Sa’id Golabi

University of Kashan

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Javad Jafari Fesharaki

Islamic Azad University of Najafabad

A. Ghorbanpour Arani

University of Kashan

Kazem Abhary

University of South Australia

Behzad Amirsalari

Carleton University

Lee Luong

University of South Australia

Seyed Ghasem Madani

University of Kashan

Rasoul Tarkesh Esfahani

Islamic Azad University of Najafabad

Habibizadeh Ali

University of Kashan

Maryam Yazdipoor

Islamic Azad University of Najafabad

Zahra Zojaji

University of Isfahan

Cooperative Institutions

University of Kashan

Islamic Azad University of Najafabad

Isfahan University of Technology

Islamic Azad University, Tehran

University of Isfahan

Islamic Azad University, Isfahan

Amirkabir University of Technology

Shahid Bahonar University of Kerman

University of South Australia

University of Tehran

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Stress and electric potential fields in piezoelectric smart spheres

Journal of Mechanical Science and Technology (2006)

A. Ghorbanpour Arani Sa’id Golabi M. Saadatfar

Electric displacement field

10.1007/bf03027585

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Citations (21)

Determining Optimum Shear Strength of Friction Stir Spot Welding Parameters of AA1050/C10100 Joints

MANUFACTURING TECHNOLOGY (2021)

Habibizadeh Ali Mohammad Honarpisheh Sa’id Golabi

Friction stir spot welding (FSSW) is an alternative joining process mostly suitable for joining dissimilar sheets or when conventional spot welding is not applicable. In this paper, lap joint of 2 mm thickness AA1050 aluminum sheets and C10100 copper sheets using different process parameters and fixed tool geometry were investigated. Experimental plan is designed according to response surface methodology (RSM) where: tool rotation speed, plunge depth and dwell time vary between 500 and 2500 rpm, 2.1 and 3.7 mm and 0 and 8 s respectively. The main affecting and interaction process parameters are evaluated using analysis of variance (ANOVA) methodolgy. Mathematical models describing the relationship between welding parameters and shear failure load (SFL) are developed and the optimal FSSW parameters are specified. Design expert software is used for optimization of friction stir spot welding process parameters using response graphs and contour plots. With 95% confidence level, shear failure load of the dissimilar Al 1050—Cu 10100 joints are predicted using the developed empirical relations. It is found that the optimal results of the SFL is close to the optimal solution obtained from the mathematical model with less than 4% discrepancy.

Spot welding

Dwell time

Friction Stir Welding

10.21062/mft.2021.046

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Citations (7)

Semi-analytical solution of time-dependent thermomechanical creep behavior of FGM hollow spheres

Mechanics of Time-Dependent Materials (2013)

Javad Jafari Fesharaki Abbas Loghman Maryam Yazdipoor Sa’id Golabi

Stress relaxation

10.1007/s11043-013-9212-6

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Citations (12)

A novel method to specify pattern recognition of actuators for stress reduction based on Particle swarm optimization method

Smart Structures and Systems (2016)

Javad Jafari Fesharaki Sa’id Golabi

This paper is focused on stiffness ratio effect and a new method to specify the best pattern of piezoelectric patches placement around a hole in a plate under tension to reduce the stress concentration factor. To investigate the stiffness ratio effect, some different values greater and less than unity are considered. Then a python code is developed by using particle swarm optimization algorithm to specify the best locations of piezoelectric actuators around the hole for each stiffness ratio. The results show that, there is a line called "reference line" for each plate with a hole under tension, which can guide the location of actuator patches in plate to have the maximum stress concentration reduction. The reference line also specifies that actuators should be located horizontally or vertically. This reference line is located at an angle of about 65 degrees from the stress line in plate. Finally two experimental tests for two different locations of the patches with various voltages are carried out for validation of the results.

Tension (geology)

Line (geometry)

10.12989/sss.2016.17.5.725

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Citations (16)

Collision Detection for Assembly Planning Using Solid Modelling

Sa’id Golabi Kazem Abhary

Abstract Details of a method for detecting collision of two parts when one is moved along a direction are discussed in this paper. Reduced number of grid points and the rays emit from these points to detect the intersection of a moving part with a fixed part, is the main advantage of this method comparing with the previous works in the literature. The intersection of rays, sent from a plane considerably far from both parts, with the faces of moving and fixed part are detected in this methods. If any ray intersects the moving part before intersecting the fixed part, the moving part will collide with the fixed part in that direction. Determining the starting point of the rays and detecting intersection of rays with the parts are also discussed in this paper.

Regular grid

10.1115/detc98/dfm-5757

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Multi-objective optimization of stainless steel 304 tube laser forming process using GA

Engineering With Computers (2019)

Mohammadali Keshtiara Sa’id Golabi Rasoul Tarkesh Esfahani

Ovality

Process variable

10.1007/s00366-019-00814-0

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Citations (33)

Reducing stress concentration factor around a hole on a plate by piezoelectric patch

international journal of advanced design and manufacturing technology (2013)

Sa’id Golabi Javad Jafari Fesharaki

Using piezoelectric patches the stress concentration around a hole on a plate under tension is reduced and controlled. To attain the reduction in stress two placements for piezoelectric patches is investigated. The first location is top/bottom of the hole with compression induced strain and the second is left/right of the hole with tension induced strains to control the stress flow. The result for two above condition is presented for host plate and piezoelectric patches and by comparing the results the advantages of locating the piezoelectric patches to control the stress flow in the host plate is investigated. The results show that locating the piezoelectric patches at left/right of the hole, to control the stress flow and stress concentration is more effective than locating them at the top/bottom of the hole.

Tension (geology)

Flow stress

Source

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Citations (2)

Optimization of finite element model of laser forming in circular path using genetic algorithms and ANFIS

Soft Computing (2015)

Rasoul Tarkesh Esfahani Sa’id Golabi Zahra Zojaji

10.1007/s00500-015-1622-8

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Citations (17)

AUTOMATIC GENERATION OF ALL GEOMETRICALLY FEASIBLE ASSEMBLY SEQUENCES USING SOLID MODELLING

Sa’id Golabi Kazem Abhary Lee Luong

This paper presents an approach for automatic generation of all geometrically feasible assembly sequences. The method uses the solid model data of assembly and recognizes contact between planar, cylindrical and conical faces. Using the edge and face data of the assembly, a series of mathematical calculations determines the contact and principal disassembly directions of the parts in the assembly. The method also determines the global disassemblability of the parts of assembly along their principal and any other directions. Several tools have been developed, including pruning unnecessary links, to speed up the analysis and reduce geometric reasoning.

Pruning

10.1615/faim1996.720

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Finite element analysis, prediction, and optimization of residual stresses in multi-pass arc welding with experimental evaluation

The Journal of Strain Analysis for Engineering Design (2022)

Behzad Amirsalari Sa’id Golabi

Prediction and reduction of unwanted tensile Residual Stress of welded stainless-steel plates is presented in this paper. Validated finite element analysis and Artificial Neural Network (ANN) is employed to simulate and mathematically model the process, respectively. Taguchi design of experiments tool is utilized to generate input data for finite element analyses and also to choose the most accurate ANN structures. RSs are minimized using three methods: Taguchi suggestion, Comprehensive factorial search, and Particle Swarm Optimization, whose accuracy and response pace increases and decreases respectively in this order. Furthermore, adding and removing extra weld lines was proposed to reduce unwanted residual stresses by up to 50%. Finally, the shapes and amounts of results are experimentally verified using contour method and proposed novel application of roughness testing. Micro-grain structures of the welded samples were also investigated, and RSs were discussed considering metallography images.

10.1177/03093247221078637

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Citations (1)