Assembly-Induced Stress and Its Effect on the Integrity of Assembly System in Drop Simulation

In this paper, a drop vehicle of LCD system was selected to address the assembly-induced stress and its effect on the integrity of assembly system in drop simulation. A finite element procedure was implemented to analyze a two-step loaded LCD system in terms of ABAQUS/Standard and ABAQUS/Explicit tools. Firstly, the LCD is statically loaded by the pretension of the screws and the pressure of the elastomer to determine the stress/strain equilibrium by using the ABAQUS/Standard tool. Secondly, the pre-stressed LCD system is loaded by dropping it from one and half meters high onto a hard floor to assess its reliability under impact loading by means of the ABAQUS/Explicit tool. From the finite element analysis, it is found that the maximum stress level obtained from a model without assembly-induced pre-stressing is generally smaller than that obtained from a model with assembly-induced pre-stressing. In addition, the effect of the ratio of the pressed thickness of the elastomer to the non-pressed thickness of the elastomer on the LCD reliability was investigated based on the proposed procedure. An optimized ratio was recommended