scholarly journals Crack Growth and Acoustic Emission Behavior during Corrosion Fatigue Process of a High Strength Ti-6 Al-4V Alloy

1984 ◽  
Vol 33 (4) ◽  
pp. 207-215
Author(s):  
Shigenori Yuyama ◽  
Teruo Kishi ◽  
Yoshihiro Hisamatsu ◽  
Tsuneo Kakimi
Keyword(s):  
Acoustic Emission ◽  
Crack Growth ◽  
Corrosion Fatigue ◽  
High Strength ◽  
Fatigue Process ◽  
Emission Behavior ◽  
Acoustic Emission Behavior

Acoustic Emission Behavior during Fatigue Crack Propagation in 304 Stainless Steel

2004 ◽  
Vol 261-263 ◽  
pp. 1325-1330 ◽  
Author(s):  
Kwang Hwan Oh ◽  
C.K. Jung ◽  
Y.C. Yang ◽  
Kyung Seop Han
Keyword(s):  
Stress Intensity Factor ◽  
Stainless Steel ◽  
Acoustic Emission ◽  
Fatigue Crack ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Crack Growth ◽  
304 Stainless Steel ◽  
Emission Behavior ◽  
Acoustic Emission Behavior

This study investigated acoustic emission behavior during fatigue crack growth test under constant and variable amplitude loading in 304 stainless steel. To describe the acoustic emission behavior, counts rate(dη/dn) was related with stress intensity factor range (SIFR, ΔK) in log-log plot. As a result of test, the relationship was represented a curve, which forms rise and fall behavior in counts rate as the SIFR increases. AE response to a single overload was sudden drop and slow recovery in counts rate, which was similar to crack growth retardation behavior. Under block loading, counts rate of each loading block was same as that of constant amplitude loading. Overall experimental results indicated that stress intensity factor controls the counts rate (dη/dn) as well as crack growth rate (da/dn) regardless of load range or crack length.

Acoustic Emission Behavior of Granular Soils

1976 ◽  
Vol 102 (7) ◽  
pp. 761-773
Author(s):  
Robert M. Koerner ◽  
John W. Curran ◽  
W. Martin McCabe ◽  
Arthur E. Lord
Keyword(s):  
Acoustic Emission ◽  
Granular Soils ◽  
Emission Behavior ◽  
Acoustic Emission Behavior

Corrosion-Fatigue Crack Growth Performance of Titanium Grade 29 Welds in Tapered Stress Joints

2021 ◽  
Vol 143 (6) ◽  
Author(s):  
Gabriel Rombado ◽  
David A. Baker ◽  
Lars M. Haldorsen ◽  
Pedro da Silva Craidy ◽  
Jim H. Feiger ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Corrosion Fatigue ◽  
High Strength ◽  
Potential Effect ◽  
Steel Catenary Riser ◽  
Corrosion Fatigue Crack ◽  
Corrosion Fatigue Crack Growth ◽  
Titanium Grade

Abstract Design of a steel catenary riser requires the use of connection hardware to decouple the large bending moments induced by the host floater at the hang-off location. Reliability of this connection hardware is essential, particularly in applications involving high pressure and high temperature fluids. One option for this connection hardware is the metallic tapered stress joint. Titanium (Ti) Grade 29 has been identified as an attractive material candidate for demanding stress joint applications due to its “high strength, low weight, superior fatigue performance and innate corrosion resistance”.2 Titanium stress joints for deepwater applications are typically not fabricated as a single piece due to titanium ingot volume limitations, thus making an intermediate girth weld necessary to satisfy length requirements. As with steel, the potential effect of hydrogen embrittlement induced by cathodic and galvanic potentials must be assessed to ensure long-term weld integrity. This paper describes testing from a joint industry project (JIP) conducted to qualify titanium stress joint (TSJ) welds for ultra-deepwater applications under harsh service and environmental conditions. Corrosion-fatigue crack growth rate (CFCGR) results for Ti Grade 29 flat welding-groove weld (1G/PA) gas tungsten arc welding (GTAW) specimens in seawater under cathodic potential and sour brine under galvanic potential are presented and compared to vendor recommended design curves.

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