Preliminary results are reported of temperature variations in fatigue pre-cracked compact tension spoecimen of AISI 316, subjected to a uniformly increasing cross-head displacement. The temperature variations in the regions surrounding the crack tip are sensed by three point-like thermistors. At the thermoelasto-plastic instability the load vs. time characteristic exhibits a barely perceptible kink. Conversely, the initial thermoelastic cooling is followed by a sudden temperature rise near the crack tip and a delayed, smoother rise at greater distances. This experimental procedure, based on 'thermal emissionì, allows one to identify wuth precision the formation and development of the plastic zone.
Temperature variations around the crack tip during a fracture test
BEGHI, MARCO;BOTTANI, CARLO ENRICO;CAGLIOTI, GIUSEPPE
1984-01-01
Abstract
Preliminary results are reported of temperature variations in fatigue pre-cracked compact tension spoecimen of AISI 316, subjected to a uniformly increasing cross-head displacement. The temperature variations in the regions surrounding the crack tip are sensed by three point-like thermistors. At the thermoelasto-plastic instability the load vs. time characteristic exhibits a barely perceptible kink. Conversely, the initial thermoelastic cooling is followed by a sudden temperature rise near the crack tip and a delayed, smoother rise at greater distances. This experimental procedure, based on 'thermal emissionì, allows one to identify wuth precision the formation and development of the plastic zone.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
