在Ls-Dyna下整个仿真评估流程如下:
一、模型构建
二、材料定义
三、单元算法定义
四、状态方程控制
五、属性赋予
六、连接关系设置
七、边界与载荷条件
八、求解设置
九、求解
十、结果解读
本文主要采用重启动分析,在小球接触前设置为刚体,在接触瞬间将刚体转换为柔性体进行评估。采用壳体小球和梁单元进行分析,注意梁单元局部与壳体小球进行共节点,最终效果如图1所示
图1
本文采用1号材料*MAT_ELASTIC和3号材料*MAT_PLASTIC_KINEMATIC进行壳体材料定义,具体设置如图2所示。
图2
采用关键字*SECTION_SHELL和*SECTION_BEAM针对壳体和梁单元进行单元算法定义,具体设置如图3所示;
图3
无状态方程定义
将定义好的材料以及单元算法赋予给对应part,如图4所示;
图4
设置自动单面接触*CONTACT_AUTOMATIC_SINGLE_SURFACE,设置默认,具体如图5所示。
图5
本模型仿真采用*INITIAL_VELOCITY施加初始速度,采用*LOAD_BODY_Y施加重力加速度,同时使用*BOUNDARY_SPC_SET约束梁顶点的平动自由度,释放转动自由度,具体如图6所示。
图6
采用以下关键字进行相关设置把控
*DEFORMABLE_TO_RIGID:将柔性体转换为刚性体;
*CONTROL_TERMINATION:控制求解截止时间;
*DATABASE_BINARY_D3PLOT:定义结果输出间隔;
具体设置如图7所示
图7
将k文件输入dyna进行求解,需要控制求解线程数和求解内存,如图8所示
图8
将生成的重启动文件d3dump和补充的K文件导入重启动求解器进行二次求解,如图9所示。
图9
最终结果如图10所示。
图10
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