Objectives To study the mechanical behavior of aluminum alloy sheet for ships under low-speed impact loads, horizontal low-speed impact dynamic response tests were conducted on 5059-H116 aluminum alloy plates.
Methods Based on impact tests, compare the damage and dynamic response of test plates under different impact speeds and masses. Based on a mixed hardening plastic model, a low-speed impact numerical model is established to numerically simulate the failure process under different impact velocities. The finite element method is used to analyze the influence of specimen size, impact position, and impact head shape on the critical failure energy, and a modified empirical formula for the critical failure energy is proposed.
Results The research results indicate that with the increase of impact velocity, the critical failure energy of the test plate increases correspondingly, but the increase is very small. Under the same impact energy, different impact masses have no effect on the critical failure energy of aluminum alloy sheet. The sensitivity of critical failure energy to the aspect ratio of the test plate is very small. The critical failure energy of blunt impact test plates with the same cross-sectional area can be considered equivalent.
Conclusions The research results can provide reference for the study of low-speed impact mechanical behavior and load-bearing capacity of aluminum alloy sheet.
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