A study on the characteristics of fracture resistance curve of ferritic steels

Fracture resistance (J-R) curves are used for elastic-plastic fracture mech anics analyses. The specimen geometry and the reversed cyclic loading affec t the fracture resistance (J-R) curve. On the specimen geometry, The effect s of specimen size, plane size, specimen thickness, side grooving and crack length were studied. On the reversed cyclic loading, the effects of load r atio and incremental plastic displacement were studied. The results reveale d that the J-R curves increased with increasing plane size and decreased wi th increasing a/ W and the J-R curves decreased with decreasing the load ra tio and the incremental plastic displacement, respectively.