応力発光塗料を用いた1/10車体モデルにおける応力分布の可視化

抄録

The safety assessment using the actual car body is indispensable in the automobile industry. In recent years, however, cost reduction is also important. Thus, experiments with scale model and finite element analysis (FEA) have been investigated. In order to improve FEA results, measuring the stress distribution of the whole body is quite important. The mechano-luminescent paint is a paint that emits light by the strain on the painted material surface and often used for visualization of the stress distribution on the specimens. In addition, the definite stress and strain value can be calculated from the luminance. In this study, a crash test of car body was conducted with 1/10 scale model, and visualization of the stress distribution on the scale model at clash was investigated. The impactor was set on the linear guide and collided on the model. The mass of the impactor was 51.0 g and the crash velocity was 19.5 km/h. Emission of the paint during the crash test was recorded with high speed cameras. The stress distribution and the propagation of stress waves were observed. The load was absorbed by the entire cabin in the case of the side impact test, and the stress concentration was occurred in the part of the front side member in the case of the front impact test. It has been indicated from the impact test with the scale model painted with the mechano-luminescent paint that this system has a large potential to visualize the stress distribution of the whole car body by the crash tests.