"Segment-wise model" for theoretical simulation of barely visible indentation damage in composite sandwich beams: Part I - Formulation
"Segment-wise model" for theoretical simulation of barely visible indentation damage in composite sandwich beams: Part I - Formulation
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DOI：
10.1016/j.compositesa.2007.08.014
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发表时间：
2008-01-01
影响因子：
8.7
通讯作者：
Takeda, Nobuo
中科院分区：
文献类型：
--
作者：
Minakuchi, Shu;Okabe, Yoji;Takeda, Nobuo
当局部横向载荷作用在夹层结构上时，夹层局部变形，芯部破碎。由芯部挤压引起的残余凹陷显著地降低了夹层结构的机械性能。建立了复合材料面板蜂窝夹层梁静态压入加卸载响应的“分段模型”。该模型是通过修改一个理论开发的欧拉梁弹性温克勒基础。根据蜂窝的周期性形状将蜂窝夹层梁划分为多段，并在每段中综合考虑了芯材的复杂厚度方向行为。首先，通过单轴平面压缩-拉伸试验，测量了岩心在挤压-拉伸过程中的压缩应力-应变曲线。采用近似为一组直线的厚度方向特性，对铝蜂窝夹层梁的二维压痕响应进行了理论模拟。通过实验验证了所得到的载荷-位移曲线，证实了新模型优于传统的弹塑性模型。进一步的实验验证和讨论在本研究的第二部分。(c)2007爱思唯尔有限公司版权所有。
When localized transverse loading is applied to a sandwich structure, the facesheet locally deflects and the core crushes. A residual dent induced by the core crushing significantly degrades the mechanical properties of the sandwich structure. The authors establish a "segment-wise model" for theoretical simulation of static indentation loading and unloading responses in honeycomb sandwich beams with composite facesheets. The model was developed by modifying a theory developed for an Euler beam on an elastic Winkler foundation. The honeycomb sandwich beam was divided into many segments based on the periodic shape of the honeycomb, and the complicated through-thickness behavior of the core was integrated into each segment. First, compressive stress-strain curves were measured during the crushing-stretching process of the core using uniaxial flatwise compressive- tensile tests. Using the through-thickness properties approximated as a set of lines, the 2D indentation response in an aluminum honeycomb sandwich beam was then theoretically simulated. The obtained load-displacement curve was validated by an experiment, confirming the superiority of the new model over a conventional elastic- perfectly plastic model. Further experiment verification and a discussion are presented in Part II of this study. (c) 2007 Elsevier Ltd. All rights reserved.