波纹度
材料科学
复合材料
热固性聚合物
极限抗拉强度
拉伸试验
平纹织物
有限元法
滑脱
环氧树脂
纤维
刚度
模数
压力(语言学)
纱线
结构工程
语言学
哲学
工程类
作者
Mina Derakhshani Dastjerdi,M. Carboni,Mehdi Hojjati
标识
DOI:10.20944/preprints202306.1864.v1
摘要
In this paper, the tensile behavior of unidirectional carbon/epoxy prepreg is experimentally analyzed at varying loads and temperatures, focusing on the considerable nonlinearity at the beginning of the stress-strain curve. The high viscosity of this material presented difficulties in securely holding specimens during tensile testing. As a result, modifications were made to the conventional gripping method to enable the acquisition of reliable test data. Additionally, a longer gauge length was chosen to minimize the impact of slippage on the elastic modulus measurement. To support the experiment, a micromechanical model of a prepreg tow with fiber waviness is proposed. An RVE model of periodically distributed unidirectional waved cylindrical fibers embedded within the matrix is developed to predict the effective material stiffness parameters. Numerical results are presented for different amplitude-to-wavelength ratios which indicate the fiber waviness reduces the tensile modulus of the composite. The simulation results are in good agreement with the uniaxial tensile test of the prepreg tow.
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