Please use this identifier to cite or link to this item:
https://doi.org/10.1016/j.engfracmech.2008.03.011
DC Field | Value | |
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dc.title | Cleavage fracture modeling of pressure vessels under transient thermo-mechanical loading | |
dc.contributor.author | Qian, X. | |
dc.contributor.author | Dodds Jr., R.H. | |
dc.contributor.author | Yin, S. | |
dc.contributor.author | Bass, R. | |
dc.date.accessioned | 2014-06-17T08:15:17Z | |
dc.date.available | 2014-06-17T08:15:17Z | |
dc.date.issued | 2008-09 | |
dc.identifier.citation | Qian, X., Dodds Jr., R.H., Yin, S., Bass, R. (2008-09). Cleavage fracture modeling of pressure vessels under transient thermo-mechanical loading. Engineering Fracture Mechanics 75 (14) : 4167-4189. ScholarBank@NUS Repository. https://doi.org/10.1016/j.engfracmech.2008.03.011 | |
dc.identifier.issn | 00137944 | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/65302 | |
dc.description.abstract | The next generation of fracture assessment procedures for nuclear reactor pressure vessels (RPVs) will combine non-linear analyses of crack front response with stochastic treatments of crack size, shape, orientation, location, material properties and thermal-pressure transients. The projected computational demands needed to support stochastic approaches with detailed 3-D, non-linear stress analyses of vessels containing defects appear well beyond current and near-term capabilities. In the interim, 2-D models become appealing to approximate certain classes of critical flaws in RPVs, and have computational demands within reach for stochastic frameworks. The present work focuses on the capability of 2-D models to provide values for the Weibull stress fracture parameter with accuracy comparable to those from very detailed 3-D models. Weibull stress approaches provide one route to connect non-linear vessel response with fracture toughness values measured using small laboratory specimens. The embedded axial flaw located in the RPV wall near the cladding-vessel interface emerges from current linear-elastic, stochastic investigations as a critical contributor to the conditional probability of initiation. Three different types of 2-D models reflecting this configuration are subjected to a thermal-pressure transient characteristic of a critical pressurized thermal shock event. The plane-strain, 2-D models include: the modified boundary layer (MBL) model, the middle tension (M(T)) model, and the 2-D RPV model. The 2-D MBL model provides a high quality estimate for the Weibull stress but only in crack front regions with a positive T-stress. For crack front locations with low constraint (T-stress < 0), the M(T) specimen provides very accurate Weibull stress values but only for pressure load acting alone on the RPV. For RPVs under a combined thermal-pressure transient, Weibull stresses computed from the 2-D RPV model demonstrate close agreement with those computed from the corresponding crack front locations in the 3-D RPV model having large negative T-stresses. Applications of this family of 2-D models provide Weibull stress values in excellent agreement with very detailed 3-D models while retaining practical levels of computational effort. © 2008 Elsevier Ltd. All rights reserved. | |
dc.description.uri | http://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.engfracmech.2008.03.011 | |
dc.source | Scopus | |
dc.subject | Cleavage fracture | |
dc.subject | Crack front constraint | |
dc.subject | Middle tension (M(T)) specimen | |
dc.subject | Modified boundary layer model | |
dc.subject | Reactor pressure vessels (RPVs) | |
dc.subject | Thermal-mechanical transient | |
dc.subject | Weibull stress | |
dc.type | Article | |
dc.contributor.department | CIVIL ENGINEERING | |
dc.description.doi | 10.1016/j.engfracmech.2008.03.011 | |
dc.description.sourcetitle | Engineering Fracture Mechanics | |
dc.description.volume | 75 | |
dc.description.issue | 14 | |
dc.description.page | 4167-4189 | |
dc.description.coden | EFMEA | |
dc.identifier.isiut | 000257350300011 | |
Appears in Collections: | Staff Publications |
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