Knowledge of mechanical stresses on foldable devices is the key factor to develop them. When you study stresses, you should control motion profile then study dynamic stress. In our study, we reproduce some motions on our folding tester, compare a result of simulation and real mechanical stress.
We propose a novel method for filling a gap in originally invisible mechanical behavior in modeling, evaluation and product by using mechanoluminescent (ML) visual sensing. To demonstrate the effect of the method, mechanical information was evaluated in folding test of flexible electronics film. As a result, the appearance of strain concentration was successfully visualized on the basis of mechanoluminescence, and complex dynamic mechanical information was instinctively understood from the time course of the ML patterns. In addition, the ML pattern clearly depends on sticking situation of the flexible film on a folding-plates with a gripping tape even in the same test conditions such as folding radius, material and thickness which are considerable major factors on mechanical behavior at folding. Moreover, it was found that microcracks generation was detected during folding cycle as blinking of ML points, and it occurred even from 10 cycles fatigue of the flexible film in endurance folding test.
Knowledge of mechanical stresses on foldable devices is the key factor to develop them. When you study stresses, you should control motion profile then study dynamic stress. In our study, we reproduce some motions on our folding tester, compare a result of simulation and real mechanical stress.
Understanding of mechanical stresses on foldable devices is important to develop them. In other words, it is important to analyze dynamic strain by controlling motion profile, to design mechanical structure with lowered stress. In order to elucidate dynamic strain, here we explore several ways of strain analysis by novel methods.
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