Finite Element Analysis of a Contact With Friction Between an Elastic Body and a Thin Soft Layer

2005 ◽  
Vol 127 (3) ◽  
pp. 461-468 ◽  
Author(s):  
Vannina Linck ◽  
Guy Bayada ◽  
Laurent Baillet ◽  
Taoufik Sassi ◽  
Jalila Sabil
Keyword(s):  
Finite Element ◽  
Mechanical System ◽  
Elastic Body ◽  
Thin Layers ◽  
Physical Contact ◽  
Rigid Surface ◽  
Element Analysis ◽  
Calculation Time ◽  
Specific Contact ◽  
Thin Elastic Layer

When studying a mechanical system involving contact between two bodies such as a disc and brake pad system, finite element simulations are often used to predict the phenomena involved. However, due to model size and calculation time problems, when modeling this type of mechanical system on a scale of about 100 mm, it is difficult to model as well a layer (for example a third body layer) on a scale of approximately 10 μm. In quasi-static problems it is possible to simulate the contact between an elastic body and a thin elastic layer bonded to a rigid surface, by considering the contact between this elastic body and a rigid surface with a specific contact law. This paper shows that it is possible to implement this specific contact law in a dynamic finite element code to simulate thin layers undergoing quasi-static and dynamic problems without physical contact instabilities. This specific contact law saves a large amount of calculation time. Once the specific contact law has been validated, the influence of the layer thickness is studied.

scholarly journals Factor of Safety Reduction Factors for Accounting for Progressive Failure for Earthen Levees with Underlying Thin Layers of Sensitive Soils

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
Adam J. Lobbestael ◽  
Adda Athanasopoulos-Zekkos ◽  
Josh Colley
Keyword(s):  
Finite Element ◽  
Strain Softening ◽  
Progressive Failure ◽  
Limit Equilibrium ◽  
Thin Layers ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Limit Equilibrium Methods ◽  
The Stability ◽  
Reduction Factors

The effects of progressive failure on flood embankments with underlying thin layers of soft, sensitive soils are investigated. Finite element analysis allows for investigation of strain-softening effects and progressive failure in soft and sensitive soils. However, limit equilibrium methods for slope stability analysis, widely used in industry, cannot capture these effects and may result in unconservative factors of safety. A parametric analysis was conducted to investigate the effect of thin layers of soft sensitive soils on the stability of flood embankments. A flood embankment was modeled using both the limit equilibrium method and the finite element method. The foundation profile was altered to determine the extent to which varying soft and sensitive soils affected the stability of the embankment, with respect to progressive failure. The results from the two methods were compared to determine reduction factors that can be applied towards factors of safety computed using limit equilibrium methods, in order to capture progressive failure.

scholarly journals Rocking motion of slender elastic body on rigid floor

1986 ◽  
Vol 19 (1) ◽  
pp. 18-27 ◽  
Author(s):  
T. Ichinose
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Angular Momentum ◽  
Elastic Body ◽  
Vibration Mode ◽  
Simple Relationship ◽  
Element Analysis ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Rocking Motion

A single degree of freedom (SDOF) model is presented to describe the rocking behaviour of a slender elastic body on a rigid floor. This model assumes the vibration mode to be a linear combination of flexural and rocking modes. A finite element analysis is also presented, in which following features are observed to support the assumptions of the proposed SDOF model: (1) There exists a simple relationship between the magnitudes of flexural and rocking modes, which relation can be derived from the equilibrium of moment. (2) Angular momentum is conserved at the instances of uplifting and landing.

Finite Element Analysis of a Layered Elastic Solid in Normal Contact With a Rigid Surface

1988 ◽  
Vol 110 (3) ◽  
pp. 477-485 ◽  
Author(s):  
K. Komvopoulos
Keyword(s):  
Finite Element ◽  
Elastic Solid ◽  
Interface Layer ◽  
Rigid Surface ◽  
Element Analysis ◽  
Normal Contact ◽  
Homogeneous Half Space ◽  
Contact Width ◽  
Substrate Properties ◽  
Stress And Deformation

Based on the finite element method, the elastic contact problem of a layered semi-infinite solid compressed by a rigid surface is solved numerically. The case of a surface layer stiffer than the substrate is considered, and general solutions for the subsurface stress and deformation fields are presented for relatively thin, intermediate, and thick layers. Additionally, the stresses in a compressed homogeneous half-space having the substrate properties have been obtained for comparison. The significance of the layer thickness relative to the size of the half-contact width, the friction coefficient at the contact zone, and the stiffness of the layer are critically examined and the conditions under which the layer is beneficial are addressed. Furthermore, the mechanisms of microcrack initiation at the layer surface or interface, layer debonding, and onset of plastic flow in the layered solid are explained qualitatively, in light of the governing stresses, and the regimes of their prevalence are approximately determined.

Research on Mechanical System Design Based on Service-Oriented Architecture

2012 ◽  
Vol 538-541 ◽  
pp. 3047-3050
Author(s):  
Nai Gen Li ◽  
Nian Jun Zhang ◽  
Meng Guo Zhu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
System Design ◽  
Mechanical System ◽  
Design Theory ◽  
Service Oriented Architecture ◽  
Design Method ◽  
Element Analysis ◽  
Analysis Process ◽  
Service Oriented

The mechanical system design method based on the Service Oriented Architecture was proposed through the service-oriented architecture technology and mechanical system design theory analysis .The machine arm system design finite element analysis process was presented. Based on the TomCat platform design, Service oriented architecture design of the robot arm system design based on finite element analysis process were established. This design method was verified technically.

scholarly journals Assessment of Automobile Door Slam using Finite Element Method

2020 ◽  
Vol 9 (4) ◽  
pp. 348-355
Keyword(s):  
Finite Element ◽  
Automotive Industry ◽  
Design Procedure ◽  
Detailed Comparison ◽  
Opening Angle ◽  
Rigid Surface ◽  
Time Step ◽  
Element Analysis ◽  
Automotive Structures ◽  
Acceleration Stress

Automotive cars have various types of doors. The swinging door is the most common & complicated parts because they are doing both functions, general guidelines of car style, & passenger's safety by protecting humans from side crashes. With the advent of Computer Aided Engineering (CAE), Finite Element Analysis (FEA) has become a necessity for the automotive industry to improve and validate all manner of automotive structures. The use of FEA in the design procedure has increased significantly making validation of the FE Models used is essential. A comparison with experimental results of Door slam testing is a very effective method to evaluate the accuracy of the FE Models used. The objective of the door slam testing is to determine acceleration, stress, strains & buckling energy induced while slamming action. In this door slam analysis carried out using CAE tools, Hypermesh-v12, Ls-Dyna. Door is slammed on rigid surface at velocity 1m/sec from opening angle 20 degree and results are evaluated for 0.35 seconds in the time step of 0.01second.Then predictability of the CAE method is examined through detailed comparison of experimental acceleration and strain results. While these results shows excellent agreement in CAE and test for accelerations on the outer panel. Also CAE predicts higher strains on the inner panel than the test. In addition, elastically buckling of outer panel is examined. These results of Acceleration, strain and buckling are also discussed in detail.

A New Method for 3-D Contact Problems of Four-Row Tapered Roller Bearing Using Finite Element Analysis

1990 ◽  
Author(s):  
Qigui Zhang ◽  
Jun Yu ◽  
Yuanke Li ◽  
Caiyan Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Axial Force ◽  
Roller Bearing ◽  
Contact Boundary ◽  
Computation Method ◽  
Steel Mill ◽  
Element Analysis ◽  
Calculation Time ◽  
Tapered Roller

Abstract The most glaring problems in reality in the field of finite element analysis of tapered roller bearings are long calculation time and great error due to neglect of axial force. The static condensation method and solving technique are introduced in this paper to reduce the calculation time and raise the calculation precision. Due to the effects of axial force, the contact boundary becomes more complicated. Up to now, the paper dealing with axial force is rarely seen. This paper mainly studies four-row tapered steel mill bearing under reality loaded condition with finite element analysis and computation method. The contact load-distribution given by finite element calculation is in agreement with photo-elastic experiment. This paper also supplies a fast and effective numerical method for finite element analysis of many other types of bearings.

FINITE ELEMENT ANALYSIS OF THERMAL NANOINDENTATION PROCESS AND ITS EXPERIMENTAL VERIFICATION

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5949-5954
Author(s):  
HYUN-JUN OH ◽  
EUN-KYUNG LEE ◽  
CHUNG-GIL KANG ◽  
SANG-MAE LEE
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Elastic Recovery ◽  
Nanoindentation Test ◽  
Rigid Surface ◽  
The Finite Element Method ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Pile Up ◽  
Fine Pattern

In this paper, deformation behavior of Polymethylmethacrylate (PMMA) during thermal indentation was demonstrated by the finite element method using ABAQUS S/W. Forming conditions to reduce the elastic recovery and pile-up were proposed. Thermal nanoindentation experiments were carried out at the temperature range of 110 ~ 150 ° C . The indenter was modeled as a rigid surface. The finite element analysis (FEA) approach is capable of reproducing the loading-unloading behavior for a thermal nanoindentation test and thus comparison between the experimental data and numerical results were demonstrated. The result of the investigation will be applied to the fabrication of the hyper-fine pattern.

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