考虑单向预浸料弯曲性能的有限元仿真
Finite element modelling considering the bending behavior of uncured unidirectional prepregs
何靓 1赵安安 1徐小伟 1王小凯 1胡大豹 1梁彪2
作者信息
- 1. 中航西安飞机工业集团股份有限公司,西安 710089
- 2. 西北工业大学 机电工程学院,西安 710072
- 折叠
摘要
热固性树脂基预浸料沿纤维方向具有极高的拉伸模量和较小的弯曲刚度,准确描述预浸料的这种力学特性对于成型过程中褶皱等缺陷的预测与抑制、提升成型过程的有限元仿真精度具有重要意义.本文建立了基于纤维方向准确跟踪并考虑非线性剪切行为的单向预浸料本构模型,并通过共节点壳膜混合单元实现了预浸料高拉伸模量和低弯曲刚度的解耦.同时,以国产AC531/CCF800H单向预浸料为对象,系统测量了未固化预浸料的拉伸模量、剪切模量和弯曲刚度.最后,通过单向预浸料的偏轴拉伸试验和轴向压缩试验分别验证了本文所建立的有限元模型在膜单元和壳单元主导的受力条件下的有效性.
Abstract
Thermoset resin based prepregs exhibit very high tensile modulus and relatively low bending stiffness,and the accurate characterization of such special properties of prepregs is critical to predict and avoid the wrinkle defect during forming process,and improve the accuracy of finite element simulation of composite forming pro-cess.In the present paper,a finite element model that accurately tracks the fiber directions was built considering the nonlinear in-plane shear behavior of unidirectional prepregs,and the high tensile stiffness and significantly lower bending stiffness of the prepreg were decoupled using superimposed membrane-shell elements.Besides,the tensile stiffness,no-linear shear stiffness,and bending stiffness of the domestic prepreg system AC531/CCF800H were characterized experimentally.Finally,the 30° off-axis tensile test and axial compression test were used to prove the validity of the proposed model,respectively.
关键词
预浸料/拉弯解耦/壳膜混合/有限元法/弯曲刚度Key words
prepreg/decoupling the bending and tensile behaviors/superimposed shell and membrane elements/finite element modelling/bending stiffness引用本文复制引用
基金项目
国家重点研发计划(2021YFB3401700)
出版年
2024
NETL
NSTL
万方数据