Details
| Original language | English |
|---|---|
| Pages (from-to) | 50-60 |
| Number of pages | 11 |
| Journal | Theoretical and Applied Fracture Mechanics |
| Volume | 87 |
| Publication status | Published - 2017 |
| Externally published | Yes |
Abstract
A linear applicable relationship is proposed to improve the cleavage failure probability prediction of preloaded specimens using the modified Beremin model. Maximum stress triaxility factor shows fracture load independency for enough high loads and a good sensitivity to crack tip stress changes due to residual stresses and preloads. Hence, it is selected as representative of crack tip stress state. Using recalibration for six experimental datasets of CT including different levels of pretension and precompression shows that only reference stress changes with changing the preload level and type. A linear relationship is derived to modify the reference stress for the preloaded cases as a function of maximum stress triaxiality factor which can be easily computed from the FE analysis. Using the proposed relationship simply leads to a considerable improvement for failure predictions in all cases with different geometries, materials and preloading conditions.
Keywords
- Failure probability, Modified Beremin model, Preloads, Reference stress, Residual stress, Stress triaxiality
ASJC Scopus subject areas
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
- Engineering(all)
- Mechanical Engineering
- Mathematics(all)
- Applied Mathematics
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In: Theoretical and Applied Fracture Mechanics, Vol. 87, 2017, p. 50-60.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The dependence of Weibull parameters on preloads and its implication on brittle fracture probability prediction using a local criterion
AU - Moshayedi, H.
AU - Sattari-Far, I.
N1 - Publisher Copyright: © 2016 Elsevier Ltd
PY - 2017
Y1 - 2017
N2 - A linear applicable relationship is proposed to improve the cleavage failure probability prediction of preloaded specimens using the modified Beremin model. Maximum stress triaxility factor shows fracture load independency for enough high loads and a good sensitivity to crack tip stress changes due to residual stresses and preloads. Hence, it is selected as representative of crack tip stress state. Using recalibration for six experimental datasets of CT including different levels of pretension and precompression shows that only reference stress changes with changing the preload level and type. A linear relationship is derived to modify the reference stress for the preloaded cases as a function of maximum stress triaxiality factor which can be easily computed from the FE analysis. Using the proposed relationship simply leads to a considerable improvement for failure predictions in all cases with different geometries, materials and preloading conditions.
AB - A linear applicable relationship is proposed to improve the cleavage failure probability prediction of preloaded specimens using the modified Beremin model. Maximum stress triaxility factor shows fracture load independency for enough high loads and a good sensitivity to crack tip stress changes due to residual stresses and preloads. Hence, it is selected as representative of crack tip stress state. Using recalibration for six experimental datasets of CT including different levels of pretension and precompression shows that only reference stress changes with changing the preload level and type. A linear relationship is derived to modify the reference stress for the preloaded cases as a function of maximum stress triaxiality factor which can be easily computed from the FE analysis. Using the proposed relationship simply leads to a considerable improvement for failure predictions in all cases with different geometries, materials and preloading conditions.
KW - Failure probability
KW - Modified Beremin model
KW - Preloads
KW - Reference stress
KW - Residual stress
KW - Stress triaxiality
UR - http://www.scopus.com/inward/record.url?scp=85006168194&partnerID=8YFLogxK
U2 - 10.1016/j.tafmec.2016.10.005
DO - 10.1016/j.tafmec.2016.10.005
M3 - Article
VL - 87
SP - 50
EP - 60
JO - Theoretical and Applied Fracture Mechanics
JF - Theoretical and Applied Fracture Mechanics
SN - 0167-8442
ER -