scholarly journals Effect of Axial Deformation Caused by Torsion on a Solid Steel Cylinder

2021 ◽  
Author(s):  
Dawson Forsey
Keyword(s):  
Finite Element Analysis ◽  
Rotation Angle ◽  
Axial Rotation ◽  
Axial Deformation ◽  
Torsional Loading ◽  
Element Analysis ◽  
Steel Cylinder ◽  
Cylindrical Shaft ◽  
Deformation Stress ◽  
Analysis Models

Equations describing the classical theory of applied torsion and axial rotation on a solid cylindrical shaft have been modified by Shirali and Hossain (2019) to derive new theorems, which can take into consideration axial deformation of members. The modified theorems use various empirical parameters to introduce the combined effect of axial force, axial displacement and axial rotation, which is neglected in classical theorems of torsion. Multiple finite element analysis models for solid steel cylindrical members, fixed at one end and subjected to torsion at its free end, were developed to study the effects of torsional loading. The effect of axial deformation/stress developed in the cylinder is analyzed and compared with values predicted by classical and proposed modified theorems (equations). It is shown that the cylinder can shorten or elongate when subjected to torsion. The proposed theorems/equations, based on axial deformation subjected to torsion, provide more accurate predictions of shear stress and axial rotation (angle of twist).

scholarly journals Effect of Axial Deformation Caused by Torsion on a Solid Steel Cylinder

2021 ◽  
Author(s):  
Dawson Forsey
Keyword(s):  
Finite Element Analysis ◽  
Rotation Angle ◽  
Axial Rotation ◽  
Axial Deformation ◽  
Torsional Loading ◽  
Element Analysis ◽  
Steel Cylinder ◽  
Cylindrical Shaft ◽  
Deformation Stress ◽  
Analysis Models

Equations describing the classical theory of applied torsion and axial rotation on a solid cylindrical shaft have been modified by Shirali and Hossain (2019) to derive new theorems, which can take into consideration axial deformation of members. The modified theorems use various empirical parameters to introduce the combined effect of axial force, axial displacement and axial rotation, which is neglected in classical theorems of torsion. Multiple finite element analysis models for solid steel cylindrical members, fixed at one end and subjected to torsion at its free end, were developed to study the effects of torsional loading. The effect of axial deformation/stress developed in the cylinder is analyzed and compared with values predicted by classical and proposed modified theorems (equations). It is shown that the cylinder can shorten or elongate when subjected to torsion. The proposed theorems/equations, based on axial deformation subjected to torsion, provide more accurate predictions of shear stress and axial rotation (angle of twist).

Linear Thermomechanical Microactuators

1999 ◽  
Author(s):  
Rebecca Cragun ◽  
Larry L. Howell
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Expansion ◽  
Cross Sections ◽  
Variable Cross ◽  
Element Analysis ◽  
Thermal Actuators ◽  
Output Force ◽  
Analysis Models ◽  
High Output

Abstract Thermomechanical in-plane microactuators (TIMs) have been designed, modeled, fabricated, and tested. TIMs offer an alternative to arrays of smaller thermal actuators to obtain high output forces. The design is easily modified to obtain the desired output force or deflection for specific applications. The operational principle is based on the symmetrical thermal expansion of variable cross sections of the surface micromachined microdevice. Sixteen configurations of TIMs were fabricated of polysilicon. Finite element analysis models were used to predict the deflection and output force for the actuators. Experimental results were also recorded for all sixteen configurations, including deflections and output forces up to 20 micron and 35 dyne.

Behavior of Congruent Tessellation Stacks Under Torsional Loading

2016 ◽  
Author(s):  
Yves Klett ◽  
Fabian Muhs ◽  
Peter Middendorf
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Degree Of Freedom ◽  
Simple Solution ◽  
Torsional Loading ◽  
Element Analysis ◽  
Torsional Loads ◽  
Structural Mechanisms ◽  
Potential Use

The combination of several layers of rigidly foldable tessellations into can produce cellular material stacks with interesting properties, especially if the resulting stack preserves the mobility of its constituting layers. To achieve this, the construction of functional joining and hinging concepts need to be developed. This paper presents a simple solution to effectively joining different 1-DOF (degree of freedom) tessellation layers. The mechanical properties of the resulting structures under torsional loads are evaluated using finite element analysis, and their potential use as structural mechanisms is discussed.

Modeling and Calculation of Dynamic Performances of NC Machine Tool Considering Linear Rolling Guideway

2009 ◽  
Vol 16-19 ◽  
pp. 510-514 ◽  
Author(s):  
Yao Man Zhang ◽  
Zhi Kun Xie ◽  
Yong Xian Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Machine Tool ◽  
Static Characteristic ◽  
Element Analysis ◽  
Nc Machine Tool ◽  
The Finite Element Analysis ◽  
Nc Machine ◽  
Dynamic Performances ◽  
Analysis Models

The linear rolling guideway is one of the most essential parts of the machine tool. So it is very important to analyze the dynamic-static characteristic of the machine tool consider rolling guideway and to study the effect on machinery function. The paper’s research is based on a NC machine tool produced by a certain plant of machine tools. Methods of simulating the rolling guideway support are studied, and the configuration of the spring damper elements of the bearing supports are also studied, and the finite element analysis on the CKS6125 machine tool has been made to confirm its dynamic characteristics. Then the finite element analysis models are validated by some experiments.

Numerical Design of Tubesheet Structure Based on Finite Element Analysis

2010 ◽  
Author(s):  
Xiaodong Yu ◽  
Caifu Qian ◽  
Hongjie Yu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Heat Exchangers ◽  
Element Analysis ◽  
Pressure Load ◽  
Welding Method ◽  
Numerical Design ◽  
Strength And Stiffness ◽  
Analysis Models

In this paper, finite element analysis models were established to simulate a tubesheet connected with tubes by expanding or welding method. Stresses and deformations in the tubesheet produced by pressure load were calculated with emphasis on the effect of the tubes support. Results showed that the deflections and stresses at the un-perforated zone are greatly affected by the radius of the perforated circle for a partly perforated tubesheet, but they are not sensitive to the radius of the tubesheet when it is fully supported by tubes. If applying numerical design for heat exchangers based on finite element analysis, the tubesheet thickness could be significantly reduced. Compared with the welding connection, expanding connection of the tubes and tubesheet is more helpful to raise the strength and stiffness of the perforated tubesheet.

Reusability-based selection of parametric finite element analysis models

2009 ◽  
Vol 23 (2) ◽  
pp. 197-214
Author(s):  
Nsikan Udoyen ◽  
David W. Rosen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Adaptive Reuse ◽  
Element Analysis ◽  
Fea Modeling ◽  
New Information ◽  
Parametric Finite Element Analysis ◽  
Method Factors ◽  
Analysis Models ◽  
Selection Of

AbstractA selection method to support adaptive reuse of parametric finite element analysis (FEA) models is introduced in this paper. Adaptive reuse of engineering artifacts such as FEA models is common in product design, but difficult to automate because of the need to integrate new information. The proposed method factors reusability into selection by evaluating models based on comparative estimates of effort involved in adapting them for reuse to model a query problem. The method is developed for FEA models of component-based designs. FEA modeling of electronic chip packages is used to illustrate the method's usefulness. We conclude with a discussion on the method's advantages and limitations and highlight important issues for further research.

scholarly journals Biomechanical analyses of Cambrian euarthropod limbs reveal their effectiveness in mastication and durophagy

2021 ◽  
Vol 288 (1943) ◽  
pp. 20202075
Author(s):  
Russell D. C. Bicknell ◽  
James D. Holmes ◽  
Gregory D. Edgecombe ◽  
Sarah R. Losso ◽  
Javier Ortega-Hernández ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Horseshoe Crab ◽  
Limulus Polyphemus ◽  
Arms Race ◽  
Trophic Relationships ◽  
Element Analysis ◽  
Biomechanical Models ◽  
Analysis Models ◽  
Key Innovations

Durophagy arose in the Cambrian and greatly influenced the diversification of biomineralized defensive structures throughout the Phanerozoic. Spinose gnathobases on protopodites of Cambrian euarthropod limbs are considered key innovations for shell-crushing, yet few studies have demonstrated their effectiveness with biomechanical models. Here we present finite-element analysis models of two Cambrian trilobites with prominent gnathobases— Redlichia rex and Olenoides serratus —and compare these to the protopodites of the Cambrian euarthropod Sidneyia inexpectans and the modern American horseshoe crab, Limulus polyphemus . Results show that L. polyphemus , S. inexpectans and R. rex have broadly similar microstrain patterns, reflecting effective durophagous abilities. Conversely, low microstrain values across the O. serratus protopodite suggest that the elongate gnathobasic spines transferred minimal strain, implying that this species was less well-adapted to masticate hard prey. These results confirm that Cambrian euarthropods with transversely elongate protopodites bearing short, robust gnathobasic spines were likely durophages. Comparatively, taxa with shorter protopodites armed with long spines, such as O. serratus , were more likely restricted to a soft food diet. The prevalence of Cambrian gnathobase-bearing euarthropods and their various feeding specializations may have accelerated the development of complex trophic relationships within early animal ecosystems, especially the ‘arms race' between predators and biomineralized prey.

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