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Creep crack growth rates were measured using centrally cracked tension specimens of thin polypropylene film with different crack lengths at various stresses and temperatures. The creep crack growth rates were correlated with the stress intensity factor. There was the region of the minimum constant crack growth rate which occupied more than 70% of the total creep failure life. This constant creep crack growth rate characteristics were analyzed on the basis of the stress-dependent Arrhenius type thermally activated process.

The relationship between the stressσ and time t of an SUS303 round bar was measured using an intelligent universal test chine ． The elasticity plasticity transition point a ．，， which was a stress of 血 e boundary of plasticity and elasticity ， was obtained by the analysis of the measurement result ， As the coordinates of the complementary energy Ec ， the horizontal axis shows the load P and the vertical axis shows the de旧 orm ロtion δ ． Moreover ， the analysis of the complementary energyEc was carried out． The difference in the complementary energy Ec of each stress as a step stress び ∫t was calculated twice ， The elasticity plasticity transition point σ 。 p was obtained by this method ． A static torsion test on an FCD370 round bar was also carried out ． The difference in the complementary energy Ec of the FCD370 round bar was calculated twice similarly to that of the SUS303 round baL The elasticity plasticity transition point τ ep of the FCD370 round bar was obtained ． Key 恥 rds ：lntel ' igent Universal Test Mac 漉 e ， Elasticity ， P ' asticit ｝ 跏 8 ' 0 η ， 1br∫ foη ． 1． 緒 言

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