scholarly journals Influence of the Main Contact Parameters in Finite Element Analysis of Elastic Bodies in Contact

2016 ◽  
Vol 681 ◽  
pp. 214-227 ◽  
Author(s):  
Gabriel Hattori ◽  
Alberto Luiz Serpa
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Contact Stiffness ◽  
Great Influence ◽  
Contact Problems ◽  
Correct Choice ◽  
Element Analysis ◽  
Contact Algorithm ◽  
Key Issues ◽  
Contact Parameters

One of the key issues in solving contact problems is the correct choice of the contact parameters. The contact stiffness, the penetration limit and the contact algorithm are some of the parameters that have to be adjusted. There are no methodologies available in the literature for choosing the contact parameters, relying only on the user experience for this important task. In this work we investigate how the contact parameters behave in a commercial finite element analysis software. We will show that while the contact stiffness has great influence on the finite element analysis, other parameters will not affect it significantly. Some contact examples are shown to illustrate the performance of the contact parameters during the solution of a contact problem.

Finite Element Study of the Effect of Load Sequence on the Fretting Wear

2020 ◽  
Author(s):  
Pankaj Dhaka ◽  
Raghu V. Prakash
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fretting Wear ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Low Load ◽  
Dimensional Finite Element ◽  
Wear Modelling ◽  
Load Sequence ◽  
Contact Parameters

Abstract Understanding the effect of load sequence is important in the context of a blade-disc dovetail joint in an aero-engine and many other such applications where, the mating surfaces undergo fretting wear under variable slip amplitude loading conditions. In the present work, a two-dimensional finite element analysis is carried out for a cylinder-on-plate configuration. The cylinder is modeled as deformable whereas the plate is modelled as rigid. An incremental wear modelling algorithm is used to model the wear of cylindrical pad while the plate is assumed as un-worn. This simulates a practical scenario where, generally one of the mating surfaces is sufficiently hardened or an interfacial harder/sacrificial element is inserted to restrict the wear to only one of the surfaces. A Fortran-based ABAQUS® subroutine UMESHMOTION is used to simulate the wear profile for the cylinder. A constant extrapolation technique is used to simulate 18000 cycles of fretting. The finite element analysis results are validated with the analytical solutions and literature data. The fretting wear modelling is carried out for two different slip amplitudes viz., 25 μm and 150 μm, to simulate the low and high slip amplitude loading respectively. Two blocks of alternate low and high slip amplitudes are applied to understand the influence of load sequence. Important contact parameters viz., contact pressure, contact stresses and contact slip are extracted. A comparison is made between the low-high and high-low load sequence based on the contact tractions and worn out profiles.

Damage Analysis and Limit Tending Design of Thrust Bearing in esPCP System

2007 ◽  
Vol 345-346 ◽  
pp. 525-528
Author(s):  
Shi Jie Wang ◽  
Kang Jian ◽  
Lv Jianhua
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thrust Bearing ◽  
Contact Problems ◽  
Damage Analysis ◽  
Analysis Software ◽  
Element Analysis ◽  
Optimum Selection ◽  
Material Contact ◽  
Petroleum Oil

Thrust bearing is one of the most important components in esPCP system, which determines the lifespan of the whole system under the restriction of some factors such as the depth of downhole unit, the viscosity of petroleum oil to be pumped. To increase the high temperature bearing ability of the bearings under the limitation of radial size, the damage reason of pre-applied bearings was analyzed. Some different modified plans were put forward from two aspects of structure and material. Contact problems were researched for different plans with finite element analysis software of ANSIS. Comparison of results shows that, in the well of 5½" tube, the optimum selection is ball thrust bearing with 8 balls of radial size of 10mm without keeper.

Adaptive finite element analysis of fractal interfaces in contact problems

2000 ◽  
Vol 182 (1-2) ◽  
pp. 17-37 ◽  
Author(s):  
Guang-Di Hu ◽  
P.D. Panagiotopoulos ◽  
Panagouli ◽  
O. Scherf ◽  
P. Wriggers
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Contact Problems ◽  
Adaptive Finite Element ◽  
Element Analysis

Determination of Contact Stiffness of Rod-Fastened Rotors Based on Modal Test and Finite Element Analysis

2010 ◽  
Vol 132 (9) ◽  
Author(s):  
Yanchun Zhang ◽  
Zhaogang Du ◽  
Liming Shi ◽  
Shaoquan Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Contact Stress ◽  
Contact Stiffness ◽  
Turbine Rotor ◽  
Modal Parameters ◽  
Element Analysis ◽  
Modal Test ◽  
Surface Contact ◽  
The Relationship

A series of simplified rod-fastened rotors, which have different surface contact roughness are manufactured and their modal parameters under different pretightening force, are measured in free-free state. The concept of surface contact stiffness is introduced to simulate the influence of pretightening force on modal parameters of these simplified rod-fastened rotors using finite element method. The experiment measured results are compared and fitted to the finite element analysis results and the relationship between contact stiffness and contact stress is established in which the contact stress is defined by the pretightening force. The relationship is then applied on the modal analysis of a real gas turbine rotor, and its modal test results and finite element analysis results are consistent with each other, proving that the relationship and the described determination method of contact stiffness based on modal test and finite element analysis are effective.

scholarly journals Finite element analysis of general contact problems and application for excavation of shield tunnel.

1998 ◽  
pp. 1-10
Author(s):  
Hiroshi Takeda ◽  
Morito Kusabuka ◽  
Tamotsu Yoshida ◽  
Hiroshi Tanaka ◽  
Nobuko Kurokawa
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Contact Problems ◽  
Shield Tunnel ◽  
Element Analysis

Material Characterization of Tire Cords and the Effects of Cord Thermal-Mechanical Properties on Tires

2004 ◽  
Vol 32 (1) ◽  
pp. 2-22 ◽  
Author(s):  
B. Chen
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Great Influence ◽  
Operating Conditions ◽  
Thermal Shrinkage ◽  
Tire Cord ◽  
Element Analysis ◽  
Thermal Mechanical Properties ◽  
Pneumatic Tires

Abstract Thermal-mechanical properties of tire cords have a great influence on tire dimension, shape, handling, and other performance related issues. This study focuses on characterizing the material properties for polymeric cords and quantifying their effects on pneumatic tires using finite element analysis (FEA). Various tire cord materials, including nylon and polyester, were characterized by obtaining a series of thermal-mechanical properties in the laboratory using tensile testing, thermal shrinkage measurement and creep testing. Prior to obtaining these laboratory measurements, cords in this study were subjected to thermal-mechanical pre-treatments to simulate the effects of curing and tire operating conditions. The properties derived from these measurements were used as input properties for a finite element analysis of a physical tire. Predictions of tire dimensions and shape, loaded footprint and pressure and cord loads were obtained from the FEA model and compared to measured values of the experimental tire. Good agreement was observed between the measured values and those predicted from the finite element analysis; therefore, future FEA studies of pneumatic tires should utilize the techniques developed in this study to characterize tire cord materials.

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