Applied and Computational Mechanics最新文献_第8页

Size dependent nano-spherical pressure vessels based on strain gradient theory 基于应变梯度理论的尺寸相关纳米球形压力容器

Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22059/JCAMECH.2021.322571.612

E. Zarezadeh, M. Najafzadeh, A. Barati

{"title":"Size dependent nano-spherical pressure vessels based on strain gradient theory","authors":"E. Zarezadeh, M. Najafzadeh, A. Barati","doi":"10.22059/JCAMECH.2021.322571.612","DOIUrl":"https://doi.org/10.22059/JCAMECH.2021.322571.612","url":null,"abstract":"This study investigates the effect of size scale material parameters on stress distribution and radial displacement of nanosphere based on strain gradient theory. This model is more capable of studying mechanical behavior than classical elasticity theory as the size scale effect of the nanosphere is also considered. Minimum total potential energy is used to derive governing differential equation of nanosphere under internal hydrostatic pressure. Using the efficient numerical generalized differential quadrature (GDQ) method, the governing equation and corresponding boundary conditions are solved. The classical elasticity equation is obtained by setting the value of size scale material parameters to zero. With the comparison of these theories, the importance of the size scale material parameters is achieved. It is found that the radial displacement of nanosphere predicted by strain gradient theory is less than those predicted by classical elasticity theory but comparing the distribution of stress components along radius is more complex. The effect of the size of the nanosphere on the radial stress components is also studied. With an increasing outer radius of the nanosphere, the mechanical behavior predicted by strain gradient theory tends toward those in classical elasticity theory.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43475853","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

A new calculation method for the temperature of the components of composite slabs under fire 本文提出了一种复合板构件在火灾作用下的温度计算新方法

Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22059/JCAMECH.2021.316216.584

P. Piloto, Carlos Balsa, F. Ribeiro, R. Rigobello

引用次数: 2

A Generalized Identification of Joint Structural State and Unknown Inputs Using Data Fusion MKF-UI 基于数据融合的关节结构状态和未知输入的广义识别

Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22055/JACM.2021.32600.2043

Lijun Liu, Jiajia Zhu, Y. Lei

引用次数: 2

Long-span Suspension Bridge Flutter Analysis with Drag Force Effects 考虑阻力作用的大跨度悬索桥颤振分析

Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22055/JACM.2021.32481.2025

G. Piana, A. Carpinteri

引用次数: 1

Numerical Investigations of Two-Phase Flow on a Stepped Spillway under Various Conditions 不同条件下梯级溢洪道两相流数值研究

Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22059/JCAMECH.2021.314069.573

E. Parhizgar, Z. Namazian

引用次数: 0

A two-phase hybrid product design algorithm using learning vector quantization, design of experiments, and adaptive neuro-fuzzy interface systems to optimize geometric form in view of customers’ opinions 一种基于学习向量量化、实验设计和自适应神经模糊接口系统的两阶段混合产品设计算法，根据客户意见优化几何形状

Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22059/JCAMECH.2020.300080.495

Hamid Haghshenas Gorgani, Ehsan Partovi, Mohammad Ali Soleimanpour, M. Abtahi, A. J. Pak

{"title":"A two-phase hybrid product design algorithm using learning vector quantization, design of experiments, and adaptive neuro-fuzzy interface systems to optimize geometric form in view of customers’ opinions","authors":"Hamid Haghshenas Gorgani, Ehsan Partovi, Mohammad Ali Soleimanpour, M. Abtahi, A. J. Pak","doi":"10.22059/JCAMECH.2020.300080.495","DOIUrl":"https://doi.org/10.22059/JCAMECH.2020.300080.495","url":null,"abstract":"One of the most important characteristics of a modern product is the extent to which it meets the needs of customers to gain market share. The conceptual design methods of products based on customer requirements are often feature-based, in which several features are identified between different types of a product. According to customer demands, these features are tuned and the closest is selected as the optimum. The great variety of features of a present-day product can often make this difficult because finding these common features is very complicated or even impossible. To solve this problem, choosing the optimal design is divided into two phases: In the first phase, the main product is divided into some basic categories and according to the customers' opinion, one is selected as the \"winning category\". In the second phase, the selection of common geometrical features between the members of the winning category is made. Then, the optimization process is done based on customer rating and the closest design to the mentioned rating is selected. The house light switch is used as a case study and the proposed algorithm is implemented on it. High customer satisfaction with the optimized final design, high response rate to survey forms, and the low number of incompatible data, all, indicate the suitability of the proposed algorithm with human interface characteristics, simplicity and efficiency in adapting the product to the customers' view. This method can be used for other industrial products and even for non-industrial products or services.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44864443","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

Free vibration analysis of the cracked post-buckled axially functionally graded beam under compressive load 受压荷载作用下开裂后屈曲轴向功能梯度梁的自由振动分析

Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22059/JCAMECH.2021.320044.602

Emadaldin Sh Khoram-Nejad, S. Moradi, M. Shishesaz

引用次数: 4

Effects of Annulus Geometry and Liquid Properties on the Well Conditions during UBD Operation 环空几何形状和液体性质对欠平衡钻井过程中井况的影响

Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22059/JCAMECH.2021.315459.578

S. Ghobadpouri, I. Zamani, A. F. Jozaei

{"title":"Effects of Annulus Geometry and Liquid Properties on the Well Conditions during UBD Operation","authors":"S. Ghobadpouri, I. Zamani, A. F. Jozaei","doi":"10.22059/JCAMECH.2021.315459.578","DOIUrl":"https://doi.org/10.22059/JCAMECH.2021.315459.578","url":null,"abstract":"Well conditions during drilling operation can be predicted using numerical simulation. During under-balanced drilling (UBD) operation, controlling the bottom-hole pressure (BHP) in a suitable range and also appropriate hole-cleaning is essential. In this paper, numerical simulation of gas-liquid-solid three-phase flow in the annulus is used to study the effects of annulus geometry and also liquid properties on the BHP and hole-cleaning during UBD operation. To validate the numerical simulation, the results are compared with the experimental data from a laboratory study. Also, the gain results from developed code are compared with the actual field data from a real well, several mechanistic models from WellFlo software, and gas- liquid two- fluid numerical simulation. Due to the significance of controlling the BHP and hole-cleaning during UBD operation, the effects of annulus geometry and liquid phase properties on BHP and the solid volume fraction distribution are investigated. According to the results, changing the hydraulic diameter and cross-sectional area of the annulus can affect BHP and hole- cleaning in UBD operation. In other words, increasing the hydraulic diameter at a constant cross- sectional area improves hole-cleaning and decrease BHP. Also, decreasing the cross-sectional area at a constant hydraulic diameter improves hole-cleaning and increase BHP. The results show that the liquid viscosity affects hole-cleaning through two contrary mechanisms. In fact, by increasing the liquid viscosity, carrying capacity of the liquid phase is increased and cutting transfer velocity is decreased.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48410710","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

Replacing friction model with interaction between particles in analyzing orthogonal and rotational cutting processes using SPH method 用SPH法分析正交切削和旋转切削过程中颗粒间相互作用代替摩擦模型

Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22059/JCAMECH.2019.280356.390

M. Dehghani, A. Shafiei

{"title":"Replacing friction model with interaction between particles in analyzing orthogonal and rotational cutting processes using SPH method","authors":"M. Dehghani, A. Shafiei","doi":"10.22059/JCAMECH.2019.280356.390","DOIUrl":"https://doi.org/10.22059/JCAMECH.2019.280356.390","url":null,"abstract":"The cutting tool and work-piece of cutting process are commonly analyzed using Finite Element (FE) and Smooth-Particle Hydrodynamics (SPH) methods respectively. This is identified a compound method in this research. The interaction between cutting tool elements and work-piece particles are modeled as pressure and friction force. The coefficient of friction (CF) between cutting tool and work-piece is the fundamental parameter of friction model. The CF effects on chip morphology and cutting force. In present study, both cutting tool and work-piece of cutting process are analyzed using SPH method without Friction and pressure model (SPH.NO.F). Therefore the pressure and friction force between elements and particles in compound method are replaced with the interaction between particles. The friction in the cutting zones is a physical process that accompanies the cutting but this is not modeled in analyzing of this process, because the cutting tool and work-piece particles interact with each other using the mass and momentum conservation equation. The results of orthogonal cutting process show the chip morphology of SPH.NO.F method is the same as compound method with friction model by CF=0 and 0.17. The cutting force of SPH.NO.F method is coincided to experimental results. The cutting force of milling process is investigated using SPH.NO.F and compound method by CF=0 and 0.17.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44782456","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

Influence of load-level and effective thickness on the fire resistance of composite slabs with steel deck 荷载水平和有效厚度对钢板组合楼板耐火性能的影响

Applied and Computational Mechanics Pub Date : 2021-06-01 DOI: 10.22059/JCAMECH.2021.316155.583

L. Santos, P. Piloto, Carlos Balsa, Erica A. Kimura

{"title":"Influence of load-level and effective thickness on the fire resistance of composite slabs with steel deck","authors":"L. Santos, P. Piloto, Carlos Balsa, Erica A. Kimura","doi":"10.22059/JCAMECH.2021.316155.583","DOIUrl":"https://doi.org/10.22059/JCAMECH.2021.316155.583","url":null,"abstract":"Composite slabs with steel deck have been used on building construction due to its fast-and-easy crafting that brings economic outstanding alternatives to architects and engineers on large-scale steel framed constructions. At room temperatures and in Europe, the designing procedures of composite slabs are defined by Eurocode 1994-1-1. When it comes to the fire safety analysis of these elements, the designing procedure requires more attention due to the direct exposition of the steel deck to fire, affecting the overall bending resistance. This importance is presented in Eurocode 1994-1-2, taking in consideration the integrity, insulation and load-bearing criteria. In this work the thermal and mechanical behaviour of composite slabs with steel deck exposed to standard fire ISO 834 are studied through numerical simulations using Finite-Element Method (FEM). The model was previously validated with one experimental test from literature. The ANSYS Mechanical APDL software was used to develop a parametric study, simulating four different geometries with different load levels, comprehending a total of 126 thermal and mechanical simulations used to determine the correlation between load-level and fire resistance. As result, a new simplified method is proposed for the load bearing fire resistance of composite slabs, considering the effect of the effective thickness and the load level. The fire resistance decreases with the load level and increases with the thickness of the concrete. A new proposal is presented to determine the fire resistance, based on these two parameters.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48887207","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