Abstract:
The four-point bending (4PB) test of notched specimens made of a low alloy steel (WCF-62) was carried out at different loading rates at -100℃. The local cleavage fracture stress
σf was measured. The Influence of loading rate on fracture behavior of the notched specimens was investigated. It is found that at a low loading rate
v≤10 mm/min,
σf is about 1100 MPa, while at a high loading rate
v ≥ 120 mm/min,
σf is about 700 MPa. The change of
σf is caused by the change of critical events with loading rate, and if the critical events are identical,
σf does not vary with loading rate. When the loading rate is about 30 mm/min the notch toughness decrease sharply with the rising of loading rate due to an abrupt change of
σf.
點擊查看大圖
下載:
