Development of Crack Arrest Temperature Test Method by Using a Local Temperature Gradient

2019 ◽  
Vol 48 (6) ◽  
pp. 20180341 ◽  
Author(s):  
Gyubaek An ◽  
Hong-Yeol Bae ◽  
Jeong-Ung Park
Keyword(s):  
Temperature Gradient ◽  
Crack Arrest ◽  
Test Method ◽  
Local Temperature ◽  
Temperature Test ◽  
Arrest Temperature

Effects of residual stress by EB welds on assessment of crack arrest temperature (CAT)

2020 ◽  
Vol 64 (7) ◽  
pp. 1161-1174
Author(s):  
Chiyomi Iwatake ◽  
Masahito Kaneko ◽  
Kazuyuki Matsumoto ◽  
Tsutomu Fukui ◽  
Shuji Aihara ◽  
...  
Keyword(s):  
Residual Stress ◽  
Crack Arrest ◽  
Arrest Temperature

scholarly journals Experimental Study of the Temperature Distribution in CRTS-II Ballastless Tracks on a High-Speed Railway Bridge

2020 ◽  
Vol 10 (6) ◽  
pp. 1980 ◽  
Author(s):  
Lei Zhao ◽  
Ling-Yu Zhou ◽  
Guang-Chao Zhang ◽  
Tian-Yu Wei ◽  
Akim D. Mahunon ◽  
...  
Keyword(s):  
High Temperature ◽  
Temperature Distribution ◽  
Temperature Gradient ◽  
High Speed ◽  
Railway Track ◽  
Vertical Temperature ◽  
High Speed Railway ◽  
Extreme High Temperature ◽  
Transverse Temperature ◽  
Temperature Test

To study the temperature distribution in the China Railway Track System Type II ballastless slab track on a high-speed railway (HSR) bridge, a 1:4 scaled specimen of a simply-supported concrete box girder bridge with a ballastless track was constructed in laboratory. Through a rapid, extreme high temperature test in winter and a conventional high temperature test in summer, the temperature distribution laws in the track on the HSR bridge were studied, and the vertical and transverse temperature distribution trend was suggested for the track. Firstly, the extreme high temperature test results showed that the vertical temperature and the vertical temperature difference distribution in the track on HSR bridge were all nonlinear with three stages. Secondly, the extreme high temperature test showed that the transverse temperature distribution in the track was of quadratic parabolic nonlinear form, and the transverse temperature gradient in the bottom base was significantly higher than that of the other layers of the track. Thirdly, the three-dimensional temperature distribution in the track on HSR bridge was a nonlinear, three-stage surface. Furthermore, similar regularities were also obtained in the conventional high temperature test, in which the temperature span ranges were different from those of the extreme high temperature test. In addition, the conventional high temperature test also showed that under the natural environment conditions, the internal temperature gradient in the track layers changed periodically (over a period of 24 h).

scholarly journals Mitotic Spindle in HeLa Cell Rotates According to the Local Temperature Gradient

2012 ◽  
Vol 102 (3) ◽  
pp. 219a
Author(s):  
Madoka Suzuki ◽  
Masahiro Motoyoshi ◽  
Kotaro Oyama ◽  
Takeshi Itabashi ◽  
Shin'ichi Ishiwata
Keyword(s):  
Temperature Gradient ◽  
Hela Cell ◽  
Mitotic Spindle ◽  
Local Temperature

scholarly journals Development of simple test method to evaluate crack arrest property.

1985 ◽  
Vol 25 (12) ◽  
pp. 1267-1275 ◽  
Author(s):  
Toshiya AKIYAMA ◽  
Yoshihiro HIRASE ◽  
Namio URABE
Keyword(s):  
Crack Arrest ◽  
Test Method ◽  
Simple Test

Crack Arrest Test Results of Unirradiated and Irradiated German RPV Steels

2013 ◽  
Author(s):  
Florian Obermeier ◽  
Julia Barthelmes ◽  
Elisabeth Keim ◽  
Hieronymus Hein ◽  
Hilmar Schnabel ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Lower Bound ◽  
Pressure Vessel ◽  
Charpy Impact ◽  
Crack Arrest ◽  
Reactor Pressure Vessel ◽  
Test Method ◽  
Fracture Toughness Test ◽  
Test Results ◽  
Reactor Pressure

In the CARISMA[1] and CARINA[2] projects comprehensive tensile, Charpy-impact and fracture toughness tests were performed for unirradiated and irradiated original reactor pressure vessel (RPV) steel specimens from German pressurized water reactors (PWR) up to neutron fluences in the range of 60 operational years and beyond. In addition, crack arrest fracture toughness tests were performed to demonstrate the crack arrest behavior of the materials. To determine the crack arrest properties of ferritic steels, the designated test method according to ASTM E1221 [3] was used. However, in particular for irradiated reactor pressure vessel materials with higher irradiation embrittlement, the prescribed standard test specimen does not always provide adequate test results. During starter notch preparation annealing effects occurred in the heat affected zone (HAZ) of the brittle weld of the starter notch causing crack arrest in the HAZ after unstable crack initiation. Therefore a modified test method to perform crack arrest tests with so called duplex specimens was investigated. In this paper this modified method and the test results of five base and four weld metals with a fluence up to 4,69E+19 cm−2 (E >1 MeV) are discussed. The available test results show that the duplex specimen is an appropriate alternative to the standard compact crack arrest (CCA) specimen. The measured KIa fracture toughness data are enveloped by the “lower bound” of the ASME KIa-curve indexed with RTNDTj or TKIa but not all data are enveloped by indexing the “lower bound” curve with RTT0 like described in the ASME Code Case N-629 [4]. Furthermore correlations of the crack arrest test results with Charpy-impact and fracture toughness test results will be shown.

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