폴리프로필렌의 온도에 따른 동적인장특성 평가

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℃), room temperature(21℃) and high temperature(85℃). 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.