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Effect of crack curvature on stress intensity factors for ASTM standard compact tension specimens

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Abstract

The stress intensity factors (SIF) are calculated using the method of lines for the compact tension specimen in tensile and shear loading for curved crack fronts. For the purely elastic case, it was found that as the crack front curvature increases, the SIF value at the center of the specimen decreases while increasing at the surface. For higher values of crack front curvatures, the maximum value of the SIF occurs at an interior point located adjacent to the surface. A thickness average SIF was computed for parabolically applied shear loading. It is assumed that it reflects the average stress environment near the crack edge. These results were used to assess the requirements of ASTM standards E399-71 and E399-81 on the shape of crack fronts.

Résumé

On calcule les facteurs d'intensité de contraintes (FIC) en recourant à la méthode de lignes, appliquée à une éprouvette de traction compacte soumise à tension et à cisaillement, et présentant des fronts de fissuration courbes.

Dans le cas purement élastique, on a trouvé que lorsque augmente la courbure du front de la fissure, la valeur du FIC décroît au centre de l'éprouvette, mais s'accroit en surface. Pour des valeurs élevées de la courbure du front de la fissure, la valeur du FIC décroit au centre de l'éprouvette, mais s'accroit en surface. Pour des valeurs élevées de la courbure à front de fissure, une valeur maximum de FIC et obtenue en un point intérieur situé au voisinage de la surface.

On détermine une valeur moyenne du FIC sur l'épaisseur, dans le cas d'une mise en charge par cisaillement appliquée suivant une loi parabolique. En supposant que celle-ci représente une répartition type au voisinage des bords d'une fissure.

Les résultats obtenus ont été utilisés pour établir les prescriptions des normes ASTM E.399-71 et E. 399-81 sur la forme des fronts de fissuration.

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References

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Authors and Affiliations

  1. Department of Civil Engineering, Youngstown State University, 44555, Youngstown, OH, USA

    Javed Alam

  2. Department of Civil Engineering, Case Western Reserve University, 44106, Cleveland, OH, USA

    Alexander Mendelsen

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  1. Javed Alam
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  2. Alexander Mendelsen
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Alam, J., Mendelsen, A. Effect of crack curvature on stress intensity factors for ASTM standard compact tension specimens. Int J Fract 23, 317–324 (1983). https://doi.org/10.1007/BF00020698

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