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Mixed mode I/II stress intensity factors through the thickness of disc type specimens

Mode I and mode II stress intensity factors (SIFs) through the thickness of edge crack in semi circular bend (SCB) and center cracked circular disc (CCCD) specimens have been analyzed using three dimensional finite element analysis. | Mixed mode I II stress intensity factors through the thickness of disc type specimens Engineering Solid Mechanics 1 2013 119-128 Contents lists available at GrowingScience Engineering Solid Mechanics homepage www.GrowingScience.com esm Mixed mode I II stress intensity factors through the thickness of disc type specimens Amr A. Abd-Elhady Mechanical Design Department Faculty of Engineering Helwan University Cairo 11718 Egypt ART ICLE INFO ABSTRACT Article history Mode I and mode II stress intensity factors SIFs through the thickness of edge crack in semi Received March 20 2013 circular bend SCB and center cracked circular disc CCCD specimens have been analyzed Received in Revised form using three dimensional finite element analysis. The effect of the CCCD and SCB specimen September 14 2013 thickness on the through-thickness variations of SIFs has been studied. For all mode of mixity Accepted 22 September 2013 Available online the peak value of mode I SIF is found at mid plane of SCB specimen and for thin CCCD 23 October 2013 specimen while this location is shifted to be near the free surface plane in thick CCCD Keywords specimen. The variation of mode II SIF in CCCD and SCB specimens have a similar trend. Stress intensity factor Mixed mode I II SCB specimen CCCD specimen Three dimensional finite element 2013 Growing Science Ltd. All rights reserved. 1. Introduction Cracks experience a combination of two major modes of loading mode I and mode II due to arbitrary orientation of flaws relative to the overall applied loads. Two frequently employed disc type specimens are the center cracked circular disc CCCD subjected to diametral compression often called the Brazilian disc and the edge cracked semi circular bend SCB specimen subjected to three- point bend loading. The major advantages in using these two specimens are that specimens can be easily extracted from the cores of rocks materials they have a simple geometry and simple loading configuration. In addition the .