An Analysis of Deformation and Fracture Behaviour of Zircaloy-4 Alloy Using Small Punch Test

2005 ◽  
Vol 475-479 ◽  
pp. 1415-1420 ◽  
Author(s):  
M.D. Callaghan ◽  
Wing Yiu Yeung ◽  
Maurice I. Ripley ◽  
David G. Carr
Keyword(s):  
Small Volume ◽  
Research Reactor ◽  
Fracture Strain ◽  
Fracture Behaviour ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Deformation And Fracture ◽  
Core Components ◽  
Radiation Induced

The small punch (SP) test is a novel technique that uses a relatively small volume of material, to enable a measure of load versus deflection to determine the mechanical behaviour of the alloy. This study aims to investigate the mechanical properties of Zircaloy-4 (Zr-4) alloy which will be used for construction of many of the core components in ANSTO’s replacement research reactor at Lucas Heights in Australia. The Zr-4 alloy was hydrided under different conditions to simulate the radiation-induced reduction in fracture toughness over the service life of the reactor. The SP test was applied to determine the deformation and fracture behaviour of the hydrided materials. It was found that as the hydride formation increased, the equivalent fracture strain (eqf) of the alloy decreased to lower values.

On the Correlation of Fracture Quantities in Small Punch Test

2013 ◽  
Vol 592-593 ◽  
pp. 275-278
Author(s):  
Ferdinand Dobeš ◽  
Petr Dymáček
Keyword(s):  
Fracture Strain ◽  
Fracture Behaviour ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Strain Fracture ◽  
Constant Rate ◽  
Fracture Appearance ◽  
Mutual Relations

Several possible routes are available for estimation of fracture behaviour from the results of small punch tests performed at constant rate of deflection. The routes include: (i) measurement of relevant dimensions directly on ruptured specimens, (ii) determination of critical deflections on the load vs. deflection curves and (iii) integration of these curves up to specific points. Equivalent fracture strain, fracture energy or fracture toughness are then evaluated from the obtained quantities. The mutual relations among the quantities are demonstrated by the results of small punch tests performed on a Fe-Al-based alloy in the temperature range extending from brittle up to ductile fracture appearance.

Small punch test on the analysis of fracture behaviour of PLA-nanocomposite films

2014 ◽  
Vol 33 ◽  
pp. 21-29 ◽  
Author(s):  
C. Rodríguez ◽  
D. Arencón ◽  
J. Belzunce ◽  
M.Ll. Maspoch
Keyword(s):  
Fracture Behaviour ◽  
Nanocomposite Films ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test

Investigation of the Hydrogen Embrittlement on the 65Mn Steel from the Nuclear Power Plant with Small Punch Method

2010 ◽  
Vol 118-120 ◽  
pp. 206-210
Author(s):  
Zhao Xi Wang ◽  
Hui Ji Shi ◽  
Guo Dong Zhang ◽  
Bao Ping Qu ◽  
Jian Lu ◽  
...  
Keyword(s):  
Nuclear Power ◽  
Room Temperature ◽  
Fracture Strain ◽  
Small Punch Test ◽  
Small Punch ◽  
Punch Test ◽  
Charging Time ◽  
Intergranular Brittle Fracture ◽  
Charging Current ◽  
Total Impact

Damage of metals due to the influence of hydrogen is quite frequent and leads to dangerous failures. The characteristics of the hydrogen embrittlemnt of the 65Mn steel were evaluated with small punch test. With the increment of the amount of the hydrogen absorbed into the alloy at room temperature, the strength and the toughness of the material reduce. From the small punch experimental results, it is found the total impact energy, the fracture strain and the fracture stress decrease with the increment of the cathodic hydrogen charging time. The fracture surfaces change from the typical ductile fracture with big voids to the typical intergranular brittle fracture mode after hydrogen absorbed in the specimens with higher charging current density.

Finite Element Modelling of Small Punch Test on 304H Stainless Steel

2007 ◽  
Vol 345-346 ◽  
pp. 1165-1168
Author(s):  
David Sunjaya ◽  
Tao Wei ◽  
Robert Harrison ◽  
Wing Yiu Yeung
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Fracture Strain ◽  
Small Punch Test ◽  
Small Disk ◽  
Small Punch ◽  
Punch Test ◽  
Heat Treated ◽  
Test Materials ◽  
Good Agreement

The small punch test (SPT) is a relatively new mechanical testing technique capable of utilising small disk-shaped specimens to determine the mechanical behaviour of the test materials. From the test data, fracture properties in particular the equivalent fracture strain (εqf) can be determined and the elastic-plastic fracture toughness of a material can be characterised. Finite element analyses (FEA) of the small punch tests have been performed for the 304H stainless steel in this study. 304H stainless steel was isothermally aged at 650, 700 and 750oC for durations up to 200 hours. Small punch tests were performed to assess the mechanical properties of the heat treated materials. Using the input of the true stress-strain curves of material constitutive behaviour, the theoretical load vs punch displacement curves calculated from the FEA models were found in good agreement with the experimental results. The fracture thickness of the small punch tested specimens and the equivalent fracture strain were also be determined for the test materials.

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