缺陷对纤维金属层板低速冲击性能影响规律

Influence of flaw on the low-velocity impact resistance performance of glass fiber reinforced aluminum laminates(GLARE)

为研究不同孔洞大小和位置的玻璃纤维铝合金层板抗冲击性能损伤规律,本文通过在Abaqus中建立落锤低速冲击有限元模型,分析了玻璃纤维铝合金层板受冲击后的接触力、能量吸收、试件变形的响应规律。该模型中用自定义子程序VUMAT、Johnson-Cook金属损伤模型以及基于接触行为的表面内聚力行为分别可以用于分析复合材料、铝合金层和层间分层行为。在20 J冲击能量下,对比分析了圆孔大小和圆孔位置对玻璃纤维铝合金层板材料的冲击响应和破坏规律。结果表明:固定半径2 mm,圆孔距离玻璃纤维铝合金层板中心处较近的试件铝合金层板损伤、层间损伤、复合材料板损伤范围大,且集中于圆孔内侧;固定圆孔距离冲击中心为6 mm,随孔径增大,试件的各类损伤集中于缺陷周围。因此,缺陷会明显降低玻璃纤维铝合金层板的抗冲击性能。

In order to investigate the impact resistant performance of glass-fiber reinforced aluminum(GLARE)that is drilled with circular holes of different size and location,a finite element model(FEM)was developed in Abaqus in order to analyze the history of responses consisting of contacted force,absorbed energy,and deflection.Moreover,the user material subroutine—vectorized user material routine(VUMAT),Johnson-Cook metal damage model,and surface based cohesive contact behavior were included in this FEM in order to simulate the damage behaviors of composite laminates,aluminum layers,and the interface delamination,respectively.Using an incident energy of 20 J,the impact response and damage law of circular hole′s size and position on GLARE was compared and analyzed.The results indicated that for the specimen with a fixed radius of 2 mm and a circular hole near the center of the glass fiber aluminum alloy laminate,the damage ranges of aluminum alloy laminate,interlayer damage,and composite material laminate were large and concentrated on the inner side of the circular hole.The distance between the fixed circular hole and the impact center was 6 mm.By increasing the hole diameter,all kinds of damages of the specimen were concentrated around the defect.Therefore,it is suggested that the flaw could reduce the impact performance of GLARE.