Strength, Fatigue & Materials
Every strength, fatigue & materials calculator on CalcEngines — each with its formula, a worked example, the standard it follows and the assumptions it makes.
6 calculators in this section
- Fatigue Endurance Limit and S-N Curve CalculatorS_e′ = 0.5·S_ut capped at 700 for steel, all five Marin factors, the S-N line read both ways, and Goodman, Gerber, Soderberg and ASME-elliptic on one cycle — with aluminium's lack of any endurance limit treated as the point rather than a footnote.
- Hertzian Contact Stress CalculatorContact pressure, patch size and approach for spheres, cylinders and crossed cylinders — with a concave surface entering as a negative radius, and the subsurface shear peak found where it actually is.
- Impact and Shock Load Factor CalculatorThe impact factor from energy — exactly 2 for a suddenly applied load, 1 + √(1 + 2h/δ) for a dropped one — with the same member computed stiffer two ways, because one helps and the other makes it worse.
- Mohr’s Circle and Principal Stress CalculatorPrincipal stresses, the principal angle and BOTH maximum shears — in-plane and absolute — from a plane stress state or a full three-dimensional one, with the third principal stress carried explicitly because in plane stress it is zero rather than absent.
- Thermal Stress Calculatorσ = E·α·ΔT derived rather than quoted — and the fact that it does not depend on length or on cross-section, which is why thermal stress surprises people. Plus partial restraint, where length comes back, and the bonded pair.
- von Mises and Failure Criteria Calculatorvon Mises and Tresca side by side for a ductile material, maximum normal stress and Coulomb–Mohr for a brittle one — with the 0.577 shear yield derived, and the material class asked first because it decides which criterion is applicable at all.