scholarly journals Alpha Chromium Formation in Alloy 718 and its Effect on Creep Crack Propagation

2001 ◽  
Author(s):  
X. Xie ◽  
G. Wang ◽  
J. Dong ◽  
C. Wu ◽  
J. Radavich ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Alloy 718 ◽  
Creep Crack

Application of J-Integral to High-Temperature Crack Propagation: Part II—Fatigue Crack Propagation

1979 ◽  
Vol 101 (2) ◽  
pp. 162-167 ◽  
Author(s):  
Shuji Taira ◽  
Ryuichi Ohtani ◽  
Tomio Komatsu
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Large Scale ◽  
Crack Propagation Rate ◽  
Propagation Rate ◽  
Integral Approach ◽  
Fatigue Crack Propagation Rate ◽  
J Integral ◽  
Creep Crack

On the basis of the successful results of our previous study on a J-integral approach to the creep crack propagation of steels, the applicability of the creep J-integral to the time dependent fatigue crack propagation in creep range was studied. A satisfactory correlation was obtained between crack propagation rate and creep J-integral, and the same correlation was found in creep crack propagation under constant load as well as two-step loading. It was also found that the cycle dependent fatigue crack propagation rate could be successfully correlated by the cyclic J-integral. The high crack propagation rate in large scale yielding fatigue may be in agreement with the straight line extrapolation on log-log plots of the linear elastic fatigue crack propagation rate versus cyclic J-integral data.

Fracture Mechanics and Fractography of Creep and Fatigue Crack Propagation at Elevated Temperature

1976 ◽  
Vol 98 (4) ◽  
pp. 296-304 ◽  
Author(s):  
R. Koterazawa ◽  
Y. Iwata
Keyword(s):  
Fatigue Crack ◽  
Fracture Mechanics ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Compact Tension ◽  
304 Stainless Steel ◽  
Bending Stress ◽  
Type Specimens ◽  
Creep Crack ◽  
Repeated Stress

A fracture mechanics and fractographic study was conducted on creep and fatigue crack propagation of a 304 stainless steel under constant and repeated tensile stress at a temperature of 650°C. Linear elastic fracture mechanics could be applied to the test data fairly successfully in spite of the fact that the tests were conducted under creep conditions. A comparison with data in a literature indicated that this is not true for bending-type specimens such as the compact tension specimen because of redistribution of bending stress due to creep, and therefore a specimen geometry which avoids bending stress is preferred for creep crack testing. Under repeated stress, the crack generally started as a transgranular fatigue crack and changed to an intergranular creep crack at some length of the crack. The transition point moved to a later stage of crack propagation as the period of repeated stress increased. This transition phenomenon could be explained by assuming that the two crack propagation processes, the transgranular fatigue crack and the intergranular creep crack, are possible under repeated stress condition and that the one with the higher rate actually occurs.

Kinetics of fatigue and creep crack propagation in PVC pipe

2002 ◽  
Vol 8 (4) ◽  
pp. 251-258 ◽  
Author(s):  
Y. Hu ◽  
J. Summers ◽  
A. Hiltner ◽  
E. Baer
Keyword(s):  
Crack Propagation ◽  
Creep Crack ◽  
Pvc Pipe ◽  
Kinetics Of

In situ FESEM observation/EBSD analysis of creep crack propagation in submicron gold films

2019 ◽  
Vol 2019.94 (0) ◽  
pp. 201
Author(s):  
Hiroyuki INOUE ◽  
Toshiyuki KONDO ◽  
Hiroyuki HIRAKATA ◽  
Kohji MINOSHIMA
Keyword(s):  
Crack Propagation ◽  
Ebsd Analysis ◽  
Gold Films ◽  
Creep Crack

Creep crack propagation in gold submicron films at room temperature

2016 ◽  
Vol 201 (2) ◽  
pp. 127-141 ◽  
Author(s):  
Hiroyuki Hirakata ◽  
Takumi Kameyama ◽  
Ryota Kotoge ◽  
Toshiyuki Kondo ◽  
Masayuki Sakihara ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Room Temperature ◽  
Creep Crack

Numerical Simulation of Creep Crack Propagation for Austenitic Stainless Steel 0Cr18Ni9 at 550°C

2011 ◽  
Vol 230-232 ◽  
pp. 596-599
Author(s):  
Li Jie Chen ◽  
Zun Qun Gong ◽  
Qi Zhao
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Crack Propagation ◽  
Crack Growth ◽  
Elevated Temperatures ◽  
Creep Crack Growth ◽  
Tensile Creep ◽  
Computational Error ◽  
Propagation Length ◽  
Creep Crack

First, tensile creep curve and creep propagation tests are conducted for austenitic stainless steel 0Cr18Ni9, i.e. 304 stainless steel at 550°C. The corresponding time hardening creep law is given for stresses ranging from 240 to 320 Mpa and the creep crack propagation length under a tension load of 10kN is measured by using QUESTAR long focus microscope system. Second, with the commercial finite element (FE) code ANSYS, the critical crack tip opening displacement (CTOD) is considered as crack propagation criterion to simulate the creep crack growth in the standard compact tension (CT) specimen. The FE predictions of the creep crack length in the primary and secondary stages are found to agree reasonably with the experimental results. The maximum computational error between the predictions and the experiment results is within 10%. Hence, the critical CTOD is a feasible criterion for crack growth simulations at elevated temperatures.

Sign in / Sign up

Export Citation Format

Share Document