Investigation Of Fracture Parameters Of Compact Tension Specimen By FEA 1 Ch.V.Sushma, 2 Dr. P. Ravinder Reddy, 3 P. Rama Lakshmi 1 P.G.Student, 2 Prof&H.O.D, 3 Asst.prof, Mechanical Engineering Dept., Chaitanya Bharathi Institute Of Technology, Hyderabad-75, AndraPradesh ,India. ABSTRACT This paper is focused on the investigation of fracture parameters like J-integral of compact tension specimen by using ANSYS finite element analysis software which plays key role to estimate fracture toughness of materials. Here controlled displacement loading is applied on CT specimen and the results compared with ASTM standards. Key wards: J-integral, Compact Tension Specimen, Controlled displacement loading. 1. INTRODUCTION The standard compact specimen is a single-edge notched and fatigue-cracked plate loaded in tension. The specimen geometry which has been used successfully is Shown in Fig.1. Compact tension specimen has been standardized by ASTM for use in experimental determination of fracture toughness of metallic materials 1,2 . Generally a clevis and pin arrangement is used to hold the specimen. The pre cracked specimen is loaded at a controlled rate, and the resulting load displacement data is recorded .Analysis of experimental data allows material fracture toughness to be determined in terms of stress intensity factor K or J-Integral. ANSYS12 includes features such as creating seam cracks, defining singularities, defining normal to the crack front and creating focused meshes. Using these features J-Integrals are estimated For CT specimen. Fig1: Compact Tension specimen 2. J-INTEGRAL To determine an energy quantity that describes the elastic-plastic behavior of materials, Rice 3 introduced a contour Integral or line integral that encloses the crack front. The two-dimensional J-integral was originally defined (see Fig.2.) Fig2: J-Integral contours around a crack surface 1587 International Journal of Engineering Research & Technology (IJERT) ISSN: 2278-0181 www.ijert.org Vol. 2 Issue 6, June - 2013 IJERTV2IS60523