caa a22 4500 378903675 CHVBK 20180305123524.0 cr unu---uuuuu 161128e20041201xx s 000 0 eng 10.1515/epoly.2004.4.1.737 doi (NATIONALLICENCE)gruyter-10.1515/epoly.2004.4.1.737 Deformation of the lamellar structure in semi-crystalline polymers studied by computer simulations [Elektronische Daten] [Júlio C. Viana, Carlos J. Ribeiro, Gustavo R. Dias] Yield in a semi-crystalline polymer involves the disruption of the crystalline phase in an irreversible deformation process. In a semi-crystalline polymer, the crystalline lamellar regions are bridged together by inter-lamellar amorphous layers, which act as a loading transfer medium. The deformation of both phases is, therefore, to some extent inter-related. In this work we adopted a continuous mechanic approach (neglecting atomic/molecular interactions) of the lamellar deformation of semi-crystalline polymers in the sense that we simulated the mechanical response of a lamellar structure (two lamellae interconnected by amorphous regions) in a finite element analysis. The use of computer simulations allows studying independently the effect of each relevant morphological parameter on the mechanical response. Several simulations were performed considering isolated variations of the following morphological parameters: i) mechanical behaviour of the amorphous material; ii) thickness of the crystalline regions; iii) length of the amorphous regions; iv) number of amorphous regions connected with a crystalline lamella; v) relative angle between the crystalline and the amorphous regions; vi) mode of loading (tension and compression). The thickness of the crystalline lamellae is evidenced as the most significant factor affecting the tensile response of the lamellar structure, followed by the mechanical behaviour of the amorphous phase. The connection angle between amorphous and crystalline regions and the number of amorphous regions bridging adjacent crystalline lamellae play only a minor role. The length of the amorphous regions has a negligible influence. As expected, the lamellar structure shows also distinct behaviours under distinct loading modes, tensile loading showing the highest stresses. © 2013 by Walter de Gruyter GmbH & Co. Viana Júlio C. IPC - Institute for Polymers and Composites, Department of Polymer Engineering, University of Minho, Campus Azurém, 4800-058 Guimarães, Portugal; Fax +351 253 510339 aut Ribeiro Carlos J. IPC - Institute for Polymers and Composites, Department of Polymer Engineering, University of Minho, Campus Azurém, 4800-058 Guimarães, Portugal; Fax +351 253 510339 aut Dias Gustavo R. IPC - Institute for Polymers and Composites, Department of Polymer Engineering, University of Minho, Campus Azurém, 4800-058 Guimarães, Portugal; Fax +351 253 510339 aut e-Polymers De Gruyter 4/1(2004-12-01), 737-750 2197-4586 4:1<737 2004 4 epoly https://doi.org/10.1515/epoly.2004.4.1.737 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/epoly.2004.4.1.737 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Viana Júlio C. IPC - Institute for Polymers and Composites, Department of Polymer Engineering, University of Minho, Campus Azurém, 4800-058 Guimarães, Portugal; Fax +351 253 510339 aut NATIONALLICENCE 700 1- Ribeiro Carlos J. IPC - Institute for Polymers and Composites, Department of Polymer Engineering, University of Minho, Campus Azurém, 4800-058 Guimarães, Portugal; Fax +351 253 510339 aut NATIONALLICENCE 700 1- Dias Gustavo R. IPC - Institute for Polymers and Composites, Department of Polymer Engineering, University of Minho, Campus Azurém, 4800-058 Guimarães, Portugal; Fax +351 253 510339 aut NATIONALLICENCE 773 0- e-Polymers De Gruyter 4/1(2004-12-01), 737-750 2197-4586 4:1<737 2004 4 epoly CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter