A Non-Prismatic Beam Element for the Optimization of Flexure Mechanisms

2020 ◽  
Author(s):  
Koen Dwarshuis ◽  
Ronald Aarts ◽  
Marcel Ellenbroek ◽  
Dannis Brouwer
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Range Of Motion ◽  
Beam Element ◽  
Precision Engineering ◽  
Element Analysis ◽  
Leaf Springs ◽  
Prismatic Beam ◽  
The Common ◽  
Flexure Joints

Abstract Flexure joints are rapidly gaining ground in precision engineering because of their predictable behavior. However the range of motion of flexure joints is limited due to loss of support stiffness in deformed configurations. Most of the common flexure joints consist of prismatic leaf springs. This paper presents a simple non-prismatic beam formulation that can be used for the efficient modelling of non-prismatic leaf springs. The resulting stiffness and stress computed by the non-prismatic beam element are compared to the results of a finite element analysis. The paper shows that the support stiffness of two typical flexure joints can be increased up to a factor of 1.9 by using non-prismatic instead of prismatic leaf springs.

Incorporation of Spinal Flexibility Measurements Into Finite Element Analysis

1990 ◽  
Vol 112 (4) ◽  
pp. 481-483 ◽  
Author(s):  
Mack G. Gardner-Morse ◽  
Jeffrey P. Laible ◽  
Ian A. F. Stokes
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Stiffness Matrix ◽  
Beam Element ◽  
Technical Note ◽  
Element Analysis ◽  
Spinal Motion ◽  
Spinal Flexibility

This technical note demonstrates two methods of incorporating the experimental stiffness of spinal motion segments into a finite element analysis of the spine. The first method is to incorporate the experimental data directly as a stiffness matrix. The second method approximates the experimental data as a beam element.

Biomechanics of a posture-controlling cervical artificial disc: mechanical, in vitro, and finite-element analysis

2010 ◽  
Vol 28 (6) ◽  
pp. E11 ◽  
Author(s):  
Neil R. Crawford ◽  
Jeffery D. Arnett ◽  
Joshua A. Butters ◽  
Lisa A. Ferrara ◽  
Nikhil Kulkarni ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cervical Spine ◽  
Postural Control ◽  
Range Of Motion ◽  
Computer Modeling ◽  
Mechanical Testing ◽  
Artificial Disc ◽  
Element Analysis

Different methods have been described by numerous investigators for experimentally assessing the kinematics of cervical artificial discs. However, in addition to understanding how artificial discs affect range of motion, it is also clinically relevant to understand how artificial discs affect segmental posture. The purpose of this paper is to describe novel considerations and methods for experimentally assessing cervical spine postural control in the laboratory. These methods, which include mechanical testing, cadaveric testing, and computer modeling studies, are applied in comparing postural biomechanics of a novel postural control arthroplasty (PCA) device versus standard ball-and-socket (BS) and ball-in-trough (BT) arthroplasty devices. The overall body of evidence from this group of tests supports the conclusion that the PCA device does control posture to a particular lordotic position, whereas BS and BT devices move freely through their ranges of motion.

Research and Applications of a Plane Embedded Combined Element Model Considering Bond and Slip

2013 ◽  
Vol 275-277 ◽  
pp. 1296-1301
Author(s):  
Ji Wei Wang ◽  
Qin Qin Qiao ◽  
Fei Leng
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Shear Deformation ◽  
Element Model ◽  
Beam Element ◽  
Shape Functions ◽  
Element Analysis ◽  
Bond Slip ◽  
Numerical Examples ◽  
Nodal Force

It is one of the most important issues for finite element analysis of lining structures that how to describe anchor rod reasonably and effectively and simulate the interaction between rod and concrete or rock. Virtual nodes are constructed in concrete/rock element at the ends of anchor rod and bond-slip element is set between virtual nodes and beam element which describes anchor rod. An embedded combined element with bond slip and shear deformation is established through the transformation of nodal force at nodes of bond-slip element to those of concrete/rock element via shape functions. The element is convenient for meshing element because the location and direction of anchor rod are not necessary to be considered. Meanwhile, the element has the advantage of low computing cost. Finally, the validity and efficiency are verified by numerical examples.

scholarly journals Theoretical Modelling of Plate with Attached Vibration Absorber

2015 ◽  
Vol 773-774 ◽  
pp. 33-37 ◽  
Author(s):  
Izzuddin Zaman ◽  
Muhammad Mohamed Salleh ◽  
Bukhari Manshoor ◽  
Amir Khalid ◽  
Mohd Zamani Ngali ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Modelling ◽  
Vibration Absorber ◽  
Element Analysis ◽  
Constant Frequency ◽  
Structural Alterations ◽  
Theoretical Predictions ◽  
The Common

There are many ways to control the vibration of plate structure. Conventional approaches that include structural alterations are frequently time consuming and costly. One of the common schemes is using vibration absorber attached to a structure. In this paper, a mathematical model is developed to determine the frequency response of fixed-fixed ends plate with attached vibration absorber. A finite element analysis was performed and compared with the theoretical predictions and showed that there was good resemblance. The results demonstrated that the addition of vibration absorber onto plate can attenuate vibration considerably at a constant frequency.

Analysis of Common Defects for Rammed Earth Buildings

2012 ◽  
Vol 446-449 ◽  
pp. 353-357
Author(s):  
Yan Xin Zhang ◽  
Li Ping Tong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Seismic Behavior ◽  
Rammed Earth ◽  
Analysis Method ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
The Common

This paper takes the rammed earth buildings as the research object and summarizes their common defects. Finite element analysis method is used to analyze the cause of the common defects. These will provide a reference for improving the seismic behavior of these buildings.

Finite Element Analysis of the Temperature Shrinkage of Fiber Concrete

2014 ◽  
Vol 1004-1005 ◽  
pp. 1455-1459
Author(s):  
Wei Hong Xuan ◽  
Pan Xiu Wang ◽  
Yu Zhi Chen ◽  
Yan Wang ◽  
Xiao Hong Chen ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Elastic Modulus ◽  
Calculation Result ◽  
Steel Fiber ◽  
Stress Reaction ◽  
Element Analysis ◽  
Common Value ◽  
Fiber Concrete ◽  
The Common

In this paper, the temperature stress of singer piece was calculated by FEM and the stress reaction of PP fiber and steel fiber was analyzed. It is knew that the fiber with lower elastic modulus and lagerer spacing can provide weaker constraints and the restriction stress of fiber concrete is smaller. The calculation result of fiber reason space between is consistent with the common value in engineering.

scholarly journals STRUT LINKER GEOMETRY IMPROVING MECHANICAL BEHAVIOR OF CORONARY STENT

2020 ◽  
Vol 9 (2) ◽  
pp. 159
Author(s):  
Rachmat Sriwijaya ◽  
Dita Ayu Mayasari ◽  
Siti Sunarintyas
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Safety Factor ◽  
Biological Properties ◽  
Coronary Stent ◽  
Element Analysis ◽  
Common Solution ◽  
The Common

Stent is one of the common solution that is offered to the patient with atherosclerosis. An ideal stent should have good mechanical and biological properties. This research aims to analyze how importance strut linker geometry affect mechanical behavior of stent especially on recoil percentage, foreshortening percentage and fatigue safety factor prediction using finite element analysis. The result showed that strut linker geometry would specify the mechanical behavior.

Deflection Analysis of Non Prismatic Beam with Trapezoidal Sectorial Section with Uniformly Perpendicular Loading Condition

2016 ◽  
Vol 26 ◽  
pp. 1-10 ◽  
Author(s):  
Chetankumar M. Patel ◽  
Kartik D. Kothari ◽  
Ghanshyam D. Acharya
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analytical Method ◽  
Loading Condition ◽  
Engineering Application ◽  
Complex Loading ◽  
Element Analysis ◽  
Prismatic Beam ◽  
Deflection Analysis ◽  
Analytical Result

Non-prismatic beams are extensively used for many engineering application. Due to varying section, deflection analysis becomes very complex. Loading condition also makes the whole theory complex. This paper shows analytical analysis for the deflection of trapezoidal sectorial section with uniformly perpendicular loading condition. The method illustrated is comparatively easy and can be applied for the similar other sections as well. Analytical method is validated using Finite Element Analysis using Creo Simulation which shows good amount of match with analytical result.

scholarly journals Locking phenomena in finite element analysis of deep beam and removal method

2005 ◽  
Vol 27 (3) ◽  
pp. 129-139
Author(s):  
Nguyen Thang Hoa ◽  
Tran Ich Thinh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Behaviour ◽  
Beam Element ◽  
Deep Beam ◽  
Element Analysis ◽  
Slow Convergence ◽  
Indispensable Tool ◽  
Material Conditions ◽  
Locking Phenomena

Since earlier 30 years ago, Finite Element Methods (FEM) has become an indispensable tool of engineers for analysis mechanical behaviour of structures. Generally displacement models are used in most usual problems. Under certain material conditions, such elements may provide inaccurate results and exhibit slow convergence. Locking phenomena are the cause of these problems and this situation could limit the computation of many kinds of structures. This paper presents a deep beam element based upon mixed formulation, which may illuminate these locking phenomena.

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