Two-process constitutive model for semicrystalline polymers across a wide range of strain rates

Abstract

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Numerical and Experimental Results on Charpy Tests for Blends Polypropylene + Polyamide + Ethylene Propylene Diene Monomer (PP+PA+EDPM)

“…The results reported in the literature show that polymers also have a stress-strain curve dependent on the strain rate (if other test parameters are kept constant) [24], [47]. The tested polymeric blends are based on polyamide 6 (PA6), polypropylene (PP) and EPDM (ethylene propylene diene monomer rubber), polybond 3000 și kritilen, the blend concentration being given in Table 1.…”

“…-models are using very different mesh web rougher or finer (especially near the notch) [18][19][20], on a quarter or half of the sample, from 2D to 3D [21], but new achievement in hardwares and dedicated softwares allows for using finer mesh, all the sample, investigation on strain and stress, simulation in actual time etc., -first models did not take into account friction, but recent ones have included condition for friction, usually with a constant friction coefficient, -at the beginning, constitutive models were simpler, implying only a failure criterion, usually the strength limit in tensile and there has been interest in performant materials like steel, titanium and aluminum alloys [22], [23]; for polymers and especially for blends fewer research reports being [24][25][26][27]].…”

Numerical and Experimental Results on Charpy Tests for Blends Polypropylene + Polyamide + Ethylene Propylene Diene Monomer (PP + PA + EPDM)

“…Separate power law curves were used to include dynamic flow properties over the strain rate range 10 −5 < terials 2020, 13, × FOR PEER REVIEW 2 of 26 dedicated software allows for using finer mesh, all the sample, investigation on strain and stress, simulation in actual time etc. ; first models did not take into account friction, but recent ones have included condition for friction, usually with a constant friction coefficient; at the beginning, constitutive models were simpler, implying only a failure criterion, usually the strength limit in tensile and there has been interest in performant materials like steel, titanium and aluminum alloys [22,23]; for polymers and especially for blends fewer research reports being [24][25][26][27]; and each model has simplifying hypotheses that could alter the sample behavior as compared to the actual one.…”

“…Reviewing the available literature on this type of tests [ 7 , 8 , 9 , 10 ] and on Charpy impact modeling [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ] pointed out the following aspects: models are using very different mesh web rougher or finer (especially near the notch) [ 18 , 19 , 20 ], on a quarter or half of the sample, from 2D to 3D [ 21 ], but new achievement in hardware and dedicated software allows for using finer mesh, all the sample, investigation on strain and stress, simulation in actual time etc. ; first models did not take into account friction, but recent ones have included condition for friction, usually with a constant friction coefficient; at the beginning, constitutive models were simpler, implying only a failure criterion, usually the strength limit in tensile and there has been interest in performant materials like steel, titanium and aluminum alloys [ 22 , 23 ]; for polymers and especially for blends fewer research reports being [ 24 , 25 , 26 , 27 ]; and each model has simplifying hypotheses that could alter the sample behavior as compared to the actual one. …”

“…at the beginning, constitutive models were simpler, implying only a failure criterion, usually the strength limit in tensile and there has been interest in performant materials like steel, titanium and aluminum alloys [ 22 , 23 ]; for polymers and especially for blends fewer research reports being [ 24 , 25 , 26 , 27 ]; and…”