scholarly journals Prediction of fatigue life of aluminum 2024-T3 at low temperature by finite element analysis

2020 ◽  
Vol 14 (3) ◽  
pp. 7170-7180
Author(s):  
S. Mazlan ◽  
N. Yidris ◽  
R. Zahari ◽  
E. Gires ◽  
D.L.A. Majid ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Low Temperature ◽  
Load Ratio ◽  
Fatigue Tests ◽  
Element Analysis ◽  
Cooling Chamber ◽  
Loading Tests ◽  
Cyclic Loading Tests ◽  
Design Factors ◽  
Ansys Workbench

The change in material properties at low temperature has always been one of the concerned design factors in aircraft industries. The wings and fuselage are repeatedly exposed to sub zero temperature during cruising at high altitude. In this study, fatigue tests were conducted on standard flat specimens of aluminum 2024-T3 at room temperature and at -30 °C. The monotonic and cyclic loading tests were conducted using MTS 810 servo hydraulic machine equipped with a cooling chamber. The monotonic tests were conducted at a crosshead speed rate of 1 mm/min and the cyclic tests at a frequency of 10 Hz with a load ratio of 0.1. The experimental data obtained, such as the yield strength, ultimate strength and S-N curve were used as the input parameters in ANSYS Workbench 16.1. This close agreement demonstrates that the isotropic model in ANSYS workbench is essential in predicting fatigue life. The increase in stress parameter causes fatigue life to decrease. Besides, the decrease in temperature causes the total fatigue life to increase.

Deformation Capacity of Steel Shear Panel Damper and its Reflection to AIJ Design Requirements

2016 ◽  
Vol 11 (1) ◽  
pp. 125-135 ◽  
Author(s):  
Hiroyuki Tamai ◽  
◽  
Kazuhiko Kasai ◽  
Keyword(s):  
Fatigue Life ◽  
Cyclic Loading ◽  
Low Cycle Fatigue ◽  
Thickness Ratio ◽  
Deformation Capacity ◽  
Shear Buckling ◽  
Loading Tests ◽  
Cyclic Loading Tests ◽  
Shear Panel ◽  
Shear Panel Damper

Shear panel dampers consisting of stiffeners and panels surrounded by four flanges are used as aseismic hysteretic dampers for buildings in Japan. Cracks can form easily in a shear panel damper when shear buckling occurs during the cyclic loading caused by a severe earthquake.For a relatively thin panel with a large width-to-thickness ratio, the damper’s plastic deformation capacity and the presence of shear buckling can be evaluated from the maximum deformation angle. However, when it is relatively small, very-low-cycle fatigue life for a relatively thick panel must be known to predict the usage limit of the damper, because the failure pattern changes when cracks form in the weld between the panels and flanges. Fatigue life relations for a thick shear panel damper with parameters of normalized width-to-thickness ratio and deformation angle are presented. A method for predicting the fatigue life under severe earthquake conditions is also presented. To validate the prediction expression, cyclic loading tests were performed on a shear panel damper and reviewed. The applicability of the method for predicting the fatigue life was confirmed through non-stationary cyclic loading tests. These results showed the validity and effectiveness of the expressions and the method.

A Study on Fatigue Behavior of SM490A Steel under Low Temperature

2007 ◽  
Vol 353-358 ◽  
pp. 142-145 ◽  
Author(s):  
Ki Weon Kang ◽  
Byeong Choon Goo ◽  
J.H. Kim ◽  
Heung Seob Kim ◽  
Jung Kyu Kim
Keyword(s):  
Fatigue Life ◽  
Low Temperature ◽  
Test Temperature ◽  
Fatigue Testing ◽  
Fatigue Behavior ◽  
Testing Machine ◽  
Fatigue Tests ◽  
Static Strength ◽  
Experimental Results ◽  
Railway Vehicle

This paper deals with the fatigue behavior and its statistical properties of SM490A steel at various temperatures, which is utilized in the railway vehicle. For these goals, the tensile ad fatigue tests were performed by using a servo-hydraulic fatigue testing machine at three temperatures: +20°C, -10°C and -40°C. The static strength and fatigue limits of SM490A steel were increased with decreasing of test temperature. The probabilistic properties of fatigue behavior are investigated by means of probabilistic stress-life (P-S-N) curve and they are well in conformance with the experimental results regardless of temperature. Also, based on P-S-N curves, the variation of fatigue life is investigated and as the temperature decreases, the variation of fatigue life increases moderately.

Fatigue Life Evaluation of Vehicle Wheel Bolts under Random Loading

2005 ◽  
Vol 297-300 ◽  
pp. 1770-1775 ◽  
Author(s):  
Young Woo Choi ◽  
Byeong Wook Noh ◽  
Kyung Chun Ham ◽  
Sung In Bae
Keyword(s):  
Fatigue Life ◽  
Residual Life ◽  
Three Dimensional ◽  
Real Life ◽  
Local Stress ◽  
Tensile Tests ◽  
Fatigue Tests ◽  
Random Loading ◽  
Element Analysis ◽  
Three Dimensional Finite Element

The fatigue life of hexagon head and socket head bolts, attached to vehicle a wheel, is assessed and the estimation of the residual life of existing bolts in vehicle wheel is investigated. Field- measured load histories were applied in this test. Tensile tests and fatigue tests were performed to evaluate the effect of tightening torque and to obtain the basic experimental data. A three-dimensional finite element analysis was also performed to evaluate the local stress fields. Miner’s rule was used to predict the fatigue life of bolts. The results indicate the prediction of fatigue life of the bolts was in good agreement with the real life of vehicle wheel bolts in this test.

Engine Crankshaft Remanufacturing Life Prediction and Experimental Verification

2011 ◽  
Vol 215 ◽  
pp. 263-271
Author(s):  
Guo Qing Zhang ◽  
Hai Bo Lin
Keyword(s):  
Fatigue Life ◽  
Damage Model ◽  
Local Stress ◽  
Fatigue Tests ◽  
Element Analysis ◽  
Fatigue Life Estimation ◽  
Before And After ◽  
Injury Models ◽  
Engine Crankshaft ◽  
Strain Method

In this paper, the engine crankshaft remanufacturing life was estimated before and after. As long as the known material properties, loading, local stress, and then select the appropriate fatigue damage model can predict the fatigue life estimation. Material parameters of the experiment and the approximate method are obtained; load is on the basis of dynamic simulation; local stress obtained by finite element analysis; injury models were selected: the uniaxial damage model S-N method and multi-axis model of damage is strain method, SWT-Bannantine method, shear strain method, Fatemi-Socie method. New crankshaft and 500 hours, 1000 hours and 3000 hours after the crankshaft bench fatigue tests were conducted, and the experimental results were compared to verify the correctness of the theoretical calculation, and explain the crankshaft to remanufacture the fatigue life is sufficient.

A Study on the Fatigue Life Prediction and Evaluation of the Natural Rubber Components for Automobile Vehicles

2006 ◽  
Vol 326-328 ◽  
pp. 589-592
Author(s):  
Chang Su Woo ◽  
Wan Doo Kim ◽  
Jae Do Kwon
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Life ◽  
Natural Rubber ◽  
Fatigue Damage ◽  
Damage Parameter ◽  
Fatigue Tests ◽  
Element Analysis ◽  
Engine Mount ◽  
Lagrange Strain

The fatigue analysis and lifetime evaluation are very important in design procedure to assure the safety and reliability of the rubber components. The interest of the fatigue life of rubber components such as the engine mount is increasing according to the extension of warranty period of the automotive components. In this study, the fatigue lifetime prediction methodology of the vulcanized natural rubber was proposed by incorporating the finite element analysis and fatigue damage parameter determined from fatigue tests. Finite element analysis of 3D dumbbell specimen of natural rubber was performed based on a hyper-elastic material model determined from the tension, compression and shear tests. The Green-Lagrange strain at the critical location determined from the finite element analysis was used for evaluating the fatigue damage parameter of the natural rubber. Fatigue tests were performed using the 3D dumbbell specimens with different levels of maximum strain and various load. The basic mechanical properties test and the fatigue test of rubber specimens under the normal and elevated temperature were conducted. Fatigue life curves can be effectively represented by a following single function using the maximum Green-Lagrange strain. Fatigue lives of the natural rubber are predicted by using the fatigue damage parameters at the critical location. Predicted fatigue lives of the engine mount agreed fairly with the experimental fatigue lives a factor of two.

The Effect of Residual Stress on Fatigue Life of Welded Cruciform Joints of 16MnR for Train Bogie

2013 ◽  
Vol 815 ◽  
pp. 695-699 ◽  
Author(s):  
Ying Xia Yu ◽  
Bo Lin He ◽  
Jian Ping Shi ◽  
Jing Liu
Keyword(s):  
Residual Stress ◽  
Plastic Deformation ◽  
Fatigue Life ◽  
Load Ratio ◽  
Fatigue Tests ◽  
Residual Tensile Stress ◽  
Cruciform Joints ◽  
Weld Toe ◽  
Deformation Layer ◽  
Cruciform Joint

The weld toe surface and its nearby area of welded cruciform joints were treated by ultrasonic impact. Under the same stress concentration and after heat treatment to eliminate residual stress, the effect of residual stress on the fatigue life of joint was researched. The fatigue tests are performed on the joints of 16MnR both for the un-treated and treated joints by using EHF-EM200K2-070-1A type fatigue tester when the load ratio is 0.1, frequency is 10Hz. The experimental results indicate that the severe plastic deformation in the vicinity of weld toe surface was formed by impact treating for 2 minutes, the thickness of the plastic deformation layer is about 60μm. Residual tensile stress in the weld toe surface can be changed to residual compressive stress by impact treatment. The fatigue life of welded joint is 0.260×106cycle, and the fatigue life of treated joint is 0.499×106cycle. Compared to the un-treated joint, the fatigue life of treated joint has been increased by 91.92%. The residual stress contributed to fatigue life is about 16%. Residual stress has great effect on the fatigue life of welded cruciform joint.

Fatigue Life Evaluation of Automotive Engine Mount Insulator

2008 ◽  
Vol 385-387 ◽  
pp. 649-652
Author(s):  
Chang Su Woo ◽  
Wan Doo Kim ◽  
Shin Hur
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Biaxial Tension ◽  
Material Model ◽  
Damage Parameter ◽  
Fatigue Tests ◽  
Element Analysis ◽  
Automotive Engine ◽  
Engine Mount ◽  
Lagrange Strain

Fatigue life of automotive engine mount insulator made of natural rubber was evaluated. In order to develop an appropriate fatigue damage parameter of the rubber material, a series of displacement controlled fatigue tests was conducted using 3-dimensional dumbbell specimens with different levels of mean displacement. It was shown that the maximum Green-Lagrange strain was a proper damage parameter, taking the mean displacement effects into account. Nonlinear finite element analyses of the rubber engine mount insulator and 3D dumbbell specimen were performed based on a hyper-elastic material model determined from the simple and equi-biaxial tension tests. Fatigue life prediction of the engine mount insulator was made by incorporating the maximum Green-Lagrange strain values, which was evaluated from the finite element analysis and fatigue tests, respectively. Predicted fatigue lives of the engine mount insulator showed a fairly good agreement with the experimental fatigue lives.

Self Loosening Behavior of Metal Thread Joints under Transverse Cyclic Loading

2007 ◽  
Vol 340-341 ◽  
pp. 1467-1472 ◽  
Author(s):  
Naoya Nishimura ◽  
Toshio Hattori ◽  
Minoru Yamashita ◽  
Naoyuki Hayakawa
Keyword(s):  
Cyclic Loading ◽  
Thread Joint ◽  
Element Analysis ◽  
Sliding Motion ◽  
Axial Tension ◽  
Machine Element ◽  
The Finite Element Analysis ◽  
Loading Tests ◽  
Cyclic Loading Tests ◽  
Relative Slippage

Considering the productivity and the maintenance, most of machine and product has many joints (fastening, welding and adhesive joint). Especially, the thread joint has been used the most mainly as a machine element. However, many troubles on strength and reliability of these machine and product are generating in these joints. In this paper, we have evaluated the sliding and the self loosening behavior of thread joints under transverse loading, where the entire response of the thread joint portion exhibits an inelastic one. The finite element analysis using a simple model of thread joints with respect to the relative sliding motion between the parts was performed and compared with the experimental results under quasi-static loading. The critical relative slippage (Scr), less than the value which thread joints can keep the fastening, was obtained by the result of cyclic loading tests. In addition, this critical relative slippage was estimated according to the theoretically obtained equation considering the bolt bending and the geometrical constraint condition. The inclination compliance (kw) of the bolt head used in this equation was evaluated by the comparison of experimental and analytical results from theoretical equation. In consideration of the nonlinearity of kw with respect to the bolt axial tension, the Scr is well estimated by this equation.

Finite Element Analysis of Model SZX20×2 Low Temperature Twin-Screw Oil Press

2013 ◽  
Vol 380-384 ◽  
pp. 91-94
Author(s):  
Jun Jie Wang ◽  
Yong Lin Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Low Temperature ◽  
Static Analysis ◽  
Natural Frequencies ◽  
Vibration Mode ◽  
Geometric Model ◽  
Element Analysis ◽  
Twin Screw ◽  
Ansys Workbench

Worm is the executive component of the twin-screw oil press, and the design of the worm effect the performance of twin-screw oil press. In this paper the 3-dimensioned geometric model of the worm was established with SolidEdge, the static analysis for the established model was finished and the natural frequency of the worm was analyzed with ANSYS Workbench. Then the first six level natural frequencies and vibration mode were obtained, which provide the basis for dynamic analysis of the worm.

scholarly journals Pengaruh Beban terhadap Prediksi Umur Fatik Rangka Meja Kerja Balai LAPAN Garut Menggunakan Ansys Workbench

2020 ◽  
Vol 4 (2) ◽  
pp. 57
Author(s):  
Lasinta Ari Nendra Wibawa ◽  
Kuncoro Diharjo
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Safety Factor ◽  
Life Prediction ◽  
Fatigue Life Prediction ◽  
Element Analysis ◽  
Stress Theory ◽  
Minimum Age ◽  
Minimum Safety Factor ◽  
Ansys Workbench

The study examines the effect of the load on fatigue life prediction of a workbench frame using the finite element method. The design of the workbench frame uses Autodesk Inventor Professional 2017, while finite element analysis uses Ansys Workbench. The workbench frame is subjected to loads 150, 175, 200, and 225 kg with a fully-reserved type of loading. Fatigue life prediction using Gerber's mean stress theory. The material of the workbench frame using Aluminum alloy 6061. The simulation results show that the workbench frame has a minimum fatigue life for loads of 150, 175, 200, and 225 kg, respectively 1 x 108, 6.61 x 107, 1.69 x 107, and 4.09 x 106 cycles. Whereas the minimum safety factor for fatigue life is 150, 175, 200, and 225 kg, respectively 1.395; 1,196; 1,046; and 0.930. It shows the workbench frame can withstand the fatigue life to a minimum of 107 cycles for a load of 150, 175, and 200 kg because it has a safety factor of more than 1. While for the 225 kg load, the workbench frame fails to reach a minimum age of 107 cycles due to fatigue life prediction is only 4.09 x 106 cycles with a safety factor of less than 1, which is 0.930.

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