Conformal Cylindrical Contact Force Model Verification using a Finite Element Analysis

2011 ◽  
Author(s):  
C. Pereira ◽  
A. Ramalho ◽  
J. Ambrósio
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Contact Force ◽  
Model Verification ◽  
Force Model ◽  
Element Analysis ◽  
Contact Force Model

Chatter Stability Prediction of Cutting Process With Process Damping Utilizing Finite Element Analysis

2020 ◽  
Author(s):  
Norikazu Suzuki ◽  
Tomoki Nakanomiya ◽  
Eiji Shamoto
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Vibration Amplitude ◽  
Cutting Process ◽  
Force Model ◽  
Chatter Stability ◽  
Chatter Vibration ◽  
Damping Force ◽  
Element Analysis ◽  
Process Damping

Abstract This paper presents a new approach to predict chatter stability in cutting considering process damping. Traditional chatter stability analysis methods enable to predict stable or unstable conditions. Under unstable conditions, the chatter vibration can increase theoretically infinitely. However, chatter vibration is damped at a certain amplitude in real process due to process damping, i.e., the cutting process is stabilized by means of tool flank face contact to the machined surface. In order to consider the influence of the process damping, a simple process damping force model is introduced. The process damping force is assumed to be proportional to the structural displacement. The process damping coefficient is a function of the vibration amplitude and the wavelength. In order to identify the coefficients, a series of finite element analysis is conducted in the present study. Identified coefficients are introduced into the conventional zero-order-solution in frequency domain. The proposed model calculates chatter stability limit assuming process damping with finite amplitude. Hence, this analysis enables to estimate the amplitude-dependent quasi-stable conditions. Analytical results for thee face turning operation demonstrated influence of process damping effect on resultant vibration amplitude quantitatively.

Simulation of Finite Element Analysis for Cutting Force of High-Speed Dry Gear Milling by Flying Cutter

2011 ◽  
Vol 86 ◽  
pp. 100-103
Author(s):  
Qian Guo ◽  
Chao Lin ◽  
Wei Quan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Comparative Analysis ◽  
Cutting Force ◽  
High Speed ◽  
Cutting Parameters ◽  
Force Model ◽  
Cutting Force Model ◽  
Element Analysis ◽  
Gear Hobbing

This paper makes the emulate experimental research of cutting force in high-speed dry gear milling by flying cutter with finite element analysis method by using the established cutting force model yet, makes the comparative analysis for the result of simulation experiment and theoretical calculation, verifies the correctness of cutting force model and calculation method, makes the comparative analysis for the influencing relations and changing laws of cutting force and cutting parameters and so many factors, and reveals the cutting mechanism of high-speed dry gear milling by flying cutter initially. By the research of this paper, it provides basic theory for subsequent cutting machine technology of high-speed dry gear hobbing, and establishes the theoretical basis for the spread and exploitation of this technology.

An Improved Heat Equation for Fully Coupled Thermal-Structural Finite Element Analysis Using Small Strain Formulation

2014 ◽  
Vol 611 ◽  
pp. 294-303
Author(s):  
Ladislav Écsi ◽  
Pavel Élesztős
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Heat Equation ◽  
Mathematical Formulation ◽  
Model Verification ◽  
Cyclic Plasticity ◽  
Ductile Material ◽  
Element Analysis ◽  
Wide Range ◽  
Fully Coupled

In this paper an improved heat equation for fully coupled thermal structural finite element analysis is presented. In the problem solving process, mathematical formulation appropriate strain measures describing the onset and the growth of ductile and total damage and heat generation rate per unit volume for dissipation-induced heating have been employed. The model was implemented into a finite element code using an improved weak form for fully coupled thermal structural finite element analysis, an extended NoIHKH material model with internal damping for cyclic plasticity of metals capable of modelling ductile material behaviour in wide range of strain rates. A notched aluminium alloy specimen in cyclic tension using 2Hz excitation frequency and linearly increasing amplitude has been studied. The model verification showed excellent agreement with available experiments. A few selected analysis results are presented and briefly discussed.

Analysis to Milling Force Base on AdvantEdge Finite Element Analysis

2014 ◽  
Vol 981 ◽  
pp. 895-898
Author(s):  
Fu Cai Zhang ◽  
Qing Wang ◽  
Ru Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Simulation Analysis ◽  
Cutting Parameters ◽  
Milling Process ◽  
Force Model ◽  
Cnc Milling ◽  
Milling Force ◽  
Element Analysis ◽  
Milling Force Model

Aiming at NC milling processing simulation problem, a ball-end cutter milling force model is established, the numerical simulation analysis of aluminum alloy AL2024 milling process is conducted by using the finite element analysis software AdvantEdge finite element analysis. Focus on the Milling force simulation, the size of the milling force is obtained by simulating calculation. Using the same cutting parameters for milling experiment, the results show that simulation analysis of the cutting force values ​​are in good agreement with the experimental results，the milling force model prior established is correct. The research laid a foundation for the perfect CNC milling simulation system.

Elastic-Plastic Finite Element Analysis of Nonsteady State Partial Slip Wheel-Rail Rolling Contact

2005 ◽  
Vol 127 (4) ◽  
pp. 713-721 ◽  
Author(s):  
Zefeng Wen ◽  
Xuesong Jin ◽  
Yanyao Jiang
Keyword(s):  
Finite Element Analysis ◽  
Plastic Deformation ◽  
Finite Element ◽  
Residual Stresses ◽  
Contact Force ◽  
Rolling Contact ◽  
Element Analysis ◽  
Normal Contact ◽  
Nonsteady State ◽  
Residual Stresses And Strains

A finite element analysis with the implementation of an advanced cyclic plasticity theory was conducted to study the elastic-plastic deformation under the nonsteady state rolling contact between a wheel and a rail. The consideration of nonsteady state rolling contact was restricted to a harmonic variation of the wheel-rail normal contact force. The normal contact pressure was idealized as the Hertzian distribution, and the tangential force presented by Carter was used. Detailed rolling contact stresses and strains were obtained for repeated rolling contact. The harmonic variation of the normal (vertical) contact force results in a wavy rolling contact surface profile. The results can help understand the influence of plastic deformation on the rail corrugation initiation and growth. The creepage or stick-slip condition greatly influences the residual stresses and strains. While the residual strains and surface displacements increased at a reduced rate with increasing rolling passes, the residual stresses stabilize after a limited number of rolling passes. The residual stresses and strains near the wave trough of the residual wavy deformation are higher than those near the wave crest.

scholarly journals Numerically Efficient Three-Dimensional Model for Non-Linear Finite Element Analysis of Reinforced Concrete Structures

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1578
Author(s):  
Sławomir Dudziak
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Shear Failure ◽  
Load Capacity ◽  
Model Verification ◽  
Element Analysis ◽  
Rc Structures ◽  
Linear Finite Element ◽  
Non Linear

The paper concerns the non-linear finite element analysis (NLFEA) of Reinforced Concrete (RC) structures for engineering applications. The required level of complexity of constitutive models for such analysis was discussed and non-linear elastic models combined with the smeared cracking approach proved to be efficient. A new constitutive hypoelastic-brittle model of concrete based on these assumptions was proposed. Moreover, a method including the tension stiffening effect (TS) was developed. This phenomenon is connected with the bond properties between concrete and steel and, in some situations, has significant influence on the deflections of RC structures. It is often neglected by or included in the constitutive model of concrete. In the paper, an alternative approach was presented, in which this phenomenon is taken into account by generalising the material model of reinforcing steel. This approach is consistent with modern design standards and has solid physical foundations. The proposed models were implemented in the Abaqus code via UMAT user’s procedure coded in FORTRAN. Model verification and validation were presented in four case studies, concerning: a Willam’s test (examination on material point level), a beam with bending failure, and two beams with shear failure (with and without stirrups). The obtained results were compared with experimental outcomes and numerical results obtained by other researchers. The presented approach enables the accurate prediction not only of load capacity but of structural deformability, due to the precise description of TS. Thus, it promises to be a useful engineering tool.

A Nodal Load Model of 3-D Finite Element Analysis for a Crankshaft of a Truck-Mounted Compressor

1997 ◽  
Author(s):  
Si-zhu Zhou ◽  
J. G. Dang ◽  
Jacob Jen-Gwo Chen
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Working Conditions ◽  
Oil Field ◽  
Force Model ◽  
Element Analysis ◽  
Gas Engine ◽  
Load Model ◽  
Equivalent Nodal Forces

In order to analyze the stresses and deformations of a crankshaft of a truck-mounted compressor by means of finite element method, the most important and difficult thing is how to determine the external force model on a crankshaft. The objective of this paper is to present a new load model of 3-D finite element analysis for a crankshaft of a truck-mounted compressor used in an oil field, i.e., the contacting-distribution forces are transferred into equivalent nodal forces. Firstly, the contacting-distribution forces between the crankshaft and the links are analyzed; secondly, formulations of equivalent node forces for the working conditions of 0° and 75° are deduced; finally, the crankshaft of a gas-engine driven truck-mounted compressor is taken as an illustration.

Non-Linear Finite Element Analysis of a Pipe Denting Problem During a Pipe Transfer Operation

2004 ◽  
Author(s):  
Hazel M. Pierson ◽  
Daniel H. Suchora ◽  
Anthony V. Viviano
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Kinetic Energy ◽  
Contact Force ◽  
Element Model ◽  
Total System ◽  
Pipe Material ◽  
Deflection Curve ◽  
Element Analysis ◽  
Physical Test

This paper investigates the problem of a pipe rolling down a transfer skid and becoming permanently dented as it hits the stops at the end of the skid. See Figure 1. The transfer skid stops under consideration had been successfully used in other applications. However, in this application there was an increase in distance between stations connected by the transfer skid. Thus, as the pipe rolled down the skid it built up significant kinetic energy, which needed to be dissipated upon impact with the skid stop. Unfortunately in this case, the skid stops did not always absorb enough energy to ensure integrity of the pipe. Consequently, certain sizes and grades of pipe experienced denting as they would impact the stops. The skid stop and the pipe must absorb the total kinetic energy possessed by the pipe just before impact. The energy absorbing characteristics of both the skid stop and pipe were developed using a static method. For the skid stop a physical test was performed to obtain the contact force versus deflection curve. For the pipe a finite element analysis was conducted to determine the contact force versus deflection curve. In the finite element model the effect of local yielding of the pipe material was incorporated into the analysis. The energy absorbed by each component was estimated as the area under the contact force-deflection curve and for each component the energy absorbed versus contact force curve was developed. Combining these two results gives the total system energy absorbed by both the pipe and skid stop as a function of contact force. This is compared to the total energy in the pipe just before contact to determine the actual maximum contact force and the actual energy absorbed by each component. The energy that could be elastically given back to the system was also obtained from the model. These results were compared to actual field measurements of dent size and pipe rebound height. The comparisons proved the validity of the model.

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