摘要
为研究嵌入式共固化阻尼复合材料(ECDCM)的非线性静力学性能,对铺层角度为0°和45°的ECDCM试件进行拉伸实验和三点弯曲实验,基于复合材料连续损伤理论,在LS-DYNA中建立了ECDCM非线性有限元分析模型,将仿真结果与实验结果进行比较,验证了有限元模型的适用性;通过实验和仿真结果简单分析了ECDCM非线性静力学性能产生机制;使用有限元方法分别研究了不同铺层角度对ECDCM拉伸性能和弯曲性能的影响,并研究了阻尼层厚度对ECDCM弯曲弹性模量的影响。结果表明,ECDCM的材料非线性力学特性主要来源于拉伸时切应力分量导致基体不断产生剪切损伤,导致材料宏观力学性能发生变化;在0°至45°范围内随着铺层角度的增大,ECDCM材料非线性特征愈发显著,在0°~45°范围内,拉伸弹性模量和弯曲弹性模量随着铺层角度增大呈下降趋势,拉伸强度与弯曲强度随铺层角度增大也呈下降趋势;阻尼层的加入使得复合材料被隔断分为上下两部分,使得复合材料的弯曲弹性模量下降,并且在0~0.3 mm范围内阻尼层厚度增大会导致弯曲弹性模量进一步减小。
In order to study the nonlinear static properties of embedded Co-curing damping composite material(ECDCM),tensile experiments and three-point bending experiments were performed on ECDCM specimens with lay-up angles of 0° and 45°.Based on the continuous damage theory of composite materials,an ECDCM nonlinear finite element analysis model is established in LS-DYNA,and the simulation results are compared with the experimental results,which verifies the applicability of the finite element model.Through experimental and simulation results,the mechanism of nonlinear static properties of ECDCM is briefly analyzed.The effects of different ply angles on the tensile properties and flexural properties of ECDCM were studied by finite element method,and the influence of damping layer thickness on the bending modulus of ECDCM was studied.The results show that the nonlinear mechanical properties of ECDCM materials mainly come from the continuous shear damage of the matrix caused by the shear stress component during tension,resulting in changes in the macroscopic mechanical properties of the material.In the range of 0° to 45°,the nonlinear characteristics of ECDCM materials become more and more pronounced with the increase of ply angle,and in the range of 0° to 45°,the tensile modulus and bending modulus decrease with the increase of ply angle,and the tensile strength and bending strength also show a downward trend with the increase of ply angle.The addition of the damping layer makes the composite material divided into upper and lower parts,so that the bending modulus of the material decreases.And an increase in the thickness of the damping layer in the range of 0 mm to 0.3 mm leads to a further decrease in the bending modulus.
作者
罗皓
梁森
孙瑞骏
刘昭阳
Luo Hao;Liang Sen;Sun Ruijun;Liu Zhaoyang(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520,China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2023年第11期108-114,共7页
Engineering Plastics Application
基金
国家自然科学基金面上项目(52075280)
山东省自然科学基金项目(ZR2019MEE088)。
