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编写了复合材料损伤的VUMAT子程序,并结合Johnson-Cook金属损伤模型和表面内聚力行为层间分层方法建立了玻璃纤维增强铝合金层板(GLARE)受落锤低速冲击的数值模型.分析了能量吸收、形变情况及锤头接触力的变化,并通过与实验结果的比较验证了有限元方法的可靠性.利用有限元方法能够更全面分析材料损伤变化的优势,模拟了GLARE三维渐进失效、铝合金层的失效以及纤维层和铝合金层界面分层的破坏模式.通过综合分析该三种渐进失效与能量吸收、形变情况及锤头接触力的变化,揭示了玻璃纤维增强铝合金层板受落锤低速冲击下的破坏机理,验证了铝合金层板的加入对于玻璃纤维增强铝合金层板抗冲击性能增强规律.
The VUMAT subroutine of composite damage was written and a numerical model of glass fiber reinforced aluminum alloy laminates (GLARE) subjected to low velocity impact was established based on Johnson-Cook metal damage model and surface cohesion behavior layering method. Energy absorption, deformation and change of the contact force of the hammer, and verify the reliability of the finite element method by comparing with the experimental results.Using the finite element method, the advantages of the material damage change can be analyzed more fully, Aluminum alloy layer failure and fiber layer and aluminum alloy layer interface layer failure mode by comprehensive analysis of the three progressive failure and energy absorption and deformation and the contact force of the hammer changes reveals the glass fiber reinforced aluminum alloy laminate By the failure mechanism of the drop hammer under the impact of low speed, it verifies that the addition of aluminum alloy plate enhances the impact resistance of glass fiber reinforced aluminum alloy laminate.