Failure of uniformly compression loaded debond damaged sandwich panels — An experimental and numerical study
Failure of uniformly compression loaded debond damaged sandwich panels — An experimental and numerical study
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均匀压缩负载脱粘损坏夹芯板的失效——实验和数值研究
DOI：
10.1177/1099636212443913
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
B. Hayman
中科院分区：
文献类型：
--
作者：
R. Moslemian;A. Quispitupa;C. Berggreen;B. Hayman
本文研究了植入圆形面心脱粘的受压夹层板的破坏问题。对具有三种不同芯材(H130、H250和PMI)的完整夹芯板和具有三种不同直径的圆形面/芯骨的类似板进行了均匀压缩试验。采用数字图像相关技术对板材表面应变和离面位移进行了监测。进行了复合型弯曲试验，以确定面板表面/芯部界面的断裂韧性。采用有限元分析和线弹性断裂力学方法确定了壁板的临界屈曲载荷和抗压强度。讨论了建模方法和失效准则。在大多数情况下，数值计算的裂纹扩展载荷与实验结果吻合较好，但在少数情况下，数值计算结果与实验结果之间的偏差高达45%。这可以归因于几个因素，如测量的界面断裂韧性的大离散性，不同的裂纹尖端细节和复合型弯曲试件之间的裂纹扩展机制。本文给出了试探性的强度折减曲线，但需要消除有关所用材料的完整强度的不确定性，然后才能放心地使用这些曲线。
This paper deals with the failure of compression-loaded sandwich panels with an implanted circular face/core debond. Uniform compression tests were conducted on intact sandwich panels with three different types of core material (H130, H250 and PMI) and on similar panels with circular face/core debonds having three different diameters. The strains and out-of-plane displacements of the panel surface were monitored using the digital image correlation technique. Mixed mode bending tests were conducted to determine the fracture toughness of the face/core interface of the panels. Finite element analysis and linear elastic fracture mechanics were employed to determine the critical buckling load and compression strength of the panels. Modeling approaches and failure criteria are discussed. Numerically determined crack propagation loads in most of the cases show a fair agreement with experimental results, but in a few cases up to 45% deviation is seen between numerical and experimental results. This can be ascribed to several factors such as the large scatter in the measured interface fracture toughness, differing crack tip details and crack growth mechanisms between the panels and the mixed mode bending specimens. Tentative strength reduction curves are presented, but uncertainty concerning the intact strengths of the materials used needs to be removed before these can be utilized with confidence.