摘要：对国内外主要几个胶粘剂单搭接拉伸剪切强度试验方法(金属对金属)标准进行了对比,并总结了各标准之间的相似和差异。发现随着加载速度和被粘试片厚度的增加,胶粘剂强度和试样拉伸模量都会有所提高,但数据的标准偏差会有所增加。随着试样长度及搭接长度的增加,试样的拉伸剪切强度会有较大提高.但拉伸模量会降低很多,数据的平行性会有所改善。对同一种产品进行研究或检验时,应选用更符合产品设计的相应标准并始终采用同一标准进行测试。

摘要：对设计的拉伸剪切试样和原位拉伸剪切试样分别进行不同剪应变率下的拉伸剪切试验及原位拉伸剪切试验,研究6061铝合金在剪力状态下的力学性能及断裂行为,并用有限元软件ABAQUS对铝合金在剪应力状态下的断裂行为进行模拟。结果表明:随着剪应变率的增大,6061铝合金的剪切屈服强度和抗剪强度基本保持不变,但剪切断裂应变明显减小;剪应变率对试样的断口形貌没有影响;6061铝合金晶界是其最薄弱环节,在拉伸剪切过程中铝合金试样表面上产生了大量与拉伸方向平行的滑移带;微裂纹在剪应力作用下形核于与拉伸方向平行的滑移带和晶界,随着剪应力的增加,微裂纹长大和扩展;微裂纹之间通过剪切而连接导致试样断裂;6061铝合金剪切断裂行为可以用Johnson-Cook模型进行描述。

摘要：高等级的新型高强度TWIP(李晶诱导塑性钢)钢,只有经过适当的焊接装配,才能广泛用于汽车制造业。因此,本文将研究主要工艺参数对电阻点焊TWIP钢力学性能和显微组织特性的影响。采用的焊接参数包括焊接电流、夹持力和焊接时间。使用L-9(33)正交矩阵设计试验。通过拉伸剪切试验,并检测维氏显微硬度来确定焊接接头的力学响应性能。文中还研究了焊接参数对拉伸剪切试样断裂形式的影响。

摘要：At present,the methods of analyzing the stability of slope under earthquake are not accurate and reasonable because of some limitations. Based on the real dynamic tensile-shear failure mechanism of slope,the paper proposes dynamic analysis of strength reduction FEM (finite element method) and takes the reduction of shear strength parameters and tensile strength parameters into consideration. And it comprehensively takes the transfixion of the failure surface,the non-convergence of calculation and mutation of displacement as the criterion of dynamic instability and failure of the slope. The strength reduction factor under limit state is regarded as the dynamic safety factor of the slope under earthquake effect and its advantages are introduced. Finally,the method is applied in the seismic design of anchors supporting and anti-slide pile supporting of the slope. Calculation examples show that the application of dynamic analysis of strength reduction is feasible in the seismic design of slope engineering,which can consider dynamic interaction of supporting structure and rock-soil mass. Owing to its preciseness and great advantages,it is a new method in the seismic design of slope supporting.