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Growing Science » Authors » M.R.M. Aliha

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Sort articles by: Volume | Date | Most Rates | Most Views | Reviews | Alphabet
1.

Determination of fracture parameters for a bi-material center cracked plate subjected to biaxial loading using FEOD method Pages 117-124 Right click to download the paper Download PDF

Authors: Atefeh Mousavi, M.R.M. Aliha

DOI: 10.5267/j.esm.2016.2.002

Keywords: bi-material center crack plate stress field, FEOD, fracture parameters

Abstract:
Fracture parameters of a bi-material plate containing a cener crack and subjected to biaxial tensile loading was calculated numerically. Based on the crack tip stress field obtained numerically in a bi-material joint and using the finite element over deterministic (FEOD) method, the stress intensity factors (KI and KII) and also non-singular T-stress terms, were determined for different material properties and biaxial loading cases. Due to asymmetry of loading and material properties in the investigated dissimilar plate, the center crack experinces mixed mode I/II fracture in general. By increasing the bi-material constant value, which shows the difference between the mechanical properties of two materials, the amplitude of stress intensity factor decreases. The obtained results from this method were in good agreement with the displacment field method prevousiuly reported by other researchers.
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Journal: ESM | Year: 2016 | Volume: 4 | Issue: 3 | Views: 379 | Reviews: 0

 
2.

The microstructure and mechanical behavior of modern high temperature alloys Pages 1-20 Right click to download the paper Download PDF

Authors: A.T. Samaei, M.M. Mirsayar, M.R.M. Aliha

Keywords: High Entropy Alloy, Mechanical Properties, Phase Stability, Structure-Property Relation

Abstract:
Over the past decades, high entropy alloys (HEAs) have attracted continuously increasing research efforts because of their technological promise for structural applications and their scientific interest as a multi-component alloy exhibiting an overall random solid solution structure with high mixing entropy at high temperature. In this summary, we briefly review the recent studies focused on the structure and mechanical behavior of HEAs, covering the important issues from phase stability to elastic modulus, mechanical strength, hardness and fatigue resistance. Finally, we highlight a few key findings recently reported for HEAs and discuss the outstanding issues yet to be resolved.
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Journal: ESM | Year: 2015 | Volume: 3 | Issue: 1 | Views: 1555 | Reviews: 0

 
3.

Crack growth path prediction for the angled cracked plate using higher order terms of Williams series expansion Pages 77-84 Right click to download the paper Download PDF

Authors: S. Nasiraldin Mirlohi, M.R.M. Aliha

Keywords: Crack growth path, Higher order terms, Maximum tangential stress criterion, Mixed Mode, Williams series

Abstract:
The amount of damage induced by brittle fracture of cracked bodies depends considerably on the path of fractures. Therefore, prediction of the trajectory of fracture using suitable theoretical fracture criteria is very important for cracked structures. In this paper, using higher-order terms of Williams’s series expansion and the maximum tangential stress criterion, the mixed mode I/II crack growth path of an angled crack plate subjected to biaxial far field loading is investigated theoretically. To evaluate the accuracy of the theoretical results, they are compared with the experimentally reported trajectories for the angled crack plate specimen. It is shown that by taking into account the higher order terms of the Williams series expansion a very good agreement is observed between the experimental and theoretical mixed mode fracture paths in the angled crack problem. It was also observed that the theoretically determined initial angle of crack growth is consistent with the experimental results.
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Journal: ESM | Year: 2013 | Volume: 1 | Issue: 3 | Views: 1343 | Reviews: 0

 
4.

Determination of permissible defect size for solid axles loaded under fully-reversed rotating bending Pages 27-36 Right click to download the paper Download PDF

Authors: A.R. Torabi, M.R.M. Aliha

DOI: 10.5267/j.esm.2013.06.003

Keywords: Defect, Crack growth, C35 steel, Fatigue, Four-point bending, Fracture Mechanics

Abstract:
The aim of the present work was to develop a guideline for approving the railway axles made of C35 steel and containing surface and/or in-body defects after manufacturing. First, several through and part-through circular cracks were modeled on the surface and in the body of the axle at its critical cross-section. Then, the permissible size of such cracks was determined by using the fracture mechanics. To verify the validity of the guideline, the theoretical result for the semi-circular surface crack was compared with the allowable size prescribed by the international railway standard. A very good agreement was found to exist between the predicted and the standard values.
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Journal: ESM | Year: 2013 | Volume: 1 | Issue: 1 | Views: 2755 | Reviews: 0

 

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