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Investigation of longitudinal bending distortion of a double-side edge welded fin plate by study of plastic zones

Sudharsanam V., Narayanan C. Sathiya, Shanmugarajan B., Prakash L.

Archives of Civil and Mechanical Engineering

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2023

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Vol. 23, no. 2

art. no. e88, 2023

EN

The Okerblom’s theory of double-side welded structures states that the resultant longitudinal bending distortion will not be zero in structures that are welded with equal heat input on both the sides of centre of gravity axis, on account of smaller plastically deformed zone near the second weld. However, investigations have not been performed thus far in exploring why such a phenomenon happens. This is the gap that this research work addresses. Accordingly, investigations were made by performing welding on both the edges of a rectangular fin plate using gas metal arc welding (GMAW) both by experimentation and by finite element (FE) simulation using SYSWELD software. Von Mises stress plots and transient strain plots of few elements near the first and second edge of the fin plate were analysed to study their relative influence in causing the plastic deformation of the elements. The analysis showed that the smaller size of the plastic zone formed near the second edge weld was mainly due to the presence of residual tensile strain on the second side elements, formed as result of the weld laid on the first edge of the fin plate.

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The Impact of Geometry on the Mechanical Stability of Plates for Internal Bone Fixation

Pervan Nedim, Mešić Elmedin, Metović Sađit, Muminović Adis J., Lulić Haris

Advances in Science and Technology. Research Journal

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2023

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Vol. 17, no 4

262--270

EN

The aim of this work is to investigate the impact of geometry on the mechanical stability of characteristic structural solutions of plates for internal bone fixation using the finite element method (FEM). Based on the realistic construction of plates for internal bone fixation, 3D geometric and FEM models were formed, and then structural analysis was carried out in the CAD/CAE system CATIA V5. Five different types of plates for internal bone fixation were tested under two types of loads: axial pressure and torque in the case of application to the femur. During the structural analysis, stresses and displacements were monitored at characteristic points of the structure. The most attention was paid to the relative displacements of the bone model fragments, because the stiffness of the plates for the internal fixation of the bone was determined based on them. At the end of the paper, the results of all analyzed plates are presented, their mutual comparison as well as the conclusion in which, based on everything done, it was stated which plate would be the most favorable solution for a given case of bone fracture.

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Determination of critical stress triaxiality along yield locus of isotropic ductile materials under plane strain condition

Bhadauria S. S., Pathak K. K., Hora M. S.

Materials Science Poland

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2012

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Vol. 30, No. 3

197--203

EN

It is widely accepted that failure due to plastic deformation in metals greatly depends on the stress triaxiality factor (TF). This article investigates the variation of stress triaxiality along the yield locus of ductile materials. Von Mises yield criteria and triaxiality factor have been used to determine the critical limits of stress triaxiality for the materials under plane strain condition. A generalized mathematical model for triaxiality factor has been formulated and a constrained optimization has been carried out using genetic algorithm. Finite element analysis of a two dimensional square plate has been carried out to verify the results obtained by the mathematical model. It is found that the set of values of the first and the second principal stresses on the yield locus, which results in maximum stress triaxiality, can be used to determine the location at which crack initiation may occur. Thus, the results indicate that while designing a certain component, such combination of stresses which leads the stress triaxiality to its critical value, should be avoided.