METALLURGY AND MATERIALS ENGINEERING MODULE V AND VI S3 KTU NOTES [SECOND YEAR]

METALLURGY AND MATERIALS ENGINEERING 

MODULE V & VI 

FAILURE



 A component looses its “Engineering Functionality”


 Need not be a Fracture (fragmentation) always


 CAUSES


 Improper materials selection


 Improper processing


 Inadequate design of the component


 Misuse.




FRACTURE



Simple fracture is the separation of a body into two or more pieces.


 In response to an imposed stress that is static (i.e.,


constant or slowly changing with time) and


 At temperatures that are low relative to the melting


temperature of the material.


 The applied stress may be tensile, compressive, shear, or


torsional


 Steps in fracture


crack formation


crack propagation


TYPES OF FRACTURE


 Depending on the ability of material to undergo plastic


deformation before the fracture two fracture modes can be


1. Ductile fracture




2. Brittle fracture

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