scholarly journals 20 kHz 3-point bending fatigue of automotive steels

2018 ◽  
Vol 165 ◽  
pp. 22020
Author(s):  
Mohamed Sadek ◽  
Jens Bergström ◽  
Nils Hallbäck ◽  
Christer Burman
Keyword(s):  
Fatigue Strength ◽  
Fatigue Test ◽  
Pearlitic Steel ◽  
Fatigue Tests ◽  
Test Rig ◽  
Staircase Method ◽  
Bending Fatigue ◽  
Load Frequency ◽  
Bending Fatigue Test ◽  
Short Time

The 20 kHz load frequency enables fatigue tests for very high cycle fatigue life, 109-1013 cycles, within conveniently short time. In automotive applications, many components are subjected to flexural loading and hence bending fatigue is an important test mode. Ultrasound fatigue test instruments have been used successfully in several assessments of fatigue strength and more commonly in uniaxial loading. Here, a 3-point bending fatigue test rig operating in resonance at 20 kHz load frequency has been designed to test plane specimens at R=0.1 loading. The test rig design and stress calculations are presented. Testing for fatigue strength was conducted using the staircase method with 15 specimens of each steel grade, specimens reaching 108 cycles were considered run-outs giving fatigue strength at 108 cycles. Additional 15 specimens of each grade were tested for S-N curves with the upper limit above 109 cycles. Two different common automotive steels, 38MnSiV5, a micro-alloyed ferritic-pearlitic steel, and 16MnCr5, a carburizing martensitic steel, were tested. The fatigue strengths achieved from the staircase testing are 340 and 419 MPa stress amplitudes for the 38MnSiV5 and 16MnCr5 steels, respectively. The S-N curves of the steels appear to be quite flat in the tested life range 107 – 109.

Effects of Overload on Fatigue Strength of SUS316 Having a Crack-Like Surface Defect

2010 ◽  
Author(s):  
Hiroko Oosedo ◽  
Koji Takahashi ◽  
Kotoji Ando
Keyword(s):  
Fatigue Strength ◽  
Fatigue Test ◽  
Surface Defect ◽  
Compact Tension ◽  
Crack Size ◽  
Fatigue Tests ◽  
Stress Intensity Factor Range ◽  
Bending Fatigue ◽  
Bending Fatigue Test ◽  
Key Factor

The effects of overload on the fatigue strength and threshold stress intensity factor range (ΔKth) in SUS316 were studied. Tensile overload was applied to compact tension (CT) specimens with a large crack and fatigue tests were carried out to determine the ΔKth. Tensile or compressive overload was applied to bending fatigue test specimens with a small crack-like surface defect and fatigue tests were carried out to determine the fatigue limit and ΔKth. It was found that the ΔKth increased by tensile overloading. The increasing rate of ΔKth in the CT specimen is larger than that in the bending fatigue test specimen. Thus, the crack size effects on the improvement of ΔKth after overloading were observed. The results are discussed from the viewpoint of fracture mechanics. The size of compressive residual stress is the key factor of the increasing rate.

Bending Fatigue Tests Using a Suitable NDT Method to Determine Lifetime of Large Diameter Wire Ropes for Offshore Lifting Applications

2008 ◽  
Author(s):  
Olav Vennemann ◽  
Rikard To¨rnqvist ◽  
Bjo¨rn Ernst ◽  
Sven Winter ◽  
Ian Frazer
Keyword(s):  
Fatigue Test ◽  
Large Diameter ◽  
Fatigue Tests ◽  
Wire Rope ◽  
Test Rig ◽  
Bending Fatigue ◽  
Wire Ropes ◽  
Bending Fatigue Test ◽  
Final Approach ◽  
Technical Effort

Wire rope for installations of subsea components offshore have been used for years in different configurations as single-fall or multi-fall. With greater water depths multi fall solutions become more challenging as even low torque ropes induce some torque and great technical effort has to be made to overcome this problem. An alternative solution is the use of a single-fall system employing a large diameter wire rope. Installations are often carried out with the aid of a heave compensation system to keep the load steady during final approach or to pass through resonance zones. As a result such a large diameter wire rope is subjected to frequent bending. It is well known that cyclic bending over sheave (CBoS) can significantly reduce the lifetime of ropes depending on rope utilisation factors and sheave diameters. While there is a lot of data available for smaller rope sizes, very limited data has been generated with large diameter ropes. It was therefore considered necessary to build a bending fatigue test rig and perform bending fatigue tests with the aim of reducing the uncertainty in the fatigue life of large diameter wire ropes. This paper presents the bending fatigue test rig capable of testing O̸109 mm wire rope to up to 330 t, describes the bending fatigue tests carried out and presents bending fatigue test results. Furthermore, results from non-destructive tests, which were frequently performed during the fatigue tests to obtain further information of rope deterioration over its lifetime, will be presented in this paper.

Bending Strength of Carburized Forged Spur Gear

2007 ◽  
Author(s):  
Masashi Yamanaka ◽  
Shinji Miwa ◽  
Katsumi Inoue ◽  
Yoshiki Kawasaki
Keyword(s):  
Fatigue Strength ◽  
Fatigue Test ◽  
Bending Strength ◽  
Surface Hardness ◽  
Spur Gear ◽  
Bending Fatigue ◽  
Precision Forging ◽  
Bending Fatigue Test ◽  
Bending Fatigue Strength ◽  
Gear Profile

This paper deals with the evaluation of influence of the manufacturing methods precision forging and conventional hobbing on the bending fatigue strength of carburized gears. The forging has advantages in productivity and strength. The forged gear has a continuous directed fiber flow which runs along the gear profile. To clarify the effect of strength enhancement, a bending fatigue test is performed for the forged and the hobbed gears. The material of test gears is SCr420H in the JIS and all gears are carburized. The electrohydraulic servo-controlled fatigue tester is used in the constant stress-amplitude fatigue test. The strength is expressed by the fillet stress level, which is calculated by FEM. The obtained strengths of forged and hobbed gear are 1613 MPa and 1490 MPa, respectively. The strength of forged gear is increased 8% in comparison with that of the hobbed gear. The surface hardness is higher and the surface roughness is smaller in the forged gear, however, the residual stress is approximately same. The effect of improvement of the roughness by forging on the strength is small in 1%, and the main reason of the improvement of fatigue strength is considered as the continuous fiber flow.

Effects of Heating Time, Electric Power and Frequency on Bending Fatigue Strength of Induction Hardened Gears

2006 ◽  
Vol 118 ◽  
pp. 527-532 ◽  
Author(s):  
Kouitsu Miyachika ◽  
Kazuteru Oda ◽  
Hideaki Katanuma ◽  
Jun Iwanaga ◽  
Satoshi Oda
Keyword(s):  
Fatigue Strength ◽  
Electric Power ◽  
Fatigue Test ◽  
Hardened Layer ◽  
Heating Time ◽  
Bending Fatigue ◽  
Bending Fatigue Test ◽  
Optimum Heating ◽  
Bending Fatigue Strength ◽  
Micro Structures

The measurement of hardened layer and the bending fatigue test of S35C and S45C steel gears induction-hardened under various heating conditions were carried out, and then profiles of hardened layer and S-N curves (bending fatigue strength) were obtained. Effects of the heating time, the electric power and the frequency on profiles and micro-structures of hardened layers of gears were examined. Relationship between the bending fatigue strength and the profile of hardened layer was determined. Optimum heating conditions for the bending fatigue strength of induction-hardened S35C and S45C steel gears were indicated.

scholarly journals Experiment and Finite Analysis on Resonant Bending Fatigue of Marine Risers

2015 ◽  
Vol 9 (1) ◽  
pp. 205-212 ◽  
Author(s):  
Fang Xiaoming ◽  
Yan Zhichao ◽  
Wang Liquan ◽  
Huang Yuxuan
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Fatigue Test ◽  
Element Model ◽  
Fatigue Tests ◽  
Experimental Results ◽  
Oil And Gas Development ◽  
Bending Fatigue ◽  
Bending Fatigue Test ◽  
The Finite Element Model

Riser system is a key equipment for offshore oil and gas development. When conducting riser design, fatigue failure mode is the chief one among the many failure modes which should be taken into account. To assess the fatigue performance of riser accurately, it is necessary to conduct fatigue tests. Resonant bending fatigue test is one effective method for fatigue tests of risers. In this paper, the principle of resonant bending fatigue test and test procedures are presented firstly, and then a finite element model using ABAQUS is created to simulate the resonant bending fatigue test, and the results from the finite element model are compared with the experimental results. The good agreements between the FEM results and experimental results verify the accuracy of the finite element model in this paper.

S111023 Development of Compact Bending Fatigue Test Rig for Plastic Gears in Raman Spectroscopic Analysis

2013 ◽  
Vol 2013 (0) ◽  
pp. _S111023-1-_S111023-5
Author(s):  
Yusuke KAWAGOE ◽  
Daisuke IBA ◽  
Morimasa NAKAMURA ◽  
Leonardo PUPPULIN ◽  
Giuseppe PEZZOTTI ◽  
...  
Keyword(s):  
Fatigue Test ◽  
Spectroscopic Analysis ◽  
Test Rig ◽  
Bending Fatigue ◽  
Raman Spectroscopic ◽  
Bending Fatigue Test ◽  
Plastic Gears ◽  
Raman Spectroscopic Analysis

Application of Infrared Imaging Technology in Fatigue Failure Prediction of Vehicle Wheel in Wheel Bending Fatigue Test

2016 ◽  
Author(s):  
W. H. Chai ◽  
X. D. Liu ◽  
Y. C. Shan ◽  
J. G. Wang
Keyword(s):  
Temperature Distribution ◽  
Real Time ◽  
Fatigue Test ◽  
Fatigue Failure ◽  
Infrared Imaging ◽  
Bending Moment ◽  
Fatigue Tests ◽  
Bending Fatigue ◽  
Time Prediction ◽  
Bending Fatigue Test

Bending fatigue test of vehicle wheel is the main test to verify the mechanics performance of spoke. The wheel is fastened to the bending fatigue test platform with bolts in the bending fatigue test. A cyclic bending moment is applied to the wheel, and after some number of cycles, fatigue failure will happen. In this paper, the bending fatigue test is carried out on a steel wheel and a wheel made of long glass fiber reinforced thermoplastic (LGFT) wheel, and infrared imager is used to monitor the temperature distribution and variation of wheels under bending loads in the test process. After the test, it is found that there are cracks at the highest-temperature spots. In addition, because some cracks of LGFT wheel are too tiny to be found, it’s convenient to search those cracks according to the high-temperature areas in infrared images. All above indicate that it is practicable to predict fatigue failure area by monitoring temperature distribution and variation in wheel bending fatigue test. A method for real-time prediction of fatigue failure area in wheel bending fatigue test is described in this paper, which is also helpful to real-time prediction of fatigue failure area in fatigue tests of other products.

Characterization of a resonant bending fatigue test setup for pipes

2011 ◽  
Vol 2 (3) ◽  
pp. 424-431
Author(s):  
Jonas Claeys ◽  
Jeroen Van Wittenberghe ◽  
Patrick De Baets ◽  
Wim De Waele
Keyword(s):  
Fatigue Test ◽  
Analytical Model ◽  
Stress Amplitude ◽  
Fatigue Tests ◽  
Steel Pipe ◽  
Bending Fatigue ◽  
High Frequencies ◽  
Test Setup ◽  
Bending Fatigue Test

This paper discusses the resonant bending fatigue test setup designed at laboratory Soete forfull-scale fatigue tests on pipes. Following an enumeration of other types of fatigue test setups an attempt ismade to characterise the resonant bending machine. The characterisation is obtained by conductingdifferent tests on a steel pipe of grade API X65. Concordance between measured and calculated stressesand influence of excentre position on stress amplitude is discussed. High frequencies and small powerinput make this test setup very effective. The analytical model correctly predicts the measured stresses anda stress versus excentre curve is obtained. However not yet fully defined, it gives a first indication for theexcentre position when preparing for a fatigue test.

Sign in / Sign up

Export Citation Format

Share Document