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Creation of a Life Prediction Model for Combined High-Cycle Fatigue and Creep 高周疲劳蠕变联合寿命预测模型的建立
IF 1.2 4区 材料科学 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-06-28 DOI: 10.1115/1.4054889
Thomas Bouchenot, Kirtan Patel, A. Gordon, S. Shinde
While industrial gas turbine blades are commonly designed to resist creep and high-cycle fatigue (HCF) failure, the combination of these two loading conditions is seldom considered. The effect of creep damage elicited prior or concurrent to HCF loading is not well established and can significantly reduce the HCF lifetime of these critical components. A comprehensive life prediction model capable of capturing these superimposed effects is needed to ensure current reliability standards are maintained when designing aggressively-loaded, next-generation industrial gas turbine blades. The consequence of combined HCF and creep loading to the lifetime a Ni-base superalloy is characterized and modeled in this study. Composition and calibration of the model is carried out using data from HCF tests conducted on virgin and pre-crept specimens at 750°C and 850°C. The experimental data encompasses a wide range of stress ratios and pre-creep strains to mimic to the expansive set of potential turbine blade loading conditions The proposed microstructurally-informed model is based on existing principles and relies on test data and information gathered from a comprehensive failure analysis of the tested samples.
虽然工业燃气轮机叶片通常设计为抗蠕变和高周疲劳(HCF)失效,但很少考虑这两种载荷条件的组合。在HCF加载之前或同时引起的蠕变损伤的影响尚未得到很好的确定,并且可以显着降低这些关键部件的HCF寿命。在设计高负荷的下一代工业燃气轮机叶片时,需要一个能够捕捉这些叠加效应的综合寿命预测模型,以确保保持当前的可靠性标准。本研究对高温镍基合金的HCF和蠕变载荷对其寿命的影响进行了表征和建模。模型的组成和校准是使用在750°C和850°C下对未加工和预蠕变试样进行的HCF试验数据进行的。实验数据包括广泛的应力比和预蠕变应变,以模拟潜在的涡轮叶片加载条件。所提出的微观结构知情模型基于现有原理,并依赖于从测试样品的全面失效分析中收集的测试数据和信息。
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引用次数: 0
Novel Modeling of Heat and Moisture Diffusion in Adhesive Joints 粘接接头热湿扩散的新模型
IF 1.2 4区 材料科学 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-06-17 DOI: 10.1115/1.4054828
Marco Gerini-Romagnoli, S. Nassar
A novel two-dimensional shear stress-heat and moisture diffusion model is proposed for adhesive single-lap-joints. Spatial and time-dependent material properties are derived from coupled partial differential equations governing moisture diffusion and heat transfer through the exposed adhesive edges. Constituting differential equations are numerically solved for the shear stress distribution in the bonded area. Several diffusion scenarios and boundary conditions are analyzed. Significant improvements are achieved in the prediction of the shear stress distribution in the adhesive layer, when compared to the one-dimensional models in the literature. Scenarios of moisture diffusion generate stress gradients through the bondline, while the relatively fast internal thermal conductivity reduces temperature differentials within the joint. Moisture diffusion in the adhesive layer is significantly accelerated at high temperature. The results of the proposed model show reasonable agreement with a three-dimensional Finite Elements Analysis.
提出了一种新的粘接单搭接的二维剪应力-热-湿扩散模型。空间和时间相关的材料特性由耦合的偏微分方程导出,通过暴露的粘合边缘控制水分扩散和热量传递。通过建立微分方程,对粘接区内的剪切应力分布进行了数值求解。分析了几种扩散情形和边界条件。与文献中的一维模型相比,在胶粘剂层剪切应力分布的预测方面取得了显着改进。水分扩散的情况下,通过结合线产生应力梯度,而相对较快的内部导热系数减小了接头内部的温差。在高温下,胶粘剂层中的水分扩散明显加快。该模型的计算结果与三维有限元分析结果基本一致。
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引用次数: 0
Extension of the Adjustable Localization Operator Method to Anisotropic Elasto-Plastic Behaviour for Low-Cycle Fatigue Life Prediction 可调局部化算子方法在各向异性弹塑性低周疲劳寿命预测中的推广
IF 1.2 4区 材料科学 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-04-08 DOI: 10.1115/1.4054289
Jean-Baptiste Le Bail, B. Levieil, S. Moyne, C. Doudard, S. Calloch
The adjustable localization operator method allows for the local analytical calculation of complex structures under multiaxial confined plasticity cyclic loadings. This study proposes a theoretical framework for the extension of the method to cover anisotropic yield surface materials. The application is carried out on steel tubes that have been axially compressed beforehand to create a bead that acts as a stress concentration factor during the fatigue loading process. The adjustable localization operator method is compared to the reference finite element anisotropic analysis at different steps of the fatigue design chain. Results have shown that, although a slight gap on the absolute strain values exists, the strain amplitude and thus the fatigue life are correctly predicted with a reduction of the calculation time by 100.
可调局部化算子方法可用于多轴约束塑性循环载荷下复杂结构的局部分析计算。本研究为将该方法扩展到各向异性屈服面材料提出了一个理论框架。该应用是在预先轴向压缩的钢管上进行的,以产生在疲劳加载过程中起应力集中因子作用的焊道。在疲劳设计链的不同步骤,将可调定位算子方法与参考有限元各向异性分析进行了比较。结果表明,尽管在绝对应变值上存在微小的间隙,但通过将计算时间减少100,可以正确地预测应变幅度,从而预测疲劳寿命。
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引用次数: 2
Experimental Study on Laser-Induced Surface Damage of a Single-Crystal Nickelbased Superalloy under CW Fiber Laser Scanning Process 连续光纤激光扫描过程中单晶镍基高温合金表面损伤的实验研究
IF 1.2 4区 材料科学 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-04-01 DOI: 10.1115/1.4054228
S. Nandam, A. Rao, A. Gokhale, S. Joshi
Single-crystal (SC) nickel-based superalloy castings offer high temperature mechanical properties that result in superior gas turbine engine performance and durability. These castings undergo various precision machining operations to remove a significant amount of material while manufacturing. Here, nickel-based superalloys are one of the most difficult materials to be cut. Therefore, novel concepts are being employed to improve their machinability including lowering their surface strength. This paper presents the introduction of laser-induced surface damage (LISD) on a second-generation SC nickel-based superalloy using a CW (continuous wave) fiber laser. Laser scanning experiments were performed on SC specimens in as-cast condition with a laser power of 1000 W, beam diameter of 1.2 mm and scanning speeds from 5.5 mm/s to 16.5 mm/s. The cross-sections of the laser irradiated surfaces were investigated by measuring the irradiated geometries (IRG), micro-structural changes, micro-segregations, solidification cracking and heat affected zone (HAZ). The IRG shows conduction mode of penetration with a high width-to-depth ratio under a bigger beam diameter and top-hat type beam profile. The IRG boundaries have irregular profiles due to the dissolution of inter-dendrite regions and eutectic phases. The IRG showed fine dendrites and solidification cracks with reduced micro-segregation levels. The solidification cracking is mainly attributed to thermal stresses and the micro-cracking in HAZ is attributed to the dissolution of low melting Mo and Ti eutectics. The evolved HAZ ranges from 15 to 20 % of the IRG depth. The LISD volume is evaluated as IRG plus HAZ for removal by machining process.
单晶(SC)镍基高温合金铸件提供高温机械性能,从而实现卓越的燃气涡轮发动机性能和耐久性。这些铸件经过各种精密加工操作,在制造过程中去除大量的材料。在这里,镍基高温合金是最难切割的材料之一。因此,新的概念被用来提高其可加工性,包括降低其表面强度。本文介绍了利用连续波光纤激光器对第二代SC镍基高温合金进行激光诱导表面损伤的研究。对铸态SC试样进行了激光扫描实验,激光功率为1000 W,光束直径为1.2 mm,扫描速度为5.5 ~ 16.5 mm/s。通过测量激光辐照表面的辐照几何形状(IRG)、显微组织变化、微偏析、凝固裂纹和热影响区(HAZ)来研究激光辐照表面的截面。在较大的光束直径和顶帽型光束剖面下,IRG表现出高宽深比的穿透传导模式。由于枝晶间区域和共晶相的溶解,IRG边界具有不规则的轮廓。IRG表现出细小的枝晶和凝固裂纹,微观偏析程度降低。凝固裂纹主要由热应力引起,热影响区微裂纹主要由低熔点Mo和Ti共晶的溶解引起。演变的HAZ范围为IRG深度的15 - 20%。LISD体积被评估为IRG加HAZ,通过加工过程去除。
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引用次数: 2
Characterizing the Fatigue Behavior of Wrought Fe-Co-2V using Experimental Techniques 用实验技术表征锻造Fe-Co-2V的疲劳行为
IF 1.2 4区 材料科学 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-03-22 DOI: 10.1115/1.4054142
M. J. Mills, Jacob Biddlecom, B. Piñeyro, T. Khraishi, S. Grutzik, A. Brink, M. Brake, K. Johnson
Fe-Co-2V (Hiperco equivalent) is a soft ferromagnetic material that is commonly used for electrical components that require robust magnetic performance. Despite the excellent magnetic properties of Fe-Co-2V, it often exhibits low strength, ductility, and workability due to an ordered B2 microstructure. The mechanical properties exhibit considerable dependency on grain size and degree of order, which are influenced by processing methods. A thorough understanding of Fe-Co-2V’s fatigue performance is required to predict mechanical reliability under operating loads; however, limited fatigue data currently exists for Fe-Co alloys. This work characterizes the fatigue properties of wrought Fe-Co-2V through strain-controlled fatigue testing and fractography. Young’s Modulus, ultimate strength, and yield stress were determined through monotonic tension tests. The fatigue behavior was quantified using fully reversed, strain-controlled fatigue testing for applied strain amplitudes ranging from 0.10% to 1.00%. Subsequently, the Coffin-Manson strain-life curve was fit to the experimental data. Failure mechanisms were investigated through fractography with a scanning electron microscope. Inspection of the failure surfaces revealed that crack initiation occurred at defects located on or near the specimen surface with a localized region of crack propagation prior to the transgranular cleavage fracture. Additionally, two material models were calibrated from the experimental static and cyclic experimental testing. The characterization of the fatigue behavior of wrought Fe-Co-2V presented herein will aid in the fatigue analysis of Fe-Co-2V components and the development of analytical fatigue modelling methodologies.
Fe-Co-2V(Hiperco等效物)是一种软铁磁材料,通常用于需要坚固磁性性能的电气部件。尽管Fe-Co-2V具有优异的磁性,但由于有序的B2微观结构,它通常表现出较低的强度、延展性和可加工性。机械性能表现出对晶粒尺寸和有序度的相当大的依赖性,这受到加工方法的影响。需要全面了解Fe-Co-2V的疲劳性能,才能预测工作负载下的机械可靠性;然而,目前Fe-Co合金的疲劳数据有限。本工作通过应变控制疲劳试验和断口分析表征了锻造Fe-Co-2V的疲劳性能。杨氏模量、极限强度和屈服应力通过单调拉伸试验确定。使用完全反向的应变控制疲劳试验对疲劳行为进行量化,施加的应变幅度在0.10%-1.00%之间。随后,Coffin-Manson应变寿命曲线与实验数据相拟合。通过扫描电子显微镜的断口形貌研究了失效机理。对失效表面的检查表明,裂纹萌生发生在试样表面上或附近的缺陷处,在穿晶解理断裂之前,裂纹扩展的局部区域。此外,从实验静态和循环实验测试中校准了两个材料模型。本文提出的锻造Fe-Co-2V疲劳行为的表征将有助于Fe-Co-2V部件的疲劳分析和分析疲劳建模方法的发展。
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引用次数: 1
Impact Forming of AA5052-H32 Sheets with Friction Stir Spot Welds Using a Shock Tube and Failure Assessment 激波管搅拌摩擦点焊AA5052-H32板的冲击成形及失效评估
IF 1.2 4区 材料科学 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-02-18 DOI: 10.1115/1.4053894
S. K. Barik, Ganesh R Narayanan, N. Sahoo
In this present study, both the experimental and numerical investigations are carried out to understand the formability of 1.5 mm thick AA 5052-H32 sheets with friction stir spot weld (FSSW). A shock tube experimental facility is utilized in which a rigid hemispherical striker is propelled at a high velocity and deforms the FSSW sheets at high strain rates. In this analysis, the effect of different tool rotational speed and plunge depth on the FS spot welding outputs and forming outputs are understood. Furthermore, DEFORM-3D FE code is used to perform FE simulation of both the FS spot welding and forming of the welded sheets interactively. During FE simulation of impact forming, tensile data obtained from the unwelded section of the sheet deformed using the shock tube is fit to modified Johnson-Cook (MJC) model. In the case of the FS spot welded region, a hardness based multiplying factor is identified and used to obtain stress-strain data by fitting to MJC model. The predicted temperature evolution during the FSSW is validated with the experimental data and a good correlation has been observed. The predicted material flow phenomenon gives an insight about the joint formation during FSSW. Various forming outputs such as deformation profile, failure pattern and effective strain distribution predicted by MJC model in combination with Freudenthal damage model is compared with the experimental data and the results have a fair agreement.
本文对1.5 mm厚AA 5052-H32搅拌摩擦点焊成形性能进行了试验和数值研究。利用激波管实验装置,高速推进刚性半球形冲击器,以高应变率使FSSW片材变形。在分析中,了解了不同刀具转速和切削深度对FS点焊输出和成形输出的影响。利用DEFORM-3D有限元软件对钢板的点焊和成形过程进行了交互式的有限元模拟。在冲击成形有限元模拟中,从激波管变形的板的未焊接部分得到的拉伸数据符合修正的Johnson-Cook (MJC)模型。对于FS点焊区,确定了基于硬度的乘因子,并通过拟合MJC模型获得应力应变数据。用实验数据验证了预测的FSSW期间的温度变化,并观察到良好的相关性。预测的物质流动现象为FSSW过程中节理的形成提供了新的思路。将MJC模型与Freudenthal损伤模型相结合预测的变形轮廓、破坏模式和有效应变分布等各种成形输出与实验数据进行了比较,结果吻合较好。
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引用次数: 1
Effect of Oxygen Diffusion During the Post-Processing Of Ti6Al4V Lattice Structures Fabricated by the SLM Process 氧扩散对SLM法制备Ti6Al4V晶格结构后处理的影响
IF 1.2 4区 材料科学 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-02-16 DOI: 10.1115/1.4053870
H. Salem, Peter Ibrahim, Moataz M. Attallah, H. Salem
Post-processing of Ti6Al4V lattice structures fabricated using selective laser melting (SLM) was performed using hot isostatic pressing (HIPing) and heat treatment (HT) to mitigate the undesired effect of rapid cooling during SLM. Oxygen diffusion during post-processing had a significant influence on the microstructure and subsequently the mechanical properties of the lattices. Oxygen content analysis was conducted to confirm the oxygen diffusion through the strurts' peripheries. The effect of oxygen diffusion during the HIPing and sub-transus HT (600-800 °C) regimes on the phase transformation, failure mechanisms and mechanical properties of the lattices was investigated. Results revealed that the transformation of the originally formed α' martensite was dependent on the post-processing temperature. This transformation resulted in a decrease in yield strength. The decrease in failure strain (ductility) for all treated conditions was related to oxygen diffusion, forming near-surface α-case.
使用热等静压(HIPing)和热处理(HT)对使用选择性激光熔化(SLM)制造的Ti6Al4V晶格结构进行后处理,以减轻SLM期间快速冷却的不期望影响。后处理过程中的氧扩散对晶格的微观结构和随后的机械性能有显著影响。进行氧含量分析以确认氧通过结构外围的扩散。研究了HIPing和亚透射HT(600-800°C)过程中氧扩散对晶格相变、失效机制和力学性能的影响。结果表明,初始形成的α′马氏体的转变与后处理温度有关。这种转变导致屈服强度下降。在所有处理条件下,失效应变(延展性)的降低与氧扩散有关,形成近表面α情况。
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引用次数: 0
Influence of 650°C Thermal Ageing on Microstructure and Creep-Fatigue Behaviors of P92 Steel 650°C热时效对P92钢组织和蠕变疲劳行为的影响
IF 1.2 4区 材料科学 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-02-07 DOI: 10.1115/1.4053772
M. Jianfeng, Jianwei Zhu, Dasheng Wang, Fengping Zhong, Chen Jichang, Zhou Qiang, Bao Shiyi
In this paper, P92 steel was subjected to thermal ageing treatment at 650°C for 800h, and then basic mechanical and creep-fatigue In this paper, P92 steel was subjected to thermal ageing treatment at 650°C for 800h, and then basic mechanical and creep-fatigue test were performed. The creep-fatigue cycle response trend is consistent before and after ageing. Subsequently, microscopic observation shows that P92 steel after ageing still has typical lamellar martensite and prior austenite grains. The thermal ageing of 650°C resulted in more precipitates of martensite lath, obvious lath boundary, coarsening of martensite lath and decreased dislocation density. Furthermore, thermal ageing results in the increase of precipitates (Laves phase) and martensite width of P92 steel. The fine Laves phase located on the grain boundary can effectively nail the grain boundary, and play the role of precipitation strengthening. Besides, the Laves phase located on the dislocation has the effect of diffusion strengthening, which prevents dislocation slip and improves the creep-fatigue resistance of P92 steel. Finally, four creep-fatigue life model parameters of ageing P92 steel were obtained according to the test, including strain range partitioning (SRP), strain energy partitioning (SEP), frequency separation life model (FSL) and strain energy density exhaustion model (SEDE). The prediction results of the four models all fall within the double tolerance zone. The SPR and SEP are found to be conservative, while the FSL and SEDE are recommended herein due to their suitability of predicting creep-fatigue life of aging P92 steel.
本文对P92钢进行了650°C热老化处理800h,然后进行了基本机械和蠕变疲劳试验。老化前后蠕变疲劳循环响应趋势是一致的。随后,微观观察表明,P92钢时效后仍具有典型的片状马氏体和先前的奥氏体晶粒。650°C的热时效导致更多的马氏体板条析出,板条边界明显,马氏体板条粗化,位错密度降低。此外,热时效导致P92钢的析出相(Laves相)和马氏体宽度增加。细小的Laves相位于晶界上,可以有效地钉住晶界,起到强化沉淀的作用。此外,位于位错上的Laves相具有扩散强化作用,防止了位错滑移,提高了P92钢的蠕变疲劳抗力。最后,通过试验获得了P92钢时效蠕变疲劳寿命模型的四个参数,包括应变范围划分(SRP)、应变能划分(SEP)、频率分离寿命模型(FSL)和应变能密度耗竭模型(SEDE)。四个模型的预测结果均在双容限范围内。SPR和SEP被发现是保守的,而FSL和SEDE在本文中被推荐,因为它们适合预测老化P92钢的蠕变疲劳寿命。
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引用次数: 2
Experimental and Numerical Study of Turbine Blade Fatigue Based on a Creep-fatigue Prediction Model 基于蠕变疲劳预测模型的涡轮叶片疲劳试验与数值研究
IF 1.2 4区 材料科学 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-01-21 DOI: 10.1115/1.4053617
Debin Sun, J. Huo, Shaoxia An
To scrupulously predict the creep-fatigue life of materials, a creep life prediction model is firstly proposed in this study considering real-time creep damage derived from the Kachanov creep damage model; secondly, combined with the Chaboche fatigue damage model and the nonlinear coupling mechanism of continuous damage mechanics, a creep-fatigue life prediction model of material is ulteriorly presented in this paper; finally, the effectiveness of the creep-fatigue life model is corroborated by experiment data of DZ125, whose prediction results are in the ±2.0 dispersion zone and then the creep-fatigue life of the turbine blade is calculated to compare with the experimental results of the blade specimen to further prove the practicability, whose error is about 3.2%, which can provide a theoretical reference for the damage prediction, durability analysis, and life prediction of the turbine blade.
为了准确预测材料的蠕变疲劳寿命,本文首次提出了基于Kachanov蠕变损伤模型的实时蠕变损伤预测模型;其次,结合Chaboche疲劳损伤模型和连续损伤力学的非线性耦合机理,提出了材料蠕变疲劳寿命预测模型;最后,通过DZ125的试验数据验证了蠕变疲劳寿命模型的有效性,预测结果在±2.0的离散范围内,然后计算涡轮叶片的蠕变疲劳寿命,与叶片试件的试验结果进行对比,进一步证明了模型的实用性,误差约为3.2%,为涡轮叶片的损伤预测、耐久性分析和寿命预测提供理论参考。
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引用次数: 0
Dislocation Mechanics of Extremely High Rate Deformations in Iron and Tantalum 铁和钽中超高速率变形的位错力学
IF 1.2 4区 材料科学 Q3 ENGINEERING, MECHANICAL Pub Date : 2022-01-01 DOI: 10.1115/1.4052104
M. Shehadeh, P. Ters, R. Armstrong, W. Arnold
{"title":"Dislocation Mechanics of Extremely High Rate Deformations in Iron and Tantalum","authors":"M. Shehadeh, P. Ters, R. Armstrong, W. Arnold","doi":"10.1115/1.4052104","DOIUrl":"https://doi.org/10.1115/1.4052104","url":null,"abstract":"","PeriodicalId":15700,"journal":{"name":"Journal of Engineering Materials and Technology-transactions of The Asme","volume":"308 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76340738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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