不同冲击角度对复合材料层合板低速冲击损伤特点的影响

doi:10.19936/j.cnki.2096-8000.20240128.004

摘要/Abstract

摘要： 复合材料结构在服役过程中常受到低速冲击影响,产生不可目视的内部损伤,这将降低结构的承载能力。实际工程中,低速冲击物与结构相互作用时,可能呈现不同的冲击角度。因此,本文针对一种典型铺层的碳纤维/环氧复合材料层合板,采用ABAQUS建立90°和不同倾斜角度的低速冲击数值模型,以分析不同冲击角度对层合板接触力与损伤的影响,以及冲头旋转造成的二次接触对损伤的影响。在数值模型中,采用连续介质损伤力学模型和三维Hashin准则模拟层内的失效,并采用内聚力模型与双线性牵引-分离本构关系模拟层间分层。对90°模拟结果与试验结果进行对比分析,结果证明了所建立数值模型的可靠性。不同冲击角度冲击模拟结果表明:在冲击角度从30°升至90°过程中,法向接触力始终增大,切向接触力先增大后减小;随着冲击角度的减小,损伤的整体偏移逐渐明显,并且基体拉伸损伤面积始终较大。不同冲击能量下的二次接触模拟结果表明,随着冲击能量增大,产生二次接触的冲击角度范围减小,且二次接触对层合板顶部造成了新的损伤。

关键词: 复合材料, 低速冲击, 倾斜冲击, 损伤

Abstract: Composite structures are usually subjected to low-velocity impact during service, which results in invisible internal damage and decreases the loading ability of structures. In the actual engineering, when the low-velocity impactor interacts with the structure, it may present different impact angles. Consequently, in this paper, focusing on a typical layup of carbon/epoxy laminate, a low-velocity impact numerical model of 90° and different impact angles were established using ABAQUS. The model is used to analyze the effects of different impact angles to the contact force and damage of laminate, and the effects of second contact caused by impactor rotation to damage. In numerical model, the intralaminar damage was simulated using the continuum damage mechanics and 3D Hashin criterion. The interlayer delamination was simulated using cohesive model and bilinear tractor-separation constitutive relation. The comparison between the 90° simulation result and the test result proves the reliability of the numerical model. The simulation results of different impact angles show that, when the impact angle increases from 30° to 90°, the normal contact force always increases, while the tangential contact force first increases and then decreases. With the decrease of the impact angle, the overall deviation of the damage is more obvious, and the damage areas caused by the matrix tension is always larger. The simulation results of the successive contact under different energies show that, with the increase of impact energy, the impact angle range causing the successive contact decreases, and the successive contact causes new damage to the top of laminates.

Key words: composite, low-velocity impact, oblique impact, damage

中图分类号:

TB332

林逸, 刘玲. 不同冲击角度对复合材料层合板低速冲击损伤特点的影响[J]. 复合材料科学与工程, 2024, 0(1): 30-37.

LIN Yi, LIU Ling. Effects of different impact angles on the damage characteristic of composite laminates under low-velocity impact[J]. COMPOSITES SCIENCE AND ENGINEERING, 2024, 0(1): 30-37.

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