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Assessment of thermo-oxidative induced chemical strain by inverse analysis of shrinkage profiles in unidirectional composites

机译:通过单向复合材料收缩曲线反分析评估热氧化诱导的化学应变

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The present paper focuses on the assessment of thermo-oxidative induced chemical strain in HTS/TACTIX carbon/epoxy Organic Matrix Composites for High Temperature Applications, by inverse analysis of shrinkage profiles in unidirectional composites. First, measurement of matrix shrinkage in composites surface is carried out by Interferometric Microscopy for virgin samples (initial state) and for samples aged under oxygen pressure and air at atmospheric pressure: then, a model based on thermodynamics with Internal Variables and ABAQUS numerical simulations carried out on unidirectional composite realistic samples are employed for inverse identification of thermo-oxidative induced chemical strain and its evolution during conditioning. The identification is performed successfully and validated against chemical shrinkage profiles developing in pure resin systems. The model is then used for calculating thermo-oxidative induced stresses related to chemical shrinkage inelastic strains and for the prediction of the observed fibre/matrix debonding scenario. A Rayleigh-Ritz method is also developed for rapid prediction of matrix shrinkage in composite materials. (C) 2016 Elsevier Ltd. All rights reserved.
机译:本文通过对单向复合材料中的收缩曲线进行反分析,重点评估了高温应用的HTS / TACTIX碳/环氧树脂有机基复合材料中热氧化诱导的化学应变。首先,对于原始样品(初始状态)以及在氧气压力和空气中处于大气压力下老化的样品,通过干涉显微镜进行了复合材料表面基质收缩的测量:然后,进行了基于热力学的模型,该模型具有内部变量和ABAQUS数值模拟单向复合现实样本被用于热氧化诱导的化学应变及其在调节过程中的演变的逆向识别。可以成功进行识别,并针对纯树脂系统中产生的化学收缩曲线进行验证。然后将该模型用于计算与化学收缩非弹性应变有关的热氧化诱导应力,并用于预测观察到的纤维/基体脱粘情况。还开发了Rayleigh-Ritz方法来快速预测复合材料中的基体收缩率。 (C)2016 Elsevier Ltd.保留所有权利。

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