Volume 34 Issue 6
Dec.  2019
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GAO Yuhao, ZHAO Yang, CHENG Yingjin. Study on Analysis Method of da/dN-ΔK Curves Based on Probability Statistics Theory[J]. Development and Application of Materials, 2019, 34(6): 21-28. DOI: 10.19515/j.cnki.1003-1545.2019.06.005
Citation: GAO Yuhao, ZHAO Yang, CHENG Yingjin. Study on Analysis Method of da/dN-ΔK Curves Based on Probability Statistics Theory[J]. Development and Application of Materials, 2019, 34(6): 21-28. DOI: 10.19515/j.cnki.1003-1545.2019.06.005
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Study on Analysis Method of da/dN-ΔK Curves Based on Probability Statistics Theory

  • Luoyang Ship Material Research Institute, Luoyang 471023, China

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  • Received Date: May 30, 2019
  • Available Online: March 17, 2024
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    • Abstract
  • Through the logarithmic interpolation performed on the data of da/dN and ΔK from the results of crack growth rate test with high strength steel, a p-da/dN-ΔK curve analysis method(da/dN-ΔK method) based on probability statistics theory was established. Compared with the a-N method, it is found that under any reliability p within the effective range of ΔK, the p-da/dN value obtained by da/dN-ΔK method is higher than that obtained by a-N method. When ΔK is the maximum value of 100 MPa·m0.5, the p0.99-da/dN value obtained by da/dN-ΔK method is about 25% higher than that obtained by a-N method. The p-da/dN-ΔK curves obtained by da/dN-ΔK method coincide well with the distribution of da/dN and ΔK in the actual test, which means da/dN-ΔK method is an effective way to obtain the p-da/dN-ΔK curves of materials.
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