foam stability was fine, and the foam multiple was 46. 7, 1h sedimentation distance was 1. 2mm, 1h secretion of water was 15. 7 ml. The foaming agent was used to prepare foam concrete for retaining wall backfilling, and the products showed good mechanical properties and anti-water performance.
Foam concrete is a new port terminal retaining wall backfill material, with such properties as lightness, strong independence and anti-water, and the foaming agent is very important for the properties of foam concrete. The improved foam concrete foaming agent is a concentration of 0. 8% AOS solution as foaming agent mother liquor, selecting a stable foam material A, B, C, and D to modify mother liquor, and the foam properties were analysed. The foam surface of this foam concrete foaming agent was smooth and lucidus, with foam stability was fine, and the foam multiple was 46. 7, 1h sedimentation distance was 1. 2mm, 1h secretion of water was 15. 7 ml. The foaming agent was used to prepare foam concrete for retaining wall backfilling, and the products showed good mechanical properties and anti-water performance.
Abstract：
Under cantilever bending loading, pertinence of surface crack length 2c to displacement of loaded point of the specimen was investigated, which was controlled by cyclic load with five notched smooth plate specimens. The results showed that there was no correlation between 2c and displacement valley-value of loaded point, but the correlation between 2c and displacement peak-value DPof loaded point is very obvious. During the original stage of surface crack propagation, DPkeeps nearly a constant and with further propagation of surface crack, DPbegins to increase and at the last stage of surface crack propagation, DPincreases obviously. At the median and last stage, 2c and DPsatisfies a relation of polynomial increased by degrees. The function relation of 2c and DPwould provide reference for measuring surface crack length automatically under the conditions of complicated circumstance.
Under cantilever bending loading, pertinence of surface crack length 2c to displacement of loaded point of the specimen was investigated, which was controlled by cyclic load with five notched smooth plate specimens. The results showed that there was no correlation between 2c and displacement valley-value of loaded point, but the correlation between 2c and displacement peak-value DPof loaded point is very obvious. During the original stage of surface crack propagation, DPkeeps nearly a constant and with further propagation of surface crack, DPbegins to increase and at the last stage of surface crack propagation, DPincreases obviously. At the median and last stage, 2c and DPsatisfies a relation of polynomial increased by degrees. The function relation of 2c and DPwould provide reference for measuring surface crack length automatically under the conditions of complicated circumstance.
Abstract：
This paper introduced the development of silicone anticorrosion coatings with different colours, which could resist high temperatiue up to 600℃ and used on outer wall of pipetine for ships. The test results showed that the coatings had excelent thermal resistance, mechnical properties, physical and chemical performance and ocean environment resistance.
This paper introduced the development of silicone anticorrosion coatings with different colours, which could resist high temperatiue up to 600℃ and used on outer wall of pipetine for ships. The test results showed that the coatings had excelent thermal resistance, mechnical properties, physical and chemical performance and ocean environment resistance.
2014, 29(2): 87-94.
DOI: 10.19515/j.cnki.1003-1545.2014.02.021
Abstract：
Advanced drinking-water purification materials play important roles in improving the safety and health of drinking water. In this paper, the status of advanced drinking water purification materials was summarized, and the drawbacks in the process of application were presented, the developmental trends of advanced drinking water purification materials were prospected.
Advanced drinking-water purification materials play important roles in improving the safety and health of drinking water. In this paper, the status of advanced drinking water purification materials was summarized, and the drawbacks in the process of application were presented, the developmental trends of advanced drinking water purification materials were prospected.
2014, 29(2): 95-98,104.
DOI: 10.19515/j.cnki.1003-1545.2014.02.022
Abstract：
According to the requirements of the mechanical seal on the sealing materials, The properties of silicon carbide in the different sintering, include mechanical properties, corrosion resistance and tribological properties were reviewed. Since the silicon carbide has excellent performance as a sealing material, it can be widely used in high-pressure, high speed, high temperature, corrosive medium, dry friction and containing the solid particles on the operation conditions, and becomes ideal choice of the mechanical seal material.
According to the requirements of the mechanical seal on the sealing materials, The properties of silicon carbide in the different sintering, include mechanical properties, corrosion resistance and tribological properties were reviewed. Since the silicon carbide has excellent performance as a sealing material, it can be widely used in high-pressure, high speed, high temperature, corrosive medium, dry friction and containing the solid particles on the operation conditions, and becomes ideal choice of the mechanical seal material.
Abstract：
The development of high-performance copper base elastic alloy for replacing beryllium copper alloy is the focus of beryllium copper alloy industries. Recent advances in high-performance copper base elastic alloy, such as Cu-Ti, Cu-Ni-Sn, CuNi-Cr, Cu-Ni-Mn, Cu-Ni-Al base alloys, have been summarized. The gap of development and applications of high-performance copper base elastic alloy for replacing beryllium copper alloy between China and developed countries have also been pinpointed.
The development of high-performance copper base elastic alloy for replacing beryllium copper alloy is the focus of beryllium copper alloy industries. Recent advances in high-performance copper base elastic alloy, such as Cu-Ti, Cu-Ni-Sn, CuNi-Cr, Cu-Ni-Mn, Cu-Ni-Al base alloys, have been summarized. The gap of development and applications of high-performance copper base elastic alloy for replacing beryllium copper alloy between China and developed countries have also been pinpointed.
