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Publications (19)
An elastic-perfectly plastic middle crack tension aluminum 2024-T3 alloy were used under plane stress,plane strain and 3D analysis to determine stabilized crack-opening stresses for different R-ratios and stress levels.The stabilized crack-opening stresses of a 3D analysis locates between those values of plane stress and plane strain conditions.Usi...
Abrasion in pipelines and fluid transfer equipment along with impurities in oil and gas and other industrial processes is one of the most important problems of oil, gas and petrochemical industries. Repair of this equipment is considered as one of the major challenges in industry. Wearing was created by the impact of solid particles with gas and li...
2 اصفْبى صٌؼتی داًـگبُ-هکبًیک داًـکذُ چکیذٌ تیش دیٌبهیکی سفتبس تحقیق دسایي غیشخغی دس پیضٍالکتشیک کَپلیٌگ ثب داسای پیضٍالکتشیک تیش ػبصُ گیشد. هی قشاس ثشسػی هَسد پبیذاس ؿشایظ غیشخغی پیچـی ٍ خوـی استؼبؿبت ٍجَد ثب هیشایی ػبصُ ایي ٍ ثبؿذ هی اػت. ؿذُ ٍاقغ ّبسهًَیک تحشیک...
1] يه ا٘شطب ثشداؿت وشدٖ ٔبوضيٕٓ سٚؽ وشد. پیـٟٙبد ايی ػبصٜ پبسأتشٞبب وشدٖ ثٟیٙٝ ثٛػیّٝ سا ا٘شطب ٔٙجغ پیضٚاِىتشيه ػیؼتٓ ا٘شطب ثشداؿت اص تبصّٝ یٛاٖ ّیُ ی سٚؽ آٟ٘ب ٕٞىبسا٘ؾ ٚ وشد٘ذ.ٌبٔبیٛ٘ی اسائٝ سا [2] ثشداؿت وشدٖ ٔبوضيٕٓ سٚؽ فشوب٘غ اص اب ذٚدٜ ٔ ثشاب ا٘شطب ٚ اِٛيٗ و...
2 ، حمید دکتر میردامادی رضا 3 3 هکبًیک، اصفْبى/داًطکذُ صٌؼتی داًطگبُ jabbari_nik@yahoo.com 2 هکبًیک، اصفْبى/داًطکذُ صٌؼتی داًطگبُ ghayour@cc.iut.ac.ir 1 هکبًیک، اصفْبى/داًطکذُ صٌؼتی داًطگبُ hrmirdamadi@cc.iut.ac.ir چکیده هقبلِ ايي یش يکسیشدس یییش اص اًیشطب بشداضیت بیشاب سٍضیی اسائِ بِ شُ ...
A variety of parameters influence the performance of piezoelectric sensors and actuators, such as support and concentrated mass. This paper presents a finite element formulation for piezoelectric structures and studies the effect of parameters on them. This method was developed based on the Bernoulli-Euler beam and the model is considered for use a...
Needle graphite electrodes are one of the main parts used in electric arc furnaces. These electrodes have a significant impact on melt quality and product quality, and their consumption is one of the most important parameters of steel production cost in EAF furnaces. Therefore, reducing the consumption of needle graphite electrodes in these furnace...
The graphite electrodes consumed in an arc furnace account for a major portion of steel production costs; hence, the costs associated with steel production may be reduced by reducing electrode consumption. Proper coating of electrodes is one solution, among the many others developed in the course of arc furnace evolution, that might reduce electrod...
Today, there is a rapid growing demand for graphite electrodes used at steel making factories. Graphite electrodes are expensive materials that are used at steel making factories. Increasing the working longevity of these materials can significantly improve the benefit of steel melting process. Therefore, the increase in the stability of graphite a...
This paper presents to verify the energy harvesting of a nonlinear piezoelectric multilayer beam under harmonic excitation. For getting the perfect performance in energy harvesting, the effect of the energy loss factor, resistive load, and excitation frequency are studied on the results of the power and voltage generated. In this paper, a numerical...
The energy harvesting of a piezoelectric cantilever beam is obtained from the excitation of vibration modes. Vibration modes have strain nodes where the strain distribution changes in the direction of the beam length. Covering the strain nodes of the vibration modes with continuous electrodes effects a cancellation of the voltages outputs. The use...
This paper presents a method of design for the energy harvesting of a piezoelectric cantilever beam. Vibration modes have strain nodes where the strain distribution changes in the direction of the beam length. Covering the strain nodes of the vibration modes with continuous electrodes effects a cancellation of the voltages outputs. The use of segme...
This paper presents a finite element formulation for the dynamics analysis of the steady and transient states of a nonlinear piezoelectric beam. A piezoelectric beam with damping is studied under harmonic excitation. A numerical method is used for this analysis. In the paper, the central difference formula of four order is used and compared with th...
This paper presents a numerical formulation and experimental implementation for the dynamics behavior verification of the nonlinear piezoelectric beam through harmonic excitation. The NPBDA program is developed with Matlab software. To verify the NPBDA results, the experimental results are used for the vibration analysis of a piezoelectric beam to...
The present study was carried out to examine the effectiveness of an addition of triethylaluminium to tert ‐butyl perpivalate which is frequently used in industrial applications for initiating the copolymerisation of ethylene with vinyl acetate. For this purpose, polymerisation tests were carried out in the laboratory on a continuous basis at 1900...