Journal of Multiscale Modelling最新文献_第6页

Prediction of Reheat Cracking Behavior in a Service Exposed 316H Steam Header 316H蒸汽集箱再热开裂行为预测

IF 1.5

Journal of Multiscale Modelling Pub Date : 2020-11-20 DOI: 10.1142/s1756973720500092

Haoliang Zhou, A. Mehmanparast, K. Nikbin

{"title":"Prediction of Reheat Cracking Behavior in a Service Exposed 316H Steam Header","authors":"Haoliang Zhou, A. Mehmanparast, K. Nikbin","doi":"10.1142/s1756973720500092","DOIUrl":"https://doi.org/10.1142/s1756973720500092","url":null,"abstract":"Reheat cracking in an ex-service Type 316H stainless steel steam header component has been investigated in this study. The examined steam header was in service for 87,790[Formula: see text]h and the cracks in this component were found in the vicinity of the weld toe. The root cause of this type of failure was due to the welding residual stresses. The welding-induced residual stresses had been present in the header at the early stage of the operation and were released during service. In this paper, a novel technique has been proposed to simulate the residual stress distribution normal to the crack direction by applying remote fixed displacement boundary conditions in an axisymmetric model. This approach can simulate the presence of residual stresses in actual components without the need to develop full weld simulation to quantify them. The predicted residual stress levels and distributions normal to the crack direction have been found in good agreement with the measured residual stresses available in the literature for a similar header. The creep crack growth (CCG) rates have been characterized using the fracture mechanics [Formula: see text] parameter and estimated using predictive models.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45030766","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

Computational Homogenization of Heterogeneous Materials by a Novel Hybrid Numerical Scheme 用一种新的混合数值格式计算非均质材料的均匀化

IF 1.5

Journal of Multiscale Modelling Pub Date : 2020-11-02 DOI: 10.1142/s1756973720500080

M. Cascio, M. Grifò, A. Milazzo, I. Benedetti

{"title":"Computational Homogenization of Heterogeneous Materials by a Novel Hybrid Numerical Scheme","authors":"M. Cascio, M. Grifò, A. Milazzo, I. Benedetti","doi":"10.1142/s1756973720500080","DOIUrl":"https://doi.org/10.1142/s1756973720500080","url":null,"abstract":"The Virtual Element Method (VEM) is a recent numerical technique capable of dealing with very general polygonal and polyhedral mesh elements, including irregular or non-convex ones. Because of this feature, the VEM ensures noticeable simplification in the data preparation stage of the analysis, especially for problems whose analysis domain features complex geometries, as in the case of computational micro-mechanics problems. The Boundary Element Method (BEM) is a well known, extensively used and effective numerical technique for the solution of several classes of problems in science and engineering. Due to its underlying formulation, the BEM allows reducing the dimensionality of the problem, resulting in substantial simplification of the pre-processing stage and in the reduction of the computational effort, without jeopardizing the solution accuracy. In this contribution, we explore the possibility of a coupling VEM and BEM for computational homogenization of heterogeneous materials with complex microstructures. The test morphologies consist of unit cells with irregularly shaped inclusions, representative e.g., of a fiber-reinforced polymer composite. The BEM is used to model the inclusions, while the VEM is used to model the surrounding matrix material. Benchmark finite element solutions are used to validate the analysis results.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48628850","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

Reactive Additive Manufacturing Simulation of Thermoset Nano Graphene Inclusion 热固性纳米石墨烯包合物的反应增材制造模拟

IF 1.5

Journal of Multiscale Modelling Pub Date : 2020-09-01 DOI: 10.1142/s1756973720500043

F. Abdi, H. Baid, N. Moazami, J. Batten, Dade Huang, Amirhossein Eftekharian, R. Hajiha, K. Nikbin

引用次数: 2

Analytical Study for Fractional Order Mathematical Model of Concentration of Ca2+ in Astrocytes Cell with a Composite Fractional Derivative 星形胶质细胞Ca2+浓度分数阶数学模型的复合分数阶导数分析研究

IF 1.5

Journal of Multiscale Modelling Pub Date : 2020-09-01 DOI: 10.1142/s1756973720500055

Vinod Gill, Yudhveer Singh, Devendra Kumar, Jagdev Singh

引用次数: 5

Design and Analysis of Composite Window Frame for a Regional Aircraft 某支线飞机复合材料窗框的设计与分析

IF 1.5

Journal of Multiscale Modelling Pub Date : 2020-08-24 DOI: 10.1142/s1756973720500067

J. A. Lopes, O. Bacarreza, Z. S. Khodaei

引用次数: 0

Elucidating the Effect of Bimodal Grain Size Distribution on Plasticity and Fracture Behavior of Polycrystalline Materials 双峰型晶粒尺寸分布对多晶材料塑性和断裂行为的影响

IF 1.5

Journal of Multiscale Modelling Pub Date : 2020-08-24 DOI: 10.1142/s1756973720500079

F. Barbe, I. Benedetti, V. Gulizzi, M. Calvat, C. Keller

{"title":"Elucidating the Effect of Bimodal Grain Size Distribution on Plasticity and Fracture Behavior of Polycrystalline Materials","authors":"F. Barbe, I. Benedetti, V. Gulizzi, M. Calvat, C. Keller","doi":"10.1142/s1756973720500079","DOIUrl":"https://doi.org/10.1142/s1756973720500079","url":null,"abstract":"The refinement of grains in a polycrystalline material leads to an increase in strength but as a counterpart to a decrease in elongation to fracture. Different routes are proposed in the literature to try to overpass this strength-ductility dilemma, based on the combination of grains with highly contrasted sizes. In the simplest concept, coarse grains are used to provide relaxation locations for the highly stressed fine grains. In this work, a model bimodal polycrystalline system with a single coarse grain embedded in a matrix of fine grains is considered. Numerical full-field micro-mechanical analyses are performed to characterize the impact of this coarse grain on the stress-strain constitutive behavior of the polycrystal: the effect on plasticity is assessed by means of crystal plasticity finite element modeling [B. Flipon, C. Keller, L. Garcia de la Cruz, E. Hug and F. Barbe, Tensile properties of spark plasma sintered AISI 316L stainless steel with unimodal and bimodal grain size distributions, Mater. Sci. Eng. A 729 (2018) 248–256] while the effect on intergranular fracture behavior is studied by using boundary element modeling [I. Benedetti and V. Gulizzi, A grain-scale model for high-cycle fatigue degradation in polycrystalline materials, Int. J. Fract. 116 (2018) 90–105]. The analysis of the computational results, compared to the experimentally characterized tensile properties of a bimodal 316L stainless steel, suggests that the elasto-plastic interactions taking place prior to micro-cracking may play an important role in the mechanics of fracture of this steel.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41999656","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

Approximation of Calcium Diffusion in Alzheimeric Cell 钙在阿尔茨海默氏症细胞中扩散的近似

IF 1.5

Journal of Multiscale Modelling Pub Date : 2020-06-01 DOI: 10.1142/s1756973720500018

B. Jha, Devanshi D. Dave

引用次数: 8

Influence of Moving Heat Source on Skin Tissue in the Context of Two-Temperature Caputo–Fabrizio Heat Transport Law 基于双温卡普托-法布里齐奥热传递定律的移动热源对皮肤组织的影响

IF 1.5

Journal of Multiscale Modelling Pub Date : 2020-06-01 DOI: 10.1142/s175697372050002x

A. Sur, S. Mondal, M. Kanoria

引用次数: 20

Study on the Effect of Doping on Lattice Constant and Electronic Structure of Bulk AuCu by the Density Functional Theory 用密度泛函理论研究掺杂对块状AuCu晶格常数和电子结构的影响

IF 1.5

Journal of Multiscale Modelling Pub Date : 2020-06-01 DOI: 10.1142/s1756973720300014

Dung Nguyen-Trong, Cuong Nguyen-Chinh, Van Duong-Quoc

引用次数: 20

Refinement of the Maxwell Formula for Fiber-Reinforced Composites 纤维增强复合材料麦克斯韦公式的改进

IF 1.5

Journal of Multiscale Modelling Pub Date : 2020-03-01 DOI: 10.1142/S175697371950001X

A. Kalamkarov, I. Andrianov, G. Starushenko

{"title":"Refinement of the Maxwell Formula for Fiber-Reinforced Composites","authors":"A. Kalamkarov, I. Andrianov, G. Starushenko","doi":"10.1142/S175697371950001X","DOIUrl":"https://doi.org/10.1142/S175697371950001X","url":null,"abstract":"The effective properties of the fiber-reinforced composite materials with fibers of square cross-section are investigated. The novel formula for the effective coefficient of thermal conductivity refining the classical Maxwell formula (MF) is derived. The methods of asymptotic homogenization, boundary shape perturbation and Schwarz alternating process are applied. It is shown that the principal term of the asymptotic expansion of the refined formula in powers of small size of inclusions coincides with the classical MF. The corrections to the MF are obtained for different values of geometrical and physical properties of the constituents of the composite material. The analytical and numerical analyses are carried out and illustrated graphically. In particular, the derived refined formula and the MF are compared for the limiting values of the geometric dimensions and physical properties of the composite. It is shown that the refined formula is applicable for the inclusions with any conductivity in the entire range of the geometric sizes of inclusions, including the limiting cases of inclusions with zero thermal conductivity and maximally large inclusions.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S175697371950001X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44994788","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