Use of Subsized Specimen for Evaluating the Strength and Fracture Toughness of Irradiated 2 1/4 Cr-1 M0 Steel

1992 ◽  
Vol 114 (2) ◽  
pp. 168-171 ◽  
Author(s):  
X. Mao ◽  
H. Takahashi ◽  
T. Kodaira
Keyword(s):  
Fracture Toughness ◽  
Tensile Test ◽  
Ultimate Strength ◽  
Electrical Potential ◽  
Potential Method ◽  
Strength Increase ◽  
Irradiation Hardening ◽  
Small Punch ◽  
Irradiation Test

The procedure of the determination of yield and ultimate strengths of irradiated 2 1/4 Cr-1 M0 steel using small punch specimen (10 mm by 10 mm by 0.5 mm) has been demonstrated. The result was compared with the result obtained from conventional tensile test. Fracture toughness of irradiated 2 1/4 Cr-1 M0 steel was measured by use of subsized CT specimen and D. C. electrical potential method. Owing to irradiation hardening of 2 1/4 Cr-1 M0 steel, yield and ultimate strength increase substantially and fracture toughness decreases 37 percent when the steel is irradiated to a fluence of 3.2 x 1023 n/m2. The small punch and subsized CT specimen can be used for irradiation test so that considerable irradiation space will be saved.

Determination of Material Fracture Toughness by Circular Pre-Cracked Small Punch Test Specimens

2019 ◽  
Vol 795 ◽  
pp. 165-171
Author(s):  
Wu Lin Wang ◽  
Du Wei Wang ◽  
Kai Shu Guan
Keyword(s):  
Fracture Toughness ◽  
Empirical Correlation ◽  
Fracture Toughness Test ◽  
J Integral ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Determination Procedure ◽  
Material Fracture

Fracture toughness empirical correlation between SPT(Small Punch Test) with non-crack sample and standard fracture toughness test has been established in recent years. In order to compensate the imperfection of empirical correlation, such as absence theoretical basis, poor repeatability and universality, in this paper, an O-type pre-cracked sample was adopted to evaluate fracture toughness. The mechanical model of the sample is in compliance with plane strain condition in the direction of crack propagation. In this paper a determination procedure was studied and established, and the J-integral of steel Q345R was calculated using the procedure.

scholarly journals Determination of Strength and Fracture Toughness of Small Ceramic Discs Using the Small Punch Test and the Ball-on-three-balls Test

2014 ◽  
Vol 3 ◽  
pp. 961-966 ◽  
Author(s):  
Stefan Rasche ◽  
Stefan Strobl ◽  
Meinhard Kuna ◽  
Raul Bermejo ◽  
Tanja Lube
Keyword(s):  
Fracture Toughness ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test

Determination of Mode of Damage During Creep-Fatigue Interaction

2005 ◽  
Vol 128 (2) ◽  
pp. 248-252
Author(s):  
M. Javed Hyder
Keyword(s):  
Hysteresis Loop ◽  
Electrical Potential ◽  
Potential Method ◽  
Damage Mode ◽  
Clear Indication ◽  
Creep Fatigue ◽  
Damage Process

A technique has been developed using the reversing dc electrical potential method to determine the mode of damage taking place during creep-fatigue interaction. It is observed that the hysteresis loop created by plotting the stress verses electrical potential gives a clear indication whether the damage in process is creep dominated or fatigue-dominated. During the fatigue-dominated damage process the hysteresis loop of stress verses electrical potential changes the shape whereas during the creep-dominated damage process the hysteresis loop of stress verses electrical potential does not change the shape but moves in the direction of higher electrical potential values. These changes are observed well before any indication seen on the conventional hysteresis loop of stress verses strain. This identification of the damage mode is observed well before failure occurs. The conclusion has been confirmed through fractographs. Hence it can be said that this technique eliminates the need for fractographs when determining the mode of damage during creep-fatigue interaction.

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