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Effect of off-axial angle on the low-velocity impact performance of braided laminates
International Journal of Mechanical Sciences ( IF 7.3 ) Pub Date : 2021-12-03 , DOI: 10.1016/j.ijmecsci.2021.106967
Zhenyu Wu 1 , Lingmin Huang 1 , Zhongxiang Pan 1 , Baoming Zhang 2 , Xudong Hu 1
Affiliation  

The sensitivity of off-axial angle on impact response was investigated by experimental and numerical methods in this work. Three types of braided laminates with different on/off-axial angles in terms of OA00, OA225 and OA45 were prepared and low-velocity impact tests with various energy levels were performed. Meso-level finite element model (FEM) was also developed to reveal impact damage initiation and development. We discovered that the boundary condition of primary load-bearing yarns depending on the off-axial angles caused the difference of structural deformation and stress distribution of braiding yarns during impact process. Due to the restriction of the pressurized tips, the straightening effect of primary load-bearing yarns with heavy waviness caused its out-of-plane movement and related main cracks in OA00 specimen. In addition, the matrix resin cracks were found at the edge of the specimen because of in-plane shear movement of braiding yarns. As for OA45 specimen, more evident bending deformation was observed, resulting in elevated tensile stress of braiding yarns on non-impact side. The variation of off-axial angle from 0 to 45 degree led to the failure mode transforming from the extensive matrix damage on specimen edge to the severe fiber breakage on non-impact side. As a medium off-axial angle, OA225 specimen exhibited a mixture failure mode to resist impact and achieved excellent performance with respect to higher peak force and delayed load dropping.



中文翻译:

偏轴角对编织层板低速冲击性能的影响

在这项工作中,通过实验和数值方法研究了离轴角对冲击响应的敏感性。制备了 OA00、OA225 和 OA45 三种不同轴向/离轴角度的编织层压板,并进行了不同能级的低速冲击试验。还开发了细观级有限元模型 (FEM) 以揭示冲击损伤的发生和发展。我们发现主要承重纱线的边界条件取决于离轴角度导致编织纱线在冲击过程中的结构变形和应力分布的差异。由于加压尖端的限制,具有大波纹的初级承重纱线的矫直作用导致其平面外运动和 OA00 试样中相关的主要裂纹。此外,由于编织纱线的面内剪切运动,在试样边缘发现基体树脂裂纹。至于OA45标本,更明显观察到弯曲变形,导致非冲击侧编织纱线的拉伸应力升高。离轴角从 0 度到 45 度的变化导致失效模式从试样边缘的广泛基体损伤转变为非冲击侧的严重纤维断裂。作为中等偏轴角,OA225 试样表现出抗冲击的混合破坏模式,并在更高的峰值力和延迟负载下降方面取得了优异的性能。

更新日期:2021-12-08
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