Volume 3B: Design and Analysis最新文献_第6页

Three Dimensional Finite Element Analyses of Welding Residual Stresses of a Repaired Weld 修复焊缝焊接残余应力的三维有限元分析

Volume 3B: Design and Analysis Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84343

Mingya Chen, Weiwei Yu, F. Xue, Francis H. Ku, Zhilin Chen, Jinhua Shi

{"title":"Three Dimensional Finite Element Analyses of Welding Residual Stresses of a Repaired Weld","authors":"Mingya Chen, Weiwei Yu, F. Xue, Francis H. Ku, Zhilin Chen, Jinhua Shi","doi":"10.1115/PVP2018-84343","DOIUrl":"https://doi.org/10.1115/PVP2018-84343","url":null,"abstract":"The objective of this study is to correct installation non-conformance of a surge line using the excavation and re-weld method which is widely used in nuclear power plants. The surge line with a backslope was not at the required design level after initial installation. In order to solve the problem, a repairing technology is shown as follows: the weld was successively excavated and welded again while the surge line slope was corrected with the help of jacks. Because many of the degradation mechanisms relevant to power plant components can be accelerated by the presence of welding residual stresses (WRS), the WRS caused by the repairing process need to be studied. In this paper, the WRS simulation technique employed in this project is sophisticated. It utilizes a 3-D finite element (FE) model, and simulates the weld sequencing and excavation. Moreover, the WRS simulation performed in this project not only uses the un-axisymmetric model, but also considers the deformation caused by the external jacking loads. The results show that the repairing process is effective, and strain damage induced by the welding repair is also acceptable.","PeriodicalId":384066,"journal":{"name":"Volume 3B: Design and Analysis","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115484651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visualization of Thermal Fatigue Damage Distribution With Elastic-Plastic FEA 热疲劳损伤分布的弹塑性有限元可视化

Volume 3B: Design and Analysis Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84095

J. Miura, T. Fujioka, Y. Shindo

{"title":"Visualization of Thermal Fatigue Damage Distribution With Elastic-Plastic FEA","authors":"J. Miura, T. Fujioka, Y. Shindo","doi":"10.1115/PVP2018-84095","DOIUrl":"https://doi.org/10.1115/PVP2018-84095","url":null,"abstract":"This paper proposes simplified methods to evaluate fatigue damage in a component subjected to cyclic thermal loading, in order to visualize the distribution of usage factor using a graphical user interface (GUI) incorporated in a widely-used commercial CAE. The objective is to perform the evaluation and visualization using a standard desktop PC. In the previous paper, three simplified methods based on elastic finite-element analysis (FEA) were proposed in place of the method in the procedures employed in ASME Section III Subsection NH. In this paper, the methods have been improved for elastic-plastic FEA. A previously performed thermal fatigue test with a type 304 stainless steel cylinder was simulated. Heat transfer, elastic, and inelastic analyses were conducted. Simultaneously with the analyses performed, the equivalent total strain ranges and fatigue usage factor distributions were calculated using user subroutines developed in this study including three newly proposed simplified and ASME NH-based methods. These distributions can be visualized on a GUI incorporated in a commercial FEA code. The calculation results were consistent with the distribution of cracks observed. In addition, by using these, the analysts can visualize these distributions using their familiar CAE system.","PeriodicalId":384066,"journal":{"name":"Volume 3B: Design and Analysis","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116188780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dynamic Analysis and Evaluation of Control Rod Device Mechanism Missile Impact on Shielding Plate 控制杆装置机构导弹对屏蔽板冲击的动力学分析与评价

Volume 3B: Design and Analysis Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84351

X. Ye, F. Xiong, Bin Zheng, N. Jiang

{"title":"Dynamic Analysis and Evaluation of Control Rod Device Mechanism Missile Impact on Shielding Plate","authors":"X. Ye, F. Xiong, Bin Zheng, N. Jiang","doi":"10.1115/PVP2018-84351","DOIUrl":"https://doi.org/10.1115/PVP2018-84351","url":null,"abstract":"The flying of missile will severely jeopardize the structural integrity in control rod ejection accident. In order to analyze the strength of a new type of shielding plate under control rod drive mechanism (CRDM) missile impact, this article develops the simulation model and conducts the response analysis of the missile under 4 cases. In addition, the strain analysis and evaluation of protection shielding plate at the most dangerous case are performed. The motion analysis of CRDM missile indicates that the fracture at trapezoid thread place as well as the shielding plate rim under impact is most dangerous because the maximum kinetic energy of the impact can be obtained. So only this case should be examined when performing the evaluation of the shielding plate. Stress analysis shows the maximum stress intensity of the shielding plate will exceed the yielding stress and thereby local plasticity will occur. Strain analysis shows that compared with the extension ratio at structural failure, the computed strain still has margin to ensure the shielding plate will not be penetrated. Meanwhile the strain analysis of bolts which fix shielding plate are calculated. The strain level of two bolts are exceed limit and others is relatively low. The shield plate can be firmly fixed. Hence, this new type of the protection shielding plate is capable to prevent the damage of other components by the flying of CRDM missile.","PeriodicalId":384066,"journal":{"name":"Volume 3B: Design and Analysis","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122460201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Root Cause and FFS Analysis of a Dent in a 22mm Thick Elliptical Head 22mm厚椭圆封头凹痕的根本原因及FFS分析

Volume 3B: Design and Analysis Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84516

P. Schreurs, S. Kusters

{"title":"Root Cause and FFS Analysis of a Dent in a 22mm Thick Elliptical Head","authors":"P. Schreurs, S. Kusters","doi":"10.1115/PVP2018-84516","DOIUrl":"https://doi.org/10.1115/PVP2018-84516","url":null,"abstract":"This paper describes the failure of a jacketed vessel. The product pressure is 16 barg (inner vessel; D = 2200 mm) and is heated with thermal oil in the jacket (operated at 4barg). The jacket is split up in different zones which can be opened and closed separately. After a shut down, several valves were not opened properly. This resulted in blocking-in of the jacket on the top head of the vessel during the start-up and operation of the vessel. The vessel was heated to the operating temperature (±250°C), causing a pressure increase of the blocked-in thermal oil. The jacket has a wall thickness of 10 mm, and the vessel head has a wall thickness of 22 mm. Because of the pressure increase, failure occurred at a nozzle weld on the inner pressure vessel shell. This resulted in a leakage of thermal oil into the vessel. The jacket itself deformed but did not fail.\u0000 Based on a detailed FE analysis, it has been concluded that failure occurred as a result of (local) buckling of the 22mm thick elliptical head (diameter of ±2.200mm). This paper describes the failure that occurred and the assessments performed to determine and validate the root cause of the failure. A level 3 assessment according to ASME VIII div 2 Part 5 (1) was used to determine if the vessel is still safe for operation.","PeriodicalId":384066,"journal":{"name":"Volume 3B: Design and Analysis","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122948218","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of Primary and Secondary Creep Formulations on API 579-1 Residual Life Evaluation 初级和次级蠕变配方对API 579-1剩余寿命评估的影响

Volume 3B: Design and Analysis Pub Date : 2018-07-15 DOI: 10.1115/PVP2018-84407

Lorenzo Scano, L. Esposito

{"title":"Effects of Primary and Secondary Creep Formulations on API 579-1 Residual Life Evaluation","authors":"Lorenzo Scano, L. Esposito","doi":"10.1115/PVP2018-84407","DOIUrl":"https://doi.org/10.1115/PVP2018-84407","url":null,"abstract":"A sound material constitutive equation is crucial for the residual life evaluation of pressure components operating in the creep range. In a previous work [1], the authors investigated how a secondary creep formulation encompassing both the dislocational and the diffusional range influences the assessment of damage according to API 579-1 [2] within the whole component stress range. In the present paper the work has been extended in order to include the effects of primary creep in the constitutive equation for the ASTM A335 P22 low-alloy steel used for the manufacturing of the HRSG header whose welded details were previously investigated. The creep damage was first calculated according to API 579-1 Section 10 via inelastic, time-dependent FEA and the Larson-Miller approach (LMP) with code-defined, minimum time-to-rupture data. This led to a first reckoning of the primary creep impact in terms of API 579-1 residual life for the components under evaluation. The API 579-1 time-to-rupture was then assessed with a detailed stress analysis implementing the Omega Method and its creep strain rate formulation. The obtained results were finally compared to those previously determined through the LMP procedure and the different creep correlations (secondary and primary+secondary).","PeriodicalId":384066,"journal":{"name":"Volume 3B: Design and Analysis","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132354591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0