Journal of Multiscale Modelling最新文献_第9页

The Elastic Contact of Rough Spheres Investigated Using a Deterministic Multi-Asperity Model 用确定性多粗糙度模型研究粗糙球的弹性接触

IF 1.5

Journal of Multiscale Modelling Pub Date : 2018-11-05 DOI: 10.1142/S1756973718410020

V. Yastrebov

{"title":"The Elastic Contact of Rough Spheres Investigated Using a Deterministic Multi-Asperity Model","authors":"V. Yastrebov","doi":"10.1142/S1756973718410020","DOIUrl":"https://doi.org/10.1142/S1756973718410020","url":null,"abstract":"In this paper, we use a deterministic multi-asperity model to investigate the elastic contact of rough spheres. Synthetic rough surfaces with controllable spectra were used to identify individual asperities, their locations and curvatures. The deterministic analysis enables to capture both particular deformation modes of individual rough surfaces and also statistical deformation regimes, which involve averaging over a big number of roughness realizations. Two regimes of contact area growth were identified: the Hertzian regime at light loads at the scale of a single asperity, and the linear regime at higher loads involving multiple contacting asperities. The transition between the regimes occurs at the load which depends on the second and the fourth spectral moments. It is shown that at light indentation the radius of circumference delimiting the contact area is always considerably larger than Hertzian contact radius. Therefore, it suggests that there is no scale separation in contact problems at light loads. In particular, the geometrical shape cannot be considered separately from the surface roughness at least for approaching greater than one standard roughness deviation.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":"58 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718410020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41296005","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

Modeling Avascular Tumor Growth: Approach with an Adaptive Grid Numerical Technique 血管性肿瘤生长模型的自适应网格数值方法

IF 1.5

Journal of Multiscale Modelling Pub Date : 2018-09-01 DOI: 10.1142/S1756973718400024

A. Amoddeo

{"title":"Modeling Avascular Tumor Growth: Approach with an Adaptive Grid Numerical Technique","authors":"A. Amoddeo","doi":"10.1142/S1756973718400024","DOIUrl":"https://doi.org/10.1142/S1756973718400024","url":null,"abstract":"The mathematical modeling of complex biological systems leads to system of coupled nonlinear partial differential equations (PDEs). In this paper, we present a short review on the interaction of the urokinase plasminogen activator (uPA) system with a model for cancer cell in the avascular phase, faced using the moving mesh PDE/(MMPDE) numerical technique. The dynamical evolution of the system as a function of the diffusion properties of cancer cells has been considered, as well as the effect of hypoxia to the cancer evolution, introducing a model equation for the nutrient oxygen. The model parameters have been taken from the data existing in the literature, in particular to gauge the oxygen supply, data determined from in vivo experiments on human tumors have been used. The numerical results obtained simulating a one-dimensional portion of the biological tissue are consistent with the data existing in the literature. Our high-resolution computations show that cancer proliferation begins through highly irregular spatio-temporal pattern, which depends on cancer motility characteristics. In presence of hypoxia, the cancer proliferation patterns are still characterized by an inhomogeneous pattern, but other effects are present which depend on the model parameters, triggered by the oxygen.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718400024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47869547","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: 4

A Multiscale Approximation Method to Describe Diatomic Crystalline Systems: Constitutive Equations 描述双原子结晶系统的一种多尺度近似方法：本构方程

IF 1.5

Journal of Multiscale Modelling Pub Date : 2018-09-01 DOI: 10.1142/S1756973718400012

P. Giovine

引用次数: 2

A Continuum-Discrete Multiscale Model for In-Plane Mechanical Modeling of Masonry Panels 砌体面板平面内力学建模的连续体离散多尺度模型

IF 1.5

Journal of Multiscale Modelling Pub Date : 2018-09-01 DOI: 10.1142/S1756973718400048

L. Salvatori, P. Spinelli

{"title":"A Continuum-Discrete Multiscale Model for In-Plane Mechanical Modeling of Masonry Panels","authors":"L. Salvatori, P. Spinelli","doi":"10.1142/S1756973718400048","DOIUrl":"https://doi.org/10.1142/S1756973718400048","url":null,"abstract":"A multiscale numerical model for the in-plane mechanical behavior of masonry panels is presented. At the microscale, masonry is modeled by rigid blocks interacting through plane, deformable interfaces. These may represent actual mortar joints or virtual preferential fracture surfaces of the blocks (e.g., vertical surfaces crossing a block and connecting vertical joints in the brick rows above and below the considered one). Damage parameters control the interface transitions from a cohesive linear-elastic phase to an elastic-plastic one (modeling frictional sliding and contact) and, eventually, to a completely damaged one. At the panel scale, the material is treated as a finite-element discretized Cauchy continuum, homogenizing the periodic microstructure. The model allows reproducing the main anisotropic nonlinear behaviors of masonry by finite element simulations at a reasonable computational cost. With respect to more traditional phenomenological continuum nonlinear models, a more direct use of experimental data for the quantification of the model parameters is possible. Moreover, these parameters are fewer in number, since part of the complexity of the material is represented by the explicitly modeled microstructural geometry.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718400048","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47631004","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

Multiscale Damage Modeling on Aeronautical Composite Under Low Energy Impact 低能冲击下航空复合材料多尺度损伤模型研究

IF 1.5

Journal of Multiscale Modelling Pub Date : 2018-09-01 DOI: 10.1142/S1756973718400036

M. Buonsanti

{"title":"Multiscale Damage Modeling on Aeronautical Composite Under Low Energy Impact","authors":"M. Buonsanti","doi":"10.1142/S1756973718400036","DOIUrl":"https://doi.org/10.1142/S1756973718400036","url":null,"abstract":"The purpose in this paper is to investigate about the behavior of aeronautics composite material subjected to a low energy impact. Low velocity impact in aircraft composite panels is a matter of concern in modern aircraft and can be used either from maintenance accidents tools or in-flight impact with debris. The proposed study considers the dynamics of impact between a small piece of granular material and a large body of composite material. The principal aim is to simulate the impact of runway debris throw-up by the landing gear against an airplane structure. In this simulation, I want to investigate on CFRP composite panels affected by granular particles at low speed in theoretical and experimental tests. The finite element analysis, initially on the macroscale and subsequently on the microscale, shows the damage inside the composite according to the experimental results, but by itself, this classic numerical approach is little suitable to investigate the complete phenomenon. Developing the question, in first step by the classical approach, appears difficult on macro and microscale relationship besides their reciprocal influence over the deformation field. To resolve the last question, I will perform the first step on macroscale FEM analysis and then reduce from the size and effects over an opportune created RVE, such that microscale main effects as local delamination can be reproduced.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S1756973718400036","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41684564","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

Preface 前言

IF 1.5

Journal of Multiscale Modelling Pub Date : 2018-09-01 DOI: 10.1142/s1756973718020018

P. Giovine

引用次数: 0

Analysis of Fatigue Crack Growth Rate Data in an Aircraft 7175-T7351 Al-Alloy Generated at Different Accredited Laboratories with Probability Life Assessment Example 不同认可实验室7175-T7351铝合金疲劳裂纹扩展速率数据分析及概率寿命评估实例

IF 1.5

Journal of Multiscale Modelling Pub Date : 2018-03-22 DOI: 10.1142/S175697371850004X

I. Černý

{"title":"Analysis of Fatigue Crack Growth Rate Data in an Aircraft 7175-T7351 Al-Alloy Generated at Different Accredited Laboratories with Probability Life Assessment Example","authors":"I. Černý","doi":"10.1142/S175697371850004X","DOIUrl":"https://doi.org/10.1142/S175697371850004X","url":null,"abstract":"Estimation of safety and reliability of engineering structures and components containing cracks or crack-like defects is one of the most important application field of fracture mechanics particularly in components, where limited defects can be accepted. Such design philosophy is usually called “damage tolerance”, formerly “safe life”. In such cases, safety and reliability of further operation, residual life assessment and specification of interval of damage development inspections are important issues. Existing exact knowledge on fatigue crack growth (FCG) parameters is an essential condition. Results of FCG measurement in an Al 7175-T7351 alloy of a particularly high homogeneity, carried out as a part of the Proficiency Test Program organized by Exova in France are presented in this work. Results were evaluated in terms of parameters C and m of the Paris dependence in the stable growth region. To pass the test program successfully, a particular attention was paid to improve and verify direct current potential drop (DCPD) method being used for the crack length measurement. In the paper, the results of the FCG measurements generated by different participating laboratories were analyzed. A distinct correlation between C and m values, so called “coupling”, was found and demonstrated. Some paradoxes of the assessment of laboratories were addressed, namely the fact that a laboratory assessed as unacceptable concerning one of the parameters generated much more accurate and useful data than another laboratory with a better assessment. Eventually, the results including their scatter were used to provide an example of probabilistic assessment of a simple beam residual life to show practical actual impacts of the scatter on the life assessment.","PeriodicalId":43242,"journal":{"name":"Journal of Multiscale Modelling","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2018-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1142/S175697371850004X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47075358","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

Theory of a Time Domain Boundary Element Development for the Dynamic Analysis of Coupled Multiphase Porous Media 耦合多相多孔介质动力学分析的时域边界元发展理论

IF 1.5

Journal of Multiscale Modelling Pub Date : 2017-12-28 DOI: 10.1142/S175697371750007X

P. Maghoul, B. Gatmiri

引用次数: 3

Boundary Element Crystal Plasticity Method 边界元晶体塑性法

IF 1.5

Journal of Multiscale Modelling Pub Date : 2017-12-28 DOI: 10.1142/S1756973717400030

I. Benedetti, V. Gulizzi, V. Mallardo

引用次数: 3

Multiscale Analysis of Structures Composed of Metal Matrix Composites Considering Phase Debonding 考虑相脱粘的金属基复合材料结构多尺度分析