基于显示动力学模拟的草莓冲击碰撞损伤分析

Strawberry impact collision injury analysis based on display dynamics simulation

目的:解决加工过程草莓在冲击作用下易损伤引起品质下降的问题。方法:利用显示动力学模拟方法研究草莓碰撞过程冲击能损耗、内部应力及冲击损伤间的关系,采用响应面法分析碰撞参数对冲击损伤程度及敏感性的影响。结果:草莓碰撞钢板23 ms时,草莓的损伤体积比(7.83%)达到最大,同时冲击能损耗值(95.60 mJ)和内部应力(0.2384 MPa)均达到最大值;碰撞模拟结果误差均<5.0%,仿真方法可靠。结论:碰撞过程冲击能的变化引起草莓内部应力动态响应,从而决定了冲击损伤程度;果实损伤敏感性的影响因素为接触材料>冲击速度>碰撞角度。

Objective:Aiming at the problem that strawberry quality was easy to be damaged under impact in processing process.Methods:The relationship among impact energy loss,internal stress and impact damage of strawberry during impact was studied by display dynamics simulation method.The impact of impact parameters on damage degree and sensitivity was analyzed by response surface method.Results:When the strawberry collides with the steel plate at 23 ms,the ratio of strawberry damage volume reached the maximum(7.83%),and at the same time,the impact energy loss(95.60 mJ)and internal stress(0.2384 MPa)both reached their maximum values.The error of collision simulation results was less than 5.0%,and the simulation method was reliable.Conclusion:The dynamic response of internal stress in strawberry is caused by the change of impact energy,which determines the impact damage degree.The influencing factors of fruit damage sensitivity were:contact material>impact velocity>impact angle.