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Q: What is orowan theory of failure of material due to fatigue?
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Bilinear s-n curve theory?

Bilinear S-N curve theory is a fatigue life prediction model that considers two different slopes of the stress-life curve to account for the crack initiation and crack propagation phases of fatigue failure. The model assumes that different materials have different fatigue behaviors and can be accurately described by two linear segments. It helps in estimating the number of cycles to failure under alternating stress conditions.


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What theory of failure is used for ductile materials?

For ductile materials, teh VonMises theory is used; it combines tension and shear stresses in a different way than principal stress, which is used for brittle materials. In either case, its value is compared to the normal (tension/compression) stress allowable for the particular material.


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Max principle stress theory is valid for which material?

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