A General Formulation for Designing Interference-Fit Joints With Elastic-Plastic Components

2004 ◽  
Vol 126 (4) ◽  
pp. 737-743 ◽  
Author(s):  
Niccolo` Baldanzini
Keyword(s):  
Finite Element ◽  
Material Characterization ◽  
Iterative Procedure ◽  
Yield Criterion ◽  
Theoretical Models ◽  
Finite Element Models ◽  
Interference Fit ◽  
Wide Applicability ◽  
Elastic Plastic ◽  
Plastic Components

A general approach for designing interference-fit joints constituted of elastic-plastic components is presented. The wide applicability range of the method was achieved removing restrictive assumptions about material characterization and yield criterion, which were included in previous theoretical models. Because of the general approach, the model is solved with an iterative procedure. The theory has been successfully validated by a result comparison with finite element models.

Modeling and Simulation of Implant-Supported Fixed Partial Dentures Prosthodontic

2009 ◽  
Vol 16-19 ◽  
pp. 1112-1116
Author(s):  
Dong Lei Liu ◽  
Hua Yan ◽  
Zong Bao Shen ◽  
Xin Hua Song ◽  
Xiao Wang
Keyword(s):  
Finite Element ◽  
Modeling And Simulation ◽  
Optimum Design ◽  
Theoretical Models ◽  
Finite Element Models ◽  
Sectional Area ◽  
Positive Effect ◽  
Maximum Stresses

The theoretical models and finite element models of implant-supported fixed partial dentures and surrounding osseous tissues were founded. It was studied of the influence of connector sectional area on implant-supported fixed partial dentures and surrounding osseous tissues. The results indicate that increasing the connector sectional areas to some extent has positive effect on fixed bridge itself. But the maximum stresses in some regions of surrounding osseous tissues increase as the connector sectional areas increase, the change extent is smaller comparatively. The study provides biomechanics evidence for the optimum design of implant-supported fixed partial dentures.

Finite-Element Solution of Elastic-Plastic Boundary-Value Problems

1981 ◽  
Vol 48 (1) ◽  
pp. 69-74 ◽  
Author(s):  
J. H. Prevost ◽  
T. J. R. Hughes
Keyword(s):  
Finite Element ◽  
Boundary Value Problems ◽  
Plastic Material ◽  
Finite Element Models ◽  
Element Solution ◽  
Elastic Plastic ◽  
Material Stiffness ◽  
Integration Techniques ◽  
Elastic Plastic Material ◽  
Selective Integration

It is demonstrated that elastic-plastic failure states may be captured in finite-element models by employing (1) the elastic-plastic material stiffness to form the global stiffness, (2) reduced/selective integration techniques to alleviate mesh “locking” due to incompressibility, and (3), in the case of symmetrical configurations, an imperfection in the form of a weak element.

Analysis of Explosively Actuated Valves

1994 ◽  
Vol 116 (3) ◽  
pp. 809-815 ◽  
Author(s):  
B. K. Jones ◽  
A. F. Emery ◽  
M. F. Hardwick ◽  
R. Ng
Keyword(s):  
Finite Element ◽  
Critical Factor ◽  
Disk Model ◽  
Interference Fit ◽  
Elastic Plastic ◽  
Drag Forces ◽  
Plastic Materials ◽  
Elastic Plastic Materials ◽  
Thin Disks ◽  
Plastic Disk

Explosive valves are generally composed of a plunger which is explosively driven along the bore of a cylindrical housing. The plunger is forced to stop at a location designed to alter a particular fluid flow configuration. The stopping point of the plunger is determined by the drag forces between the plunger and the housing and is the critical factor in obtaining the desired flow. One way of calculating these drag forces is to model the valve as a series of thin disks and to assume an elastic interference fit between the disks of the plunger and the disks of the housing. Explosive valves constructed with new materials and new geometries, however, have made it necessary to account for plastic deformations, including strain hardening. This paper introduces an elastic-plastic disk model based on a combination of closed form and finite element results. The behavior of the calculations with elastic-plastic materials is compared to various finite element representations of an explosive valve to verify the disk model and to quantify the effects of plasticity and large deformations. Finally, the elastic-plastic calculations are compared to experimental results obtained from actual valves with various materials and geometries.

Elastic-Plastic Solutions for Open-End Thick Walled Cylinders Subjected to Internal and External Pressures

2008 ◽  
Author(s):  
R. D. Dixon ◽  
E. H. Perez
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Yield Criterion ◽  
External Pressure ◽  
Plastic Collapse ◽  
Elastic Instability ◽  
Element Analysis ◽  
Collapse Pressure ◽  
Elastic Plastic ◽  
External Pressures

Available theoretical solutions for the collapse pressure of open-end thick walled cylinders based on the Vo n Misses yield criterion are very limited. The known elastic-plastic theoretical solutions are primarily based on the Tresca yield criterion. So far, little study has been devoted to fairly thick open-end cylinders under external pressure. This can be performed by finite element analysis that considers material plasticity. In this paper the authors propose the use of simple formulae for the solution of the collapse internal and external pressures of open-end cylinders. The proposed formulae provide excellent agreement with finite element results obtained by the authors. Also criterion is provided for the interaction of elastic instability and plastic collapse of open-end cylinders subjected to external pressure.

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