OS0621 Specimen size effect to the relationship between fracture toughness and critical stretched zone width in cold-worked SUS304

2008 ◽  
Vol 2008 (0) ◽  
pp. _OS0621-1_-_OS0621-2_
Author(s):  
Tadahiko Torimaru ◽  
Masanari Sugiyama ◽  
Hiroshi Sakamoto ◽  
Shigeaki Tanaka ◽  
Tomomi Nakamura
Keyword(s):  
Fracture Toughness ◽  
Size Effect ◽  
Specimen Size ◽  
Zone Width ◽  
Cold Worked ◽  
The Relationship

The Effect of Specimen Size for the P91 Steel at Elevated and High Temperatures

2017 ◽  
Author(s):  
Ludek Stratil ◽  
Filip Siska ◽  
Hynek Hadraba ◽  
Stanislava Fintova ◽  
Tomas Mrna ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Size Effect ◽  
Temperature Dependence ◽  
Pressure Vessels ◽  
Specimen Size ◽  
Dynamic Strain ◽  
Dynamic Strain Ageing ◽  
P91 Steel ◽  
Piping Systems ◽  
Curve Determination

The contribution aims to evaluate fracture toughness of the P91 steel in the ductile regime. This steel is broadly used for applications for pressure vessels and piping systems. The J–R curves were obtained using 1T, 0.5T and 0.25T CT specimens at 23 °C and using 0.5T and 0.25T CT specimens up to 600 °C. The energy normalization method for the J–R curve determination according to the ASTM E1820 was used. The resistance to crack propagation shows temperature dependence and the dynamic strain ageing effect with minimum values at 400 °C. Both specimen sizes 0.5T and 0.25T give a similar trend of the temperature dependence of fracture toughness. However, the size effect is observed as fracture toughness decreases with the specimen size. The results obtained are compared with the results of other authors pointing the specimen size effect and the temperature dependence of the steel.

SPECIMEN SIZE EFFECT ON J-INTEGRAL FRACTURE TOUGHNESS

1978 ◽  
pp. 267-272 ◽  
Author(s):  
D. Sunamoto ◽  
M. Satoh ◽  
T. Funada ◽  
M. Tomimatsu
Keyword(s):  
Fracture Toughness ◽  
Size Effect ◽  
Specimen Size ◽  
J Integral

Ductile Crack Growth Resistance and Rotation Behavior of Miniature C(T) Specimen

2020 ◽  
Author(s):  
Tomoki Shinko ◽  
Masato Yamamoto
Keyword(s):  
Fracture Toughness ◽  
Size Effect ◽  
Crack Growth ◽  
Crack Extension ◽  
Crack Tip ◽  
Crack Growth Resistance ◽  
Specimen Size ◽  
Ductile Crack ◽  
Rotation Center ◽  
Ductile Crack Growth

Abstract A utilization of a miniature compact tension (Mini-C(T)) specimen is expected to enable effective use of limited remaining surveillance specimens for the structural integrity assessment of a Reactor Pressure Vessel (RPV). For developing a direct fracture toughness evaluation method using Mini-C(T) specimen in the upper-shelf temperature range as well as ductile-brittle transition temperature range, this study is aimed to experimentally characterize the Mini-C(T) specimen’s size effect on ductile crack growth resistance and interpolate its mechanism. Mini-C(T) specimen and 0.5T-C(T) specimen were prepared from a Japanese RPV steel SQV2A, and the ductile crack growth tests were conducted on them at room temperature. As a result, the crack growth resistance of Mini-C(T) and 0.5T-C(T) specimens are comparable if the crack extension Δa is less than 0.5 mm. On the other hand, if Δa exceeds 0.5 mm, the crack growth resistance of Mini-C(T) specimen becomes lower than that of 0.5T-C(T) specimen. The measurements of stretch zone width and depth support the fact that the fracture toughness for ductile crack initiation of Mini-C(T) specimen is lower than that of 0.5T-C(T) specimen. From the rotational (crack mouth opening) deformation of Mini-C(T) specimen was measured by simultaneously measuring load-line and front face displacements. The distance between the crack tip and the rotation center of Mini-C(T) specimen is smaller than that of 0.5T-C(T) specimen during the test. Furthermore, The plastic zone in front of the crack tip reaches the rotation center up to the crack extension of Δa = 0.3 mm on Mini-C(T) specimen, indicating that the mechanism of the specimen size effect of Mini-C(T) specimen is likely a plastic constraint due to the influence of the rotation center locating near the crack tip. This suggests that the specimen size effect of Mini-C(T) specimen on ductile crack growth resistance is expected to be corrected by considering an effect of the plastic constraint.

scholarly journals Fracture Toughness Evaluation and Specimen Size Effect

2001 ◽  
Vol 42 (1) ◽  
pp. 52-57 ◽  
Author(s):  
Toshiro Kobayashi ◽  
Shigeki Morita ◽  
Hiroyuki Toda
Keyword(s):  
Fracture Toughness ◽  
Size Effect ◽  
Specimen Size ◽  
Toughness Evaluation ◽  
Fracture Toughness Evaluation
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