This paper deals with dynamic tensile characteristics for the polypropylene used in an IP(Instrument
Panel). The dynamic tensile characteristics are important because the PAB module undergoes high
speed deformation during the airbag expansion. The dynamic tensile tests are performed at the low
temperature(30°C), room temperature(21°C) and high temperature(85°C). The tensile tests are carried
out at strain rates of six intervals ranged from 0.001/sec to 100/sec. Tensile tests of polymers are
rather tricky since polymer does not elongate uniformly right after the onset of yielding unlike the
conventional steel. A new method is suggested to get the stress-strain curve accurately. The
optimization method produced a good stress-strain curves which is in good coincidence with the
stress-strain curve obtained from the experiment.