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The effects of unequal compressive/tensile moduli of composites

机译：复合材料不平等的压缩/拉伸模量的影响

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This paper investigates the effects of unequal compressive and tensile moduli of carbon fibre reinforced plastic (CFRP) composites. The basic assumption is based on the statistics that the compressive modulus is a fraction lower than the tensile modulus. Data evaluated by Finite Element Analysis (FEA) model, Classical Laminate Theory (CLT) model, and experiment are used to investigate these effects. The terms of compressive modulus are successfully introduced into the Tsai-Wu failure criterion for the production of failure envelops, into the Classical Beam Theory (CBT) and CLT for the investigation of flexural behaviour as well as the fibre microbuclding model for the analysis of compressive failure. The study shows that the failure criteria shift from stress domain to strain domain when the compressive modulus is considered, and the strain dominated failure criteria could generally provide more accurate prediction in composite material. Therefore it is proposed to apply strain dominated failure criteria for composite design, testing and certificate. (C) 2015 Elsevier Ltd. All rights reserved.
机译：本文研究了碳纤维增强塑料（CFRP）复合材料的不平等压缩模量和拉伸模量的影响。基本假设基于统计数据，即压缩模量比拉伸模量小。通过有限元分析（FEA）模型，经典层压理论（CLT）模型和实验评估的数据用于研究这些影响。压缩模量的术语已成功引入用于产生破坏包络的Tsai-Wu破坏准则，经典梁理论（CBT）和CLT用于弯曲行为的研究以及纤维微泡模型用于分析压缩失败。研究表明，当考虑压缩模量时，破坏准则从应力域转移到应变域，而应变为主的破坏准则通常可以为复合材料提供更准确的预测。因此，建议将应变主导的破坏准则应用于复合材料的设计，测试和认证。 （C）2015 Elsevier Ltd.保留所有权利。

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