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The Equivalent Material Concept: Application to failure of O-notches

The novel equivalent material concept, proposed originally by the author, was utilized together with the mean stress and the point stress failure concepts to predict the load-carrying capacity of O-notched ductile steel plates under pure tension. | The Equivalent Material Concept Application to failure of O-notches Engineering Solid Mechanics 1 2013 129-140 Contents lists available at GrowingScience Engineering Solid Mechanics homepage www.GrowingScience.com esm The Equivalent Material Concept Application to failure of O-notches A.R. Torabi Fracture Research Laboratory Faculty of New Science and Technologies University of Tehran P.O. Box 13741-4395 Tehran Iran ART ICLE INFO ABSTRACT Article history The novel equivalent material concept proposed originally by the author was utilized together Received March 20 2013 with the mean stress and the point stress failure concepts to predict the load-carrying capacity Received in Revised form of O-notched ductile steel plates under pure tension. Unlike for V and U-notches it was found September 14 2013 that the point stress criterion combined with the equivalent material concept could estimate Accepted 18 September 2013 Available online successfully the limited available experimental results reported in literature regarding four O- 18 September 2013 notched plates made of very ductile steel. By using the model one may predict well the onset of Keywords tensile crack initiation in O-notched ductile components without requiring performing Equivalent material concept experiments or elastic-plastic analysis. O-notch Crack emanation Ductile material Load-bearing capacity Ultimate tensile strength 2013 Growing Science Ltd. All rights reserved. 1. Introduction Notches are employed in engineering components and structures because of their special design requirements. Various shapes of notches can be seen in structural elements that a large number of which are V U and O-shaped. For example one can remember the V and U-shaped threads in screws and O-shaped holes in riveted and bolted connections. Between all of the notch features O-notches are probably the most widespread in mechanical engineering design. An O-notch is in fact a discontinuity which concentrates stresses around