Numerically assisted calibration procedure of nonlinear in-plane shear properties of unidirectional composite laminae based on off-axis tensile experiments

IF 2.3 3区 材料科学 Q3 MATERIALS SCIENCE, COMPOSITES Journal of Composite Materials Pub Date : 2024-03-25 DOI:10.1177/00219983241241771
László Kovács, Gábor Romhány
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Abstract

In this paper, a novel methodology is presented to evaluate the true nonlinear shear response of continuous fiber-reinforced plastic (CFRP) unidirectional laminae. It requires simple off-axis tensile experiments to be conducted and a finite element (FE) representation of them with a material constitutive law capable of handling nonlinearity in shear. Upon successful evaluation of the normal stiffness properties, the shear stress-strain response is derived via numerical calibration of the underlying FE models. The presented approach is also demonstrated by processing the raw data of an extensive material characterization test campaign conducted on a thermoplastic matrix CFRP. The outcome is compared to the conventional methods for shear response derivation using relevant standards such as ASTM D3518 and ASTM D5379. It has been successfully demonstrated that the pseudo-hardening phenomenon obtained from standard shear experiments as a result of fibers aligning with load direction can be eliminated with off-axis specimen tension experiments, thus, the true shear stress versus deformation response can be extracted up to failure. The main purpose of current work is to demonstrate the inconsistency in the available standard methods related to mechanical testing-based derivation of nonlinear in-plane shear behavior of UD plies. In addition, a novel technique is presented to achieve a more accurate prediction of nonlinear shear stress and strain along the entire representative loading range that contributes to more accurate simulations of composite parts up to failure and thus, better strength predictions.
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基于离轴拉伸实验的单向复合材料层板非线性面内剪切特性数值辅助校准程序
本文介绍了一种新型方法,用于评估连续纤维增强塑料(CFRP)单向层压板的真实非线性剪切响应。该方法要求进行简单的离轴拉伸实验,并用能处理剪切非线性的材料构成定律对其进行有限元(FE)表示。在成功评估法向刚度特性后,通过对基础有限元模型进行数值校准,即可得出剪切应力-应变响应。该方法还通过处理对热塑性基体 CFRP 进行的广泛材料特性测试活动的原始数据进行了演示。试验结果与使用 ASTM D3518 和 ASTM D5379 等相关标准推导剪切响应的传统方法进行了比较。实验成功证明,离轴试样拉伸实验可消除标准剪切实验中因纤维与载荷方向一致而产生的假硬化现象,从而提取出直至破坏的真实剪切应力与变形响应。当前工作的主要目的是证明与基于机械测试的 UD 层非线性面内剪切行为推导相关的现有标准方法的不一致性。此外,还介绍了一种新技术,可以更准确地预测整个代表性加载范围内的非线性剪切应力和应变,有助于更准确地模拟复合材料部件的失效,从而更好地预测强度。
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来源期刊
Journal of Composite Materials
Journal of Composite Materials 工程技术-材料科学:复合
CiteScore
5.40
自引率
6.90%
发文量
274
审稿时长
6.8 months
期刊介绍: Consistently ranked in the top 10 of the Thomson Scientific JCR, the Journal of Composite Materials publishes peer reviewed, original research papers from internationally renowned composite materials specialists from industry, universities and research organizations, featuring new advances in materials, processing, design, analysis, testing, performance and applications. This journal is a member of the Committee on Publication Ethics (COPE).
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