펀치각도가 팽창튜브의 에너지흡수특성에 미치는 영향에 대한 실험적 연구

다국어 초록 (Multilingual Abstract)

Expansion tube is used as crash energy absorber when a crash accident occurs. The expansion tube dissipates the kinetic energy as friction and internal(plastic) energy, which are generated by expanding the tube with punch. In this paper the effect of conical angle of punch on energy absorbing characteristic of SCM440 expansion tube was studied in qusi-static experiments with three punches having different conical angles(15°, 30°, 45°). Finite element analysis were performed to confirm the effect of the conical angles on friction and internal energy. Two friction models, coulomb friction and constant shear friction, were used in the finite element analysis to confirm the variation of each friction coefficient(μ, m) with respect to the conical angles. The results of the experiment and finite element analysis indicate that the energy absorbed by tube were very sensitive to the change of the conical angles. Friction coefficient and friction energy decreased with increase of the conical angles. The internal energy, however, increased with increase of the conical angles.