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- 저자 : Javad Jafari Fesharaki (검색결과 2 건)
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Javad Jafari Fesharaki,Sa'id Golabi 국제구조공학회 2016 Smart Structures and Systems, An International Jou Vol.17 No.5
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.
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Mohammad Javad Kabiri Renani,Javad Jafari Fesharaki 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.1
In this paper a new regression relation for nonlinear ultimate buckling resistance of the cones with rectangular cutouts is presented. For this purpose, the eff ective geometry parameters and material properties such as the length, thickness, large diameter and angle of the cone, the length, width and location of cutout, the modulus of elasticity, yield stress and plastic properties are considered. Then using response surface method, 288 design of experiment is considered and a regression relation for predict the ultimate buckling resistance is proposed. To validate the results, two types of real experiment are presented and the results show that there is good agreement between the experimental tests and proposed relation. Then the eff ects of changing the various parameters on the ultimate buckling resistance of the cone are investigated. The results show that locating the cutout near the large diameter of the cone has more infl uence than locating near the small diameter. Also, the location of cutout has more infl uence at higher thickness. Also, the yield stress has more infl uence on ultimate buckling resistance at higher values of thickness. In addition, decreasing the length of the cone or increasing the diameter of the cone increase the ultimate buckling resistance and increasing the angle of cone decrease the ultimate buckling resistance of the cone
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