Thermoelasticity Center of Excellence (TCE)

 

Director: H. Basirat Tabrizi

 

Secretary: Mehri heidari

 

Adds: Mech. Eng. Dept. P.O. Box 15875-4413

Amirkabir University of Technology

Tel: 0098-21-64543459

Fax: 0098-21-66492879

Email: thermoelasticity@aut.ac.ir

Web adds. : http://me.aut.ac.ir/excellence/thermo.c.e.htm

 

Thermoelasticity

 

With the emergence of advanced technology and modern processes, many machines and structures experience extreme thermal environments, resulting in various types of thermal loads. This situation has created a need for investigation focused on the analysis of thermal stresses. Since 2005, the Ministry of Science, Research and Technology of Iran has assigned Department of Mechanical Engineering (DME) to focus on this field. Members of the center are   faculties of DME and from other University with the largest number of publications in this area.

The object of this center is to survey the present extent of these studies, both qualitative, with special emphasis on factors that may be helpful to the designer and practicing engineer in avoiding the deleterious effects of thermal stress. The members of the Thermaoelasticity Center of Excellence (TCE) are appointed by the Ministry of Science, Research and Technology are as follows:

 

 

Professor M.R.  Eslami (Amirkabir University)  

 

 

Professor  M.  Shakeri (Amirkabir University)

 

 

 

 

Professor M. Akhlaghi (Amirkabir University)

Professor S.Fariborz (Amirkabir University)

Associate Professor M. Mohammadi Aghdam (Amirkabir University)

 

 

 

 

Professor M.H. Yas  (Razi University)

 

 

 

 

 Associate Professor A.A.Beigloo  (Modares University)

 

 

 

 

Professor A.Ghorbanpour Arani (Kashan University)

 

 

 

 

            Thermal stress is the stress caused by the change of temperature in a body. When a continuum is subjected to a temperature gradient, it may deform non-uniformly. To enable the body to remain continuous, a system of thermal strains and associated thermal stresses are produced which are dependent on the shape of the body and its temperature distribution. Thermal stress may result even in cases of uniform temperature distribution if free deformation is prevented by external constraints, if one part consists of several materials having different coefficients of expansion, or if in homogeneities in the microstructure of the material are present.

The thermal stresses alone or in combination of mechanical stresses produced by the external forces can give rise to the nucleation of defect and eventual failure of structures.

            Some ductile materials behave like brittle ones due to the application of abrupt thermal stress in an unsteady state temperature field; it is said that they cannot withstand thermal shock. The repeated action of thermal stresses leads to thermal fatigue in machine parts. Thermal stresses may even result in plastic strains leading to complete or progressive destruction of the structure. In thin-walled structures, thermal effects may yield thermal buckling.

Although brittle materials may fail in one cycle of application of thermal stress, ductile materials usually withstand repeated cycles of applied stress before failure. Failure under repetitive application of thermal stress has been termed thermal stress fatigue.

The aim of the members of TCE is to enhance the knowledge of thermal effects in structures and to provide consultant for respective industries.

The areas of research field are defined so far as follows:

1.      Generalized coupled thermoelasticity of layers weakened by defects.

2.      Thermoelastic analysis using the Green- Naghdi, Lord-Shulman ، model

3.      Diffusion bonding between a reactive metal and austenitic stainless steel

4.      Study on welding residual stresses in large pressure vessel

5.      Thermo-Elassto-Viscoplasticity of semisolid materials

6.      Design and installation of a test rig for plate under dynamic and Thermal loads.

                 

     Laboratories - TCE