The von mises plastically deformed enclave as heat source for running cracks

 
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The von mises plastically deformed enclave as heat source for running cracks (EN)

Kourkoulis, SK (EN)
Theocaris, PS (EN)
Andrianopoulos, NP (EN)

N/A (EN)

All existing models interrelating crack propagation characteristic properties with heat exchange in zones around the crack tips simulate the heat production area by simple geometrical forms, like circles or squares. They assume also constant heat production rates over the whole area or the source. Contrariwise, the model introduced in the present study is based on two improved and more realistic assumptions concerning the shape and dimensions of the heat source and the spatial distribution of heat production density inside the heat source. These assumptions, together with Roscnthal's moving-point-source solution, yield a reasonable and improved model for a fast and rather simple numerical approach, whose results are in agreement with existing experimental evidence. The method was applied to two different materials, one polymer (polycarbonate) and the other metal (aluminum alloy) and their results appear to he compatible with reality and concordant with respective experiments In addition, the method was applied to relatively high crack propagation velocities revealing the existence of two symmetric off-axis temperat lire extrema in cither side of the crack propagation axis. This behavior may be directly relaled lo the phenomenon of crack branching. where similar maxima of energies and directions of branching are systematically observed at the same velocities. © 1991. (EN)

journalArticle

FRACTURE (EN)
TIP (EN)

Εθνικό Μετσόβιο Πολυτεχνείο (EL)
National Technical University of Athens (EN)

International Journal of Solids and Structures (EN)

1992


PERGAMON-ELSEVIER SCIENCE LTD (EN)



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