Dynamic crack curving—A photoelastic evaluation

AbstractA dynamic-crack-curving criterion, which is valid under pure Mode I or combined Modes I and II loadings and which is based on either the maximum circumferential stress or minimum strain-energy-density factor at a reference distance ofr0 from the crack tip, is verified with dynamic-photoelastic experiments. Directional stability of a Mode I crack propagation is attained when $$r_o= \frac{1}{{128\pi }}(\frac{{K_r }}{{\sigma _{ox} }})^2 V_o^2 (C,C_1 ,C_2 ) > r_c $$ whererc=1.3 mm for Homalite-100 used in the dynamic-photoelastic experiments.

[1]  G. Sih,et al.  A SPECIAL THEORY OF CRACK PROPAGATION METHODS OF ANALYSIS AND SOLUTION OF CRACK PROBLEMS , 1973 .

[2]  Hussain,et al.  Strain Energy Release Rate for a Crack Under Combined Mode I and Mode II , 1974 .

[3]  B. Cotterell.  On fracture path stability in the compact tension test , 1970 .

[4]  P. Theocaris,et al.  A Modified Strain-Energy Density Criterion Applied to Crack Propagation , 1982 .

[5]  J. Tirosh.  Incipient fracture angle, fracture loci and critical stress for mixed mode loading , 1977 .

[6]  G. C. Sih,et al.  Methods of analysis and solutions of crack problems : recent developments in fracture mechanics : theory and methods of solving crack problems , 1973 .

[7]  E. Yoffe,et al.  The moving Griffith crack , 1951 .

[8]  Sia Nemat-Nasser,et al.  Energy release rate and crack kinking , 1981 .

[9]  J. Williams,et al.  Fracture under complex stress — The angled crack problem , 1972 .

[10]  J. Rice,et al.  Slightly curved or kinked cracks , 1980 .

[11]  I. Finnie,et al.  An experimental investigation of crack-path directional stability , 1980 .

[12]  A. Kobayashi,et al.  A dynamic photoelastic analysis of dynamic-tear-test specimen , 1976 .

[13]  S. Mall,et al.  Dynamic fracture toughness of Homalite-100 , 1978 .

[14]  E. Yoffe,et al.  LXXV. The moving griffith crack , 1951 .

[15]  A. Kobayashi,et al.  Dynamic Crack Curving and Crack Branching , 1983 .

[16]  Iain Finnie,et al.  A note on the angled crack problem and the directional stability of cracks , 1973, International Journal of Fracture.

[17]  Chien H. Wu.  Elasticity problems of a slender Z-crack , 1978 .

[18]  Brian Cotterell.  On brittle fracture paths , 1965 .

[19]  B. Cotterell,et al.  Notes on the paths and stability of cracks , 1966 .

[20]  W. B. Bradley,et al.  Fracture dynamics—a photoelastic investigation , 1971 .

[21]  F. Erdogan,et al.  On the Crack Extension in Plates Under Plane Loading and Transverse Shear , 1963 .

[22]  M. Williams,et al.  On the Stress Distribution at the Base of a Stationary Crack , 1956 .

[23]  A. S. Kobayashi,et al.  Crack-Propagation Rate in 7075-T6 Plates Under Cyclic Tensile and Transverse Shear Loadings , 1969 .

[24]  Leon M Keer,et al.  Crack kinking under nonsymmetric loading , 1980 .

[25]  J. Benbow,et al.  Experiments on Controlled Fractures , 1957 .

[26]  L. B. Freund,et al.  The mechanics of dynamic shear crack propagation , 1979 .

[27]  A. Kobayashi,et al.  Dynamic stress-intensity factors for unsymmetric dynamic isochromatics , 1981 .

[28]  Leon M Keer,et al.  Approximate Description of Crack Kinking and Curving , 1981 .

[29]  A. Kobayashi,et al.  Photoelastic investigation on the Crack-arrest capability of a pretensioned stiffened plate , 1975 .

[30]  W. G. Knauss,et al.  II – On the Problem of Crack Extension in Brittle Solids Under General Loading , 1978 .