Search Results - "Ayatollahi, Majid R."

Characterization of 3D-printed PLA parts with different raster orientations and printing speeds by Khosravani, Mohammad Reza, Berto, Filippo, Ayatollahi, Majid R., Reinicke, Tamara

“…Fabrication based on additive manufacturing (AM) process from a three-dimensional (3D) model has received significant attention in the past few years. Although…”
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The influence of in-plane raster angle on tensile and fracture strengths of 3D-printed PLA specimens by Ayatollahi, Majid R., Nabavi-Kivi, A., Bahrami, Bahador, Yazid Yahya, M., Khosravani, Mohammad Reza

“…•Fracture and tensile tests were performed on 3D-printed PLA samples.•Effects of in-plane raster orientation on tensile and fracture strengths were…”
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Heat treatment effects on fracture resistance of additively manufactured PLA specimens under mode I loading by Ayatollahi, Majid R., Rezaeian, Parham, Nabavi‐Kivi, Amir, Khosravani, Mohammad Reza

“…The current paper deals with the influence of heat treatment on the tensile, flexural, and fracture strength of polylactic acid (PLA) specimens made by the…”
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On the Pin-Bearing Strength of Additively Manufactured Polymer Parts by Khosravani, Mohammad Reza, Sadeghian, Hadi, Ayatollahi, Majid R, Reinicke, Tamara

“…Due to the wide scope of applications of additive manufacturing (AM) in making final products, the mechanical strength of AM parts has become very important…”
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Impact Fatigue Life of Adhesively Bonded Composite-Steel Joints Enhanced with the Bi-Adhesive Technique by Akhavan-Safar, Alireza, Eisaabadi Bozchaloei, Ghasem, Jalali, Shahin, Beygi, Reza, Ayatollahi, Majid R, da Silva, Lucas F M

“…One of the most common loading conditions that bonded joints experience in service is repeated impact. Despite the destructive effects of impact fatigue, the…”
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Effect of sintering temperature on mechanical and tribological properties of hydroxyapatite measured by nanoindentation and nanoscratch experiments by Karimzadeh, Atefeh, Ayatollahi, Majid R., Bushroa, A.R., Herliansyah, M.K.

“…The aim of this paper is to investigate the mechanical and tribological properties of a commercial hydroxyapatite (HA) by nanoindentation and nanoscratch…”
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A statistical approach on the support type effect on mode I fracture toughness determined using semi-circular bend (SCB) specimen by Sedighi, Iman, Ayatollahi, Majid R., Bahrami, Bahador

“…•Effect of support friction on mode I fracture of SCB specimen was statistically assessed.•65 fracture tests with four different types of supports were…”
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Crack tip asymptotic fields in anisotropic planes: Importance of higher order terms by Nejati, Morteza, Ghouli, Saeid, Ayatollahi, Majid R.

“…•The series expansions of crack tip fields are given for a cracked anisotropic plane.•Stress-based definitions of crack loading modes in anisotropic planes are…”
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The finite element over-deterministic method to calculate the coefficients of crack tip asymptotic fields in anisotropic planes by Ayatollahi, Majid R., Nejati, Morteza, Ghouli, Saeid

“…This article applies the finite element over-deterministic (FEOD) method to determine the coefficients of the crack tip asymptotic fields in an anisotropic…”
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Crack tip fields in anisotropic planes: a review by Ayatollahi, Majid R., Nejati, Morteza, Ghouli, Saeid

“…This paper reviews crack tip asymptotic fields in generic plane anisotropic media, rigorously categorising about 400 studies devoted to the determination of…”
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Fracture behavior of additively manufactured components: A review by Khosravani, Mohammad Reza, Berto, Filippo, Ayatollahi, Majid R., Reinicke, Tamara

“…•Overview of three-dimensional (3D) printing processes.•Analysis of reported data on the fracture of 3D-printed polymeric parts.•Review of the fracture…”
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Crack tip asymptotic field and K-dominant region for anisotropic semi-circular bend specimen by Nejati, Morteza, Ghouli, Saeid, Ayatollahi, Majid R.

“…•Coefficients of the crack tip asymptotic field are determined for the anisotropic SCB sample.•An energy-based criterion is used to evaluate the K-dominant…”
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Experimental fracture study of MWCNT/epoxy nanocomposites under the combined out-of-plane shear and tensile loading by Saboori, Behnam, Ayatollahi, Majid R.

“…In order to explore the role of multi-walled carbon nanotubes (MWCNTs) on the fracture behavior of epoxy-based nanocomposites, fracture tests were conducted…”
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Effect of printing speed on tensile and fracture behavior of ABS specimens produced by fused deposition modeling by Rezaeian, Parham, Ayatollahi, Majid R., Nabavi-Kivi, A., Razavi, Nima

“…•Effect of printing speed is studied on tensile and fracture properties of ABS specimens made by FDM.•Path of crack growth is also analyzed for specimens made…”
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T-stress effects in mixed mode I/II/III brittle fracture by Ayatollahi, Majid R., Saboori, Behnam

“…•Generalized maximum tangential stress criterion is extended to mixed mode I/II/III.•T-stress effects on fracture parameters are explored for mixed modes I/III…”
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Introduction of a Scaling Factor for Fracture Toughness Measurement of Rocks Using the Semi-circular Bend Test by Ghouli, Saeid, Bahrami, Bahador, Ayatollahi, Majid R., Driesner, Thomas, Nejati, Morteza

“…This article discusses the scale dependence of the mode I fracture toughness of rocks measured via the semi-circular bend (SCB) test. An extensive set of…”
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Mixed mode II/III fracture experiments on PMMA using a new test configuration by Ayatollahi, Majid R., Karami, Javane, Saboori, Behnam

“…A fracture test configuration recently proposed for exerting a diverse combinations of mode II and mode III loading is redesigned to attain better performance…”
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Synergistic effects of hybrid MWCNT/nanosilica on the tensile and tribological properties of woven carbon fabric epoxy composites by Moghimi Monfared, Reza, Ayatollahi, Majid R., Barbaz Isfahani, Reza

“…•Hybrid MWCNT and nanosilica was loaded into woven carbon fabric composites.•Good dispersion of nano-fillers was observed for 0.45 wt.% MWCNT + 0.45 wt.%…”
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Crack tip shielding and size effect related to parallel edge cracks under uniaxial tensile loading by Ferrian, Francesco, Cornetti, Pietro, Sapora, Alberto, Talebi, Hossein, Ayatollahi, Majid R.

“…The present work aims at investigating crack shielding and size effect related to a cracked slab under tensile loading. For this purpose, experimental tests…”
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Nanomechanical properties and wear resistance of dental restorative materials by Karimzadeh, A, Ayatollahi, Majid R, Nikkhooyifar, M, Bushroa, A.R

“…The effects of thermocycling procedure and material shade on the mechanical properties and wear resistance of resin-based dental restorative materials are…”
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