Impact Strength and Fatigue Relations?
Impact Strength and Fatigue Relations?
(OP)
I have been trying to find some good data that relates Charpy impact values to fatigue resistance. I know that the Charpy test is rarely used in a design sense, but the stubborn engineer in me keeps finding hypothetical connections between the two. If two materials have the same hardness and tensile strength, won't the one with higher Charpy values fair better in fatigue?





RE: Impact Strength and Fatigue Relations?
RE: Impact Strength and Fatigue Relations?
RE: Impact Strength and Fatigue Relations?
As an aside, the new european fatigue analysis techniques borrow heavily from BS 5500 in that they basically abandon traditional fatigue methods and favor fracture mechanics prediction of fatigue failures. They postulate that the vast majority of fatigue failures occur in the weld heat affected zone HAZ at pre-existing cracks formed during the welding process. If correct , then the charpy impact values in the HAZ, related to PWHT QC , has a strong affect on fatigue life.
RE: Impact Strength and Fatigue Relations?
Do you happen to know the name of the new european fatigue analysis technique?
RE: Impact Strength and Fatigue Relations?
EN 13445 part 3 clauses 17+18 which are aimed at using the BS5500 method of predicting failure due to weld crack propagation.
a good primer on the new european methods is at :
<www.kuleuven.ac.be/bwk/materials/Education/master/wg12/...;