An Experimental Study on Ultimate Bearing Strength of Composite Bolt Joint with Interference-fit
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摘要: 本文对复合材料层合板单面螺纹抽钉紧固件干涉配合连接结构和高锁螺栓间隙配合连接结构的静挤压强度进行了试验研究。分别考虑了不同干涉量配合和间隙配合对紧固件连接结构极限挤压强度的影响。在静拉伸试验中,采用了卡口引伸计来实时监测孔的变形量。根据ASTM D 5961挤压试验方法标准,得到极限挤压强度及偏移量为2%的2%偏移挤压强度。试验结果表明,适当的干涉量能提高紧固件结构的静挤压强度,过量的干涉却能降低其静挤压强度。对于研究的复合材料T700/9916和铺层情况,与高锁螺栓的H9/h9间隙配合连接相比,单面抽钉0.5%干涉量配合连接的极限挤压强度能提高1.51%,而3%干涉量配合连接的极限挤压强度下降1.85%。Abstract: Experiments were conducted in order to investigate the static bearing strength of the mechanically fastened composite joints,involving interference-fit joint with blind pumping bolt and clearance-fit joint with high lock bolt.Interference-fits with different interferences and clearance-fit were considered.During static tensile testing,the deformation of the bearing hole was measured by means of extensometer.According to ASTM D 5961 standard test method,the ultimate bearing strength and the 2% offset bearing strength were obtained.Experimental results show that suitable interference can increase the ultimate bearing strength in comparison with the clearance-fit case,and excessive interference can decrease the ultimate bearing strength.For the composite(T700/9916) and laying studied in this paper,when the interference is 0.5%,the ultimate bearing strength is increased by 1.51%,but when the interference is 3%,the ultimate bearing strength is decreased by 1.85%,comparing with the clearance-fit joints.
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Keywords:
- Composite /
- Interference-fit joints /
- Blind bolt /
- Clearance-fit joints /
- Ultimate Bearing strength
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