| 摘要: |
| 使用数值方法模拟考虑接触变形的梁受到球横向弹性碰撞的全过程。通过计算分析了球和梁的刚度、撞击速度、质量比等因素对梁所受到的冲击荷载的影响,发现:考虑接触变形后,冲击荷载有合理的升压段;球体的弹性模量越小,冲击荷载的峰值越小,每次接触的时间越长;在质量比不变的情况下,冲击荷载的峰值与初速度成正比;初速度越小,每次接触的升压和卸压时间越长,相邻2次接触的时间间隔越小,相邻的卸压和升压段间距越小;速度相同时,质量比越大,荷载峰值越小,且撞击物脱离接触的过程越明显,升压段和卸压段持续时间越短。 |
| 关键词: 梁 球 横向冲击荷载 数值方法 接触变形 |
| DOI：10.11841/j.issn.1007-4333.2007.03.071 |
| 修订日期：2006-09-20 |
| 基金项目:中国农业大学校科研和教改项目 |
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| A probe into elastic impact load of beam subjected to lateral impact of ball |
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| Abstract: |
| The elastic impact procedure of a beam under lateral impact of ball was simulated by using numerical method in which the contact deformation was considered.From calculation results,the effects of rigidity of ball and beam,velocities and mass ratios on the impact load were analyzed.The impact load results show that there is reasonable ascending part in the numerical results when the contact deformation is considered.The smaller the elastic modulus of the ball,the smaller the peak value of impact load and the longer the contact time.When mass ratio is constant,the peak value of impact load is proportional to the velocity.The smaller the velocity of the ball,the longer the ascending and descending part of one contact and the shorter the interval between neighboring contacts and neighboring descending and ascending parts.When the velocity is constant,the bigger the mass ratio,the smaller the peak value of impact load and the longer the duration of no contact of moving ball,the shorter the ascending and descending part. |
| Key words: beam,ball,lateral impact load,numerical solution,contact deformation |
