9-Elevated Temp & Fracture

Fatigue failure rotating beam fatigue testing machine

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Unformatted text preview: l Cyclic Loading Fatigue Failure Rotating Beam Fatigue Testing Machine Changing Stress State Created in Test Stress (S) versus Number of Cycles (N) Variations in the Level of Cyclic Stress, Stress State, and Cyclic Waveform Initiation Micromechanism of Fatigue in Smooth Surface Controlled Crack Growth Rate Testing Crack Length as a Function of Stress Cycles Yields Crack Growth Rate (da/dN) Slope of a-N Curve Fatigue Crack Growth Rate versus Crack Driving Force or Crack Stress Intensity Factor Kmax – Kmin = ΔK da = A ΔK m dN da = A ΔK m dN dN = da A ΔK m N = ∫ dN = ∫ Nf = da A ΔK m ⎡ ⎤ 1 1 ⎢ ⎥ − m m ⎢ ( m− 2) / 2 ( m− 2) / 2 ⎥ ( m − 2)AY Δσ ⎣ ao af ⎦ 2...
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This document was uploaded on 02/27/2014 for the course NANO 108 at UCSD.

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