A micromechanics based model for rate dependent compression loaded unidirectional composites

作     者：Singh, Vivekendra Larsson, Ragnar Olsson, Robin Marklund, Erik 

作者机构：RISE AB Div Mat & Prod SE-43122 Molndal Sweden Chalmers Univ Technol Dept Ind & Mat Sci Div Mat & Computat Mech SE-41296 Gothenburg Sweden 

出 版 物：《COMPOSITES SCIENCE AND TECHNOLOGY》 (复合材料科学与技术)

年 卷 期：2023年第232卷

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Swedish Foundation for Strategic Research (SSF) [FID16-0041] RISE internal development funds, Sweden [P108811, P113521] ICONIC project under the Marie Sklodowska-Curie, Sweden Swedish Foundation for Strategic Research (SSF) [FID16-0041] Funding Source: Swedish Foundation for Strategic Research (SSF) 

主　　题：Viscoelasticity-viscoplasticity C Damage mechanics Material modelling B Non-linear behaviour A Structural composites 

摘      要：Strain-rate effects in a unidirectional non-crimp fabric carbon/epoxy composite are addressed. To allow for kink-band formation including strain-rate effects and damage in such composites, the paper advances a recent model focused on compression loading at small off-axis angles. The model is based on computational homogenization with a subscale represented by matrix and fibre constituents at finite deformation. The fibre constituent is assumed to be elastic transversely isotropic and the matrix is viscoelastic-viscoplastic with damage degradation. Novel model improvements of special importance to small off-axis loading relate to the isostress formulation of the homogenized response in transverse shear. In this context, an enhanced homogenized elastic response is proposed based on Halpin-Tsai corrections to account for the nonuniform stress distribution on the microscale. The model captures the strongly rate sensitive kink-band formation due to localized matrix shearing and fibre rotation, confirming the experimentally observed increase in compressive strength for high strain rates.