Summary Report on Metal Processing Research.

Gurney, F. J.; Martorell, Ivan Antonio

doi:10.21236/ada093306

Cited by 1 publication

(2 citation statements)

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“…On the other hand, the mechanism operating in the ferrite/pearlite low carbon steels of this field is not clear; although the most probable failure mechanism is the striation formation, the reason why the results are situated outside the D (ductile) field is not understood. This trend is consistent with the suggestion made by Gurney [40] and Maddox [41] that the m-value decreases as the yield strength increases. 4 are constructed from Fig.…”

Section: K Tanakasupporting

confidence: 93%

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A correlation of ?K th-value with the exponent, m, in the equation of fatigue crack growth for various steels

Tanaka¹

1979

Int J Fract

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A B S T R A C T Literature (mainly in Japan) relating to fatigue-crack-growth-data at R = 0 in an air environment for a wide range of steels is reviewed with particular attention to the threshold stress intensity, AKth. The collected data are analyzed in terms of the exponent, m(the slope of the linear portion of the log(da/dN)-logAK relationship) by taking account of microstructure, material strength, fracture toughness and specimen thickness. The mean rate of fatigue crack growth for ductile steels in the range from the intermediate growth rate to threshold level and the relevant threshold values at R = 0, AKth0, can be represented as daldN = 1.700 x 10-4(AK/103.6) m -10 -6 and AKth0 = 103.6(5.88 x 10-3) |/m, where (da/dN) and AK are measured by the units of mm/cycle and kgf/mm 3/2, respectively. Contrary to this, in the case of extremely brittle steels with K~c-Value below 200 kgf/mm m (the fracture occurs by the intergranular separation), the relationships are given by da/dN = 2.893 × 10-~(AK/49.94) m -2.5 x 10 -7 and AKtb0 = 49.94(8.64 × 10-;) lira. dal d N = C{AKI(1 -R)~} m -C A K~o,where AKth0 is the threshold value at R = 0 and 3' is a material parameter. From (1), the threshold stress intensity at an arbitrary value of R may be obtained as ( l -R)VAKth0. The v-value in (1) is strongly influenced by microstructure and environment [1,6].

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Section: K Tanakasupporting

confidence: 93%

“…The different fields mapped in Fig. Actually their data [40,41] are positioned within the field. 5 in correspondence with the different fields.…”

Section: K Tanakamentioning

confidence: 99%