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Three Point Bending Analysis of a Mobile Phone Using LS-DYNA Explicit Integration Method

In this article, the 3 point bending analysis of a mobile phone using LS-DYNA explicit integration method is discussed. Since there are a large number of contact pairs defined in the FEA model, and the FEA model is very large in a 3 point bending analysis of a phone, it is much more convenient to use the explicit method than the implicit method. However, using explicit procedure to a quasi-static analysis requires some special consideration. Since a quasi-static solution, is by definition, a long-time solution. It often requires an excessive number of small time increments. It is computationally impractical to conduct the simulation in its natural time scale. In real analysis, the quasi-static event is artificially accelerated by two approaches to reduce the computation time. One approach is to use mass scaling. Another approach is to increase the loading rate. These two approaches are closely related and should work together. If they are properly used, the speed of the analysis could be increased substantially without severely degrading the quality of the quasi-static solution. We discuss in this article how the loading rate and mass scaling factor affect each other, how to select proper values of these two parameters, and how to use these two approaches in the 3 point bending analysis of a mobile phone.