crack growth parameters for carbon and alloy steel
crack growth parameters for carbon and alloy steel
(OP)
Does anyone know crack growth parameters (C and m) values for Carbon steels and alloy steels?
Both Carbon and alloy steels have high strength, over 70 ksi yield and over 90 ksi tensile strength
Thank you
Both Carbon and alloy steels have high strength, over 70 ksi yield and over 90 ksi tensile strength
Thank you





RE: crack growth parameters for carbon and alloy steel
da/dN = C (ΔK)m
Some worst-case numbers according to Barsom and Rolfe:
Microstructure C m
Ferritic-pearlitic 6.89 x 10-9 3.0
Martensitic 1.36 x 10-7 2.25
Austenitic 5.61 x 10-9 3.25
R = 0
Units for C: (mm/cycle)/(MPa√m)m
Reference: Barson and Rolfe, Fracture and Fatigue Control in Structures, 1987, Prentice-Hall
RE: crack growth parameters for carbon and alloy steel
Since I am only a structural engineer, I do not have too much info regarding the types of steels (ferritic, austentic, martensitic etc). How should I find out the type of carbon and alloy steels? Can we say they are martensitic since their yield strength is higher than 70 ksi?
Thank you again.
RE: crack growth parameters for carbon and alloy steel
RE: crack growth parameters for carbon and alloy steel
Alloy - Material Test Report - 1
Grade: 4130R
Normalization Temperature: 1650 F (899 C)
Quench Temperature: 1600 F (871C)
Chemical Analysis:
C: 0.31
Mn: 0.55
P: 0.009
S: 0.011
Si: 0.25
Cu: 0.22
Ni: 0.07
Cr: 0.92
Mo: 0.178
Sn: 0.007
V: 0.002
Carbon - Material Test Report - 1
Grade: 1035R
Chemical Analysis:
C: 0.34
Mn: 0.81
P: 0.006
S: 0.014
Si: 0.24
Cu: 0.22
Ni: 0.08
Cr: 0.13
Mo: 0.024
Sn: 0.007
V: 0.001
Grain size: Fine grain (Meets or exceeds grain size 5)
RE: crack growth parameters for carbon and alloy steel
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For the low alloy, you could try to conduct an internet search for starters.