A.R Shahani - Professor, Faculty of Mechanical Engineering, K.N. Toosi University of Technology, ۱۹۳۹۵-۱۹۹۹, Tehran, Iran
M Baghaee - MSc Student, Faculty of Mechanical Engineering, K.N. Toosi University of Technology, ۱۹۳۹۵-۱۹۹۹, Tehran, Iran
H Shooshtar - Ph.D. Student, Faculty of Mechanical Engineering, K.N. Toosi University of Technology, ۱۹۳۹۵-۱۹۹۹, Tehran, Iran

This study is on the use of J-integral approach for fracture toughness testing of elastomeric materials. At themoment, multiple specimen test method is the most commonly used method for elastomeric materials. However, thistest method requires a large number of samples to be tested, and it is costly and time-consuming. Single specimenmethod has the advantage that there is no need to test many samples but there is a lack of adequate research in thisfield. The main challenge with this method is how to extract the  factor. Few previous studies for determination of indicate that it is merely geometry dependent like metals. In this Research, the selected specimen geometry is a doubleedge-notched tension (DENT) sample, which is a very popular sample. In contrast to the previous investigations, bothour experimental and numerical results show that extracted  values are completely dependent on the material and theloading level along with the geometry. Also, It is shown that the constant * claimed for the DENT specimen in theliterature is not correct and there is a variation of 42% relative to the type of material.

Rubber, J integral, single specimen method, double-edge-notched tension