Failure initiation and progression of sandwich beams under cyclic bending tests

IF 3.5 3区 材料科学 Q1 ENGINEERING, MECHANICAL
Raja Ouled Ahmed Ben Ali, Dorra Ben Abdeljelil, S. Chatti
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引用次数: 0

Abstract

This study presents experimental results and analysis of failure of sandwich beams with steel face sheets and polyurethane core tested in three-point bending. Firstly, a series of experiences are conducted in order to obtain the mechanical properties of the metallic face sheets and the foam core. To model the foam behavior, quasi-cyclic tests were performed by increasing the punch stroke. An exponential model is proposed describing the variation of the elastic modulus as a function of the strain. Secondly, the quasi-static and quasi-cyclic bending tests are carried out leading to failure of the sandwich beam. The results of the quasi-cyclic bending show that the behavior of the sandwich beam is similar to the foam behavior in quasi-cyclic compression. Thirdly, a Finite Element Analysis (FEA) is performed in order to predict the observed foam fracture in bending test using a shear damage criterion for the foam core. The comparisons show a satisfactory agreement between the experimental results and the FEA predictions.
循环弯曲试验下夹层梁的失效起始与发展
本文介绍了三点弯曲试验中钢面板和聚氨酯芯夹层梁的试验结果和失效分析。首先,为了获得金属面板和泡沫芯的力学性能,进行了一系列的实验。为了模拟泡沫行为,通过增加冲压行程进行了准循环试验。提出了一个指数模型,将弹性模量的变化描述为应变的函数。其次,进行了准静态和准循环弯曲试验,导致夹层梁失效。准循环弯曲试验结果表明,夹层梁在准循环压缩中的行为与泡沫相似。第三,使用泡沫芯的剪切损伤准则,进行有限元分析(FEA),以预测弯曲试验中观察到的泡沫破裂。比较表明,实验结果与有限元分析预测结果吻合良好。
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来源期刊
Journal of Sandwich Structures & Materials
Journal of Sandwich Structures & Materials 工程技术-材料科学:表征与测试
CiteScore
9.60
自引率
2.60%
发文量
49
审稿时长
7 months
期刊介绍: The Journal of Sandwich Structures and Materials is an international peer reviewed journal that provides a means of communication to fellow engineers and scientists by providing an archival record of developments in the science, technology, and professional practices of sandwich construction throughout the world. This journal is a member of the Committee on Publication Ethics (COPE).
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