Estimation of high-temperature fracture parameters for small punch specimen with a surface crack
- Authors
- Yoon, Kee Bong; Thanh Tuan Nguyen
- Issue Date
- May-2018
- Publisher
- WILEY
- Keywords
- C-t-parameter; creep crack growth; small-punch creep test; stress intensity factor; surface crack
- Citation
- FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, v.41, no.5, pp 1224 - 1236
- Pages
- 13
- Journal Title
- FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
- Volume
- 41
- Number
- 5
- Start Page
- 1224
- End Page
- 1236
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/2190
- DOI
- 10.1111/ffe.12767
- ISSN
- 8756-758X
1460-2695
- Abstract
- An outline of a newly proposed methodology for evaluating creep crack growth (CCG) parameters using cracked small-punch (SP) specimens is explained. Three-dimensional finite element analyses were performed to calculate the stress intensity factor along the crack front for a surface crack formed at the centre of a SP specimen. Effects of crack ratio, (a/t); crack aspect ratio, (a/c); and thickness of the specimen, (t), on the fracture parameters were studied. It was observed that the minimum variation of K-value along the crack front can be achieved when a/c was 0.50 except the location very near the intersection of the crack and free surface. This condition is similar to the case of constant K-values along the crack front of the conventional compact tension specimen. Thus, it can be argued that the SP specimen with a surface crack is a suitable specimen geometry for CCG testing. The proposed CCG test method was found to be practically applicable for the crack geometry of 0.10 to 0.30 of a/t with constant aspect ratio of 0.50. An estimation of the K and C-t-parameter under the small scale creep condition was derived. Future work for further development of the suggested CCG testing is discussed.
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