Journal
POLYMER TESTING
Volume 59, Issue -, Pages 29-37Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2016.12.025
Keywords
Residual stress; Polymer; Hole drilling method; Polycarbonate; Quenching
Funding
- Institute of Materials Engineering - Polymer Technology of the University of Kassel, within the LOEWE research cluster safer materials
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The current work introduces a procedure to locally measure residual stresses in polymers. For this purpose, the hole drilling method was adapted to the prevailing boundary conditions. Particular attention is given to the analysis of the measured strain signal which is time dependent and strongly influenced by local temperature fluctuations. The different sources of heat prevailing during the measurement and their impact are outlined. By thorough analysis of the viscoelastic and thermal deformation occurring during and after drilling the material, a procedure is proposed to measure the correct strain relaxation from which residual stresses can be calculated. Using quenched polycarbonate samples with known residual stress profiles, the potential of the proposed approach was demonstrated and is discussed. (C) 2017 Elsevier Ltd. All rights reserved.
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