Fracture Mechanics of Metals: Some Features of Crack Initiation and Crack Propagation

Krasowsky, A. J.

doi:10.1007/978-94-010-0656-9_12

Cited by 6 publications

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“…Fundamental information on the K µ -model is given elsewhere. [13][14][15][16] The mathematical expression of this model is given by…”

Section: An Assessment Of the Fracture Toughness Of A Material K Icmentioning

confidence: 99%

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Study on ASTM E399 and ASTM E1921 standards

Said

2006

Fatigue Fract Eng Mat Struct

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A B S T R A C T Costs of ASTM E399 and ASTM E1921 tests, which were developed to determine the fracture toughness (K Ic ) and the ductile-brittle transition temperature of ferritic steels, respectively, are considered high and the procedures are also very complicated. In this study, a method, which is more cost-effective and easier to carry out, is proposed.Keywords fracture toughness; the ductile-brittle transition temperature. N O M E N C L A T U R EB = thickness of test specimen B * * = thickness of test specimen at T * * temperature B 0 = gross thickness of test specimen (side grooves ignored) B x = thickness of the specimen to obtain the ductile-brittle transition temperature C = constant H 0 = constant with thermal activation energy unit for a certain material k = Boltzmann constant K Ic = fracture toughness K 0 IC = value of K IC at T = 0 K K * * Ic = value of K Ic at T * * temperature K Id = dynamic fracture toughness K jc (0) = K jc for a specimen of size B 0 , K jc(med) = the median value of fracture toughness obtained by J-Integral.K min = 20 MPa (m) 1/2 . m = temperature sensitivity of fracture toughness n = strain hardening coefficient T = test temperature, K T k = constant temperature, K T 0 = reference temperature, K σ y (0) − σ 0 = effective value of yield stress when T = 0 Ḱ ε = plastic deformation raté ε 0 = constant with plastic deformation rate unit, depending on internal structure of material (pre-exponential factor) α = temperature sensitivity of yield strength σ c = the critical stress effective ρ c = distance from the crack tip σ y = yield strength at T temperature σ 0 = athermal part of yield strength σ * * y = yield strength at T

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“…Fundamental information on the K µ -model is given elsewhere. [13][14][15][16] The mathematical expression of this model is given by…”

Section: An Assessment Of the Fracture Toughness Of A Material K Icmentioning

confidence: 99%

“…K 0 Ic value can be determined from the test results carried out on a specimen with a crack at T * * temperature in order to eliminate the grain diameter (d) of the given material from Eq. (14). From Eq.…”

Section: An Assessment Of the Fracture Toughness Of A Material K Icmentioning

confidence: 99%