复合材料加筋板冲击后损伤容限研究

Study on the Post-impact Damage Tolerance of Composite Stiffened Plates

研究复合材料加筋板受冲击后的损伤演化具有较高的工程应用价值。首先,以某型无人机拟应用的复合材料加筋壁板(T300/BA9913)为研究对象,对其进行低速冲击试验;在壁板中央处和肋与壁板胶结处进行冲击,其冲击能量取6.67 J/mm,测量凹坑深度和分层损伤面积。然后,应用商业软件ABAQUS,编写相应的VUMAT子程序对冲击损伤进行模拟,软件中采用适宜的材料模型、单元种类并建立不同属性的接触,把基于应变的三维Hashin准则运用于复合材料单层板的损伤失效准则中去。最后,运用基于断裂韧度的连续的刚度退化方针对材料的刚度折减。将所建立的冲击模型的模拟结果与冲击试验数据进行对比,证明了冲击模型的有效性和准确性。

Study on the post-impact damage evolution of composite stiffened panels is of highly value in engineering application.First,take a type of UAV as a research subject,in which the stiffened composite panels(T300/BA9913) are applied.The panel is tested by low velocity impact.Impact on the middle of the wall plate and the joint of rib and wall plate,the impact energy is 6.67 J/mm,measuring the impact indentation depth and delamination damage area.Then the commercial software ABAQUS is applied and the corresponding VUMAT subroutine is written to simulate the impact damage.The strain-based 3D Hashin criterion is applied to the damage criterion of composite single-layer panels by using the suitable material model,the type of unit and the contact with different attributes in the software.Finally,the stiffness reduction of materials based on continuous stiffness degradation principle of fracture toughness is compared with the impact test data,and the validity and accuracy of the established impact model are verified.