Distortion Induced Fatigue is fatigue caused by what?

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Study for the FHWA Bridge Inspection Techniques for NSTM exam. Prepare using flashcards, detailed explanations, and multiple-choice questions. Get equipped to excel in your certification!

Multiple Choice

Distortion Induced Fatigue is fatigue caused by what?

Explanation:
Distortion-induced fatigue happens when distortion of a member or its connections under load creates secondary, alternating forces. These secondary forces are not the primary bending or torsional stresses you’d normally analyze, but arise from how the member warps, twists, or deflects under restraint and geometry of the connection. The resulting fluctuating stresses often concentrate at welds, bolts, or stiffeners and drive fatigue damage even if the main bending moment or torsion isn’t extreme. Thermal cycles and pure torsional effects aren’t the primary cause in this mechanism, which is why fatigue from secondary forces is the correct concept.

Distortion-induced fatigue happens when distortion of a member or its connections under load creates secondary, alternating forces. These secondary forces are not the primary bending or torsional stresses you’d normally analyze, but arise from how the member warps, twists, or deflects under restraint and geometry of the connection. The resulting fluctuating stresses often concentrate at welds, bolts, or stiffeners and drive fatigue damage even if the main bending moment or torsion isn’t extreme. Thermal cycles and pure torsional effects aren’t the primary cause in this mechanism, which is why fatigue from secondary forces is the correct concept.

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