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CONTENTS
Volume 9, Number 5, October 2020
 

Abstract
The present investigation is concerned with two-dimensional deformation in a homogeneous isotropic non local thermoelastic solid with two temperatures due to thermomechanical sources. The theory of memory dependent derivatives has been used for the study. The bounding surface is subjected to concentrated and distributed sources (mechanical and thermal sources). The Laplace and Fourier transforms have been used for obtaining the solution to the problem in the transformed domain. The analytical expressions for displacement components, stress components and conductive temperature are obtained in the transformed domain. For obtaining the results in the physical domain, numerical inversion technique has been applied. Numerical simulated results have been depicted graphically for explaining the effects of nonlocal parameter on the components of displacements, stresses and conductive temperature. Some special cases have also been deduced from the present study. The results obtained in the investigation should be useful for new material designers, researchers and physicists working in the field of nonlocal material sciences.

Key Words
thermoelasticity; nonlocality; nonlocal theory of thermoelasticity; Eringen model of nonlocal theories; two temperature; memory dependent derivative; concentrated and distributed sources

Address
Parveen Lata: Department of Basic and applied Sciences, Punjabi University Patiala, India
Sukhveer Singh: Punjabi University APS Neighbourhood Campus, Dehla Seehan, India

Abstract
This research is devoted to the study of plane wave propagation in homogeneous transversely isotropic (HTI) magneto-thermoelastic rotating medium with combined effect of Hall current and two temperature due to multidual- phase lag heat transfer. It is analysed that, for 2-D assumed model, three types of coupled longitudinal waves (quasi-longitudinal, quasi-transverse and quasi-thermal) are present. The wave characteristics like phase velocity, specific loss, attenuation coefficients, energy ratios, penetration depths and amplitude ratios of transmitted and reflected waves are computed numerically and illustrated graphically and compared for different theories of thermoelasticity. Some particular cases are also derived from this research.

Key Words
transversely isotropic; magneto-thermoelastic; rotation; multi-dual-phase lag heat transfer; hall current; two temperature; plane wave propagation

Address
Parveen Lata, Iqbal Kaur: Department of Basic and Applied Sciences, Punjabi University, Patiala, Punjab, India
Kulvinder Singh: Kurukshetra University Kurukshetra, Haryana, India

Abstract
In-place analysis for offshore platforms is essentially required to make proper design for new structures and true assessment for existing structures. The structural integrity of platform components under the maximum and minimum operating loads of environmental conditions is required for risk assessment and inspection plan development. In-place analyses have been executed to check that the structural member with all appurtenances robustness and capability to support the applied loads in either storm condition or operating condition. A nonlinear finite element analysis is adopted for the platform structure above the seabed and the pile-soil interaction to estimate the in-place behavior of a typical fixed offshore platform. The analysis includes interpretation of dynamic design parameters based on the available site-specific data, together with foundation design recommendations for in-place loading conditions. The SACS software is utilized to calculate the natural frequencies of the model and to obtain the response of platform joints according to in-place analysis then the stresses at selected members, as well as their nodal displacements. The directions of environmental loads and water depth variations have important effects on the results of the in-place analysis behavior. The result shows that the in-place analysis is quite crucial for safe design and operation of offshore platform and assessment for existing offshore structures.

Key Words
FEM; offshore platform; storm condition; pile soil interaction; in-place analysis

Address
Shehata E. Abdel Raheem: Civil Engineering Department, Faculty of Engineering, Assuit University, Assiut 71516, Egypt
Elsayed M. Abdel Aal: Egypt Gas Company, Alexandria. Egypt
Aly G.A. AbdelShafy: Civil Engineering Department, Faculty of Engineering, Assuit University, Assiut 71516, Egypt
Mahmoud H. Mansour: Civil Engineering Department, Faculty of Engineering, Assuit University, Assiut 71516, Egypt
Mohamed Omar: Civil Engineering Department, Faculty of Engineering, Aswan University, Aswan, Egypt

Abstract
This paper presents the results of the study of vertically natural frequency of tractor tires are effected by changing different ground contacts and inflation pressures using the Free Decay Method. The results show that the natural frequencies of the tire are not affected while the vertical acceleration increased strongly due to the increase of inflation pressure when the tire performs free decay vibration on rigid ground. In addition, the number of natural frequency peaks of the tire also increases with increasing tire inflation pressure. On the other hand, the natural frequencies of the tractor tire increases strongly while the vertical acceleration decreases slightly with the increase of tire inflation pressure as the tire performs free decay vibration on soft soil. Further, the natural frequencies of tire–soil system are always higher than that of tire only, and it changed with changing the soil depth. Results also show the natural frequency of tire and tire–soil system is in the range of 3.0 to 10.0 Hz that lie within the most critical natural frequency range of the human body. These findings have to be mentioned and used as design parameters of the tractor suspension system.

Key Words
tractor tire; inflation pressure; natural frequency; decay method; FFT

Address
Do Minh Cuong: Department of Mechanical Engineering, University of Agriculture and Forestry, Hue University,
102 Phung Hung, Hue city, Vietnam
Zhu Sihong: College of Engineering, Nanjing Agricultural University, Nanjing 210031, PR China

Abstract
This paper presents a careful theoretical investigation into interfacial stresses in reinforced concrete foundation beam repairing with composite plate. The essential issue in the analysis of reinforced structures with composite materials is to understand the individual behaviour of each material and its interaction with the remaining ones. The present model is based on equilibrium and deformations compatibility requirements in and all parts of the repaired RC foundation beam, i.e., the reinforced concrete foundation beam, the composite plate and the adhesive layer. The theoretical predictions are compared with other existing solutions, By comparisons between the existing solutions and the present new solution enable a clear appreciation of the effects of various parameters such as the geometric characteristics and mechanical properties of the components of the repaired beam, as well as the geotechnical stresses of the soil are considered. This research is helpful for the understanding on mechanical behaviour of the interface and design of the composite-concrete hybrid structures.

Key Words
RC foundations beam; interfacial stresses; repair of structures; composite plates

Address
Rabahi Abderezak, Tahar Hassaine Daouadji and Benferhat Rabia: Laboratory of Geomatics and sustainable development, University of Tiaret, Algeria


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