FEM Simulation of Friction Testing Method Based on Combined Forward Rod-Backward Can Extrusion

1997 ◽  
Vol 119 (3) ◽  
pp. 501 ◽  
Author(s):  
Tamotsu Nakamura ◽  
Niels Bay ◽  
Zhi-Liang Zhang
Keyword(s):  
Fem Simulation ◽  
Testing Method ◽  
Friction Testing

FEM Simulation of a Friction Testing Metliod Based on Combined Forward Conical Can-Backward Straight Can Extrusion

1998 ◽  
Vol 120 (4) ◽  
pp. 716-723 ◽  
Author(s):  
Tamotsu Nakamura ◽  
Niels Bay ◽  
Zhi-Liang Zhang
Keyword(s):  
Friction Coefficient ◽  
Metal Forming ◽  
Fem Simulation ◽  
Fem Analysis ◽  
Rigid Plastic ◽  
Workpiece Material ◽  
Testing Method ◽  
Friction Testing ◽  
Mechanical Press ◽  
The Relationship

A new friction testing method based on combined forward conical can-backward straight can extrusion is proposed in order to evaluate friction characteristics in severe metal forming operations. By this method the friction coefficient along the conical punch surface is determined knowing the friction coefficient along the die wall. The latter is determined by a combined forward and backward can extrusion of straight cans. Calibration curves determining the relationship between punch travel, can heights, and friction coefficient for the two tests are calculated based on a rigid-plastic FEM analysis. Experimental friction tests are carried out in a mechanical press with aluminium alloy A6061 as the workpiece material and different kinds of lubricants. They confirm that the theoretical analysis results in reasonable values for the friction coefficient.

Simulation and Analysis on the Best Range of Lift-Off Values in MFL Testing

2013 ◽  
Vol 321-324 ◽  
pp. 811-814 ◽  
Author(s):  
De Hui Wu ◽  
Zhong Yuan Zhang ◽  
Zhen Liang Liu ◽  
Xiao Hao Xia
Keyword(s):  
Mechanical Vibration ◽  
Fem Simulation ◽  
Near Surface ◽  
Testing Method ◽  
Surface Areas ◽  
Field Peak ◽  
Lift Off ◽  
Nondestructive Testing Method ◽  
Strength Of Excitation ◽  
Flux Leakage

As a nondestructive testing method, the magnetic flux leakage (MFL) testing technique is widely used for the testing of surface and near-surface areas in ferromagnetic materials. The MFL field is influenced by parameters of defects, strength of excitation, sensor lift-off value and electromagnetic noises etc. A 2-D finite element method (FEM) simulation model is established in this paper to analyze the influence of lift-off values under the condition of mechanical vibration and electromagnetic noises. The distribution of the MFL field peak for different lift-off values and different depth defects is presented. The defect quantization errors caused by the mechanical vibration and electromagnetic noises are introduced to analyze the influence of lift-off values and electromagnetic noises. The best range of lift-off values can be determined from the results of error analysis. It is effective to improve the measuring accuracy in practical MFL testing.

Friction Testing Method for Open-Grated Steel Bridge Decks

2003 ◽  
Vol 1860 (1) ◽  
pp. 137-143 ◽  
Author(s):  
Richard A. Zimmer ◽  
Bouzid Choubane ◽  
Charles R. Holzschuher
Keyword(s):  
Road Safety ◽  
Standardized Test ◽  
Bridge Decks ◽  
Test Method ◽  
State Agencies ◽  
Steel Bridge ◽  
Friction Characteristics ◽  
Testing Method ◽  
Friction Testing ◽  
Highway Planning

For more than four decades, most of the testing methods and studies for the determination or quantification of friction and texture properties have been concerned primarily with concrete and asphalt paved roadways. However, since the focus of such methods has been mainly on paved roads, other traveled surface types, although part of roadway systems, have been overlooked or simply not addressed directly. As travel safety and efficiency are gaining importance to state agencies, it is imperative to include the atypical travel surfaces, such as bridges with open-grated steel decks, in an appropriate measurement program. To this end, the current study was initiated to identify an appropriate method for measuring the friction characteristics on steel bridge decks. An appropriate standardized test method would provide information that can be effectively used in state road safety and management programs. This method would also provide a tool to ensure that all travel surfaces are constructed and maintained with appropriate friction properties. All the results obtained during this investigation indicated that ASTM E-274 can be appropriately used to assess friction characteristics on both paved surfaces and open-grated steel bridge decks. Such information is critical to support informed highway planning and policy and decision making. In addition, the study findings can be used as a basis to revise the current ASTM standard to include open-grated steel bridge decks.

Mechanical Properties and Friction of AZ31 Magnesium Alloy and Application to the Cylidrical Deep Drawing Process

2017 ◽  
Vol 739 ◽  
pp. 225-230 ◽  
Author(s):  
Tung Sheng Yang ◽  
Guo Zhou Chen
Keyword(s):  
Mechanical Properties ◽  
Deep Drawing ◽  
Elevated Temperatures ◽  
Testing Machine ◽  
Fem Simulation ◽  
Drawing Process ◽  
Stress Strain ◽  
Deep Drawing Process ◽  
Friction Testing ◽  
As Stress

The mechanical properties such as stress-strain curves and anisotropic parameters at different elevated temperatures are obtained by the computerized screw universal testing machine. The friction testing machine is used to determine the friction coefficient between die and AZ31 sheets at different elevated temperatures. The finite element method is used to investigate the earing of the deep drawing process. In order to verify the prediction of FEM simulation of the earing in the cylindrical cup drawing process, the experimental parameters such as stress-strain curves, anisotropic parameters, fiction coefficient and blank holder force, are as the input data during analysis. The experimental cup height compared with the current simulation result of cylindrical deep drawing process at different elevated temperature.

Friction in Double Action Extrusion

2009 ◽  
Vol 424 ◽  
pp. 153-160 ◽  
Author(s):  
Li Liang Wang ◽  
Jie Zhou ◽  
Jurek Duczczyk
Keyword(s):  
Coulomb Friction ◽  
Fem Simulation ◽  
Friction Model ◽  
Extrusion Force ◽  
Testing Method ◽  
Friction Factors ◽  
Wide Range ◽  
Shear Friction ◽  
Friction Models ◽  
Coulomb Friction Model

A novel extrusion testing method, double action extrusion (DAE), to highlight the effect of friction at the die bearing in aluminum extrusion was developed. It was found that the lengths of the extrudates and extrusion force were indeed sensitive to the die bearing length and thus to the friction. FEM simulations of DAE were carried out to evaluate the shear and Coulomb friction models over a wide range of friction factors/coefficients from 0.2 to 1. The full sticking friction appeared to represent the interfacial contact between hot aluminum and die the best. The friction factor values in the shear friction model over a range of 0.3 to 0.6 commonly used to describe the contact at the billet-die interface in FEM simulation appeared to be too low. The comparison between the experimental and simulation results indicated that the shear friction model at m = 1 predicted the extrusion force the best, while the Coulomb friction model at µ = 1 predicted the extrudate lengths the best. Of the existing friction models and friction factors/coefficients, it is recommended to use the shear friction model at m = 1 to describe the friction at the billet-die interface in FEM simulation.

Dry Friction Behaviour of Reaction-Bonded Silicon Carbide at High Temperature

2007 ◽  
Vol 336-338 ◽  
pp. 2472-2474
Author(s):  
Zhen Lin Lu ◽  
Yong Xin Zhou ◽  
Min Zhang ◽  
Qing Wei Huang
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Dry Friction ◽  
Room Temperature ◽  
Xrd Analysis ◽  
Particle Sizes ◽  
Testing Method ◽  
Friction Testing ◽  
Worn Surface ◽  
Scanning Electron

The dry friction behaviors of reaction-bonded silicon carbide (RB-SiC) with different particle sizes were studied at high temperature using pin-on-dick friction testing method. The results showed that the friction coefficient of RB-SiC was the highest at 300°C, and lower at room temperature and 600°C, but the wear rate of RB-SiC would be increased with the increase of temperature. The XRD analysis of grits showed that there was only the amorphous silica in grits at room temperature, whereas the amorphous and crystal silica combined in grits tested at 600 °C. The wear mechanisms of RB-SiC at room temperature and elevated temperature were analyzed by of scanning electron microscopy (SEM) observation on worn surface morphology of RB-SiC.

scholarly journals Analyze engine friction in view of the new WLTC driving cycle

2018 ◽  
Author(s):  
Hannes Allmaier ◽  
David E Sander ◽  
S. Damjanovic ◽  
P. Mallet
Keyword(s):  
Diesel Engine ◽  
Fuel Economy ◽  
Testing Procedure ◽  
Driving Cycle ◽  
Detailed Knowledge ◽  
Testing Method ◽  
Friction Testing ◽  
Engine Friction

With increasingly strict legislation and further the introduction of a new testing procedure WLTP, the highly detailed knowledge of engine friction becomes essential to obtain further fuel economy reductions. In the following, a novel engine friction testing method is used together with a highly accurate simulation to analyze engine friction exemplary for the Renault Energy dCi 130 Diesel engine in great detail and discuss the results in view of the upcoming new testing procedure.

The Important Influencing Factors of Coefficient of Friction Testing on Metallic Sheet and Strip

2012 ◽  
Vol 503-504 ◽  
pp. 529-532
Author(s):  
Huan Xue ◽  
Rong Feng Li ◽  
Hong Chuan Zhu ◽  
Wen Jie Peng
Keyword(s):  
Coefficient Of Friction ◽  
Test Results ◽  
Friction Test ◽  
Testing Method ◽  
Friction Testing ◽  
Specimen Width ◽  
The Coefficient Of Friction ◽  
Strip Testing ◽  
Metallic Sheet ◽  
Lubrication Conditions

The importance of the coefficient of friction test in sheet metal forming field is introduced. Metallic sheet and strip testing method for coefficient of friction is described, the experimental principle of the testing method is introduced. Three important factors, which will obviously effects the test results, including testing mould, specimen width and surface lubrication conditions have been carefully studied. The comparatively stable testing technologies have been developed to guide the test.

The present state of aspirin and clopidogrel resistance

2009 ◽  
Vol 29 (03) ◽  
pp. 285-290 ◽  
Author(s):  
K. E. Guyer
Keyword(s):  
Diagnostic Tests ◽  
Arterial Thrombosis ◽  
Cardiovascular Events ◽  
Treatment Success ◽  
Antiplatelet Agents ◽  
Antiplatelet Drug ◽  
Coronary Syndrome ◽  
Testing Method ◽  
Pharmacological Response ◽  
Platelet Physiology

SummaryAntiplatelet therapy has demonstrated significant clinical benefit in the treatment of acute coronary syndrome. However, as with any treatment strategy it has been unable to prevent all cardiovascular events. This is far from surprising when considering the complexity of arterial thrombosis and more specifically platelet physiology. This lack of treatment success has provoked the introduction of various diagnostic tests and testing platforms with the intent of guiding and optimizing clinical treatment. Such tests have resulted in the generation of clinical data that suggest suboptimal response to antiplatelet agents such as aspirin and clopidogrel.In the case of both aspirin and clopidogrel, this suboptimal response has been termed resistance. Drug resistance would imply a lack of pharmacological response that has not been specifically investigated in many of the clinical studies performed to date. Rather, the term resistance has been used to describe various facets of platelet activation and aggregation relative to the testing method. Many of these measured parameters are not addressed in the therapeutic intent of the antiplatelet drug in question.

Pengujian pada Aplikasi Penggajian Pegawai dengan menggunakan Metode Blackbox

2020 ◽  
Vol 5 (1) ◽  
pp. 61
Author(s):  
Vadlan Febrian ◽  
Muhamad Rizki Ramadhan ◽  
Muhammad Faisal ◽  
Aries Saifudin
Keyword(s):  
Data Entry ◽  
Black Box ◽  
Application Form ◽  
Value Analysis ◽  
Test Function ◽  
Testing Method ◽  
Black Box Testing ◽  
Sample Testing ◽  
Testing Techniques ◽  
Program Error

In this employee payroll application, if there is an error program there will be a loss for employees and the company. Losses for employees, if this application program error occurs then the salary reduction will experience delays due to the difficulty in the process of calculating employee salaries and employees will be late in receiving salaries. Losses for the company, if there is an error program in this application, the company will suffer losses if the employee wants a salary reduction quickly but the company cannot calculate quickly and accurately. In solving this problem, the authors use the black box testing method. Black box testing method is a test that sees the results of execution through test data and ensures the function of the software. Black box testing method has several testing techniques, namely Sample Testing, Boundary Value Analysis, Equivalence Partitions and others. From the testing techniques that have been mentioned, we use the Equivalence Partitions testing technique. Equivalence Partitions are tests that refer to data entry on the employee payroll application form, input will be tested and then put together based on the test function, both valid and invalid values. The expected results of this test are a payroll system for employees who are computerized, have standard rules in the process of developing the program so that it is easy to develop and maintain, and can minimize errors in processing salary calculations for employees.

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