By Gyoujin Cho
In the final decade there was an expanding knowledge that use of criteria deeply notched fracture mechanics try specimens can lead to large over-or-under-assessments of the true fracture sturdiness linked to shallow floor cracks.
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Additional info for Shallow crack fracture mechanics toughness tests and applications: First International Conference
Q Estimates Under Fully Yielded Conditions Under fully plastic conditions, Q can be determined from fully plastic crack solutions used in simplified engineering fracture analysis, Kumar et al. (34). The 'fully plastic' Q for a crack geometry of characteristic dimension L has the form (3), QFP = HQ (O':L; geometry, n ).  The dimensionless function H Q depends on the load J / O'oL, dimensionless groups of geometric parameters and n. In certain geometries, the stress triaxiality changes negligibly under fully yielded conditions; for these cases, a further simplification of the form in  is possible.
2. An initial blunted crack tip with a radius of 10/2, was introduced to simulate the finite strain zone. The radius of the semi-circular arc at the tip is much smaller than the outer radius of the domain (Io/A = 2 x 10-6). Using the symmetry conditions on the plane of Y = 0, a finite element mesh was generated, as shown in Fig. 3. The mesh had 40 rings of elements radially, and 28 fans of elements circumferentially, except that the first ring had 27 fans. The entire model had 1119 plane strain, reduced integration elements (29).
P. and Shih, C. , Journal of the Mechanics and Physics of Solids, Vol. 39, 1991, pp. 989-1015. (2) O'Dowd, N. P. and Shih, C. , Journal of the Mechanics and Physics of Solids, Vol. 40, 1992, pp. 939-963. (3) Shih, C. , O'Dowd, N. P. and Kirk, M. , "A Framework for Quantifying Crack Tip Constraint," 1991. To be published in ASTM-STP. (4) Li, Y. C. and Wang, T. , Scientia Sinica (Series A), Vol. 29, 1986, pp. 941-955. (5) Sharma, S. M. , Journal of the Mechanics and Physics of Solids, Vol. 39, 1991, pp.
Shallow crack fracture mechanics toughness tests and applications: First International Conference by Gyoujin Cho