Mechanical response of polypropylene under multiple-step loading

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Abstract

Experimental data are reported on isotactic polypropylene in uniaxial multiple-step cyclic tests at room temperature. The deformation programs involve (i) one- and two-step cyclic tests with a stress-controlled program (ratcheting with various maximum stresses and the zero minimum stress), (ii) short-term creep tests on specimens subjected to cyclic deformation, (iii) cyclic tests with a stress-controlled program on specimens subjected to creep flow, and (iv) triple-step tests (ratcheting with various maximum stresses interrupted by creep). A pronounced difference is observed in damage accumulation under creep and cyclic loading. Applicability is discussed of these observations for lifetime prediction under fatigue conditions. © 2012 Elsevier Ltd. All rights reserved.

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Drozdov, A. D. (2013). Mechanical response of polypropylene under multiple-step loading. International Journal of Solids and Structures, 50(5), 815–823. https://doi.org/10.1016/j.ijsolstr.2012.11.014

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