Research on Fatigue Test of LZ20Mn2 Axle Pipe Steel

2010 ◽  
Vol 44-47 ◽  
pp. 2152-2156
Author(s):  
Hong Lei Dong ◽  
Zhong Guo Huang ◽  
Qing Hua Yuan ◽  
Jia Fan
Keyword(s):  
Crack Initiation ◽  
Fatigue Test ◽  
Pipe Steel ◽  
Test Method ◽  
Fatigue Properties ◽  
Dog Bone ◽  
Slow Decline ◽  
Ultrasonic Fatigue ◽  
Dislocation Crack ◽  
Closure Effect

The core of ultrasonic accelerate fatigue test is resonance, and specimens need resonating with the system. The ultrasonic fatigue test method was used to investigate the high cycle fatigue properties of LZ20Mn2 axle pipe steel. Tests were conducted on cylindrical dog-bone specimens, and all fatigue loadings were controlled by inputting vibration amplitude. The results showed that the S-N curve of LZ20Mn2 axle pipe steel presented a slow-decline shape and subsurface crack initiation. The fatigue fracture was observed by SEM. Two different crack initiation mechanisms were observed which were the mixed inclusions and dislocation. Crack closure effect played an important role at fatigue crack propagation area and the fracture mechanism was a typical plastic fracture.

Proposal of an ultrasonic fatigue test method and evaluation of fatigue properties for L-shaped quasi-isotropic CFRP laminates

2020 ◽  
Vol 2020.28 (0) ◽  
pp. 109
Author(s):  
Kensuke KOSUGI ◽  
Moe SUGANO ◽  
Tsuyoshi MIYAKOSHI ◽  
Atsushi HOSOI ◽  
Yoshinobu TSUDA ◽  
...  
Keyword(s):  
Fatigue Test ◽  
Test Method ◽  
Fatigue Properties ◽  
Cfrp Laminates ◽  
Ultrasonic Fatigue ◽  
Ultrasonic Fatigue Test

Verification of the Fatigue Test Method Applied with the Use of Mini Specimen

2014 ◽  
Vol 598 ◽  
pp. 243-248 ◽  
Author(s):  
Tomasz Tomaszewski ◽  
Janusz Sempruch
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Test ◽  
High Cycle Fatigue ◽  
Fatigue Testing ◽  
Construction Material ◽  
Test Method ◽  
Fatigue Properties ◽  
Cycle Fatigue ◽  
Testing Methodology ◽  
Standard Specimens

In special situations the fatigue properties of the construction material can be determined using non-standard specimens, for example smaller than the normative ones (the so-called mini specimens). The research presented was made for the aluminum alloy based on the high-cycle fatigue testing methodology. The verification was made by breaking down the results with own tests which involved the use of standard specimens and stands as well as with the literature reports.

scholarly journals Proposition of fatigue test method and fatigue properties of concrete under varying compressive repeated load.

1987 ◽  
Vol 36 (406) ◽  
pp. 723-729
Author(s):  
Shinzo NISHIBAYASHI ◽  
Shoichi INOUE ◽  
Kiyoshi YAMURA ◽  
Kenji SAKATA
Keyword(s):  
Fatigue Test ◽  
Test Method ◽  
Fatigue Properties ◽  
Repeated Load

FATIGUE PROPERTIES OF TI-6AL-4V SUBJECTED TO 0.9% PHYSIOLOGICAL SALINE SOLUTION

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2518-2523 ◽  
Author(s):  
XIAOJIAN CAO ◽  
RI-ICHI MURAKAMI ◽  
QINGYUAN WANG
Keyword(s):  
Saline Solution ◽  
Solution Treatment ◽  
Physiological Saline ◽  
Test Method ◽  
Fatigue Properties ◽  
Physiological Saline Solution ◽  
Ultrasonic Fatigue ◽  
Saline Solutions ◽  
Dipping Time ◽  
Commercial Titanium Alloy

Fatigue properties of Ti -6 Al -4 V (TC4) subjected to 0.9% physiological saline solutions were presented in this paper. The ultrasonic fatigue test method has been used to investigate the very high cycle fatigue properties of commercial titanium alloy TC4 with the microstructure of tramsformed lamellar dipped into 0.9% physiological saline solution prior to testing. Three estimated times have been decided for subjecting at 37 °C, such as 24 hours, 2 weeks and 4 weeks. The results show that physiological saline solution treatment makes a little influence on the ultrasonic fatigue life of TC4. The slope of S-N curve decreases as the dipping time increases. Dipping tests for three estimated times also have been performed. When TC4 has been dipped into physiological saline solution for 4 weeks, homogeneous white points have been observed on specular facet specimen. And in the fracture surface of which has been dipped for 4 weeks, new inclusion sized 5-10 µm in the crack initiation has been observed. The fractography pictures show the fracture to be transcrystalline plastic. Cracks are initiated because of the subsurface inclusion and the facet slip of α-phase.

Fatigue Crack Initiation Mechanism of Aluminium Alloy Welded Joint in Gigacycle Fatigue

2013 ◽  
Vol 376 ◽  
pp. 177-180
Author(s):  
Chao He ◽  
Shi Ming Cui ◽  
Yan Zeng Wu ◽  
Ze Fu Luo ◽  
Qing Yuan Wang
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Aluminium Alloy ◽  
Fusion Zone ◽  
Base Metal ◽  
Welded Joint ◽  
Fatigue Crack Initiation ◽  
Fatigue Properties ◽  
Initiation Mechanism ◽  
Ultrasonic Fatigue

Ultrasonic fatigue test was performed on 5052 aluminium alloy welded joint to investigate the very high cycle fatigue properties and the fatigue crack initiation mechanisms with the help of microhardness tester and scanning electron microscope (SEM). The results showed that the hardness of fusion zone was higher that base metal and heat affected zone, which led to the embrittlement of welded zone. Fusion zone became the weakest part of welded joint under cyclical loading. Fatigue crack usually initiated from the pores beneath the surface from the SEM observation of fracture surface. The influence of pores on the fatigue crack initiation was analyzed to figure out the deterioration of fatigue strength for welded joint as compared with base metal.

Corrosion Fatigue Tests of Micro-Sized Specimens

2000 ◽  
Vol 657 ◽  
Author(s):  
Y. Mizutani ◽  
Y. Higo ◽  
Y. Ichikawa ◽  
A. Morita ◽  
K. Takashima ◽  
...  
Keyword(s):  
Fatigue Test ◽  
Corrosion Fatigue ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Fatigue Tests ◽  
Test Method ◽  
Fatigue Properties ◽  
Mems Devices ◽  
Problems And Solutions ◽  
Beam Type

ABSTRACTCorrosion fatigue properties of micro-sized materials are extremely important to design MEMS devices and micro-machines used in corrosive environments. However, there have been few studies that investigate corrosion fatigue properties of micro-sized materials. Thus, it is necessary to develop a corrosion fatigue test method for micro-sized materials. However, there are several difficulties in corrosion fatigue tests on micro-sized specimens. It is also necessary to clarify the problems for the method and to find their solutions. In this investigation, a corrosion fatigue test method for micro-sized specimens has been developed and corrosion fatigue tests for micro-sized Ni-P amorphous alloy specimens have been carried out in a 0.9% NaCl solution. Specimens of cantilever-beam-type with dimensions of 10 × 12 × 50 μm3 were prepared from a Ni-P amorphous thin film by focused ion beam machining. Corrosion fatigue tests on the micro-sized specimens were succeeded, and environmental effects on fatigue properties of micro-sized specimens were clearly observed. Several problems and solutions for the method were described.

On the Research and Application of Ultrasonic Fatigue Testing Technology

2015 ◽  
Vol 664 ◽  
pp. 62-67
Author(s):  
Wen Jie Peng ◽  
Yue Wang ◽  
Huan Xue ◽  
Jia He
Keyword(s):  
Size Effect ◽  
Fatigue Test ◽  
High Cycle Fatigue ◽  
Fatigue Testing ◽  
Smelting Process ◽  
Fatigue Properties ◽  
Frequency Effect ◽  
Cycle Fatigue ◽  
Testing Technology ◽  
Ultrasonic Fatigue

In the present paper, the characteristic and the application of ultrasonic fatigue testing technology is illuminated. The main problems i.e. the size effect, the thermal effect and frequency effect due to the high frequency are discussed. The results show that: 1. As there is a size effect, a uniform specimen size should be adopted in the very-high cycle fatigue standard and for special designed specimen the designed size should be noted along with the fatigue test results; 2.the heat generation attributes mainly to the low yield strength and the high applied stress, as a result, ultrasonic fatigue testing technology can be mainly applied to the ultra-high cycle fatigue test of high-strength steel; 3.the frequency effect is related to the crystal structure of metallic materials, however, ultrasonic fatigue testing technology can be applied to conduct the comparison of the fatigue properties of the same steel grade before and after the smelting process.

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