1/28/2002 Remember: Turn in your homework WEDNESDAY before class start.

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CHE 333 Class 18 Fracture of Materials.

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CHE 333 Class 18 Fracture of Materials.

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1/28/2002 Remember: Turn in your homework WEDNESDAY before class start.

Failure criterions Brittle fracture Ductile fracture

Mohr circle

Pure bending failure

Simple torsion failure

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Void coalescence

Analysis of the cup-cone fracture in a round tensile bar V. Tvergaard The Technical University of Denmark A.Needleman Brown University Acta Metallurgica, 1984

More things to know… 1.Tensor 2.Finite element analysis 3.Void nucleation criterion, Gurson’s model 4.Element-vanish-technique

Failure process in the neck of a round tensile specimen of copper

Crack growth