Abstract:

The theories of central difference arithmetic,stable time'slimit and the theory of energy balance were analyzed systematically,the impact of stable time's limit and energy balance due to
mechanical parameters of materials such as stiffness,density and mesh
density was researched.Then a finite element model was built and the method of
Wheatstone bridge was used to validate model's accuracy.Finally,a detail research on PCB collision was made based on the experiments and simulation,it indicates
that ABAQUS/Explicit can deal with the impact load precisely.The calculation cost will be reduced and the precision will be satisfied as well by applying the theory of energy balance,the strength of the packaging meets the reliability requirements of PCB.

Key words: ABAQUS/Explicit, printed-circuit-board(PCB), stable time limit, theory of energy balance, impact load

摘要：

分析了ABAQUS/Explicit动力学的中心差分算法、稳定时间极限、能量平衡理论,研究了材料刚度、密度等力学参数以及网格密度对稳定时间极限和能量平衡的影响。建立了PCB板跌落的有限元模型，并采用惠斯通电桥测量应变法验证了有限元模型的准确性,在此基础上进行PCB板跌落研究。结果表明：ABAQUS/Explicit能够非常精确地处理冲击载荷问题;运用能量平衡理论可以在满足精度的前提下尽可能减小计算量。

关键词: ABAQUS/Explicit, PCB, 稳定时间极限, 能量平衡, 冲击载荷