Volume 2: Computer Technology and Bolted Joints; Design and Analysis最新文献_第9页

Case Study to Evaluate Stresses in Welded Endplates in Structural Steel 评估结构钢焊接端板应力的实例研究

Volume 2: Computer Technology and Bolted Joints; Design and Analysis Pub Date : 2021-07-13 DOI: 10.1115/pvp2021-62084

Kshitij P. Gawande, A. Mayes, Raju Subedi

{"title":"Case Study to Evaluate Stresses in Welded Endplates in Structural Steel","authors":"Kshitij P. Gawande, A. Mayes, Raju Subedi","doi":"10.1115/pvp2021-62084","DOIUrl":"https://doi.org/10.1115/pvp2021-62084","url":null,"abstract":"\u0000 Endplates are widely used in the industry to attach supplementary steel structures to main building frames. These endplates can be attached to the building steel using a bolted connection or a welded connection. Industry often favors bolted connections due to ease of installation and availability of qualification methods per AISC 360 Design Guides. However, there are some applications where a welded connection is preferable, such as, cases requiring reduction of number of parts supplied or applications with higher chance of vibration causing loosening of bolts. The present case study discusses evaluation of stresses in welded endplates due to forces and moments from the attaching supplementary steel members. The study considers various welded connection scenarios including an endplate welded on two opposite sides and an endplate welded on all four sides. The stress distribution in the plate is studied using finite element analysis with wide flange and tube steel members attaching to it. ANSYS mechanical is used to perform the finite element analysis. Multiple combinations of plate sizes, weld patterns, and attaching member sizes are analyzed to provide a well-rounded solution. An analytical model is developed for the stress evaluation as well and the results are compared with the finite element model. The study is intended to provide an efficient methodology for plate evaluation and qualification.","PeriodicalId":23700,"journal":{"name":"Volume 2: Computer Technology and Bolted Joints; Design and Analysis","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87251948","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

Torsional Fatigue Test Applicable to Helical Spring Material Used in Candu Fuel Channel Spacers 适用于Candu燃油通道垫片用螺旋弹簧材料的扭转疲劳试验

Volume 2: Computer Technology and Bolted Joints; Design and Analysis Pub Date : 2021-07-13 DOI: 10.1115/pvp2021-63016

André Gagnon, T. Kashyap, D. Metzger

{"title":"Torsional Fatigue Test Applicable to Helical Spring Material Used in Candu Fuel Channel Spacers","authors":"André Gagnon, T. Kashyap, D. Metzger","doi":"10.1115/pvp2021-63016","DOIUrl":"https://doi.org/10.1115/pvp2021-63016","url":null,"abstract":"\u0000 In a particular nuclear application, separation between structural components is maintained by a helical spring such that the separating load bears across the diameter of the spring coils. Relative motion between the structural components due to changing load and temperature is accommodated by rolling of the spring. This rolling motion while under radial load results in cyclic loading of the spring material. Fatigue analysis of the cyclic loading must take into consideration the material degradation due to the unique operating environment, so testing of ex-service material is required. Standard fatigue test specimens are not possible due to the small dimensions of the spring component. Cyclic stress may be applied to the material via a reciprocating rolling motion as per the operating conditions but this approach has practical limitations with respect to cycle frequency and uncertainty in stress response. A fatigue test system has been developed in which cyclic stress is achieved by applying torsional load with respect to the axis of the helical spring. This load translates into a pure bending state of stress in the cross-section of the coils. The relationship between applied load and stress is achieved analytically through curved beam analysis. Some practical considerations in the test setup are discussed along with supporting analysis, and results obtained with specimens taken from pre-service components are presented. The outcome of the tests is compared to applicable data and it is concluded that the test method is effective in producing valid fatigue data.","PeriodicalId":23700,"journal":{"name":"Volume 2: Computer Technology and Bolted Joints; Design and Analysis","volume":"42 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90650722","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

Development of Minimum Pressurization Temperature Envelopes for Hydroprocessing Reactors - A Case Study 加氢反应器最小加压温度包壳的开发-一个案例研究

Volume 2: Computer Technology and Bolted Joints; Design and Analysis Pub Date : 2021-07-13 DOI: 10.1115/pvp2021-61954

Gurumurthy Kagita, Krishnakant V. Pudipeddi, Penchala S. K. Pottem, G. Achary, S. Sripada

{"title":"Development of Minimum Pressurization Temperature Envelopes for Hydroprocessing Reactors - A Case Study","authors":"Gurumurthy Kagita, Krishnakant V. Pudipeddi, Penchala S. K. Pottem, G. Achary, S. Sripada","doi":"10.1115/pvp2021-61954","DOIUrl":"https://doi.org/10.1115/pvp2021-61954","url":null,"abstract":"\u0000 Low alloy heavy-walled hydroprocessing reactors in the refining industry, which operate at elevated temperatures and high hydrogen environments, need to be designed for protection against brittle fracture especially during start-up and shutdown. While developing minimum pressurization temperature (MPT) envelopes for these reactors, both temper and hydrogen embrittlement effects must be considered. However, there are no specific rules to evaluate loss of toughness due to hydrogen embrittlement in the design Codes / fitness-for-service Standards. Earlier, Japanese steel and pressure vessel manufacturers (JSPVM) developed a methodology to estimate MPT envelope for Cr-Mo steel pressure vessels. Recently, a state-of-the-art fracture mechanics based methodology is published in Welding Research Council (WRC) Bulletin 562 to determine MPT envelopes for equipment operating in high-pressure hydrogen environments. Meanwhile, API RP 934-F draft provided guidance on developing MPT envelops for heavy wall Cr-Mo vessels. In this paper, a brief summary of the JSPVM, API and WRC approach is presented with flow charts. A case study of establishing the MPT envelopes for a typical hydroprocessing reactor using WRC, JSPVM and API approach is presented and the results are compared and discussed. The advantages and potential savings of using recent WRC approach are highlighted.","PeriodicalId":23700,"journal":{"name":"Volume 2: Computer Technology and Bolted Joints; Design and Analysis","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77836709","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

Numerical Analysis of the Crack Driving Force of Mismatched Girth Welded Pipes Subject to Large Plastic Deformations 大塑性变形下错配环焊管裂纹驱动力的数值分析

Volume 2: Computer Technology and Bolted Joints; Design and Analysis Pub Date : 2021-07-13 DOI: 10.1115/pvp2021-61188

Kaihao Wu, Hong Zhang, Yue Yang, Xiaoben Liu

{"title":"Numerical Analysis of the Crack Driving Force of Mismatched Girth Welded Pipes Subject to Large Plastic Deformations","authors":"Kaihao Wu, Hong Zhang, Yue Yang, Xiaoben Liu","doi":"10.1115/pvp2021-61188","DOIUrl":"https://doi.org/10.1115/pvp2021-61188","url":null,"abstract":"\u0000 Strength mismatched pipes with part-through cracks can suffer large plastic deformation from permanent ground deformations caused by geohazards. Thus, the crack driving force involved in engineering critical assessments plays an important role in guaranteeing pipeline integrity when pipes are subjected to complex loads induced by a hostile environment. In this paper, Python scripts are developed to generate up to 200 finite element models of strength mismatched pipes with various crack sizes under large plastic deformations based on the commercial software ABAQUS. The effects of crack length, crack depth, and strength mismatch factors on the evolution of crack tip opening displacement (CTOD) and global strain were investigated. An approximately linear relationship was observed in all cases tested with global strain values varying from 0.5% to 3%. Meanwhile, the value of the CTOD increased with the increase of crack length and crack depth, and decreased with increasing mismatch factor from the undermatch to the overmatch conditions. The effect of the crack depth on the CTOD is comparatively larger than the crack length, which presented an obvious change of the CTOD for deep cracks coupled with undermatched conditions. Overmatched welding only affected the value of CTOD slightly, while a drastic increase of CTOD value was observed for the undermatched welding conditions, especially for deep and long cracks.","PeriodicalId":23700,"journal":{"name":"Volume 2: Computer Technology and Bolted Joints; Design and Analysis","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75615480","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: 2

Structural Integrity Assessment of a Unit Cell in a Laboratory-Scale Printed Circuit Heat Exchanger for Molten Salt Reactors With Supercritical CO2 Power Cycle 实验室规模超临界CO2动力循环熔盐反应器印刷电路热交换器单元电池结构完整性评估

Volume 2: Computer Technology and Bolted Joints; Design and Analysis Pub Date : 2021-07-13 DOI: 10.1115/pvp2021-60735

S. Che, Sheng Zhang, A. Burak, Xiaodong Sun

{"title":"Structural Integrity Assessment of a Unit Cell in a Laboratory-Scale Printed Circuit Heat Exchanger for Molten Salt Reactors With Supercritical CO2 Power Cycle","authors":"S. Che, Sheng Zhang, A. Burak, Xiaodong Sun","doi":"10.1115/pvp2021-60735","DOIUrl":"https://doi.org/10.1115/pvp2021-60735","url":null,"abstract":"\u0000 The Printed Circuit Heat Exchanger (PCHE) is considered promising as an intermediate heat exchanger for Molten Salt Reactors (MSRs) due to its highly compact construction, high heat transfer effectiveness, and capability of withstanding high pressures. In this study, thermal-mechanical simulations were performed using a two-channel unit-cell model with the attempt to investigate the structural integrity of a laboratory-scale PCHE that was designed for molten salt-to-supercritical carbon dioxide heat transfer, with the temperature field obtained from Computational Fluid Dynamics (CFD) simulations. It is shown that the fillets on the semi-circular channel walls are stress concentration regions and that the stress intensity decreases quickly as the distance from the fillets increases. A quick drop in the maximum stress intensity is observed with the increase of the fillet radius. There is no significant increase in the stress intensity for locations around the zigzag sharp corners. With a lower bulk temperature and a higher stress intensity, the region close to the outlet of the PCHE hot channels is more vulnerable to potential failures than the inlet region of the hot channels. In addition, the choice of channel models has a weak impact on the maximum stress intensity around the cold channel fillets.","PeriodicalId":23700,"journal":{"name":"Volume 2: Computer Technology and Bolted Joints; Design and Analysis","volume":"43 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91482629","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: 1

Development of New Design Fatigue Curves in Japan – Treatment of Variable Loading Amplitude Effect 日本新设计疲劳曲线的开发——变载荷幅值效应的处理

Volume 2: Computer Technology and Bolted Joints; Design and Analysis Pub Date : 2021-07-13 DOI: 10.1115/pvp2021-60418

S. Asada, Y. Nomura

{"title":"Development of New Design Fatigue Curves in Japan – Treatment of Variable Loading Amplitude Effect","authors":"S. Asada, Y. Nomura","doi":"10.1115/pvp2021-60418","DOIUrl":"https://doi.org/10.1115/pvp2021-60418","url":null,"abstract":"\u0000 Design fatigue curves of new concept were developed in the Subcommittee on Design Fatigue Curve in the Atomic Energy Research Committee in the Japan Welding Engineering Society (JWES). Also, Working Group on Design Fatigue Curves (WG DFC) in the JSME is studying the validity and the applicability of the design fatigue curves developed in the JWES to incorporate into the JSME Environmental Fatigue Evaluation Method.\u0000 The developed design fatigue curve consists of the best-fit curves using tensile strength as a parameter, correction of mean stress effect employed the Smith-Watson-Topper approach, surface finish effect and variable loading amplitude effect. This paper discusses the treatment of variable loading amplitude effect in the improved design fatigue curves.\u0000 The developed design fatigue curves have employed the method of variable loading amplitude effect in EN 13445. This method uses a fatigue life exponent of −0.1 from N = 2 × 106. Research Group on Fatigue Strength in the JSME performed a series of fatigue tests for variable loading amplitude and the test data showed the fatigue life exponent was −0.07. This outcome of the JSME Research Group can support the fatigue life exponent of −0.1 in EN 13445.\u0000 A survey of the procedure of variable loading effect has been performed on a thermal fluctuation transient at mixed zone of T-junction piping of nuclear power plants for which UF is significantly affected by variable loading effect. Based on this study, the design fatigue curve for variable loading effect that starts from 2 × 106 with the slope of 1/10, which comes from EN 13445-3, can be considered to be applicable to the developed design fatigue curves. Also, the difference of UF between up to 1 × 108 and extension with no limit is relatively small, and the maximum number of cycles of 1 × 108 can be employed for the engineering fatigue analysis.","PeriodicalId":23700,"journal":{"name":"Volume 2: Computer Technology and Bolted Joints; Design and Analysis","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78655191","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: 1

Effects of a Single Overload on Fatigue Crack Growth of Type 316 Stainless Steel 单次过载对316不锈钢疲劳裂纹扩展的影响

Volume 2: Computer Technology and Bolted Joints; Design and Analysis Pub Date : 2021-07-13 DOI: 10.1115/pvp2021-61513

K. Miyoshi, M. Kamaya

{"title":"Effects of a Single Overload on Fatigue Crack Growth of Type 316 Stainless Steel","authors":"K. Miyoshi, M. Kamaya","doi":"10.1115/pvp2021-61513","DOIUrl":"https://doi.org/10.1115/pvp2021-61513","url":null,"abstract":"\u0000 The effect of a single overload on the fatigue crack growth rate was investigated for Type 316 stainless steel. Fatigue crack growth tests were conducted by controlling strain and load. Tensile and compressive overloads were applied during constant amplitude cycling. The overload ratio, which was defined as the ratio of overload size to baseline constant amplitude, was also changed. The constant amplitude tests were conducted at the strain or the stress ratio of −1.0 which was defined as the ratio of the minimum value to the maximum value. The crack opening point was obtained by the unloading elastic compliance method. The crack growth rate increased after the single compressive overload. The accelerating rate increased with the overload ratio. In contrast, not only the acceleration but also the retardation of the crack growth rate was observed for some tensile overload cases. The crack growth rate increased for relatively small tensile overload cases and decreased for relatively large tensile overload cases. The change in the crack opening level was examined. The crack growth rates after tensile and compressive single overloads correlated with the effective strain and stress intensity factor ranges both for load and strain controlling modes.","PeriodicalId":23700,"journal":{"name":"Volume 2: Computer Technology and Bolted Joints; Design and Analysis","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87994824","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: 1

Optimization for Nuclear Class 1 Opening Reinforcement 核1级开口加固优化

Volume 2: Computer Technology and Bolted Joints; Design and Analysis Pub Date : 2021-07-13 DOI: 10.1115/pvp2021-62839

W. Reinhardt

引用次数: 0

Applicability of Design Rules for Openings in Shells, ASME B&PV Code, Section VIII, Division 2 - A Case Study 壳体开口设计规则的适用性，ASME & pv规范，第VIII节，第2部分-一个案例研究

Volume 2: Computer Technology and Bolted Joints; Design and Analysis Pub Date : 2021-07-13 DOI: 10.1115/pvp2021-62020

Gurumurthy Kagita, Krishnakant V. Pudipeddi, S. Sripada

{"title":"Applicability of Design Rules for Openings in Shells, ASME B&PV Code, Section VIII, Division 2 - A Case Study","authors":"Gurumurthy Kagita, Krishnakant V. Pudipeddi, S. Sripada","doi":"10.1115/pvp2021-62020","DOIUrl":"https://doi.org/10.1115/pvp2021-62020","url":null,"abstract":"\u0000 The Pressure-Area method is recently introduced in the ASME Boiler and Pressure Vessel (B&PV) Code, Section VIII, Division 2 to reduce the excessive conservatism of the traditional area-replacement method. The Pressure-Area method is based on ensuring that the resistive internal force provided by the material is greater than or equal to the reactive load from the applied internal pressure. A comparative study is undertaken to study the applicability of design rules for certain nozzles in shells using finite element analysis (FEA). From the results of linear elastic FEA, it is found that in some cases the local stresses at the nozzle to shell junctions exceed the allowable stress limits even though the code requirements of Pressure-Area method are met. It is also found that there is reduction in local stresses when the requirement of nozzle to shell thickness ratio is maintained as per EN 13445 Part 3. The study also suggests that the reinforcement of nozzles satisfy the requirements of elastic-plastic stress analysis procedures even though it fails to satisfy the requirements of elastic stress analysis procedures. However, the reinforcement should be chosen judiciously to reduce the local stresses at the nozzle to shell junction and to satisfy other governing failure modes such as fatigue.","PeriodicalId":23700,"journal":{"name":"Volume 2: Computer Technology and Bolted Joints; Design and Analysis","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77761734","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

A Comprehensive Review on Failure Analysis of Electrofusion Joint For Plastic Pipes 塑料管电熔接头失效分析综述

Volume 2: Computer Technology and Bolted Joints; Design and Analysis Pub Date : 2021-07-13 DOI: 10.1115/pvp2021-62132

Ge Zhoutian, Yao Riwu, Jianfeng Shi, Jinyang Zheng

引用次数: 0