Approximate Structural Analysis of Circuit Card Systems Subjected to Torsion

1992 ◽  
Vol 114 (2) ◽  
pp. 203-210 ◽  
Author(s):  
P. A. Engel ◽  
J. T. Vogelmann
Keyword(s):  
Finite Element ◽  
Structural Analysis ◽  
Large Deflection ◽  
Torsional Stiffness ◽  
Geometrically Nonlinear ◽  
Engineering Analysis ◽  
Printed Circuit ◽  
Engineering Theory ◽  
Simplified Method ◽  
Numerical Finite Element

Engineering analysis of module-populated printed circuit cards subjected to torsion is pursued by approximate engineering analysis, numerical (finite element), and experimental means. The engineering theory utilizes a simplified method of evaluating the torsional stiffness and maximum lead force, the latter found at the module corners. Finite element methods are used to check these values for circuit cards with a wide variety of module configurations, starting from a single-module to sixteen PLCC modules, having 44, 68, and 84 J-leads. An experimental torsion apparatus is used to obtain data for further comparison with the former approaches, and for getting data from the geometrically nonlinear (large deflection) range.

Finite Element Analysis of Different Flexure Springs

2010 ◽  
Vol 44-47 ◽  
pp. 2065-2069
Author(s):  
Xi Chen ◽  
Ying Liu ◽  
Hua Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Analysis ◽  
Geometrically Nonlinear ◽  
Advisory Opinion ◽  
Element Analysis ◽  
Radial Stiffness ◽  
The Finite Element Analysis ◽  
High Fatigue ◽  
Nonlinear Static

Flexure spring suspensions have demonstrated the ability to provide long operating lifetimes for cryocoolers. The good flexure spring need high radial stiffness and high fatigue life. The profile curves are very important for flexure spring. In this paper, based on the finite element analysis software (ANSYS), geometrically nonlinear static structural analysis and nonlinear dynamics structural analysis were made to several different flexure springs. The fatigue strength, axial and radial stiffness, modal frequency were calculated and listed. The different performance between linear flexure spring and spiral flexure spring were discussed, which would provide an advisory opinion for the design and application of flexure spring in space cryocooler.

Design of a cutting head for a crosscutting machine

2016 ◽  
Vol 231 (1) ◽  
pp. 5-17 ◽  
Author(s):  
D Croccolo ◽  
M De Agostinis ◽  
S Fini
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Analysis ◽  
Dynamic Behavior ◽  
Analytical Model ◽  
Analytical Models ◽  
Rectangular Section ◽  
Element Analysis ◽  
Cutting Head ◽  
Numerical Finite Element

The present paper deals with the structural analysis and the re-design of a cutting head for an automatic crosscutting machine. The machine is already marketed, and can process rectangular section wooden slats. The principal goal of this work is to develop a new mechanism capable of enhancing the productivity of the machine by around 80%. The work has been carried out by means of both numerical finite element analysis tools and analytical models. In fact, a secondary aim of the research is to define an analytical model which can capture the dynamic behavior of the device: this tool will be helpful to the design engineer in order to save costs associated with the development of future head designs.

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.

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