Propagation of a transient shear wave from a crack in an elastic plate

Bassim, M.N.; Wassef, Wafik A.

doi:10.1007/bf00036180

Cited by 1 publication

(1 citation statement)

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“…Previous authors [1][2][3][4][5][6][7][8][9] have estimated SZW and SZD and attempted to establish a correlation with the initiation fracture toughness of materials. Typical correlation of J with the SZW 5 can be expressed as J~2k tan bs f SZW : : : : : : : : : : :…”

Section: Introductionmentioning

confidence: 99%

Initiation fracture toughness of HSLA steel through automatic measurement of stretch zone

Tarafder

Dey

Dash

et al. 2004

Materials Science and Technology

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Stretch zones are formed due to crack tip blunting in ductile materials before the initiation of a crack. Using special edge detection filters, an automatic measurement procedure based on image analysis (IA) for estimating stretch zone dimensions has been proposed. The in house developed software based on the proposed technique requires only fractographic images to automatically define stretch zone boundaries. Employing the proposed technique, stretch zone measurements were carried out on a high strength low alloy (HSLA) steel. The initiation fracture toughness of this HSLA steel has been estimated using these stretch zone dimensions. A comparison of measured stretch zone dimensions with the crack tip blunting region of the fracture resistance curve revealed that the blunting behaviour is non-linear and the data range normally considered for constructing the blunting line is inadequate to represent this non-linearity for these steels. Prediction of initiation fracture toughness (J i ) in high strength, high toughness materials therefore requires blunting line estimation from a modified data range. An upper bound blunting line data range is proposed for accurate prediction of Da cr (SZW) and J i . The results of this study indicate that the IA technique can be used effectively for accurate determination of SZW, SZD, J i , and J Q . It is also noted that for materials with non-linear blunting behaviour, SZW is a better parameter than SZD for predicting J i and J Q . MST/6138

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