Search Results - "M. Ayatollahi"

ISRM-Suggested Method for Determining the Mode I Static Fracture Toughness Using Semi-Circular Bend Specimen by Kuruppu, M. D., Obara, Y., Ayatollahi, M. R., Chong, K. P., Funatsu, T.

“…The International Society for Rock Mechanics has so far developed two standard methods for the determination of static fracture toughness of rock. They used…”
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Size and Geometry Effects on Rock Fracture Toughness: Mode I Fracture by Ayatollahi, M. R., Akbardoost, J.

“…In this paper, the effects of specimen size and geometry on the apparent mode I fracture toughness ( K c ) of an Iranian white marble (Neyriz) are studied. A…”
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A new fixture for fracture tests under mixed mode I/III loading by Ayatollahi, M.R., Saboori, Behnam

“…In this paper, a new loading fixture is suggested for exploring mixed mode I/III fracture experimentally. Then, the advantages of the fracture test…”
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An over-deterministic method for calculation of coefficients of crack tip asymptotic field from finite element analysis by AYATOLLAHI, M. R., NEJATI, M.

“…ABSTRACT An over‐deterministic method has been employed for calculating the stress intensity factors (SIFs) as well as the coefficients of the higher‐order…”
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Experimental and theoretical investigation of the influence of post-curing on mixed mode fracture properties of 3d-printed polymer samples by Bahrami, Bahador, Talebi, Hossein, Momeni, M. M., Ayatollahi, M. R.

“…This study explores the mechanical properties and fracture characteristics of additively manufactured acrylonitrile butadiene styrene specimens, focusing on…”
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Brittle failure of inclined key-hole notches in isostatic graphite under in-plane mixed mode loading by Lazzarin, P., Berto, F., Ayatollahi, M. R.

“…ABSTRACT In the present contribution, the fracture behaviour of specimens made of isostatic graphite and weakened by inclined key‐hole notches is investigated…”
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Mode II fracture tests on asphalt concrete at different temperatures using semi-circular bend specimen loaded by various types of supports by Pirmohammad, S., Abdi, M., Ayatollahi, M.R.

“…•Roller, roller-in-groove and fixed supports are used to perform fracture tests.•Experiments are conducted at five different low and intermediate…”
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Multiple mixed-mode cracks in a magneto-electro-elastic half-plane under in-plane loading by Ayatollahi, M., Nourazar, M.

“…•Mixed mode analysis is carried out in magneto-electro-elastic half-plane with multiple cracks.•Generalized distributed dislocation technique is used to…”
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Mixed mode brittle fracture of sharp and blunt V-notches in polycrystalline graphite by Ayatollahi, M.R., Berto, F., Lazzarin, P.

“…Brittle fracture of polycrystalline graphite is studied experimentally and theoretically using Brazilian disk specimens containing sharp and rounded-tip…”
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Brittle fracture of sharp and blunt V-notches in isostatic graphite under pure compression loading by Berto, F., Lazzarin, P., Ayatollahi, M.R.

“…Brittle failure of isostatic polycrystalline graphite under pure compression loading is investigated experimentally by using prismatic specimens weakened by…”
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An improved semi-circular bend specimen for investigating mixed mode brittle fracture by Ayatollahi, M.R., Aliha, M.R.M., Saghafi, H.

“…An edge cracked semi-circular specimen subjected to asymmetric three-point bend loading was suggested for investigating mixed mode fracture in brittle…”
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Size-dependent fracture behavior of Guiting limestone under mixed mode loading by Akbardoost, J., Ayatollahi, M.R., Aliha, M.R.M., Pavier, M.J., Smith, D.J.

“…The effect of specimen size on mixed mode fracture resistance of a sedimentary soft rock (Guiting limestone) has been investigated. Two types of specimen have…”
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Effect of multi-walled carbon nanotube aspect ratio on mechanical and electrical properties of epoxy-based nanocomposites by Ayatollahi, M.R., Shadlou, S., Shokrieh, M.M., Chitsazzadeh, M.

“…The effects of the aspect ratio of multi-walled carbon nanotube (MWNT) on the mechanical and electrical properties of epoxy/MWNT nanocomposites were studied…”
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On the use of Brazilian disc specimen for calculating mixed mode I–II fracture toughness of rock materials by Ayatollahi, M.R., Aliha, M.R.M.

“…The centrally cracked Brazilian disc specimen has been used frequently in the past for investigating mixed mode I–II fracture toughness in rock materials…”
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Determination of NSIFs and coefficients of higher order terms for sharp notches using finite element method by Ayatollahi, M.R., Nejati, M.

“…An overdeterministic method was used for calculating the Notch Stress Intensity Factors (NSIFs) as well as the coefficients of the higher order terms for…”
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Application of Cracked Triangular Specimen Subjected to Three-Point Bending for Investigating Fracture Behavior of Rock Materials by Aliha, M. R. M., Hosseinpour, Gh. R., Ayatollahi, M. R.

“…Numerical and experimental studies were performed on a new fracture test configuration called the edge cracked triangular (ECT) specimen. Using several…”
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Mixed mode analysis of multiple cracks in magneto-electro-elastic plane by Nourazar, M., Ayatollahi, M.

“…•Mixed mode analysis is carried out in magneto-electro-elastic plane with multiple cracks.•Generalized distributed dislocation technique is used to construct…”
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Tensile fracture in notched polycrystalline graphite specimens by Ayatollahi, M.R., Torabi, A.R.

“…Brittle fracture was studied experimentally and theoretically for a polycrystalline graphite using samples containing rounded-tip V-notches. Three different…”
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Brittle fracture of sharp and blunt V-notches in isostatic graphite under torsion loading by Berto, F., Lazzarin, P., Ayatollahi, M.R.

“…Brittle fracture of polycrystalline graphite under torsion loading is studied experimentally and theoretically using axisymmetric specimens weakened by sharp…”
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Finite element simulation of nano-indentation experiment on aluminum 1100 by Karimzadeh, A., Ayatollahi, M.R., Alizadeh, M.

“…•Nano-indentation and uniaxial tensile experiments were performed on aluminum 1100.•Young’s modulus values measured from the two test methods were in very good…”
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