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Computational Analysis of Stress Intensity Factors for a Single-Edge-notch Tension Specimen by a Stress Function

Nandish R V1, Niranjan Pattar1, C V Raja Reddy1, S Paul Vizhian2, and S Ramachandra3
1.Department of Mechanical Engineering, The Oxford College of Engineering, Bengaluru 560068, India
2.Department of Mechanical Engineering, University Visvesvaraya College of Engineering, Bengaluru 560001, India
3.Scientist ‘F’ Grade, Gas Turbine Research Establishment, Bengaluru 560093, India

Abstract—Cracks and flaws occur in many structures and components for several reasons. Cracks may develop during the manufacturing or later as a result of environmental conditions which can significantly degrade the structural integrity of a component under the action of applied loads. Often for the old fleet of imported aircrafts, the design data and the material data are not available. The extent of degradation of the component or system during service also has to be assessed. These issues form the basic input criteria for assessment of the damage and life extension methodology. So by determining the stress intensity factor values for different crack size in a single edge cracked specimen by theoretical and finite element method makes validation with respect to the standard problems. Since geometries with very small cracks are of particular relevance for equivalent initial flaw size, stress intensity factor values for very small cracks are of special interest, and results obtained for various crack length for the variation in load. The influence of the mesh type on the precision of the finite element method results is assessed.

Index Terms—Stress intensity factor, Fracture mechanics, Single edge notch tension, Crack

Cite: Nandish R V, Niranjan Pattar, C V Raja Reddy, S Paul Vizhian, and S Ramachandra, "Computational Analysis of Stress Intensity Factors for a Single-Edge-notch Tension Specimen by a Stress Function," International Journal of Mechanical Engineering and Robotics Research, Vol. 2, No. 4, pp. 231-238, October 2013.