Strain whitening of a thermoplastic olefin material |
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| Authors: | P Wang I M Hutchings S J Duncan L Jenkins E Woo |
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| Affiliation: | (1) Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QZ, UK;(2) Institute for Manufacturing and Management, Department of Engineering, University of Cambridge, Mill Lane, Cambridge, CB2 1RX, UK;(3) One NorthEast, Great North House, Sandyford Road, Newcastle upon Tyne, NE1 8ND, UK;(4) Visteon Customer and Technology Centre, Visteon UK Limited, Endeavour Drive, Basildon, Essex, SS14 3WF, UK;(5) Technical Department, Bridon International Ltd., Carr Hill, Doncaster, DN4 8DG, UK |
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| Abstract: | This paper presents research work on the characteristics and micro mechanism of strain whitening of a thermoplastic olefin material. Systematic tensile tests have been carried out to investigate the relation between strain whitening extent and external factors, including the deformation employed and the environmental temperature. A new optical method has been developed for the measurement of strain on polymer tensile samples. Applying this method relation between whitening level (grey level change) and strain has been studied. A new concept of ‘strain whitening sensitivity’ has been proposed and defined as the strain whitening induced by unit deformation or strain. Non-monotonic relation between whitening level and strain has been found. Strained and fractured samples were observed with A JEOL 5800 LV SEM for the micro mechanism investigation. The change of microstructure on the sample surface has been extensively observed and the combined effects of small ridges and micro-voids on the scattering efficiency of the strained surface were regarded as reasons for the non-monotonic relation between whitening level and strain. |
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