Time-Temperature Dependence of Compressive Behavior of Polypropylene Foams

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The time-temperature dependence of the compressive behavior of polypropylene (PP) foam was investigated to make predictions about what sort of behavior for wide ranges of temperature and strain rate. Compressive stress relaxation tests were conducted at 213 K and 373 K. Compression tests were also conducted. The strain rate was 2×10-3 1/s at 213 K and 373 K. The compressive stress-strain curves were roughly linear and dependent on temperature until the maximum stress was reached. The maximum stress occurred at 5% strain regardless of temperature. The plateau stresses decreased as temperature increased. By plotting compressive behavior of the PP foam at the master curve of the stress relaxation modulus, its temperature dependence could be explained by the thermo-viscoelastic properties. Therefore, the behavior of PP foam at different strain rates could be approximately predicted from the stress relaxation modulus with the timetemperature equivalence principle.

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Periodical:

Key Engineering Materials (Volumes 345-346)

Edited by:

S.W. Nam, Y.W. Chang, S.B. Lee and N.J. Kim

Pages:

153-156

Citation:

J. J. Hwang et al., "Time-Temperature Dependence of Compressive Behavior of Polypropylene Foams", Key Engineering Materials, Vols. 345-346, pp. 153-156, 2007

Online since:

August 2007

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$38.00

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[10] [0] [10] [5] [10] [10] [10] [15] [0] [4] [8] [12] [16] [20] Compressive stress σ [MPa] Reduced time t' [s] T = 213 K 233 K 253 K 273 K 298 K 313 K 333 K 353 K 373 K Maximum stress Plateau stress Fig. 9 Compressive stress for reduced time obtain from stress relaxation test.

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