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CONTENTS
Volume 11, Number 3, June 2022
 


Abstract
The present paper deals with the axisymmetric deformation in homogeneous isotropic thermoelastic solid with two temperatures, with and without energy dissipation using modified couple stress theory. The effect of energy dissipation and two temperature is studied due to the concentrated normal force, normal force over the circular region, thermal point source and thermal source over the circular region. The Laplace and Hankel transform techniques have been used to find the solution to the problem. The displacement components, conductive temperature distribution, stress components and couple stress are computed in the transformed domain and further calculated in the physical domain using numerical inversion techniques. Effects of two temperature and energy dissipation on the conductive temperature, stress components and couple stress are depicted graphically.

Key Words
energy dissipation; isotropic thermoelastic solid; Laplace and Hankel transform; modified couple stress theory; two temperature

Address
Parveen Lata and Harpreet Kaur: Department of Basic and Applied Sciences, Punjabi University, Patiala, Punjab, India

Abstract
The present paper is concerned with a delamination analysis of a multilayered frame structure that exhibits non-linear creep behavior. A solution to the strain energy release rate is obtained by considering the time-dependent complementary strain energy in the frame. The mechanical behavior of the frame is treated by using a non-linear stressstrain- time relationship. The time-dependent solution to the strain energy release rate obtained in the present paper holds for a multilayered frame made of arbitrary number of adhesively bonded layers of different thicknesses and material properties. Besides, the dealamination is located arbitrary along the thickness. The solution to the strain energy release rate is verified by applying the J-integral approach. A parametric study of the strain energy release rate is carriedout. Two three-layered frame configurations are analyzed in order to evaluate the influence of the delamination crack location along the thickness on the strain energy release rate. The strain energy release is analyzed also for the case when a notch is cut-out in the inner delamination crack arm. The results obtained are compared with these for a frame without a notch.

Key Words
delamination; frame structure; multilayered material; non-linear creep; notch

Address
Victor I. Rizov: Department of Technical Mechanics, University of Architecture, Civil Engineering and Geodesy,
1 Chr. Smirnensky Blvd., 1046 - Sofia, Bulgaria
Holm Altenbach: Lehrstuhl für Technische Mechanik, Fakultät für Maschinenbau, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Deutschland

Abstract
This work presents a comparative study between two different models: trapezoidal and T-shaped combined footings. The comparative study between trapezoidal and T-shaped combined footings presented in this paper generates results that have an unparalleled accuracy for all foundation engineering problems. The main part of this research is to obtain the optimal area, reinforcing steel, and thickness of the trapezoidal and T-shaped combined footings using the new models. The comparison is made for two trapezoidal combined footings and two T-shaped combined footings of reinforced concrete subjected to the same load. The main findings are: the model for trapezoidal combined footings can be used for rectangular and triangular, and the T-shaped combined footings can be used for rectangular. The structure of the paper is as follows first a very complete state of the art with extensive references that describes the methodology used for the different models clearly, presents different numerical examples, results and at the end conclusions.

Key Words
bending shear; design; moments; optimal area; punching shear; T-shaped combined footings; trapezoidal combined footings

Address
Marylú García-Galván, Arnulfo Luévanos-Rojas, Sandra López-Chavarría, Manuel Medina-Elizondo and José Benito Rivera-Mendoza: Institute of Multidisciplinary Researches, Autonomous University of Coahuila, Blvd. Revolución No, 151 Ote, CP 27000, Torreón, Coahuila, México

Abstract
Non-Traditional Optimization methods are successfully used in solving many engineering problems. Shaft is one of important element of machines and it is used to transmit power from a machine which produces power to a machine which absorbs power. In this paper, ten non-traditional optimization methods that are ALO, GWO, DA, FPA, FA, WOA, CSO, PSO, BA and GSA are used to find minimum weight of hollow shaft to get global optimal solution. The problem has two design variables and two inequality constraints. The comparative results show that the Particle Swarm Optimization outperforms other methods and the results are validated using ANSYS.

Key Words
ANSYS; hollow shaft; Non-Traditional Optimization; weight minimization

Address
J. Rejula Mercy: Department of Mathematics, Karunya Institute of Technology and Sciences, Coimbatore, India; Department of Mathematics, PSGR Krishnammal College for Women, Coimbatore, India
S. Elizabeth Amudhini Stephen, K. Rebecca Jebaseeli Edna: Department of Mathematics, Karunya Institute of Technology and Sciences, Coimbatore, India

Abstract
Due to the high usage of ABS in industries, such as aerospace, auto, recreational devices, boat, submarines, etc., the purpose of this project was to find a way to weld this material, which gives advantages, such as affordable, high speed, and good connection quality. In this experimental project, the friction welding method was applied with parameters such as numerical control (NC) machine with two different speeds and three cross-sections, including a flat surface, cone, and step. After the end of the welding process, samples were then applied for both tensile and bending tests of materials, and the results showed that, with increasing the machining velocity Considering of samples, the friction of the surface increased and then caused to increase in the surface temperature. Considering mentioned contents, the melting temperature of composite materials increased. This can give a chance to have a better combination of Nanomaterial to base melted materials. Thus, the result showed that, with increasing the weight percentage (wt %) of Nanomaterials contents, and machining velocity, the mechanical behavior of welded area for all three types of samples were just increased. This enhancement is due to the better melting process on the welded area of different Nano contents; also, the results showed that the shape of the welding area could play a significant role, and by changing the shape, the results also changed drastically. A better shape for the welding process was dedicated to the step surface.

Key Words
ABS; bending; cone shape; flat shape; friction welding; frictional joint of polymer; Nano Sio2; Nano Zno; polymer welding; step shape; tensile

Address
Mohammad Afzali and Yasser Rostamiyan: Department of Mechanical Engineering, Sari Branch, Islamic Azad University, Sari, Iran


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