Determination of Fracture Toughness<i>J</i>Ic Under Quasi-Static and Dynamic Loading Conditions Using Wedge Loaded Specimens

AbstractA study of the variation of fracture toughness of American Iron and Steel Institute (AISI) 1045 (Unified Numbering System [UNS] G10450) steel in the annealed condition, which exhibits elastic-plastic behavior at the crack tip, with loading rates ranging from quasi-static to dynamic conditions was undertaken. A wedge loaded compact tension (WLCT) specimen geometry was used in both testing conditions. The onset of crack propagation was detected using a strain gage mounted near the crack tip. The fracture parameter JIc decreases by about 50% when the loading rate ˙KI increases from 0.5 to about 106 MPa · m½ s−1. The measured values of JIc using WLCT specimens were confirmed from previous data on this material using standardized three-point bending specimens as well as from evaluation of JIc from stretch zone width measurements using scanning electron microscopy of the fracture surface of the WLCT specimens.

Determination of Fracture ToughnessJIc Under Quasi-Static and Dynamic Loading Conditions Using Wedge Loaded Specimens Journal Articles