含初始裂纹铝合金板在反复冲击载荷下的动态响应

Dynamic response of aluminum alloy plate with initial cracks under repeated impacts

[目的]为研究含初始裂纹铝合金板在反复冲击载荷作用下的动态响应影响,[方法]通过开展铝合金板的反复冲击试验和有限元仿真研究,分析在反复冲击载荷下铝合金板的动态响应特性,比较完整铝合金板和含初始裂纹铝合金板在反复冲击载荷作用下的冲击力和破坏模式。[结果]试验结果与仿真计算取得较好的吻合。结果表明,在反复冲击载荷作用下,铝合金板对初始裂纹较为敏感;初始裂纹会降低铝合金板的承载能力,使得冲击力减小,反复冲击直至失效的冲击次数减小;含初始裂纹铝合金板的破坏模式也会受到影响。[结论]研究结果可对铝合金船体外板的结构强度计算和评估提供一定的依据和参考。

[Objectives]This paper aims to study the effects of initial cracks on the dynamic response of aluminum alloy plate under repeated impacts.[Methods]Through the repeated impact test and finite element simulation of the aluminum alloy plate,we analyze the dynamic response characteristics of the aluminum alloy plate under repeated impacts,and compare the impact loads and failure modes of the aluminum alloy plate with and without initial cracks.[Results]The test results are in good agreement with the simulation calculations.The results show that the aluminum alloy plate is sensitive to initial cracks under repeated impacts;the initial cracks can reduce the load carrying capacity of the aluminum alloy plate,resulting in the reduced impact load and the reduced number of the repeated impacts for failure;the failure modes are also influenced by the initial cracks under repeated impacts.[Conclusions]The research in this paper provides a certain basis and reference for calculating and evaluating the structure strength of aluminum alloy hull plate.