scholarly journals Effect of Oxidation on the Fatigue Crack Propagation Behavior of Z3CN20.09M Duplex Stainless Steel in High Temperature Water

2017 ◽  
Vol 49 (4) ◽  
pp. 744-751 ◽  
Author(s):  
Huan Chun Wu ◽  
Bin Yang ◽  
Yue Feng Chen ◽  
Xu Dong Chen
Keyword(s):  
Stainless Steel ◽  
Fatigue Crack ◽  
High Temperature ◽  
Crack Propagation ◽  
Duplex Stainless Steel ◽  
Fatigue Crack Propagation Behavior ◽  
Propagation Behavior ◽  
High Temperature Water ◽  
Crack Propagation Behavior ◽  
Temperature Water

Fatigue Crack Propagation Tests on 304 Stainless Steel in High Temperature Water: Accelerated Cracking Rates and Transition to Lower Rates

2004 ◽  
Author(s):  
G. L. Wire ◽  
W. M. Evans ◽  
W. J. Mills
Keyword(s):  
Stainless Steel ◽  
Fatigue Crack ◽  
High Temperature ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Hold Time ◽  
304 Stainless Steel ◽  
High Temperature Water ◽  
Stress Ratios ◽  
Temperature Water

Previous fatigue crack propagation (FCP) tests on a single heat of 304 stainless steel (304 SS) specimens showed a strong acceleration of rates in high temperature water with 40–60 cc H2/kg H2O at 288°C, with rates up to 20X the air rates. The accelerated rates were observed under fully reversed conditions (R = −1) (Wire and Mills, 2001) and high stress ratios (R = 0.7 and 0.83) (Evans and Wire, 2001). In this study, a second heat of 304 SS has been tested at 243°C and 288°C and lower positive stress ratios (R = 0.3, 0.5). The second heat showed the large acceleration of rates at 288°C observed previously. Rates were up to two times lower at 243°C, but were still 7–8X the air rates. A time-based correlation successfully correlates the accelerated rates observed, and is nearly identical to fits of literature data in hydrogen water chemistry (HWC), which has hydrogen added at a lower level of about 1 cc/kg H2O. The accelerated rates on the second heat were not stable under two different test conditions. In contrast to the first heat, the second heat showed a reduction in environmental enhancement at long rise times, accompanied by a change in fracture mode. Addition of a constant load hold time of 1200 s between cycles also caused a marked reduction in crack propagation rates in both heats, with reduction to nearly air rates in the second heat. The differing rise time effects between the two heats could be rationalized by time-dependent deformation. More hold time testing is required to define the material and loading conditions which lead to reduced rates.

Fatigue Crack Propagation of 304 Stainless Steel in High Temperature Water: Additional Tests and Data Correlation

2005 ◽  
Author(s):  
G. L. Wire ◽  
W. M. Evans ◽  
W. J. Mills
Keyword(s):  
Stainless Steel ◽  
Fatigue Crack ◽  
High Temperature ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
Stress Ratio ◽  
Hold Time ◽  
304 Stainless Steel ◽  
High Temperature Water ◽  
Temperature Water

Fatigue crack propagation (FCP) testing of 304 stainless steel (304 SS) specimens showed a strong acceleration of rates in high temperature water with 40–60 cc H2/kg H2O at 243°C and 288°C, with rates up to 20X the air rates [1]. However, FCP rates were markedly reduced for a second heat at long rise times and for both heats with addition of a constant load hold time of 1200 s at a high stress ratio [2]. Such behavior had not been previously reported in the literature and merited further investigation. Tests have been extended to include two additional heats and a wider set of loading conditions. FCP rates were accelerated at long rise times in the two additional heats, consistent with a large series of tests on wrought, weld, and cast austenitic stainless steel materials recently reported by Nomura, et al. [3]. Hold time tests at a lower stress ratio showed that small increases or decreases in rate occur with holds at minimum or maximum load, but the changes were within normal data scatter. The rate reductions are not a generic result of less frequent cycling, but are limited to specific loading parameters or heats. A time-based correlation successfully describes the accelerated rates observed on all four heats, and is nearly identical to fits of literature data in PWR water and hydrogen water chemistry (HWC). A power law fit with separate terms for rise time, ΔK, and stress ratio provides an equivalent correlation.

scholarly journals Fatigue Crack Propagation Behavior of RC Beams Strengthened with CFRP under High Temperature and High Humidity Environment

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Dongyang Li ◽  
Peiyan Huang ◽  
Guang Qin ◽  
Xiaohong Zheng ◽  
Xinyan Guo
Keyword(s):  
Fatigue Crack ◽  
High Temperature ◽  
Carbon Fiber ◽  
Crack Propagation ◽  
Fatigue Crack Propagation ◽  
High Humidity ◽  
Rc Beams ◽  
Fatigue Crack Propagation Behavior ◽  
Propagation Behavior ◽  
Crack Propagation Behavior

Numerical and experimental methods were applied to investigate fatigue crack propagation behavior of reinforced concrete (RC) beams strengthened with a new type carbon fiber reinforced polymer (CFRP) named as carbon fiber laminate (CFL) subjected to hot-wet environment. J-integral of a central crack in the strengthened beam under three-point bending load was calculated by ABAQUS. In finite element model, simulation of CFL-concrete interface was based on the bilinear cohesive zone model under hot-wet environment and indoor atmosphere. And, then, fatigue crack propagation tests were carried out under high temperature and high humidity (50°C, 95% R · H) environment pretreatment and indoor atmosphere (23°C, 78% R · H) to obtain a-N curves and crack propagation rate, da/dN, of the strengthened beams. Paris-Erdogan formula was developed based on the numerical analysis and environmental fatigue tests.

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