Probabilistic analysis of cleavage fracture in commercial polycrystalline tungsten
Source abstract
Abstract
Polycrystalline tungsten is a promising candidate as plasma-facing armour material in future fusion reactors. Below the DBTT tungsten shows brittle or semi-brittle behaviour with no or little plastic deformation before cleavage fracture. Moreover, tungsten has an inherent low fracture toughness as well as a large scatter within the strength properties. This requires a statistical treatment of the strength values. Therefore, four-point bending tests in the temperature range of room temperature (RT) to 400 °C were performed to allow the Weibull analysis in brittle failure regime and/or the Beremin model analysis in case of onset of plastic behaviour while approaching the DBTT temperature. The analyses are supported by FE simulations. Weibull and Beremin parameter values are determined from the simulation results using post-processing codes.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Fusion materials and technologies · Nuclear Materials and Properties · Microstructure and Mechanical Properties of Steels
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (37)
Show source-provided references
1. Tungsten as a Plasma-Facing Material10.1016/B978-0-08-056033-5.00118-X ↗
2. Brittle–ductile transitions in polycrystalline tungsten10.1080/14786435.2010.502145 ↗
3. Anisotropic fracture behaviour and brittle-to-ductile transition of polycrystalline tungsten10.1080/14786435.2010.504198 ↗
4. Fracture toughness of polycrystalline tungsten alloys10.1016/j.ijrmhm.2010.04.007 ↗
5. Lassner · 1999 · 124
6. Mechanical properties of tungsten in the transition temperature range10.1016/j.jnucmat.2013.11.019 ↗
7. Ductilisation of tungsten (W): on the shift of the brittle-to-ductile transition (BDT) to lower temperatures through cold rolling10.1016/j.ijrmhm.2015.09.001 ↗
8. Effect of grain orientation and heat treatment on mechanical properties of pure W10.1016/j.jnucmat.2014.07.034 ↗
9. Effect of low-temperature rolling on the tensile behavior of commercially pure tungsten10.1016/j.msea.2008.01.013 ↗
10. Munz · 1999
11. W. Weibull: A statistical theory of the strength of materials, 1939.
12. A local criterion for cleavage fracture of a nuclear pressure vessel steel10.1007/BF02663302 ↗
13. Probabilistic failure analysis of a water-cooled tungsten divertor: impact of embrittlement10.1016/j.jnucmat.2008.01.009 ↗
14. Considering brittleness of tungsten in failure analysis of helium-cooled divertor components with functionally graded tungsten/EUROFER97 joints10.1016/j.engfracmech.2012.07.024 ↗
15. Ductile to brittle transition in ITER specification tungsten assessed by combined fracture toughness and bending tests analysis10.1016/j.msea.2019.02.028 ↗
16. Manufacturing influences on microstructure and fracture mechanical properties of polycrystalline tungsten
17. Standard · 2009
18. An analysis of the influence of grain boundary strength on microstructure dependent fracture in polycrystalline tungsten10.1007/s10704-016-0083-0 ↗
19. DIN EN 843-1:2006: Advanced technical ceramics–Mechanical properties of monolithic ceramics at room temperature–Part 1: determination of flexural strength, 2006.
20. Post-examination of helium-cooled tungsten components exposed to DEMO specific cyclic thermal loads10.1016/j.fusengdes.2009.01.048 ↗
21. Current state-of-the-art manufacturing technology for He-cooled divertor finger10.1016/j.jnucmat.2010.12.113 ↗
22. DIN EN 843-5:2006: Advanced technical ceramics–Mechanical properties of monolithic ceramics at room temperature. Part 5: statistical analysis, 2006.
23. DIN EN 61649:2008: Weibull analysis, 2009.
24. 2018
25. Weakest link theory reformulated for arbitrary fracture criterion10.1111/j.1151-2916.1978.tb09327.x ↗
26. Discrimination of multiaxiality criteria using brittle fracture loci10.1016/0955-2219(96)00055-6 ↗
27. Influence of the fracture criterion on the failure prediction of ceramics loaded in biaxial flexure10.1111/j.1151-2916.1991.tb07295.x ↗
28. ASTM Standard: C 1161 − 18: standard Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature, ASTM Book of Standards, 2018.
29. DIN EN 843-5:2006: Statistische Auswertung, 2007.
30. DIN EN 843-1:2006: Bestimmung der Biegefestigkeit, 2008.
31. STAU – A review of the Karlsruhe weakest link finite element postprocessor with extensive capabilities10.3139/146.101735 ↗
32. On the contribution of notches to the failure probability of ceramic components10.1016/0955-2219(96)00011-8 ↗
33. Coupling of the Weibull stress model and macroscale models to predict cleavage fracture10.1016/j.engfracmech.2003.08.004 ↗
34. C. Ruggieri and R. Dodds, "WSTRESS Release 1.0: numerical Computation of Probabilistic Fracture Parameters," 1996.
35. Riesch-Oppermann · 1998
36. ABAQUS Inc.: https://abaqus-docs.mit.edu/2017/English/SIMACAEMATRefMap/simamat-c-deformationplast.htm, (Accessed May 10, 2022).
37. B. Gludovatz, S. Wurster, A. Hoffmann, et al., "Influence of deformation, microstructure and temperature on the fracture resistance of tungsten," ed: preparation, 2010.