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本文介绍了一种基于电子万能试验机开发的新型压杆稳定实验装置。该装置利用电子万能试验机自身传感设备,通过测量压杆两端受力与绘制端部轴向位移曲线来确定压杆失稳荷载。装置包括上、中、下三个约束部分与压杆试样部分,可实现两端固支、两端铰支、一端固支一端铰支和一端固支一端自由等4种不同端部约束型式,并且能够施加中部固支约束与压杆初始偏心。本文同时讨论了两种铰支型式,即刀刃铰支与轴承铰支对测试精度的影响。实验表明,轴承铰支测量精度比刀刃铰支高。该套装置的整体测量精度高,与理论值的相对误差最高为2%。 相似文献
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IntroductionInordertodeveloptheapparelCADsystemthebucklingofwovenfabrichasreceivedmuchattentioninrecentyears[1,2 ].Thefabricsheethasalwaysbeenregardedaselasticthinplateinthefabricmechanics,however,therearesomepeculiarbucklingphenomenawecanseeinthefabricb… 相似文献
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Phase transformation from austenite to martensite in NiTi alloy strips under the uniaxial tension has been observed in experiments and numerically simulated as a localized deformation.This work presents an analysis using the theory of phase transfor- mation.The jump of deformation gradient across the interface between two phases and the Maxwell relation are considered.Governing equations for the phase transformation are derived.The analysis is reduced to finding the minimum value of the loading at which the governing equations have a unique,real and physically acceptable solution.The equa- tions are solved numerically and it is verified that the unique solution exists definitely. The Maxwell stress,the stresses and strains inside both anstenite and martensite phases, and the transformation-front orientation angle are determined to be in reasonably good agreement with experimental observations. 相似文献
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加载速率对6020铝合金材料力学性能影响的实验研究 总被引:1,自引:0,他引:1
通过拉伸实验研究了加载速率在1mm/min, 10mm/min, 100mm/min以及200mm/min范围内6020铝合金材料的力学性质,结果表明这种材料有近似于理想弹塑性的性质,应力-应变曲线明显地表现为线弹性和线塑性的特点,而且加载速率对于该铝合金材料的力学性质没有明显的影响.作为对比还测试了45#中碳钢在相同的加载速率条件下的力学特性,得出随着加载速率的增加,无论屈服强度还是抗拉强度均有一定的提高,塑性有了一定的降低.最后,根据实验结果确定了该铝合金材料的本构关系. 相似文献
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The typical micro-knitting structure of knitted fabric, which makes it very different from woven fabric, is described. The
tensile tests of knitted fabric are reported. The deformations of the micro-knitting structures are carefully studied. The
study indicates that when a knitted fabric sheet is subjected to a tension along w-direction an extra compressive stress field
inside loop in c-direction is induced. The extra stress field is also determined through analysis. Finally, a micro-mechanical
model of knitted fabric is proposed. This work paves the way for the simulations of buckling modes of a knitted fabric sheet
as are observed in experiments.
The project supported by the National Natural Science Foundation of China (10272079) 相似文献
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