Modeling and Analysis of Weld Geometries, Size and Gap on Weld-Induced Thermal Stresses in a Solid Round-on-Flat Plate Fillet Weld

2017 ◽  
Author(s):  
Suhash Ghosh ◽  
Chittaranjan Sahay ◽  
Haider Al-Mamoury
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Thermal Stresses ◽  
Rapid Heating ◽  
Three Dimensional ◽  
Welding Process ◽  
Element Model ◽  
Fe Model ◽  
Fillet Weld ◽  
Modeling And Analysis

In this paper a finite element model is presented which describes the effects of fillet weld geometry on the thermal stresses. In a separate research, development of a finite element model for simulating welding-induced thermal stresses is discussed. This nonlinear FE model employs fully coupled three-dimensional thermo-mechanical formulation, including interfacial element to simulate the weaker solidified molten weld pool. Due to the nature of the welding process, heat generation from moving heat source, rapid heating and cooling gives rise to high stresses in the weld. This research investigates the effect of weld shape & size, weld gap, (l/d ratio) depth of weld to size ratio on the generated thermal stresses. The size of the round and flat stocks has been varied to investigate their effects of the stresses as well as to determine the thick-to-thin geometry limits based on acceptable design limits of thermal stresses.

Modeling, Simulation and Analysis of Weld-Induced Thermal Stresses in a Solid Round-on-Flat Plate Fillet Weld

2017 ◽  
Author(s):  
Suhash Ghosh ◽  
Chittaranjan Sahay ◽  
Haider Al-Mamoury
Keyword(s):  
Thermal Stresses ◽  
Rapid Heating ◽  
Three Dimensional ◽  
Welding Process ◽  
Element Model ◽  
Fe Model ◽  
Modeling Simulation ◽  
Heating And Cooling ◽  
Mechanical Formulation ◽  
Stress Components

In this paper, development of a finite element model for simulating welding-induced thermal stresses is discussed. This nonlinear FE model employs sequentially coupled three-dimensional thermo-mechanical formulation. A solid three dimensional 20 node brick elements have been used in ABAQUS, a linearly elastic and linearly plastic approach is implemented in the analysis. The effects of key process parameters, viz., power, size and speed of welding has been discussed. Further, the need for interfacial elements, instead of solid mesh elements to simulate molten weld solidification, has been investigated. Model validation with published literature has been employed to determine the appropriate properties for the interfacial element (shear and normal). Due to the nature of the welding process, heat generation from moving heat source, rapid heating and cooling gives rise to high stresses in the weld. These stresses have been observed to be greatly influenced by the process variables as well the properties of the selected interfacial element. Position, orientation and magnitude of the highest residual stress components are discussed.

Automotive Glass Exciter Technology for Acoustic Application

2014 ◽  
Author(s):  
Babak Ebrahimi ◽  
Amir Khajepour ◽  
Todd Deaville
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Experimental Studies ◽  
Element Model ◽  
Fe Model ◽  
Component Level ◽  
Modeling And Analysis ◽  
Electric Actuator ◽  
Conventional Systems ◽  
Fine Tune

This paper discusses the modeling and analysis of a novel audio subwoofer system for automotive applications using the automobile windshield glass. The use of a piezo-electric actuator coupled with a mechanical amplifier linked to a large glass panel provides a highly efficient method of producing sound. The proposed subwoofer system has the advantage over existing conventional systems of not only reducing the weight of the automobile, but also a significant power savings resulting in an increase of expected fuel economy. Among various design challenges, the glass-sealing design is of huge importance, as it affects the system dynamic response and so the output sound characteristics. The main goal in this manuscript is to evaluate different glass-sealing design configurations by providing a comprehensive Finite Element model of the system. To do so, a comprehensive, yet simplified FE model is developed, and experimental studies are performed in the component level to fine-tune and verify the model. Harmonic response of the system for each sealing configuration design is obtained in the frequency range of 0–200 Hz, and the results are compared and discussed. The finite element model is also beneficial in preliminary design of other components as well as the exciter placement, and predicting the performance of the overall system.

Research on the Key Technologies for Establishing the Finite Element Model of a Gyro-Stabilized Platform

2015 ◽  
Vol 742 ◽  
pp. 603-607
Author(s):  
Xiu Li Yang ◽  
Lin Jing Qin ◽  
Feng Xiao Huang ◽  
Wen Jing Guo
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Mode Analysis ◽  
Finite Element Models ◽  
Three Dimensional Model ◽  
Modeling And Analysis ◽  
Stabilized Platform ◽  
The Finite Element Model

The gyro-stabilized platform is one of the key parts of a guidance weapon. The structure performance of a platform influences the accuracy and reliability of the guidance weapon straightly. In order to reduce development cost and time, the structural modeling and analysis of gyro stabilized platform is very necessary. UG software is applied to establish the three-dimensional model of a platform firstly. And then some components are simplified using MSC Patron. According to the different connection mode between the components, some appropriate connecting elements are applied to establish the finite element model of the platform. In order to meet the special requirements of individual components, appropriate materials are selected so that the finite element model is closer to the actual situation which ensures the reliability of mode analysis and optimized computing results. The work in this paper provides reference for establishment of the similar structure finite element models.

Dynamic Characteristic Analysis of Inertial Navigation Platform' Structure

2012 ◽  
Vol 479-481 ◽  
pp. 1560-1564
Author(s):  
Wen Zeng ◽  
Hong Mei Xia ◽  
Yu Xing Wang ◽  
Liu Yi Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Inertial Navigation ◽  
Element Model ◽  
Characteristic Analysis ◽  
Modal Shape ◽  
Modeling And Analysis ◽  
Laser Gyro ◽  
Nature Frequency

The three-dimensional solid model and finite element model of an inertial navigation platform, is established by using ANSYS software. A modal analysis has been carried out. The former 6 ordered nature frequency and modal shape have been obtained and kept away from the frequency of Laser Gyro. The finite element model of the system vibration is established and is analysed for harmonic response. The calculation data show that vibration amplitude is very small and has no influence for the Laser Gyro working. The theory modal data is the same as the modal test results, so it manifests the accuracy and effectiveness in the modeling and analysis.

Torsional Analysis of a Steel Cord-Rubber Tire Belt Structure

1996 ◽  
Vol 24 (4) ◽  
pp. 339-348 ◽  
Author(s):  
R. M. V. Pidaparti
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Composite Structures ◽  
Three Dimensional ◽  
Element Model ◽  
Torsional Stiffness ◽  
Element Analysis ◽  
Rubber Belt ◽  
Steel Cord ◽  
Torsional Analysis

Abstract A three-dimensional (3D) beam finite element model was developed to investigate the torsional stiffness of a twisted steel-reinforced cord-rubber belt structure. The present 3D beam element takes into account the coupled extension, bending, and twisting deformations characteristic of the complex behavior of cord-rubber composite structures. The extension-twisting coupling due to the twisted nature of the cords was also considered in the finite element model. The results of torsional stiffness obtained from the finite element analysis for twisted cords and the two-ply steel cord-rubber belt structure are compared to the experimental data and other alternate solutions available in the literature. The effects of cord orientation, anisotropy, and rubber core surrounding the twisted cords on the torsional stiffness properties are presented and discussed.

Reduction of Free-Edge Stress Concentration

1985 ◽  
Vol 52 (4) ◽  
pp. 801-805 ◽  
Author(s):  
P. R. Heyliger ◽  
J. N. Reddy
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Free Edge ◽  
Shear Stresses ◽  
Normal Stresses ◽  
Interlaminar Shear ◽  
Three Dimensional Elasticity

A quasi-three dimensional elasticity formulation and associated finite element model for the stress analysis of symmetric laminates with free-edge cap reinforcement are described. Numerical results are presented to show the effect of the reinforcement on the reduction of free-edge stresses. It is observed that the interlaminar normal stresses are reduced considerably more than the interlaminar shear stresses due to the free-edge reinforcement.

Finite Element Model of Human Cochlea Considering of the Helicotrema Size

2013 ◽  
Vol 456 ◽  
pp. 576-581 ◽  
Author(s):  
Li Fu Xu ◽  
Na Ta ◽  
Zhu Shi Rao ◽  
Jia Bin Tian
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Basilar Membrane ◽  
Round Window ◽  
Element Model ◽  
Oval Window ◽  
Fe Model ◽  
Cochlear Duct ◽  
Human Cochlea ◽  
Set Up

A 2-D finite element model of human cochlea is established in this paper. This model includes the structure of oval window, round window, basilar membrane and cochlear duct which is filled with fluid. The basilar membrane responses are calculated with sound input on the oval window membrane. In order to study the effects of helicotrema on basilar membrane response, three different helicotrema dimensions are set up in the FE model. A two-way fluid-structure interaction numerical method is used to compute the responses in the cochlea. The influence of the helicotrema is acquired and the frequency selectivity of the basilar membrane motion along the cochlear duct is predicted. These results agree with the experiments and indicate much better results are obtained with appropriate helicotrema size.

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