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首页> 外文会议>International Conference on Mechanical Engineering and Mechanics vol.1; 20051026-28; Nanjing(CN) >Study on the Shear-compression Stresses of Stitched Foam-core Sandwich
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Study on the Shear-compression Stresses of Stitched Foam-core Sandwich

机译：缝合泡沫芯夹心板的剪切压缩应力研究

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摘要

Stitched foam-core sandwich is a low-cost structure panels with carbon fiber face sheets, a closed-cell foam core, and through-the-thickness Kevlar stitching. Through-the thickness stitching is proposed to increase the interlaminar strength and damage tolerance of composite sandwich structures. For the purpose of obtaining the failure mechanism of the new material, a finite-element modeling was used to study the core stress distribution of stitched foam core sandwich under four-point flexural loading. The model results show that the shear stress distributing was not the same as unstitched foam core sandwich due to the existence of the stitches. An experimental method for common sandwich structures was introduced to test the stitched foam core sandwich, and the analysis indicates that the method can ensure a more homogeneous shear stress field. Using this method, controlled combinations of shear and compressive stress can be generated within the stitched foam core, allowing evaluation of the shear-compression failure envelope with different given failure criteria for foam-core and stitches.
机译：缝合的泡沫芯三明治是一种低成本的结构面板，带有碳纤维面板，闭孔泡沫芯和超厚的凯夫拉针迹。提出通过厚度拼接来增加层间强度和复合夹层结构的损伤容限。为了获得新材料的破坏机理，采用有限元模型研究了四点弯曲载荷下缝合泡沫夹芯夹心的核心应力分布。模型结果表明，由于缝线的存在，剪切应力的分布与未缝线的泡沫芯夹心不同。介绍了一种普通夹层结构的试验方法，对缝合的泡沫芯夹心进行了测试，分析表明该方法可以保证更均匀的切应力场。使用这种方法，可以在缝合的泡沫芯中生成剪切应力和压缩应力的受控组合，从而可以评估泡沫压缩芯和针迹具有不同的给定破坏准则的剪切压缩破坏包络线。

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