FAILURE ANALYSIS OF COLLIDED SUBWAY ROLLING STOCKS FOR SAFETY ASSESSMENT

초록

Failure analysis of collided subway rolling stocks was performed for the criteria of safety assessment. Extensive investigations with several advanced engineering analysis techniques including nondestructive evaluation (NDE) techniques, stress and structural analysis programs, mechanical characterization of component materials, etc., were conducted for better understandings and exploration of failure mechanisms and safety concerns. Various types of NDE techniques such as ultrasonic testing and magnetic particle testing, were used to detect manufacture-induced and/or in-service defects and measure the dimensions of deformed and non-deformed parts on damaged rolling stocks. Tensile tests were performed on two different types of specimens in order to evaluate the strength changes before and after damages, obtained from plastic deformed area and nondeformed region of the rolling stocks, respectively. Moreover, stress and structural analyses using commercial I-DEAS software provided important information on stress distribution and load transfer mechanisms as well as the amount of damages during rolling stock crash. In this investigation, various advanced engineering analysis techniques for the failure analysis of subway rolling stocks have been introduced and the analysis results have been used to provide the critical information for the criteria of safety assessment.