【摘要】 使用5种冲击头对2024-T3铝合金板进行多次冲击试验,然后通过对冲击后的铝合金板进行轴向压缩试验研究凹坑对铝合金板剩余强度的影响。研究结果表明,随着凹坑深度的增加,5种类型的凹坑以不同的变化规律影响铝合金板的极限强度。然而,相对于冲击过程中产生的平板的整体弯曲变形对极限强度的影响,凹坑本身的影响并不显著。通过对试验数据进行分析,得到冲击能量系数和凹坑深度系数以及极限强度衰减率和凹坑深度系数的方程。更多还原

【Abstract】 Drop-weight impact tests were conducted on 2024-T3 aluminum plates with five types of impactors, and then the effects of the dent on the residual ultimate strength of the 2024-T3 specimens were investigated through axial compression tests. Results indicate that with increase in dent depth, the five types of dents affect the ultimate strength of the plate in different trends. Nevertheless, other than the plate global deflection caused by impacting, the dent itself has unremarkable effect on the ultimate strength. The mathematical expressions are derived regarding the relationship between impact energy factor and the dent depth factor as well as the compressive ultimate strength reduction rate and the dent depth factor.更多还原