Influence of Residual Stresses and Particle Properties on Mechanical Response of the Material in Particulate Ceramic Composites

2016 ◽  
Vol 713 ◽  
pp. 212-215 ◽  
Author(s):  
Kateřina Štegnerová ◽  
Luboš Náhlík ◽  
Pavel Hutař ◽  
Pavel Pokorný ◽  
Zdeněk Majer
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Residual Stresses ◽  
Mechanical Behaviour ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Ceramic Composites ◽  
Particle Properties ◽  
Three Dimensional Models

The contribution deals with the issue of mechanical response of the particulate ceramic composites used in microelectronic. Mechanical properties and behaviour of composites are highly influenced by residual stresses which are developed in material during cooling in manufacturing process due to the different coefficients of thermal expansions of individual constituents. The main aim of this paper is to estimate the elastic constants and strength of the selected particulate ceramic composites with considering the residual stresses. Three dimensional models and finite element method are used for numerical simulations. Results contribute to determination and better understanding of mechanical behaviour of the particulate ceramic composites.

Influence of Particle Attributes on Residual Stresses in Particulate Ceramic Composites

2016 ◽  
Vol 258 ◽  
pp. 190-193
Author(s):  
Kateřina Štegnerová ◽  
Luboš Náhlík ◽  
Raúl Bermejo ◽  
Pavel Hutař
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Model ◽  
Residual Stresses ◽  
Mechanical Behaviour ◽  
Three Dimensional ◽  
Ceramic Composites ◽  
Composite Matrix ◽  
Particle Properties ◽  
Fracture Processes

The contribution deals with the issue of residual stresses in particulate ceramic composites used in microelectronics. Residual stresses are developed in the composite due to cooling during manufacturing process. Different coefficients of thermal expansions of particles and matrix cause important residual stresses in the composite influencing their mechanical behaviour. The main aim of the paper is to determine influence of particle properties on magnitude and distribution of residual stresses in the composite matrix. Three dimensional numerical model was developed and finite element method (FEM) was used for numerical simulations. Results obtained contribute to a better understanding of residual stresses distribution and fracture processes in the studied type of composite.

Simulation of the Impact Behaviour of Diffusion-Bonded and Adhered Perforated Hollow Sphere Structures (PHSS)

2009 ◽  
Vol 294 ◽  
pp. 27-38 ◽  
Author(s):  
Fabian Ferrano ◽  
Marco Speich ◽  
Wolfgang Rimkus ◽  
Markus Merkel ◽  
Andreas Öchsner
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behaviour ◽  
Hollow Sphere ◽  
Large Deformations ◽  
The Finite Element Method ◽  
Impact Behaviour ◽  
New Type ◽  
The Impact

This paper investigates the mechanical properties of a new type of hollow sphere structure. For this new type, the sphere shell is perforated by several holes in order to open up the inner sphere volume and surface. The mechanical behaviour of perforated sphere structures under large deformations and strains in a primitive cubic arrangement is numerically evaluated by using the finite element method for different hole diameters and different joining techniques.

Design of Above-Knee Prosthesis: A Finite Element Stress Analysis

2015 ◽  
Vol 1125 ◽  
pp. 432-436 ◽  
Author(s):  
Sandro Mihradi ◽  
Calvindoro Zeus Abdiwijaya ◽  
Tatacipta Dirgantara ◽  
Andi Isra Mahyuddin
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Knee Prosthesis ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Strength Criteria ◽  
Finite Element Stress Analysis ◽  
Three Dimensional Models ◽  
Four Bar Linkage

In the present research, three-dimensional models of above-knee prosthesis, consist of socket, four-bar linkage knee, pylon and foot, are developed. These models have to fulfill criteria such as stability, ability to withstand up to 90 kg of bodyweight, ability to flex up to 130 degree, easy for maintenance, simple manufacturing process, affordable and yet reliable. As the first step of development, these models were evaluated using finite element method software to determine whether or not the design has fulfilled strength criteria. The results show that the last iteration of the three dimensional model of the knee prosthesis has satisfied the criteria.

Biomechanical Mechanisms and Hemodynamics in the Case of Stenosis

2019 ◽  
Vol 9 (10) ◽  
pp. 1334-1338
Author(s):  
Yu-Chou Huang ◽  
Han-Yi Cheng
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Blood Flow ◽  
Magnetic Resonance ◽  
Blood Flow Velocity ◽  
Three Dimensional ◽  
Vascular Wall ◽  
Magnetic Resonance Images ◽  
Artery Segment

The objective of the present study is to investigate the blood flow of the artery with stenosis using finite element method. Three-dimensional 3-D artery models were reconstructed to simulate blood hemodynamic behaviors from magnetic resonance images. Many papers have studied 3-D finite element artery models, but few have examined the effects of different stenosis thicknesses in arteries. It is imperative to incorporate the mechanical properties of a diseased artery segment into treatment planning because stress is a strong biological trigger that directs atherosclerosis protection. Stress may also have predictive value to pinpoint regions at risk for restenosis. The results showed that stenosis of a 1 mm thickness decreased the blood flow velocity about 48%. This confirmed that stenosis also induces abnormal stress in the narrowest position of a vascular wall. This research provides information for arteries with stenosis in clinical treatment.

Investigation into the Effect of the Nut Thread Run-Out on the Stress Distribution in a Bolt Using the Finite Element Method

2003 ◽  
Vol 125 (3) ◽  
pp. 527-532 ◽  
Author(s):  
J. W. Hobbs ◽  
R. L. Burguete ◽  
E. A. Patterson
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
Three Dimensional ◽  
Element Model ◽  
Two Dimensional ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Dimensional Models ◽  
Three Dimensional Models

By means of comparing results from finite element analysis and photoelasticity, the salient characteristics of a finite element model of a nut and bolt have been established. A number of two-dimensional and three-dimensional models were created with varying levels of complexity, and the results were compared with photoelastic results. It was found that both two-dimensional and three-dimensional models could produce accurate results provided the nut thread run-out and friction were modeled accurately. When using two-dimensional models, a number of models representing different positions around the helix of the thread were created to obtain more data for the stress distribution. This approach was found to work well and to be economical.

Structural Analysis

2017 ◽  
pp. 124-219
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Analysis ◽  
Numerical Methods ◽  
Three Dimensional ◽  
Wind Engineering ◽  
The Finite Element Method ◽  
Material Models ◽  
Three Dimensional Models ◽  
Base Connections

This chapter develops the components required for successful modelling of temporary structures. It presents the principles, methods and the associated limitations that currently are seen as the state-of-the-art in structural analysis using the Finite Element Method. Material models of steel, aluminium and bamboo are presented with an emphasis on linear and multilinear models for steel and the Ramberg-Osgood model for aluminium. Models are presented for braces, props, beam-to-column connections, top connections, base connections and column-to-column connections based on the latest theoretical and experimental procedures developed by the authors and co-workers. Examples of two and three dimensional models are then developed for access scaffolds, bridge falsework and bamboo scaffolds. Finally, the chapter presents information on the effects of ground modelling and on advanced wind engineering using complex numerical methods.

Estimation of Surface Fault Displacement by High Performance Computing

2018 ◽  
Vol 12 (04) ◽  
pp. 1841003 ◽  
Author(s):  
Masataka Sawada ◽  
Kazumoto Haba ◽  
Muneo Hori
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nuclear Power ◽  
High Performance ◽  
Time Integration ◽  
Three Dimensional ◽  
Shear Stiffness ◽  
Dynamic Simulations ◽  
Three Dimensional Models ◽  
Element Method

Reliable estimation of surface fault displacements is crucial to the safety of nuclear power plant facilities. It is necessary to develop a numerical method for the estimation. In the study, we develop a finite element method in which the following two functions are implemented: (1) a symplectic time integration of an explicit scheme to properly conserve the energy of the system; and (2) rigorously formulated joint elements of high order. The finite element method is enhanced with parallel computing capability. We apply the developed method to solve simple three-dimensional models of faults embedded in a rock mass. It includes a comparison of results from quasi-static and dynamic simulations and investigation of the sensitivity of results to the shear stiffness on faults. In the study, we propose capacity computing with a quasi-static simulation for uncertainty quantification.

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