夹层结构剪切试验方法分析与改进  

Analysis and improvement of the sandwich shear test method

作　　者：谭永刚[1] 肖军[1] 李勇[1] 董伟锋[1] 原永虎[1] 张佐光[2] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京210016 [2]北京航空航天大学材料科学与工程学院,北京100083

出　　处：《复合材料学报》2008年第3期115-120,共6页Acta Materiae Compositae Sinica

摘　　要：为验证现行夹层结构压剪试验方法对高剪切模量夹层结构的适用性,应用有限元分析了影响该试验方法测量精度的因素,结果表明加载金属板端部弯曲效应对试验精度有较大影响,对高剪切模量芯材的夹层结构影响更甚,当剪切模量高于100 MPa时其误差可超过6%。根据对试验系统参数的分析,提出了一种改进的压剪试验方法,改变加载方式降低弯曲效应,对于剪切模量小于500 MPa的夹层结构,可以将弯曲效应引起的误差降低到小于3%;同时发现新的加载方式对夹具尺寸参数变化的灵敏度降低,有利于提高试验的可靠性。The finite element method was applied to analyze the factors influencing the shear modulus test results with the current press-shear test method in order to verify this test method＇s applicability to sandwich construction with a high shear modulus. The results show that the bending deflection of the loading plate＇s loading end decreases the accuracy of the test results, especially to those with the high shear modulus. The test errors will exceed 6% when the sandwich construction＇s modulus is over 100 MPa. Based on the study of the current test system parame- ters, an improved press-shear method was put forward： reducing the bending deflection of the loading plate＇s loading end by improving the loading method. This new test method covers the determination of the shear modulus of sandwich construction whose shear modulus is lower than 500 MPa , with a test error less than 30%. The improved test method also reduces the sensitivity of test results to fixture dimension parameters variations, and improves the test reliability.

关 键 词：X—cor夹层 剪切模量 试验方法 有限元法 

分 类 号：TB332[一般工业技术—材料科学与工程]