A novel FFT-based computational framework for coupling non-local elastic-plastic damage model is proposed in this paper, which is employed to accurately simulate the transverse tensile behaviors of unidirectional (UD) CF/PEEK composite materials under different temperatures. To address the distinct material properties exhibited by different microscopic constituents within the composite, two approaches are employed: (i) an integral-type regularized traction-separation damage model is applied to the interphase debonding, and (ii) an implicit gradient regularization technique for Lemaitre-type damage (matrix cracking) of the PEEK. By coupling the non-local damage model capable of accurately characterizing different failure modes within composites with an FFT computational framework, accurate predictions of the transverse tensile performance of UD-CF/PEEK composites at different temperature conditions can be achieved. Furthermore, the influence of non-local feature parameters and interphase mechanical properties on the composite's mechanical behavior is thoroughly discussed. Comparisons with experimental results affirm the accurate prediction of the transverse tensile behavior of UD-CF/PEEK composites through the proposed computational framework. Ultimately, based on this framework, the transverse tensile modulus and strength of UD-CF/PEEK composites, considering different fiber volume fractions and temperatures, are predicted, successfully demonstrating the effectiveness and applicability of the proposed approach in forecasting the mechanical behavior of composites.

中文翻译：

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一种具有耦合非局部弹塑性损伤模型的新型 FFT 框架，用于 UD-CF/PEEK 复合材料的热机械失效分析

本文提出了一种基于 FFT 的新型耦合非局部弹塑性损伤模型的计算框架，用于精确模拟单向（UD）CF/PEEK 复合材料在不同温度下的横向拉伸行为。为了解决复合材料中不同微观成分表现出的不同材料特性，采用了两种方法：（i）将积分型正则化牵引分离损伤模型应用于相间脱粘，以及（ii）隐式梯度正则化技术PEEK 的勒梅特型损伤（基体裂纹）。通过将能够准确表征复合材料内不同失效模式的非局部损伤模型与 FFT 计算框架相结合，可以准确预测 UD-CF/PEEK 复合材料在不同温度条件下的横向拉伸性能。此外，还深入讨论了非局部特征参数和相间力学性能对复合材料力学行为的影响。与实验结果的比较证实了通过所提出的计算框架对 UD-CF/PEEK 复合材料横向拉伸行为的准确预测。最终，基于该框架，考虑不同纤维体积分数和温度，预测了UD-CF/PEEK复合材料的横向拉伸模量和强度，成功证明了该方法在预测复合材料力学行为方面的有效性和适用性。