List of Articles نیروی متوسط لهیدگی Open Access Article Abstract Page Full-Text 1 - Numerical simulation of energy absorbing bumpers two cylindrical tube filled with polyurethane foam mohammadreza RezaeiAbadeh Mohammad Javad Rezvani Open Access Article Abstract Page Full-Text 2 - Numerical investigation of energy absorption semi apical angel in conical grooved tubes under dynamic axial load and comparing quasi-static and dynamic loading Nima Asadi Dehmirahmadi Mohammad Javad Rezvani