Weld type dependence of S - N (wohler) curves in fatigue analysis
Weld type dependence of S - N (wohler) curves in fatigue analysis
(OP)
Good Days,
A problem that I recently come across is confusing.
As far as I know, for a certain type of material, say 1040 steel, the slope of the wohler curve is constant (3 for normal stress & 5 for shear stress), for any type of weldment. But a document that we recently obtain tells that weld type ( fillet, butt...) and quality (weld finishing, grinding...) affects not only the endurance limits, but also the slope of S-N curve.
Does anyone have an idea about this slope issue?
Thx
Serdar tekin
A problem that I recently come across is confusing.
As far as I know, for a certain type of material, say 1040 steel, the slope of the wohler curve is constant (3 for normal stress & 5 for shear stress), for any type of weldment. But a document that we recently obtain tells that weld type ( fillet, butt...) and quality (weld finishing, grinding...) affects not only the endurance limits, but also the slope of S-N curve.
Does anyone have an idea about this slope issue?
Thx
Serdar tekin






RE: Weld type dependence of S - N (wohler) curves in fatigue analysis
http://www.codigotecnico.org/index.php?id=33
download (Descargar) DB-SE A: Acero, that is the part that cares for the steel structural design and then go to Anejo C at page 147 and then to page 150 for the referred S-N figure.
RE: Weld type dependence of S - N (wohler) curves in fatigue analysis
RE: Weld type dependence of S - N (wohler) curves in fatigue analysis
"Weld location and type could affect the slope of the S-N curve"
RE: Weld type dependence of S - N (wohler) curves in fatigue analysis
RE: Weld type dependence of S - N (wohler) curves in fatigue analysis
The slope is generally 3 but the other constants used in the formulation differ for different weld types, locations, or principal stress direction. I'd refer to the appropriate standard.
corus