Page 248 - T. Anderson-Fracture Mechanics - Fundamentals and Applns.-CRC (2005)

1656_C005.fm Page 228 Monday, May 23, 2005 5:47 PM

228 Fracture Mechanics: Fundamentals and Applications

FIGURE 5.9 High-magnification fractograph of the ‘‘shear” region of a cup and cone fracture surface in
austenitic stainless steel. Photograph courtesy of P.T. Purtscher. Taken from Purtscher, P.T., ‘‘Micromechanisms
of Ductile Fracture and Fracture Toughness in a High Strength Austenitic Stainless Steel.” Ph.D. Dissertation,
Colorado School of Mines, Golden, CO, 1990.

Rice and Tracey solved Equation (5.10) for a variety of stress states and found that the void
growth in all cases could be approximated by the following semiempirical relationship:

 R  ε eq  . 15σ 
p
ln   = . 0 283 ∫ exp  m  dε eq (5.11)
 R  0  σ YS 
o

FIGURE 5.10 Spherical void in a solid, subject to a triaxial stress state.