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首页> 外文会议>International Conference on Composite Materials >SPECIMEN CLAMPING AND PERFORMANCE OF THE IOSIPESCU SHEAR TESTS APPLIED FOR COMPOSITE MATERIALS
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SPECIMEN CLAMPING AND PERFORMANCE OF THE IOSIPESCU SHEAR TESTS APPLIED FOR COMPOSITE MATERIALS

机译：施用复合材料的IOSIPESCU剪切试验试样钳位和性能

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摘要

Clamping and subsequent loading in shear of Ioispescu specimens is investigated. Combined stresses reach similar, or even higher, levels locally compared the nominal shear stress, both compressive and tensile. Especially for brittle materials, composites, and materials with anisotropic failure modes, these stresses may cause premature failure outside the test region and appropriate clamping levels become important. A clamping ratio (r) between clamping force and peak shear force is introduced, and it is shown that for quasi-isotropic failure modes, the overall lowest detrimental stresses are obtained for about r ～1. It is further shown that loss of contact always occurs in one part of the clamping region unless r is in excess of 2.5-3. Near that loss of contact, high tensile stresses are obtained. Even with moderate r, there will be local plasticity or crushing etc due to high contact pressure near the end of the opposing gripping face. These findings are shown both numerically and experimentally using optical full field strain measurements.
机译：研究了IOISpescu标本剪切夹紧和随后的载荷。组合应力达到相似，甚至更高，局部局部比较标称剪切应力，包括压缩和拉伸。特别是对于具有各向异性衰竭模式的脆性材料，复合材料和材料，这些应力可能导致测试区域以外的过早失效，并且适当的夹紧水平变得重要。介绍夹紧力和峰值剪切力之间的夹紧比（R），并且显示用于准各向同性衰竭模式，得到总体最低的有害应力，用于约R〜1。进一步表明，除非R超过2.5-3，否则夹紧区域的一部分始终发生接触丢失。靠近接触损失，获得高拉伸应力。即使具有中等R，由于相对抓握面的端部附近的高接触压力，也会存在局部可塑性或破碎等。这些发现在数值和实验中示出了使用光学全场应变测量。

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