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

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.

Technical Review of Specimens under Ultrasonic Fatigue Test

2013 ◽  
Vol 37 (8) ◽  
pp. 967-973 ◽  
Author(s):  
No-Jun Myeong ◽  
Seung-Wook Han ◽  
Jung-Hoon Park ◽  
Nak-Sam Choi
Keyword(s):  
Fatigue Test ◽  
Technical Review ◽  
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.

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