Mechanical Metallurgy |
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Page 194
... crack spreads . Griffith established the following criterion for the propagation of a crack : A crack will propagate when the decrease in elastic strain energy is at least equal to the energy required to create the new crack surface ...
... crack spreads . Griffith established the following criterion for the propagation of a crack : A crack will propagate when the decrease in elastic strain energy is at least equal to the energy required to create the new crack surface ...
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 3 35678OORE | 3 |
Stress and Strain Relationships for Elastic Behavior | 17 |
Elements of the Theory of Plasticity | 54 |
Copyright | |
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alloys aluminum angle annealed ASTM axis behavior bending billet brittle fracture Burgers vector cent compressive constant crack creep rate decrease determined diameter direction dislocation line distribution drawing ductile edge dislocation effect elastic elongation equation extrusion factor failure fatigue limit flow curve flow stress force forging forming friction given grain boundaries hardness high-temperature increase indentation lattice length load longitudinal mandrel martensite material maximum measured mechanical metallurgical Metals Park method modulus notch obtained occurs orientation particles plastic deformation pressure principal stresses Proc produced properties punch quenched radius ratio reduction of area region relationship residual stresses rolling screw dislocations shear stress sheet shows single crystals slip plane Society for Metals specimen steel strain energy strain hardening strain rate stress-strain curve structure surface temper tensile strength tensile stress theory thickness tion torsion Trans transition temperature tube yield strength yield stress στ