fracture assessment
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Structures ◽  
2022 ◽  
Vol 36 ◽  
pp. 580-588
Author(s):  
David Boyajian ◽  
Tadeh Zirakian ◽  
Christof Boyajian ◽  
Shen-En Chen

Author(s):  
Yuebao Lei ◽  
Peter Budden

Abstract In R6, the J-based failure assessment diagram (FAD) method is used in the fracture assessment, and is underpinned by the reference stress J scheme. Therefore, an assessment using the R6 FAD method is equivalent to a J prediction using the reference stress method. In this paper, the effect of global and local limit load solutions for defective elbows on the reference stress and hence the J predictions is investigated using published three dimensional elastic-plastic finite element (FE) J results, in order to create guidance for users to follow when performing structural integrity assessments of defective elbows using the R6 procedure. The results show that using the global limit load solutions recommended in this paper can lead to good and reasonably conservative J predictions. However, the availability of global limit load solutions is very limited. The results also show that using the local limit load evaluated from the local limit load model recommended in this paper can lead to conservative J predictions for most of the cases considered.


Author(s):  
Qibao Chu ◽  
Qing Wang ◽  
Yonggang Fang ◽  
Wei Tan

Abstract To ensure the structure integrity of the RPV, the main challenge is the embrittlement of beltline material. However, the stress of inlet or outlet nozzles of the RPV which are in general reinforced in comparison with the beltline, is more complex especially under the thermal loads. In recently studies, a lot of works have been done to show that the nozzle region may be more challenging under some conditions. In this paper, a fracture assessment for the RPV nozzles subjected to pressure and thermal loading is discussed using the software ABAQUS 6.12 and Zen Crack 7.9-3. It includes: SIF calculation based on 3D finite element method; structural integrity assessment under a typical LOCA transient; and the fatigue crack growth evaluation under cyclic loading situations. The results show that the SIF along the crack front is obviously asymmetric, and only to assess the safety of the deepest point along the crack front in the ASME and RCC-MR codes may be reconsider. If the KIa criteria is applied, under a typical LOCA transient, it is difficult to obtain an effective fracture safety margin for a 1/4 thickness crack, while based on the KIC criteria, the nozzle is shown to be safe in the case study. The shape of the surface elongated crack (which is often easily produced in the nozzle area) tends to be circle under the cyclic pressure loading situation which shows the crack shape assumed in the ASME and RCC-MR codes is reasonable.


2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Jacob M. Mostert ◽  
Stephan R. Romeijn ◽  
Petra Dibbets-Schneider ◽  
Daphne D. D. Rietbergen ◽  
Lenka M. Pereira Arias-Bouda ◽  
...  

2021 ◽  
pp. 1-8
Author(s):  
Roope Jaatinen ◽  
Tiina Luukkaala ◽  
Heli Helminen ◽  
Markus T. Hongisto ◽  
Matti Viitanen ◽  
...  

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Suji Hong ◽  
Joohyun Kim ◽  
Sehyun Baek

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