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Meso-scale Modeling and Damage Analysis of Carbon/Epoxy Woven Fabric Composite under In-plane Tension and Compression Loadings
International Journal of Mechanical Sciences ( IF 7.1 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.ijmecsci.2020.105980 Guowei Zhou 1 , Qingping Sun 2 , Dayong Li 3 , Zhaoxu Meng 4 , Yinghong Peng 3 , Zhangxing Chen 5 , Danielle Zeng 6 , Xuming Su 6
International Journal of Mechanical Sciences ( IF 7.1 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.ijmecsci.2020.105980 Guowei Zhou 1 , Qingping Sun 2 , Dayong Li 3 , Zhaoxu Meng 4 , Yinghong Peng 3 , Zhangxing Chen 5 , Danielle Zeng 6 , Xuming Su 6
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The mechanical properties and damage behaviors of carbon/epoxy woven fabric composite under in-plane tension and compression are studied at the meso-scale level through experiment and simulation. An efficient representative volume element (RVE) modeling method with consistent mesh, high yarn volume fraction and realistic geometry is proposed. The material constitutive laws with plasticity, tension-compression asymmetry and damage evolution are established for the three components - yarn, matrix and interface, respectively. Significantly different mechanical properties and damage evolutions are observed depending on loading conditions and initial geometry characteristics. It shows a non-linear stress-strain curve with clear transition region and intensive damage in tension, while a quasi-linear behavior up to facture is observed in compression with little damage prior to final fracture. Moreover, compared to the constant Poisson's ratio with straining in compression, a dramatic increase in Poisson's ratio appears in tension. Simulation shows damage mechanisms including transverse damage, matrix damage and delamination, which all play critical roles in the property evolution. In particular, the rapid damage accumulation after elastic deformation destroys the strong bonds and causes the easy deformation of transverse yarns which results in the transition region and large Poisson's ratio in tension. All the mechanical behaviors and damage evolutions are well captured and explained with the current RVE model.
中文翻译：
面内拉伸和压缩载荷下碳/环氧织物复合材料的细观建模和损伤分析
通过实验和模拟，在细观尺度上研究了碳/环氧织物复合材料在面内拉伸和压缩下的力学性能和损伤行为。提出了一种具有一致网格、高纱线体积分数和真实几何形状的高效代表性体积元（RVE）建模方法。分别针对纱线、基体和界面这三个组成部分建立了具有塑性、拉压不对称性和损伤演化的材料本构定律。根据负载条件和初始几何特征，观察到显着不同的机械性能和损伤演变。它显示出非线性应力-应变曲线，具有清晰的过渡区域和拉伸损伤强烈，而在压缩中观察到直至断裂的准线性行为，在最终断裂之前几乎没有损伤。此外，与压缩应变下的恒定泊松比相比，张力下的泊松比出现显着增加。模拟显示了包括横向损伤、基体损伤和分层在内的损伤机制，这些机制在性能演变中都发挥着关键作用。特别是弹性变形后损伤的快速积累破坏了牢固的结合力，导致横向纱线容易变形，导致过渡区和张力泊松比较大。当前的 RVE 模型可以很好地捕捉和解释所有机械行为和损伤演变。
更新日期：2021-01-01
中文翻译：
面内拉伸和压缩载荷下碳/环氧织物复合材料的细观建模和损伤分析
通过实验和模拟，在细观尺度上研究了碳/环氧织物复合材料在面内拉伸和压缩下的力学性能和损伤行为。提出了一种具有一致网格、高纱线体积分数和真实几何形状的高效代表性体积元（RVE）建模方法。分别针对纱线、基体和界面这三个组成部分建立了具有塑性、拉压不对称性和损伤演化的材料本构定律。根据负载条件和初始几何特征，观察到显着不同的机械性能和损伤演变。它显示出非线性应力-应变曲线，具有清晰的过渡区域和拉伸损伤强烈，而在压缩中观察到直至断裂的准线性行为，在最终断裂之前几乎没有损伤。此外，与压缩应变下的恒定泊松比相比，张力下的泊松比出现显着增加。模拟显示了包括横向损伤、基体损伤和分层在内的损伤机制，这些机制在性能演变中都发挥着关键作用。特别是弹性变形后损伤的快速积累破坏了牢固的结合力，导致横向纱线容易变形，导致过渡区和张力泊松比较大。当前的 RVE 模型可以很好地捕捉和解释所有机械行为和损伤演变。
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