a.Why is the radius of crack opening critical? b.Explain the crack growth from a surface crack...

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Mechanical Engineering

a.Why is the radius of crack opening critical?
b.Explain the crack growth from a surface crack and how itgrows. Why does it not need to be over half the cross sectionalsurface area to fracture?
c.Use the Hunt Library or your preferred source and research howalloying and heat treatment can reduce or worsen the expectedlife.

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1 The smaller the radius of curvature the greatest the stress concentration Near the crack tip the stresses look like Sigma K1gQ2pir5 The total stress concentration depends on the radius of curvature of crack The smaller the radius curvature greater will be the concentration Greater the radius of curvature smaller will be the stress concentration This is why radius of crack opening is critical How a crack grows is called crack propagation and this takes into account when a crack can start to grow how far it grows and what direction it goes in So when can it grow Well there are two ways to look at it First from the point of view of the stress intensity factor KI The material resists cracking with everything it has which is called its fracture toughness The crack can grow when its stress intensity See Answer

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