Experimental investigation on strain concentration in compositelaminates with a circular hole
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摘要: 对复合材料开口缝合补强结构进行了实验研究。测试了不同缝合参数(针距、行距、边距、单重和双重缝合) 补强的含孔复合材料层板的拉伸强度, 研究了孔边应力集中、应变集中对强度、刚度等力学性能参数的影响, 分析讨论了孔边及邻近区域应变集中及应变分布的规律, 得到不同缝合参数、孔边不同位置以及不同载荷条件下的应变集中系数。结合实验结果和分析讨论, 给出了含孔复合材料层板缝合补强的缝合设计参数。Abstract: The effect of stitching reinforcement on st rain concent ration was investigated for the composite laminatescontaining a circular hole. The effect s of stitching parameters , such as stitching needle distance , row spacing , edgedistance , single stitching or double stitching , etc , were compared and analysed. The tensile st rength and stiffnesswere measured for composite laminates containing a circular hole. The st rain concent ration and st rain dist ributionregularity were investigated analytically and experimentally. The hole edge coefficient s of st rain concent ration weremeasured for different stitching parameters , external load , the edge location of the hole , etc. The experimental results show a distinct efficiency of stitching reinforcement for composite laminates containing a circular hole and givethe stitching design parameters on the hole edge. The experiment s show that near the hole region in the loading direction , the st rain concent ration is not influenced under different loads ; with the material bearing compressive deformation , near the hole region in the vertical line of loading direction , the st rain concent ration factors Kε vary withload and can reach a very high value. Compared with isot ropic plates , the Kεof orthot ropic laminates is variable atdifferent edge locations of the hole.
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