The threshold stress intensity factor, Kth, for sub-critical crack growth of borosilicate glass was measured in water environment using the interrupted static fatigue test. Bending tests with durations ranging from 1 h to 50 days were performed. Around 15 specimens were tested at each condition and the constant stress applied varied from 70 to 95 MPa. The stress intensity factor, Kw, applied to the weakest surviving sample during the stress hold was calculated as a function of the dwell time. Kw was seen to decrease with the hold time until an invariant stress intensity factor corresponding to the fatigue limit (Kth≈0.26-0.29 MPa√m) was reached for durations larger than 10 days.
Fatigue Limit in Borosilicate Glass by Interrupted Static Fatigue Test
Sglavo, Vincenzo Maria;
1999-01-01
Abstract
The threshold stress intensity factor, Kth, for sub-critical crack growth of borosilicate glass was measured in water environment using the interrupted static fatigue test. Bending tests with durations ranging from 1 h to 50 days were performed. Around 15 specimens were tested at each condition and the constant stress applied varied from 70 to 95 MPa. The stress intensity factor, Kw, applied to the weakest surviving sample during the stress hold was calculated as a function of the dwell time. Kw was seen to decrease with the hold time until an invariant stress intensity factor corresponding to the fatigue limit (Kth≈0.26-0.29 MPa√m) was reached for durations larger than 10 days.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione
