Abstract
Abstract Foamed polystyrene extrusion sheet is often post-formed at reasonably warm temperatures for various final applications. Modified Erichsen testing apparatus with heating chamber is used for evaluating temperature dependence of post-forming ability of foamed polystyrene sheet. Circular sheets (90 mm diameter) of thickness (1.5 mm-2.4 mm) are used as test specimen in this experiment. The fracture of sheet specimen at hemi-spherical punch corner can be observed through upper glass plate during the punch penetration travel. Profile of holding die, thickness of test specimen and clamping conditions (neat fit, press fit and clearance fit) of sheet specimen between dies are varied in this experiment and their effects on the fracture penetration depth are investigated at various working temperatures (30-100°C) with the interval of 10°C. In general, Erichsen fracture values increase greatly with working temperatures. While the effect of clamping conditions are not clear, Erichsen fracture values increase w...
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