Stress Intensity Factors In Plates Research Articles

Determination of modes I and II stress intensity factors for oblique single edge cracks subjected to tension

A semi-theoretical and experimental approach is employed herein to investigate plates with 90, 75, 60, 45 and 30° oblique single edge cracks subjected to tensile loading. A series of tension tests were performed and the effect of the variation of the length of the cracks on the stress intensity factors were studied. Experimental measurements show that the mode one and two stress intensity factors are related mainly to the size of the caustic (optical singularity measured on a screen at a distance Z 0 from the screen), the length and the angle of the crack, and the width of the specimen. The calculated values of the semi-theoretical stress intensity factors were corroborated with the theoretical results; and then the method was further utilized to investigate more complicated oblique edge cracks subjected to tension. In particular, the stress intensity factors of plates with oblique 45° equal parallel edge cracks were studied by this method and the results were checked with the stress intensity factors of single oblique edge cracks.

A semi-theoretical and experimental approach for the determination of the stress intensity factors

The stress intensity factors for plexiglass plates containing edge cracks and subjected to either pure bending or tension are determined herein. The method of investigation was based on a semi-theoretical and experimental approach, where the stress intensity factors are expressed in terms of the measured diameter of the caustic, the crack length, and the width of the specimen. First, two basic crack arrangements (single and double edge cracks) were studied and then the method was utilized for the investigation of more complicated crack arrangements which are difficult or maybe impossible to be investigated otherwise. In particular, the stress intensity factor for plates having a sharp V-notch of various angles θ, and semi-infinite plates containing equal parallel edge cracks subjected to pure bending and tension respectively, were investigated in order to verify the validity of this method.

Analysis of Stress Intensity Factors of Plates Containing an Arbitrary Array of Line and Branched Cracks

Analysis of Stress Intensity Factors of Plates Containing an Arbitrary Array of Line and Branched Cracks

Analysis of Stress Intensity Factors of Plates Containing Internal Cracks

Analysis of Stress Intensity Factors of Plates Containing Internal Cracks

Analysis of Stress Intensity Factors for Plates Containing Random Array of Cracks

This paper presents a general method of stress analysis of cracked wide plates subjected to plane stresses at infinity. Geometric and other parameters may be arbitrarily specified, including the number, locations, directions and lengths of the cracks as well as the stress parameters. The stress function is first assumed as the sum of stress functions having singulariteies within the cracks and at infinity, and the unknown parameters are determined from the boundary conditions using a perturbation technique. Then the stress intensity factors at all the crack tips are given by power series formulae, and they are considered to give practivaly exact values so far as the enclosing circles of all the cracks are not so close to each other. Numerical examples are given for several typical cases of practical importance.

Analysis of Stress Intensity Factors for Plates Containing Randomly Distributed Cracks

Analysis of Stress Intensity Factors for Plates Containing Randomly Distributed Cracks

An Experimental Investigation of the Crack Tip Stress Intensity Factors in Plates Under Cylindrical Bending

This experimental study was undertaken to investigate the validity of the theory based on the crack tip stress intensity factors to explain the fracture of thin cracked plates subjected to static bending moments. Plexiglas sheets were used as specimens and the loading was pure cylindrical bending. The results indicate that there is in fact a critical value of the stress intensity factor at which the crack starts growing. It was found that, while in static tensile tests the crack growth was unstable, in the case of bending, the external load (here, the bending moment) which starts the crack growing is not sufficient for the complete fracture of the plate if it is maintained constant. That is, when the critical value of the stress intensity factor is reached, the crack starts growing on the tensile side of the plate whereupon the crack tip takes a triangular shape and the system again becomes stable. In order to make the crack grow further, a considerable increase in the load is required.