Photoelastic study of a center-cracked plate – The lateral load effects

In this paper, the method of photoelasticity is used to study the effect of biaxial loading on isochromatic fringe patterns around a central crack in a plate. First, utilizing the mathematical relations of isochromatic fringes, the effects of a load parallel to the crack direction on the shape and size of the fringes are studied. Since the parallel-to-the crack load affects mainly the T-stress, a method is used to calculate the T-stress directly from the photoelastic test results. In order to evaluate the analytical results, a photoelastic test program is performed on a cruciform cracked specimen. The results of these experiments are used to study the effect of parallel-to-the-crack load on the isochromatic fringe patterns. The T-stress calculated from the experimental data is compared with the results obtained from finite element analysis. It is shown that there is a good correlation between the experimental and numerical results.

[1]  Majid R. Ayatollahi,et al.  Determination of T-stress from finite element analysis for mode I and mixed mode I/II loading , 1998 .

[2]  J. F. Kalthoff.  Modes of dynamic shear failure in solids , 2000 .

[3]  G. C. Sih,et al.  On the westergaard method of crack analysis , 1966 .

[4]  M. Pavier,et al.  Mode I cracks subjected to large T-stresses , 2002 .

[5]  Harold Liebowitz,et al.  The effects of biaxial loading on the fracture characteristics of several engineering materials , 1986 .

[6]  Robert J. Sanford,et al.  Determining fracture parameters with full-field optical methods , 1989 .

[7]  B. Zuccarello,et al.  The influence of the quarter wave plates in automated photoelasticity , 2002 .

[8]  Satyandra K. Gupta,et al.  Evaluation of stress field parameters in fracture mechanics by photoelasticity—Revisited , 1997 .

[9]  Eann A. Patterson,et al.  DETERMINATION OF PREDOMINANTLY MODE II STRESS INTENSITY FACTORS FROM ISOCHROMATIC DATA , 1993 .

[10]  J. C. Radon,et al.  Fracture trajectories in a biaxially stressed plate , 1976 .

[11]  Harold Liebowitz,et al.  Load biaxiality and fracture - Synthesis and summary , 1990 .

[12]  A. J. Carlsson,et al.  Influence of non-singular stress terms and specimen geometry on small-scale yielding at crack tips in elastic-plastic materials , 1973 .

[13]  W. F. Riley,et al.  Experimental stress analysis , 1978 .

[14]  K. J. Miller,et al.  An elastic-plastic finite element analysis of crack tip fields under biaxial loading conditions , 1974 .

[15]  F. París,et al.  Photoelastic determination ofKIandKII: A numerical study on experimental data , 1997 .

[16]  M. Guagliano,et al.  Photoelastic methods to determine KI, KII and KIII of internal cracks subjected to mixed mode loading , 2006 .

[17]  G. Ravichandran,et al.  Crack initiation in brittle solids under multiaxial compression , 2003 .

[18]  Ekman,et al.  Complex fracture parameters for an interface crack between twohardening materials: a photoelastic study , 2000 .

[19]  J. W. Hancock,et al.  J-Dominance of short cracks in tension and bending , 1991 .

[20]  R. J. Sanford,et al.  A general method for determining mixed-mode stress intensity factors from isochromatic fringe patterns , 1979 .