J_Ic試験における側溝および板厚の影響について

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The effect of side-grooves on elastic-plastic fracture-toughness (J_<Ic>) determination of high- and medium-strength structural steels, HT80 and SM50A, was investigated by using CT-type specimens of three different thicknesses; the ratio of net thickness to gross thickness was kept at 0.75 and the net thickness was ranged from 6 to 18 mm. The J_<Ic> tests were conducted in accordance with the standard J_<Ic> test method proposed by the Japan Society of Mechanical Engineers (JSME). The use of side-grooved specimens generally made it much easier to determine the onset of ductile tearing by the R-curve method arid the electric potential method. and improved accuracy and scatter of the toughness values thus determined, provided all the size-requirements for the specimen prescribed in the JSME method were satisfied. The critical stretched zone width (SZW_c) of the side-grooved specimens was found to be smaller than that previously determined for the standard CT specimens without side-grooves. This was attributed to higher triaxiality produced by the side-grooves. The SZW_c values of the side grooved specimens were rather insensitive to the specimen thickness in the range of thickness investigated. Good agreement was observed between the J_<Ic> values at physical onset of ductile tearing and the J_<Ic> values determined by the R-curve method and the electric potential method. The stretched zone width method gave slightly larger J_<Ic>. Values than those by the R-curve method for SM50A, as has been observed for the standard specimens without side-grooves.
1984-08-15

J_Ic試験における側溝および板厚の影響について

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