基于有限元软件Ansys/LS-DYNA，对钢制梯形波纹夹层板在低速碰撞载荷作用下的动态响应进行数值仿真研究，分析碰撞能量、冲头直径大小、碰撞位置和冲头撞击方向对夹层板动响应特性的影响。结果表明，随着碰撞能量从100 J增加到400 J，面板变形呈现出线性增加的趋势，碰撞能量达到一定水平后，结构出现损伤破坏，并且发现这种损伤的发生存在相对恒定的临界值，上面板吸能占比减小了30.5%，芯层和下面板吸能占比依次增加了12.4%，18.1%。冲头直径过小会带来明显的载荷局部效应，碰撞位置位于芯层胞元跨中时芯层无法对冲头进行直接支撑，这都会引起上面板的撕裂破坏，甚至被冲头贯穿。随着冲头撞击角度增加，上面板的撕裂破口逐渐由横向变为纵向，夹层板整体的能量吸收速率逐渐变大。在给定的载荷状况下，冲头30°撞击时，夹层板的耐撞性能较优；冲头90°撞击时，夹层板的耐撞性能较差。
The dynamic response of the trapezoidal corrugated steel sandwich panels under low velocity impact load was investigated by employing the FEM code Ansys/LS-DYNA. The influences of impact energy, impactor diameter, impact location and impact angle on the sandwich panel performance were specifically analyzed. Results show that the displacement of the top face and bottom face increases linearly with the increase of impact energy from 100 J to 400 J. The panel begins to damage when the impact energy reaches a certain level. And there is a relatively constant critical value for the damage of the top face.The absorbed energy of the top face decreases by 30.5%, while that of core and bottom face increases by 12.4% and 18.1%. Small impact diameter will increase the locality of impact load and the core is unable to directly support the impactor when the middle of core is impacted, both of which can cause a tearing or penetration failure on the top face. The tearing on the top face is gradually changing from horizontal to vertical, and the energy absorption rate of the sandwich panel increases gradually with the increase of the impact angle. It is found that under the given load condition, the load carrying capacity of the sandwich panel is relative strong at 30 degrees but weak at 90 degrees.
2018,(): 27-34 收稿日期：2017-02-06
DOI：10.3404/j.issn.1672-7649.2018.01.005
分类号：U661.43
作者简介：陈凯(1991-),男,硕士研究生,研究方向为结构冲击动力学
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