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Study on cure-induced residual stresses and spring-in deformation of L-shaped composite laminates using a simplified constitutive model considering stress relaxation

机译：考虑压力松弛的简化本构模型，Cure诱导的残余应力和L形复合层压板的弹簧变形

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In this paper, a simplified constitutive model of resin in curing process considering stress relaxation was proposed. The simulation of composite curing using the proposed model is accurate as the simulation using viscoelastic model, but the computing efficiency is greatly improved. The proposed model balances the simulation accuracy and efficiency, which is urgently needed in practice. Then it was utilized to predict the spring-in deformations of L-shaped composite laminates with different structural parameters. The results were in good agreement with the corresponding experiments. A new interpretation of the generation mechanisms of residual stresses and spring-in deformation was presented based on the monitoring of changes of strains and stresses. The simulated results show that the residual stresses and spring-in deformation would be overestimated without considering stress relaxation. The quantitative discussions of the influence mechanisms of different structural parameters, including thickness, corner radius, corner angle and lay-up, were also presented.
机译：本文提出了一种考虑应力松弛的固化过程中树脂的简化组成型模型。使用粘弹性模型使用所提出的模型进行复合固化的仿真是准确的，但计算效率大大提高。建议的模型平衡了模拟精度和效率，迫切需要在实践中。然后利用它来预测具有不同结构参数的L形复合层压板的弹簧变形。结果与相应的实验一致。基于监测菌株和应力的变化，提出了对残余应力和弹簧变形的产生机制的新解释。模拟结果表明，在不考虑应力松弛的情况下，将超长残余应力和弹簧变形。还提出了不同结构参数的影响机制的定量讨论，包括厚度，角半径，角角和铺设。

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