scholarly journals Bending and Torsion Fatigue-Testing Machine Developed for Multiaxial Non-Proportional Loading

Metals ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 1115 ◽  
Author(s):  
Fumio Ogawa ◽  
Yusuke Shimizu ◽  
Stefano Bressan ◽  
Takahiro Morishita ◽  
Takamoto Itoh
Keyword(s):  
Fatigue Life ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Fatigue Tests ◽  
Multiaxial Fatigue ◽  
304 Stainless Steel ◽  
Testing Time ◽  
Loading Conditions ◽  
Proportional Loading ◽  
Bending Loading

A new fatigue-testing machine was developed to perform high-cycle multiaxial fatigue tests at 50 Hz, in order to reduce testing time. The developed machine can combine bending and torsion loading and perform fatigue tests at a high frequency, under proportional and non-proportional loading conditions, where the principal stress direction changes during a cycle. The proportional loading is cyclic bending loading, and the non-proportional loading is cyclic, combining bending and reversed torsion loading. In this study, the effectiveness of the testing machine was verified by conducting tests under these loading conditions, using specimens of type 490A hot-rolled steel and type 304 stainless steel. The fatigue life linked to bending loading obtained using the new testing machine was slightly extended compared with that obtained using the conventional fatigue-testing machine. The fatigue life derived as a result of a combination of bending and torsion was comparable to that obtained using the conventional fatigue-testing machine, although a fatigue limit reduction of 100 MPa was observed compared to the former study. The feasibility of tests using the developed multiaxial fatigue-testing machine was confirmed.

Development of Bending and Torsion Fatigue Testing Machine for Multiaxial Non-Proportional Loading

2016 ◽  
Vol 853 ◽  
pp. 534-538
Author(s):  
Takahiro Morishita ◽  
Takamoto Itoh ◽  
Masao Sakane
Keyword(s):  
Fatigue Testing ◽  
Testing Machine ◽  
Fatigue Tests ◽  
304 Stainless Steel ◽  
Loading Conditions ◽  
Proportional Loading ◽  
Cyclic Bending ◽  
Principal Directions ◽  
Type 304 ◽  
Bending Loading

This study presents a newly developed multiaxial high cycle fatigue testing machine which can load a cyclic bending loading and a reversed torsion loading onto an hour-glass shaped solid bar specimen. This testing machine can perform the fatigue tests with a high frequency under a proportional and a non-proportional loading conditions. In the non-proportional loading, principal directions of stress and strain are changed in a cycle. In the testing machine, the loading is generated by centrifugal force caused by the revolving weights attached to rotational wheels. The maximum frequency of the testing machine is 50Hz. A material tested was a type 304 stainless steel. In the test, two types of loading paths are employed, a proportional loading and a non-proportional loading. The former is a cyclic bending loading and the latter a combining cyclic bending and reversed torsion loading in the developed testing machine. In this study, an applicability of the testing machine is evaluated by carrying out the tests under these loading conditions.

The Influence of Multiaxial Superimposed Static Mean Stress on High-Cycle Fatigue Life of Cu-ETP Copper

2016 ◽  
Vol 250 ◽  
pp. 157-162
Author(s):  
Lukasz Pejkowski ◽  
Dariusz Skibicki ◽  
Mateusz Wirwicki
Keyword(s):  
Fatigue Life ◽  
High Cycle Fatigue ◽  
Fatigue Tests ◽  
Multiaxial Fatigue ◽  
Mean Stress ◽  
Loading Conditions ◽  
Cycle Fatigue ◽  
Proportional Loading ◽  
Mean Stresses

High–cycle multiaxial fatigue tests under proportional and non-proportional loading conditions with various combinations of superimposed static mean stresses was carried out on Cu-ETP copper. The results show differences in fatigue life between various ratios of mean stresses. These results are similar to others described in the literature.

scholarly journals Multiaxial fatigue study on steel transversal attachments under constant amplitude proportional and non-proportional loadings

2018 ◽  
Vol 165 ◽  
pp. 16007
Author(s):  
Martin Garcia ◽  
Claudio A. Pereira Baptista ◽  
Alain Nussbaumer
Keyword(s):  
Fatigue Life ◽  
High Strength ◽  
Fatigue Tests ◽  
Multiaxial Fatigue ◽  
Life Assessment ◽  
Experimental Program ◽  
Proportional Loading ◽  
Load Carrying ◽  
Stress States ◽  
Experimental Values

In this study, the multiaxial fatigue strength of full-scale transversal attachment is assessed and compared to original experimental results and others found in the literature. Mild strength S235JR steel is used and an exploratory investigation on the use of high strength S690QL steel and the effect of non-proportional loading is presented. The study focuses on non-load carrying fillet welds as commonly used in bridge design and more generally between main girders and struts. The experimental program includes 33 uniaxial and multiaxial fatigue tests and was partially carried out on a new multiaxial setup that allows proportional and non-proportional tests in a typical welded detail. The fatigue life is then compared with estimations obtained from local approaches with the help of 3D finite element models. The multiaxial fatigue life assessment with some of the well-known local approaches is shown to be suited to the analysis under multiaxial stress states. The accuracy of each models and approaches is compared to the experimental values considering all the previously cited parameters.

scholarly journals Fatigue Testing and Evaluation of Fatigue Strength under Multiaxial Stress State; Why do we need fatigue testing?

2018 ◽  
Vol 159 ◽  
pp. 01050
Author(s):  
Takamoto Itoh ◽  
Fumio Ogawa ◽  
Takahiro Morishita
Keyword(s):  
Hollow Cylinder ◽  
Compression Test ◽  
Fatigue Testing ◽  
Biaxial Tension ◽  
Fatigue Tests ◽  
Multiaxial Fatigue ◽  
Proportional Loading ◽  
Loading Test ◽  
Inner Pressure ◽  
Failure Life

Types of multiaxial fatigue tests and their experimental results are presented in this paper. There are typical three types in multiaxial fatigue tests: the combining push-pull and reversed torsion loading test using hollow cylinder specimen, the biaxial tension-compression test using cruciform specimen and the inner pressure applied the push-pull loading test using the hollow cylinder specimen. In the combining a push-pull loading and a reversed torsion loading test, failure life under non-proportional loading in which principal directions of stress and strain were changed in a cycle was shortened compared to proportional loading in which those are fixed. Fatigue lives were well-correlated using a non-proportional strain range considering the effect of strain path and material dependence. In the biaxial tension-compression test, the failure life decreased with increase of the principal strain ratio. In the inner pressure applied the push-pull loading test, cyclic deformation behaviour due to complex loading paths of multiaxial fatigue tests with the inner pressure associated with push-pull and rev. torsion acted to reduce the failure lives. Experimental investigation of multiaxial failure life and elucidation of their governing mechanism is essential and it can broaden the applicability of structural components.

Block-Programme Fatigue Testing of Automobile Wheel Spindles

1973 ◽  
Vol 187 (1) ◽  
pp. 295-299 ◽  
Author(s):  
J. D. Tedford ◽  
B. Crossland
Keyword(s):  
Fatigue Life ◽  
Fatigue Testing ◽  
Normal Load ◽  
Mean Value ◽  
Fatigue Tests ◽  
Test Sequence ◽  
Testing Time ◽  
Constant Frequency ◽  
Stress Levels ◽  
Life Function

The paper reports the results of fatigue tests carried out on Ford Capri wheel spindle bodies. The first three programmes were aimed at investigating the effect of the sequence in which the loads were applied in a multilevel constant-frequency block programme. A further programme was carried out to investigate the effect on the fatigue life of removing the low-load cycles from the test sequence. The first three programmes demonstrated that the sequence in which individual blocks were applied had no significant effect on the fatigue life. From the fourth programme it was concluded that the removal of stress levels equal to and less than 1·75 times the r.m.s. (root mean square) value of the normal load frequency distribution had no effect on the fatigue damage. If these stress levels are removed there is an 87 1/2 per cent reduction in testing time. The slopes of the life function curves for all four programmes were nearly identical, and gave a mean value of 6·9 which is in agreement with other workers. Lastly it was concluded that tests on small notched cantilever specimens led to very similar conclusions, and that such specimens could be used for proving and developing testing programmes.

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.

Block-Programme Fatigue Testing of Automobile Wheel Spindles

1973 ◽  
Vol 187 (1) ◽  
pp. 295-299 ◽  
Author(s):  
J. D. Tedford ◽  
B. Crossland
Keyword(s):  
Fatigue Life ◽  
Fatigue Testing ◽  
Normal Load ◽  
Mean Value ◽  
Fatigue Tests ◽  
Test Sequence ◽  
Testing Time ◽  
Constant Frequency ◽  
Stress Levels ◽  
Life Function

The paper reports the results of fatigue tests carried out on Ford Capri wheel spindle bodies. The first three programmes were aimed at investigating the effect of the sequence in which the loads were applied in a multilevel constant-frequency block programme. A further programme was carried out to investigate the effect on the fatigue life of removing the low-load cycles from the test sequence. The first three programmes demonstrated that the sequence in which individual blocks were applied had no significant effect on the fatigue life. From the fourth programme it was concluded that the removal of stress levels equal to and less than 1·75 times the r.m.s. (root mean square) value of the normal load frequency distribution had no effect on the fatigue damage. If these stress levels are removed there is an 87 1/2 per cent reduction in testing time. The slopes of the life function curves for all four programmes were nearly identical, and gave a mean value of 6·9 which is in agreement with other workers. Lastly it was concluded that tests on small notched cantilever specimens led to very similar conclusions, and that such specimens could be used for proving and developing testing programmes.

scholarly journals Flexural Fatigue Behaviors of Silicon Carbide Recycled Concrete in Corrosive Environments

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Jinzhi Zhou ◽  
Tiantian Fu ◽  
Chuheng Zhong ◽  
Kun Peng ◽  
Ziyang Shuang
Keyword(s):  
Silicon Carbide ◽  
Fatigue Life ◽  
Failure Probability ◽  
Fatigue Testing ◽  
Testing Machine ◽  
Fatigue Tests ◽  
Recycled Concrete ◽  
Flexural Fatigue ◽  
Corrosive Environments ◽  
The Relationship

An experimental study on the flexural fatigue behaviors of recycled concrete (RC) and silicon carbide recycled concrete (SiCRC) was conducted. The immersion time was 0 d, 30 d, 60 d, and 90 d in 5% NaCl solution for these two kinds of recycled concrete specimens, respectively, and then, four-point flexural fatigue tests were performed by MTS fatigue testing machine. The fatigue life for varying stress levels ranging from 0.9 to 0.6 was obtained. The fatigue life was given considering the failure probability according to the fatigue life and stress level of the specimen via the logarithmic normal distribution and Weibull distribution, respectively. The relationship between fatigue life and failure probability was also obtained. The fatigue life with failure probability of 1% and 50% was further predicted. The results showed that the fatigue life of RC and SiCRC increased in corrosive environments. The fatigue life of SiCRC is higher than that of RC, and the incorporation of SiCRC can improve the fatigue life of recycled concrete.

Multiaxial Fatigue Life Prediction of Metallic Materials Based on Critical Plane Method under Non-Proportional Loading

2017 ◽  
Vol 730 ◽  
pp. 516-520 ◽  
Author(s):  
Er Nian Zhao ◽  
Wei Lian Qu
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Multiaxial Fatigue ◽  
Fatigue Life Prediction ◽  
Metallic Materials ◽  
Loading Conditions ◽  
Critical Plane ◽  
Proportional Loading ◽  
Plane Method ◽  
Strain Paths

The critical plane method is widely discussed because of its effectiveness for predicting the multiaxial fatigue life prediction of metallic materials under the non-proportional loading conditions. The aim of the present paper is to give a comparison of the applicability of the critical plane methods on multiaxial fatigue life prediction. A total of 205 multiaxial fatigue test data of nine kinds of metallic materials under various strain paths are adopted for the experimental verification. Results shows that the von Mises effective strain parameter and KBM critical plane parameter can give well predicted fatigue lives for multiaxial proportional loading conditions, but give poor prediction lives evaluation for multiaxial non-proportional loading conditions. However, FS parameter shows better accuracy than the KBM parameter for multiaxial fatigue prediction for both proportional and non-proportional loading conditions.

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