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Elastic stability in biaxial testing with cruciform specimens subjected to compressive loading

机译：十字形试样在压缩载荷下双轴测试的弹性稳定性

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摘要

This work presents the main aspects that should be taken into account to design biaxial experiments with cruciform specimens in the presence of compressive loading, applied on the arms of the sample by means of compression plates. The global buckling of the cruciform specimen and the local instability of the rectangular-shaped central region submitted to biaxial loading are described numerically and analytically. The analytical expressions are derived using the buckling effective lengths technique for calculating the bifurcation stress in simply supported and clamped rectangular thin-plates made of isotropic materials and +/- 45 degrees angle-ply CFRP laminates. Furthermore, the influence of the arms-to-centre thickness-ratio on the compressive load that destabilises the cruciform geometry is reviewed numerically. Finally, the use of an anti-buckling device is numerically proved to reduce the risk of instabilities and to assure more reliable results. The device consists of a cross-shaped fixture that constrains the out-of-plane displacements and an optional L-shaped support in order to force the alignment of the fixture, the sample and the testing machine.
机译：这项工作提出了在有压缩载荷的情况下设计十字形试样的双轴实验时应考虑的主要方面，这些试样通过压缩板施加在样品的臂上。数值和分析地描述了十字形试样的整体屈曲和矩形中心区域承受双轴载荷的局部不稳定性。使用屈曲有效长度技术推导解析表达式，以计算由各向同性材料和+/- 45度角层CFRP层压板制成的简单支撑和夹紧的矩形薄板中的分叉应力。此外，数值分析了臂中心厚度比对破坏十字形几何形状的压缩载荷的影响。最终，在数值上证明了使用抗屈曲装置可以减少不稳定的风险并确保获得更可靠的结果。该设备包括一个限制平面外位移的十字形夹具和一个可选的L形支撑，以迫使夹具，样品和测试机对准。

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