Abstract
ABSTRACTResidual stresses in PET preforms is thought to be an important cause in the stress cracking of blown bottles but there is no data yet that can be linked to stress and cracking. An important step in this link is the measurement of stresses in the preform base and neck region of the preforms. This paper reports on the usage of photoelastic methods to measure residual stresses in preforms. It is found that the residual stresses vary from preform to preform and how cracks develop is due to the qualitative and quantitative presence of residual stresses and its orientation.
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