Crack Initiation, Propagation, and Arrest in 316L Model Pipe Components under Thermal Fatigue

2008 ◽  
pp. 539-539-18
Author(s):  
E Paffumi ◽  
KF Nilsson ◽  
N Taylor ◽  
R Hurst ◽  
M Bache
Keyword(s):  
Crack Initiation ◽  
Thermal Fatigue

Thermal Fatigue Testing and Analysis of a Thick Perforated Ring

2007 ◽  
Author(s):  
T. M. Damiani ◽  
J. E. Holliday ◽  
M. J. Zechmeister ◽  
R. D. Reinheimer ◽  
D. P. Jones
Keyword(s):  
Crack Initiation ◽  
Thermal Fatigue ◽  
Fatigue Testing ◽  
Fatigue Crack Initiation ◽  
Three Dimensional ◽  
Fatigue Cracking ◽  
Forced Flow ◽  
Test Loop ◽  
Rapid Changes ◽  
Oxygenated Water

Thermal fatigue cracking has been observed for thick perforated spacer rings used as part of a thermal fatigue test loop operating at Bechtel Bettis, Inc. The perforated rings are used for instrumentation access to the fluid flow at the test specimen inlet and outlet, and are subject to alternating hot and cold forced flow, low oxygenated water every three minutes so that rapid changes in water temperature impart a thermal shock event to the inner wall of the rings. Thermal and structural three dimensional elastic and elastic-plastic finite element analyses (FEA) were conducted for the ring and the results used to predict fatigue crack initiation using strain-based fatigue-life algorithms. Predicted cycles-to-crack initiation agreed well with the observed cracking when alternating shear strain intensity analogous to the Tresca stress was used. This analysis qualifies the use of FEA for thermal fatigue assessments of complicated three-dimensional components.

Crack Initiation, Propagation, and Arrest in 316L Model Pipe Components under Thermal Fatigue

2005 ◽  
Vol 2 (5) ◽  
pp. 12035 ◽  
Author(s):  
E Paffumi ◽  
K-F Nilsson ◽  
N Taylor ◽  
R Hurst ◽  
M Bache
Keyword(s):  
Crack Initiation ◽  
Thermal Fatigue

The Thermal Fatigue Performance for Cast Iron Brake Drum of Large Trucks

2011 ◽  
Vol 117-119 ◽  
pp. 821-823
Author(s):  
Gao Lu ◽  
Wen Yan Wang ◽  
Jing Pei Xie
Keyword(s):  
Cast Iron ◽  
Stress Concentration ◽  
Crack Initiation ◽  
Thermal Fatigue ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Fatigue Crack Initiation ◽  
High Strength ◽  
Fatigue Properties ◽  
Brake Drum

This paper studies the application in different cast iron brake drum the thermal fatigue properties of materials. The results show that the stress concentration factor of grey cast iron, hot fatigue crack initiation, low intensity, and easy to expand, organization crack initiation poor stability, antioxidant ability is poor, thermal fatigue is poorer. 35% of vermicular cast iron and of ductile iron high strength, toughness, good stress concentration factor small, thermal fatigue is well.

Effect of Heat Treatment on Microstructure and Thermal Fatigue Properties of Al-Si-Cu-Mg Alloys

2018 ◽  
Vol 37 (4) ◽  
pp. 289-298
Author(s):  
Wei Chao ◽  
Liu Guang-lei ◽  
Wan Hao ◽  
Li Yu-shan ◽  
Si Nai-chao
Keyword(s):  
Heat Treatment ◽  
Fatigue Crack ◽  
Crack Initiation ◽  
Grain Boundary ◽  
Crack Propagation ◽  
Thermal Fatigue ◽  
Fatigue Crack Initiation ◽  
Fatigue Properties ◽  
Eutectic Si ◽  
Al Matrix

AbstractThe effect of heat treatment on the microstructure and thermal fatigue properties were studied by means of optical microscope (OM) and scanning electron microscope (SEM). Energy dispersive X-ray detector (EDX) was used to analyze the role of phase composition in fatigue crack propagation. The results show that after heat treatment, the ultimate tensile strength increased from 285 MPa to 368 MPa and the elongation increased from 5.8 % to 6.5 %. During the initiation of fatigue crack, the crack was mainly propagated through eutectic Si area. With the long needles of eutectic Si particles spherodized after heat treatment, the split action from brittle Si particles to α-Al matrix was reduced and prolonged the fatigue crack initiation period. After aging for 6 h, the dispersed precipitation of secondary phases (Al2Cu, Mg2Si) elevated the driving force of crack propagation, blocked the spread of crack in the grain boundary, decreased the rate of fatigue crack growth and improved the fatigue resistance of alloy at the same time. In the process of crack initiation, the surplus-phase around the grain boundary fell off from α-Al matrix under thermal cycling stresses. The combination of interfaces was weaken by cycling stress and the fatigue crack was finally grown up in the weakness area between matrix and secondary phase.

Thermal Fatigue Crack Initiation and Related Microstructural Evolution in Sn/3.0Ag/0.5Cu Solder Joints

2002 ◽  
Vol 2002.6 (0) ◽  
pp. 279-280
Author(s):  
Toshihiko SAYAMA ◽  
Takao MORI ◽  
Satoko YAMAZAKI ◽  
Yoshiaki NAGAI ◽  
Takeshi TAKAYANAGI ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Microstructural Evolution ◽  
Thermal Fatigue ◽  
Solder Joints ◽  
Fatigue Crack Initiation ◽  
Thermal Fatigue Crack

Thermal fatigue crack initiation and related microstructural evolution in Sn/3.5Ag eutectic solder joints

2002 ◽  
Vol 2002.6 (0) ◽  
pp. 277-278
Author(s):  
Toshihiko SAYAMA ◽  
Takao MORI ◽  
Takahiro OHNISHI ◽  
Yoshiaki NAGAI ◽  
Takeshi TAKAYANAGI ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Crack Initiation ◽  
Microstructural Evolution ◽  
Thermal Fatigue ◽  
Solder Joints ◽  
Fatigue Crack Initiation ◽  
Eutectic Solder ◽  
Thermal Fatigue Crack
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