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Combined Loading Fatigue

This video provides a focused guide on analyzing Combined Loading Fatigue problems. When a component is subjected to a mix of axial, bending, and shear stresses—some dynamic (alternating) and some static (mean)—traditional fatigue methods don't apply directly. ________________________________________ What You'll Learn: • Understanding Combined Stresses: How alternating and mean normal stresses (σx, σy, σz) interact with alternating and mean shear stresses (τxy, τyz, τzx) at a critical point. • The Power of Von Mises Stress: We demonstrate how to effectively use the Von Mises stress (σvon) as an equivalent uniaxial stress to simplify complex multiaxial stress states into a single value suitable for fatigue analysis. • Solving the Problem: Learn the concise steps to calculate both the alternating Von Mises stress (σ'a) and the mean Von Mises stress (σ'm), enabling you to use standard mean-stress fatigue criteria (like Modified Goodman) for final life prediction.