333 / 2019-09-30 21:09:59

低温环境下薄板的反复冲击实验研究

低温，裂纹，力学性能

结构优化与结构行为分析 > 结构力学行为分析

低温环境下薄板的反复冲击实验研究

摘要
极地船舶壳板结构遭受浮冰的反复碰撞下，其承载性能对于船舶结构的安全性直观重要。本文针对薄板结构，开展了常温（20℃）和低温（-40℃）环境下的反复冲击实验研究，讨论了薄板试件含裂纹时对承载能力的影响，研究结果表明：在低温环境下，薄板的冲击力较常温环境大，但塑性变形小，在较高冲击能量下，完整板出现颈缩并朝一侧破裂。对于含裂纹薄板来说：随着冲击次数的增加，裂纹尺寸对薄板的冲击力和塑性变形影响较大。在较低冲击能量下，裂纹板在中心处出现裂纹并沿裂纹长度和宽度方向扩展。

关键词：低温，裂纹，力学性能
Abstract
Under the repeated impact of ice floe, the bearing capacity of the shell-plate structure of the ships in polar region is very important for the safety of the ship structure. In this paper, repeated impact tests for thin plate structures at room temperature (20℃) and low temperature (-40℃) are carried out. The effect of cracks on the load-carrying capacity of the thin plate specimens is discussed. The result shows that the impact force of the thin plates at low temperature is larger than that at normal temperature , but the plastic deformation is smaller. At high impact energy, the intact plates neck and rupture to one side. For the thin plates with cracks, with the increase of impact number, the crack size has a greater impact on the impact force and plastic deformation of the thin plates. At low impact energy, cracks appear in the center of the cracked plates and propagate along the length and width of the cracks.

Key words: low temperature, crack, mechanical property