P‐12.9: Mechanical simulation analysis of the failure risks and influence factor of foldable module

In order to ensure the foldability of the foldable screen, it has to maintain a low fold stress through optimization of the foldable modulus stacking structure and materials. Nonlinear mechanical simulation can be an effective tool to provide insights into folding behavior. Previous simulation only focused on analyzing the stress of foldable module in the folded state. In this work, the stress of the module was analyzed not only in the folded state but also during the unfolding process by simulation. Different folding programs considering the creep of the adhesive layer in a bending state were simulated. From these results, we confirm that the load history may have a significant impact on the stress of the foldable module. Long term retention in a folded state significantly increases the risk of failure during the unfolding process. It is necessary to consider the influence of the folded state maintenance process when designing experimental schemes to test the folding ability of foldable module. Furthermore, we confirm that these risks are related to creep&recovery performance of the adhesive layer, and a material with low creep or high instantaneous creep recovery rate is required to increase the foldability.