Volume 6A: Materials and Fabrication最新文献_第3页

Correlation of Plain and Notched Bar Creep Behavior in Grade 91 Steel 91级钢平棒与缺口棒蠕变行为的相关性

Volume 6A: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-94007

Yukio Takahashi, H. Shigeyama, J. Siefert

引用次数: 2

Influence of an Elevated Temperature Environment on the Tensile Mechanical Properties of a 3D Printed Thermoplastic Polymer 高温环境对3D打印热塑性聚合物拉伸力学性能的影响

Volume 6A: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93589

J. Torres, Otito Onwuzurike, A. McClung, Juan Ocampo

{"title":"Influence of an Elevated Temperature Environment on the Tensile Mechanical Properties of a 3D Printed Thermoplastic Polymer","authors":"J. Torres, Otito Onwuzurike, A. McClung, Juan Ocampo","doi":"10.1115/pvp2019-93589","DOIUrl":"https://doi.org/10.1115/pvp2019-93589","url":null,"abstract":"\u0000 The purpose of this study is to examine the effects of the environment on 3D printed Polylactic Acid (PLA), a biodegradable thermoplastic polymer. The experimental program was specifically designed to explore the influence of print temperature and aging temperature on the mechanical performance of the printed material. Printing at the elevated temperatures (30–40°C) resulted in slight mechanical property changes. In order to understand which of the changes could also be caused by simply storing the materials at the elevated temperature, samples were printed at 25°C and subsequently aged (at 30–45°C) before mechanical testing. All mechanical testing was performed in standard laboratory temperature on an MTS Criterion. All of the mechanical properties were not greatly altered by printing or aging at elevated temperatures, suggesting that printing and using in extreme weather environments could be reasonable. The yield stress is not affected by storage at elevated temperatures, but is increased (or enhanced) by printing at elevated temperatures. The maximum stress is increased (or enhanced) by both aging and printing at elevated temperatures, but is accompanied by a large reduction in strain capacity. Changes that are observed in mechanical properties will be incorporated in future material models to accurately capture material behavior.","PeriodicalId":428760,"journal":{"name":"Volume 6A: Materials and Fabrication","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128643928","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 In-Plane and Out-of-Plane Constraint on Fracture Toughness in Austenitic Stainless Steel 面内和面外约束对奥氏体不锈钢断裂韧性的影响

Volume 6A: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93660

I. Palmer, M. Mokhtarishirazabad, A. Moffat, M. Mostafavi

引用次数: 1

Flaw Acceptance Evaluation for the Final Disposal Canister Under Earthquake Induced Rock Shear 地震岩石剪切作用下最终处置筒的缺陷验收评价

Volume 6A: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93165

Hsoung-Wei Chou, Szu-Ying Wu

{"title":"Flaw Acceptance Evaluation for the Final Disposal Canister Under Earthquake Induced Rock Shear","authors":"Hsoung-Wei Chou, Szu-Ying Wu","doi":"10.1115/pvp2019-93165","DOIUrl":"https://doi.org/10.1115/pvp2019-93165","url":null,"abstract":"\u0000 When a canister used for final disposal of spent nuclear fuel is in the deposition hole of deep geological repository, the loading case which would most impact the structure integrity of the canister is to postulate an earthquake induced rock shear through a deposition hole. This paper evaluates the acceptable sizes of defects in the cast iron insert of canister using fracture mechanics analysis. The submodelling technique of finite element analysis was employed to calculate the fracture behavior of the canister with postulated defects subjected to shear loads due to earthquake. At first, the stresses of the global model and the uncracked submodel were compared to check the correctness of the transferred displacements from the global model to the submodel. Then, surface and internal flaws with various shapes and depths were modeled individually in the submodel. A 5 cm shear displacement was applied on buffer and then transmitted to the canister. The calculations of J-integral of each flaw indicate that the surface semi-elliptical defect is more critical and the density of buffer material significantly affects the acceptable size of postulated defects. Present results can provide acceptance criteria of crack detection for canisters during manufacture and examination processes.","PeriodicalId":428760,"journal":{"name":"Volume 6A: Materials and Fabrication","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122163492","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

Modeling of Cracked Pipe System: Effect of Boundary Conditions on Displacement-Controlled and Load-Controlled Leak-Before-Break 裂纹管道系统的建模:边界条件对位移控制和载荷控制泄漏的影响

Volume 6A: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93927

M. Uddin, G. Wilkowski, E. Kurth, L. Hill, K. Bagnoli

{"title":"Modeling of Cracked Pipe System: Effect of Boundary Conditions on Displacement-Controlled and Load-Controlled Leak-Before-Break","authors":"M. Uddin, G. Wilkowski, E. Kurth, L. Hill, K. Bagnoli","doi":"10.1115/pvp2019-93927","DOIUrl":"https://doi.org/10.1115/pvp2019-93927","url":null,"abstract":"\u0000 In recent years, there has been a growing interest of using Leak-Before-Break (LBB) concept in the refining industry. LBB methodology has been applied in the nuclear industry for decades, but generally for elimination of hardware for dynamic rupture control at the design stage. However, in the refining industry the purpose of the LBB application could be quite different than for the nuclear industry. In the refining industry the purpose of LBB is to show in-service leakage can be detected well ahead the potential for rupture allowing for ample time for safe replacement of piping.\u0000 This paper explores conditions in which LBB can be applied to refinery piping. Initially, the analysis was conducted using a finite element model of a typical pipe system with its design boundary conditions under operating loadings, i.e., gravity, pressure, thermal and hanger loadings. The results with various circumferential crack sizes show a displacement-controlled manner (LBB is easy to satisfy) for the pipe system mainly due to higher secondary stresses, i.e., thermal loadings. However, the pipe system behaved in a load-controlled manner (LBB is harder to satisfy) when some of the boundary conditions were changed simulating a possible support failure and/or hanger failure. This paper investigates how boundary conditions can change a displacement-controlled LBB behavior to load-controlled LBB for a representative pipe system and the implications regarding leak rate detection capability. The effect of material’s toughness reduction due to high-temperature hydrogen-attack (HTHA) damage was also included in these analyses. The procedure outlined here can be applied to a piping system to identify piping supports that are critical for inspection to demonstrate LBB, and the anticipated leak rate before reaching critical flaw size.","PeriodicalId":428760,"journal":{"name":"Volume 6A: Materials and Fabrication","volume":"68 10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130146572","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

High Temperature Performance of Bonded Composite Repairs for Pressure Vessels 压力容器粘结复合材料修补件的高温性能

Volume 6A: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93632

I. Alnaser, M. Kiani, R. Walker, M. W. Keller

{"title":"High Temperature Performance of Bonded Composite Repairs for Pressure Vessels","authors":"I. Alnaser, M. Kiani, R. Walker, M. W. Keller","doi":"10.1115/pvp2019-93632","DOIUrl":"https://doi.org/10.1115/pvp2019-93632","url":null,"abstract":"\u0000 Bonded composite repairs are commonly used as both a temporary and permanent repair method to restore damaged pressure vessels and pipelines. This repair approach is used in a wide variety of industries, including the oil and gas industry. Design and qualification of repair method have been standardized by the ASME post-construction codes. Significant literature has been generated to understand the behavior of these repairs under a variety of loading conditions, both static and dynamic. However, this repair type has typically only been investigated at or near room temperature. As the application possibilities for these repairs expand, higher service temperatures have become a focus for both repair manufacturers and operators. High temperatures (> 250°F) have a number of impacts on polymer composites, including reducing the elastic modulus of the repair material, which tends to reduce the repair strength. Therefore, it is critical to understand the effect of temperature on both the individual composite components, as well as the overall composite repair system. The research presented here studies the influence of temperature on bonded composite repair systems at service pressure (3000 psi) and high temperature conditions. This high temperature is generated using a heating element inside the repaired vessel while contained inside an insulated oven. Strain measurements of the repair are also investigated during a quasi-static testing.","PeriodicalId":428760,"journal":{"name":"Volume 6A: Materials and Fabrication","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127723679","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 Novel Heat Input Equation for Analysis Welding Thermal Distribution and Welding Residual Stress 一种分析焊接热分布和焊接残余应力的新型热输入方程

Volume 6A: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93362

Linwei Ma, Xiaotao Zheng, Wang Wei, Wei Lin, Jianmin Xu, Jiuyang Yu

{"title":"A Novel Heat Input Equation for Analysis Welding Thermal Distribution and Welding Residual Stress","authors":"Linwei Ma, Xiaotao Zheng, Wang Wei, Wei Lin, Jianmin Xu, Jiuyang Yu","doi":"10.1115/pvp2019-93362","DOIUrl":"https://doi.org/10.1115/pvp2019-93362","url":null,"abstract":"\u0000 In the numerical simulation of welding residual stress (WRS), the thermal fields distribution of the weld beads during welding process is the basic data to calculate the residual stress due to thermal expansion and extraction. Different welding heat input control method had been proposed and used in the WRS finite element method (FEM) analysis, such as input based on theory, input controlled by temperature monitoring point and so on. Some disadvantages like less calculating efficiency, unexpected temperature variation have been found in these methods. Based on the study of the FEM result of temperature distribution through the weld butter field by using constant unit heat input, the heat transfer activities of each weld bead were researched. And a novel heat input fitted equation was proposed to describe the suitable heat input data for each weld bead of the welding process. More reliable and uniform melting temperature of weld beads with different location could be achieved. And the welding residual stresses from different welding thermal field of theory method, temperature monitoring point method, and novel heat input equation method are compared with the measured WRS results. The results show that the WRS achieved from the novel heat input equations is close to the measured result and has more computational efficiency. The uncertain WRS data used for probability safety assessment were also proposed based on the FEM results with the novel heat input equation method.","PeriodicalId":428760,"journal":{"name":"Volume 6A: Materials and Fabrication","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126839947","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

Master Curve Procedure Accounting for the Combined, Constraint, Ductile Tearing and Loading Rate Effects 考虑综合、约束、韧性撕裂和加载率影响的主曲线程序

Volume 6A: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93844

S. Lindqvist, K. Wallin

引用次数: 1

Leak Rates Through Complex Crack Paths: Update on the Latest Developments From the European Project ATLAS+ 复杂裂缝路径的泄漏率:来自欧洲项目ATLAS+的最新进展

Volume 6A: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93944

Peter Gill, T. Nicak, Brian Daniels, F. Obermeier

{"title":"Leak Rates Through Complex Crack Paths: Update on the Latest Developments From the European Project ATLAS+","authors":"Peter Gill, T. Nicak, Brian Daniels, F. Obermeier","doi":"10.1115/pvp2019-93944","DOIUrl":"https://doi.org/10.1115/pvp2019-93944","url":null,"abstract":"\u0000 Leak-before-Break assessments require a reliable method to obtain leakage rates from narrow cracks. The ability to predict leakage accurately is crucial to the overall success of Leak-before-Break arguments as the detection capability and limiting crack size are often very small. This can make it difficult to achieve the desired margin between limiting defect size and the crack size required for detectable leakage. The resulting narrow flow paths (< 0.1mm) relative to the wall thickness (> 10mm) necessitates the use of complex thermodynamic and friction models in the leak rate calculation.\u0000 A method to calculate leakage rates through complex paths was presented in PVP2015-45468 using an ordinary differential equation (ODE) for Mach number. This model was developed to account for crack opening displacements that vary non-linearly through the wall of a pipe. This situation typically arises when there is a through wall crack at a weld, where significant residual stresses are present. This paper considers an FEA model of a plate with a weld residual stress (WRS) profile applied. The WRS is prescribed with nodal displacements, and the COD is calculated from post processing of the elastic stress analysis solution. This results in a COD function in terms of the distance through the wall, which can then be used in the leak rate calculation. Comparisons are made with the R6 methodology recommended software DAFTCAT and the benefits of using the ODE method are discussed.\u0000 In collaboration with Framatome, Germany, a test case based on the previous European project STYLE was considered. The test case involves a Type 316L Stainless Steel pipe with a girth weld, and the FEA model includes postulated through wall defects at the weld interface to assess crack opening displacements. This model will be used to extract crack opening displacements and calculate leak rates using various methods. Two phase flow will be considered for this test case as the pipe geometry is very relevant to PWRs.","PeriodicalId":428760,"journal":{"name":"Volume 6A: Materials and Fabrication","volume":"43 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121005097","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

CCG of PE100 and Life Prediction of PE Pipe With Axial Semi-Elliptical Crack PE100的CCG及带轴向半椭圆裂纹PE管的寿命预测

Volume 6A: Materials and Fabrication Pub Date : 2019-11-15 DOI: 10.1115/pvp2019-93556

Lei Zhang, Kai-ming Lin, Yang Fu, Bingjun Gao

{"title":"CCG of PE100 and Life Prediction of PE Pipe With Axial Semi-Elliptical Crack","authors":"Lei Zhang, Kai-ming Lin, Yang Fu, Bingjun Gao","doi":"10.1115/pvp2019-93556","DOIUrl":"https://doi.org/10.1115/pvp2019-93556","url":null,"abstract":"\u0000 High density polyethylene (HDPE) is widely used in city water and gas piping system and even in nuclear engineering for its excellent properties in flexibility, impact resistance, aging and corrosion resistance, reliable connection, long service life. It is generally believed that the typical failure mode of PE pipe under long-term static pressure load is the slow crack growth (SCG) caused by creep crack initiation (CCI) and creep crack growth (CCG), which is a kind of quasi-brittle failure. Scratching often occurs during PE pipe installation due to the drag of pipe without any protection, which would leave axial cracks as the initial defect. This would harm the long term performance of pressurized HDPE pipe. In the present work, the creep crack kinetics was experimentally determined in term of C* integral, and then CCG behavior of PE pipe with axial semi-elliptical crack was discussed. With the help of a CARE electronic universal testing machine and DIC displacement measuring system, creep tests are performed with smooth bar specimen of PE100 pipe parent material. And the stationary creep law parameters were determined. The crack opening displacement (COD) rates were determined by creep cracking test with cracked round bar specimen. With the help of compliance calibration tests, the COD curves were changed into crack propagation curves and the creep crack kinetics was eventually determined in term of C* integral. By assuming an semi-elliptical crack front with nearly the same C* integral, the creep crack propagation was predicted with the determined crack kinetics. And the allowable initial crack size was also determined for the PE pipe discussed. Compared with that determined in terms of SIF, current study yields much margin for the allowable initial crack.","PeriodicalId":428760,"journal":{"name":"Volume 6A: Materials and Fabrication","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133652832","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