MECHANICAL METALLURGY |
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Page 194
... cracks which produce a stress concentration of sufficient magnitude so C Ασ 2c- Υσ Fig . 7-3 . Griffith crack model . that the theoretical cohesive strength is reached in localized regions at a nominal stress which is well below the ...
... cracks which produce a stress concentration of sufficient magnitude so C Ασ 2c- Υσ Fig . 7-3 . Griffith crack model . that the theoretical cohesive strength is reached in localized regions at a nominal stress which is well below the ...
Page 195
... crack of length 2c . The surface energy due to the presence of the crack is Us = 4cy ( 7-9 ) The total change in potential energy resulting from the creation of the crack is AU = Us + UE ( 7-10 ) According to Griffith's criterion , the ...
... crack of length 2c . The surface energy due to the presence of the crack is Us = 4cy ( 7-9 ) The total change in potential energy resulting from the creation of the crack is AU = Us + UE ( 7-10 ) According to Griffith's criterion , the ...
Page 198
... cracks that are tenths of an inch in length or greater . The quantity of interest is the crack - extension force , also called the strain - energy release rate . The crack - extension force G , measured in units of in . - lb / in.2 , is ...
... cracks that are tenths of an inch in length or greater . The quantity of interest is the crack - extension force , also called the strain - energy release rate . The crack - extension force G , measured in units of in . - lb / in.2 , is ...
Contents
Introduction | 5 |
The Torsion Test | 10 |
Stress and Strain Relationships for Elastic Behavior | 17 |
Copyright | |
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alloys aluminum annealing ASTM axis behavior brittle fracture Burgers vector cent compressive considered constant crack decrease determined diameter dislocation line ductile edge dislocation effect elastic elongation equation factor fatigue limit fatigue properties flow curve fracture stress given grain boundaries hardness increase indentation internal friction lattice load martensite material maximum measure Metals Park modulus notch number of cycles occurs orientation particles pile-up plastic deformation principal stresses Proc produced quenched ratio recrystallization reduction of area region residual stresses resolved shear stress screw dislocations shear stress shown shows single crystals slip direction slip lines slip plane slip system Society for Metals solid solution solute atoms specimen stacking fault steel strain energy strain hardening strain rate stress concentration stress-strain curve structure surface tensile strength tensile stress tension theory tion torsion Trans twins vacancies yield point yield strength yield stress