Abstract
The Weibull distribution is often applied in describing the scatter of the brittle fracture toughness KIC. Experimentally determined values for the Weibull slope factor have been found to vary between 2 and 10.
Two different approaches, one based on the original form of the Weibull distribution and the other based on the assumption of an effective volume characterizing the fracture process volume at the crack tip, have been applied in theoretical evaluation of the scatter. With both the methods, it is shown that the theoretical value for the slope factor should be equal to 4.
This result is also shown to be consistent with a newly developed statistical model describing carbide induced cleavage fracture in ferritic and bainitic steels.
The reason for the discrepancy between the theoretical value and the experimentally determined values of the slope factor is shown to be caused by inadequate number of experimental KIC-measurements.
Limits of the use of the Wei bull statistics in describing scatter in fracture toughness results is discussed.
Two different approaches, one based on the original form of the Weibull distribution and the other based on the assumption of an effective volume characterizing the fracture process volume at the crack tip, have been applied in theoretical evaluation of the scatter. With both the methods, it is shown that the theoretical value for the slope factor should be equal to 4.
This result is also shown to be consistent with a newly developed statistical model describing carbide induced cleavage fracture in ferritic and bainitic steels.
The reason for the discrepancy between the theoretical value and the experimentally determined values of the slope factor is shown to be caused by inadequate number of experimental KIC-measurements.
Limits of the use of the Wei bull statistics in describing scatter in fracture toughness results is discussed.
| Original language | English |
|---|---|
| Title of host publication | Application of Fracture Mechanics to Materials and Structures |
| Subtitle of host publication | Proceedings of the International Conference on Application of Fracture Mechanics to Materials and Structures, held at the Hotel Kolpinghaus, Freiburg, F.R.G., June 20–24, 1983 |
| Editors | G.C. Sih, E. Sommer, W. Dahl |
| Place of Publication | The Hague |
| Publisher | Martinus Nijhoff Publishers |
| Pages | 511-518 |
| ISBN (Electronic) | 978-94-009-6146-3 |
| ISBN (Print) | 978-94-009-6148-7 |
| DOIs | |
| Publication status | Published - 1984 |
| MoE publication type | A3 Part of a book or another research book |
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Cite this
Wallin, K., Saario, T., & Törrönen, K. (1984). Theoretical Scatter in Brittle Fracture Toughness Results Described by the Weibull Distribution. In G. C. Sih, E. Sommer, & W. Dahl (Eds.), Application of Fracture Mechanics to Materials and Structures: Proceedings of the International Conference on Application of Fracture Mechanics to Materials and Structures, held at the Hotel Kolpinghaus, Freiburg, F.R.G., June 20–24, 1983 (pp. 511-518). Martinus Nijhoff Publishers. https://doi.org/10.1007/978-94-009-6146-3_32