Evaluation Of J Integral Of A Compact Tension Specimen By Using Finite Element Analysis Technique For Fracture Toughness Assesment
The Finite Element Analysis (FEA) of a Compact Specimen (CT Specimen) is carried out and presented in this
work, for Fracture-toughness assessment. The criterion for the fracture toughness assessment of the CT specimen is chosen
to be J-Integral, as its direct calculation provides the fracture toughness of the material. The material used for this
investigation is Low Alloy Steel, and the Young’s Modulus and the Poisson’s ratio are assumed to be constant throughout
the investigation. The analysis is carried out using ANSYS 14.5. FE analysis is performed at different displacement loading
conditions and the values of J-integral at these loads are obtained. The J-integral value is obtained for 10 contours, and the
fifth contour value is considered. Comparison is made between the obtained FE values and ASTM standard values, which
are obtained by experimental investigations. It is shown that the two set of values obtained are in close conformance with
each other. This study has been further extended to investigate the fracture behavior of two more materials viz., aluminum
7050-T6 and allegheny ludlum altemp A286.
Keywords— CT-specimen, J-integral, Aluminium alloy, Allegheney Ludlum Altemp.