The use of acoustic emission for determination of fracture toughness at cryogenic temperatures

1990 ◽  
Vol 22 (11) ◽  
pp. 1582-1586
Author(s):  
V. G. Smirnov ◽  
Yu. F. Solntsev
Keyword(s):  
Fracture Toughness ◽  
Acoustic Emission ◽  
Cryogenic Temperatures

Use of the acoustic emission method for determination of the fracture toughness of ductile steels

1989 ◽  
Vol 21 (1) ◽  
pp. 33-38
Author(s):  
V. L. Volodin ◽  
Yu. D. Kon'kov ◽  
Yu. A. Alyushin
Keyword(s):  
Fracture Toughness ◽  
Acoustic Emission ◽  
Acoustic Emission Method ◽  
Emission Method

Fracture toughness determination of concrete by use of breakoff tester and acoustic emission technique

1990 ◽  
Vol 20 (5) ◽  
pp. 687-701 ◽  
Author(s):  
T. Hashida ◽  
H. Takahashi ◽  
S. Kobayashi ◽  
Y. Fukugawa
Keyword(s):  
Fracture Toughness ◽  
Acoustic Emission ◽  
Acoustic Emission Technique

Acoustic Emission Entropy for Evaluation of Fracture Toughness of HSLA Steel Welded Joint

2017 ◽  
Author(s):  
Mengyu Chai ◽  
Weijie Wu ◽  
Zaoxiao Zhang ◽  
Guangxu Cheng ◽  
Quan Duan
Keyword(s):  
Fracture Toughness ◽  
Acoustic Emission ◽  
Welded Joint ◽  
Hsla Steel ◽  
Amplitude Distribution ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
New Approach ◽  
Astm Standard

In this investigation, fracture toughness behavior of high strength low alloy (HSLA) steel welded joint was studied using acoustic emission (AE) monitoring. For the design of new structures and for the safety and reliability analyses of operating components, fracture toughness (KIC) values of materials play an essential role. Acoustic emission technique (AET) has been used for determination of fracture toughness based on some observable changes of AE evolutions. However, the occurrence of appreciable plasticity in materials, the friction between the crack surfaces and mechanical noise could generate high emission and may result in some difficulties in precise determination of fracture toughness. Thus, the objective of this study is to propose a new approach to evaluate fracture toughness values and to characterize the fracture process based on AE entropy. Specimens were selected from 2.25Cr-1Mo-0.25V steel welded joint which were thermally aged at 978 K for 8 h. The AE signals generated during fracture processes were recorded and the corresponding AE entropy was calculated based on the probability amplitude distribution from each original AE waveform. The point of crack initiation was identified by the occurrence of sudden rise of AE entropy and the corresponding critical load was used to estimate fracture toughness value. The estimated values obtained from the proposed new approach were compared with those determined by the methodology proposed by compact tension specimen testing according to ASTM standard E399. The results showed that the estimated values were in close agreement with those gained from ASTM standard. It was concluded that AE entropy was an effective parameter to estimate fracture characteristics and fracture toughness values.

USS 18-8S and 18-8L

Alloy Digest ◽  
1975 ◽  
Vol 24 (2) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Strength ◽  
Heat Treating ◽  
Cryogenic Temperatures ◽  
United States Steel Corporation ◽  
Temperature Performance ◽  
Aisi Type ◽  
Shock Resistance ◽  
Type 304 ◽  
Excellent Stability

Abstract USS 18-8S (AISI Type 304) and USS 18-8I (AISI Type 304L) are austenitic chromium-nickel steels that are easy to fabricate and weld. They combine high strength with excellent stability and shock resistance, even at cryogenic temperatures. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on low temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-305. Producer or source: United States Steel Corporation.

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