A new fracture test specimen is suggested and analyzed using finite element method. The mode I and mode II stress intensity factors as well as the T-stress were calculated for three geometries and loading conditions. | A new mixed mode fracture test specimen covering positive and negative values of T-stress Engineering Solid Mechanics 2 2014 67-72 Contents lists available at GrowingScience Engineering Solid Mechanics homepage esm A new mixed mode fracture test specimen covering positive and negative values of T-stress M. M. Mirsayar Zachry Department of Civil Engineering Texas A amp M University College Station TX 77843-3136 USA ARTICLE INFO ABSTRACT Article history A new fracture test specimen is suggested and analyzed using finite element method. The mode Received September 20 2013 I and mode II stress intensity factors as well as the T-stress were calculated for three geometries Received in Revised form and loading conditions. It is shown that the specimen called single edge cracked ring SECR October 14 2013 covers different mixed mode loading conditions from pure mode I to pure mode II. The SECR Accepted 22 February 2014 Available online specimen also covers negative and positive values of T-stresses. From the practical view point 25 February 2014 the suggested specimen can be used easily for mixed mode II fracture tests. Keywords Brittle fracture mechanics SECR specimen Mixed mode loading conditions T-stress Numerical analyses 2014 Growing Science Ltd. All rights reserved. 1. Introduction In many industrial and engineering structures mixed mode brittle fracture is the major reason for the catastrophic failures. In order to study the mixed mode brittle fracture one can employ theoretical fracture criteria Erdogan amp Sih 1963 Sih 1974 Hussain et al. 1974 Smith et al. 2000 Gomez et al. 2009 Ayatollahi amp Aliha 2011 or experimental approaches. Researchers usually use laboratory specimens because that the fracture experiments on real components may be difficult or expensive. A suitable laboratory specimen should be able to provide real state of the stress field adjacent the crack tip and also cover all mixed mode loading conditions from pure mode I KII
