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球状飞射物对屋面瓦片的损伤效应数值模拟研究
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摘要
本文选取典型的球状飞射物,考虑其对一种典型屋面粘土瓦片的冲击破坏作用。参考已有落球冲击试验,并基于ANSYS/LS-DYNA平台,建立了冲击碰撞的有限元计算模型,选取Johnson-Holmquist-Ceramic本构模型模拟粘土瓦片材料,采用显式动力学方法研究了落球冲击试验中瓦片应力、应变、变形的时变机理,引入单元失效准则模拟了碰撞过程中瓦片的破坏过程,计算结果与实验结果吻合良好。针对瓦片倾角、球块速度、球块质量进行了参数分析,研究结果表明:瓦片损伤程度与其倾角相关性不大,与球块速度及球块质量成正比。在此基础上建立飞射物损伤方程,并计算瓦片的破坏临界值。
In this paper,a typical spherical debris is selected to study its impact effect on a typical clay roof tile. Based on ANSYS/LS-DYNA,an impact model is established,in which the Johnson-Holmquist-Ceramic constitutive model is chosen to simulate clay roof tile,and explicit dynamic algorithm is used to study the time history of the tile stress,strain and deformation during the drop-ball experiment,and the element strain failure criteria is introduced in this simulation. The numerical simulation results coincide well with the experiment results. The impact effect influences of tile inclination angle,sphere velocity and sphere mass are analyzed. The results show that the tile damage effect has no relationship with the inclination angle while it is basically proportional to the sphere velocity and sphere mass. On this basis,a damage function is established to calculate the damage threshold of the tile.
引文
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