This page has only limited features, please log in for full access.
A constitutive material model suitable for capturing the biaxial deformation response of poly-ether-ether-ketone (PEEK) films is presented. During the forming of thin PEEK films, a multi-axial state of stress is imposed when the thermally softened sheet is forced to take the desired shape of the mould. Simulation and optimization of the forming of products are capable through the use of modern computational tools, however can only be performed with accurate knowledge and modelling of the constitutive material response subject to process variables. Load-controlled biaxial testing of specimens at conditions analogous to the forming process highlighted the anisotropic, nonlinear viscoelastic material stress-strain behaviour. The Buckley material model accounts for the temperature and strain rate dependence of the biaxial yield behaviour, and further modified to represent inherent anisotropy within samples. The modelled stress-strain results show that the adapted material model is accurate in reproducing the observed biaxial deformation behaviour of PEEK films, providing future promise as a platform for the development of finite element simulations of the forming process.
Josh A. Turner; Gary H. Menary; Peter J. Martin. Modelling the constitutive behaviour of poly(ether-ether-ketone) for forming processes. PROCEEDINGS OF THE 22ND INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2019 2019, 2113, 130006 .
AMA StyleJosh A. Turner, Gary H. Menary, Peter J. Martin. Modelling the constitutive behaviour of poly(ether-ether-ketone) for forming processes. PROCEEDINGS OF THE 22ND INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2019. 2019; 2113 (1):130006.
Chicago/Turabian StyleJosh A. Turner; Gary H. Menary; Peter J. Martin. 2019. "Modelling the constitutive behaviour of poly(ether-ether-ketone) for forming processes." PROCEEDINGS OF THE 22ND INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2019 2113, no. 1: 130006.
The biaxial tensile properties of thin poly-ether-ether-ketone (PEEK) films are presented. Investigation into the biaxial mechanical behaviour of PEEK films will provide a preliminary insight into the anticipated stress/strain response, and potential suitability, to the possible fabrication of thin walled parts through stretch blow moulding and thermoforming processes – with the multi-axial state of strain imposed onto the heated thermoplastic sheet representative of the expected strain history experienced during these material forming processes. Following identification of the prospective forming temperature window, the biaxial mechanical behaviour of the material is characterized under differing modes of deformation, at a nominal strain rate of 1 s−1. The temperature dependence is outlined within – with an appreciable increase in flow behaviour correlated with specimen temperature exceeding its glass transition temperature (Tg).
Josh Turner; Gary Menary; Peter Martin. Biaxial deformation behaviour of poly-ether-ether-ketone. PROCEEDINGS OF THE 21ST INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2018 2018, 1960, 120021 .
AMA StyleJosh Turner, Gary Menary, Peter Martin. Biaxial deformation behaviour of poly-ether-ether-ketone. PROCEEDINGS OF THE 21ST INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2018. 2018; 1960 (1):120021.
Chicago/Turabian StyleJosh Turner; Gary Menary; Peter Martin. 2018. "Biaxial deformation behaviour of poly-ether-ether-ketone." PROCEEDINGS OF THE 21ST INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2018 1960, no. 1: 120021.