Applications in engineering science最新文献_第7页

Analysis and modeling of the strain distribution and evolution during a fatigue test in ULCF and LCF on a friction stir welded specimen from steel and aluminum 钢铝搅拌摩擦焊接试样的ULCF和LCF疲劳试验应变分布及演化分析与建模

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100131

Paul Dario Toasa Caiza , Yoshihiko Uematsu

引用次数: 0

A new class of Finitely Extensible Nonlinear Elastic FENE-P model obtained with a thermodynamical approach and the use of compressible natural configurations. Part I: Isothermal deformations 利用热力学方法和可压缩的自然构形，得到了一类新的有限可扩展非线性弹性FENE-P模型。第一部分:等温变形

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100138

Juan Pablo Gomez-Constante, Liviu Iulian Palade

引用次数: 1

Implementation of nonlinear computing models and classical regression for predicting compressive strength of high-performance concrete 高性能混凝土抗压强度非线性计算模型与经典回归预测的实现

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100133

M.M Jibril , M.A Zayyan , Salim Idris Malami , A.G. Usman , Babatunde A. Salami , Abdulazeez Rotimi , S.I. Abba

{"title":"Implementation of nonlinear computing models and classical regression for predicting compressive strength of high-performance concrete","authors":"M.M Jibril , M.A Zayyan , Salim Idris Malami , A.G. Usman , Babatunde A. Salami , Abdulazeez Rotimi , S.I. Abba","doi":"10.1016/j.apples.2023.100133","DOIUrl":"10.1016/j.apples.2023.100133","url":null,"abstract":"<div><p>The construction sector would greatly benefit from a strategy for optimizing high-performance concrete mixtures. However, traditional proportioning techniques are insufficient because of their high prices, usage restrictions, and inability to account for nonlinear interactions between components and concrete qualities. High-performance concrete (HPC) is a complicated composite material with highly nonlinear mechanical behaviour. When strength can be accurately predicted, design costs, design time, and material waste caused by several mixing trials can all be reduced. In this research, feed-forward neural network (FFNN), Elman neural network (ENN), support vector machine (SVM) and multilinear regression (MLR) were employed for predicting the compressive strength of HPC. The input variables include cement (C), cement strength (CeS), superplasticizer (S), fly ash (F), air entraining agent (A), coarse aggregate (CA), Sand (Sd) and water/binder (W/B) and 28 days’ compressive strength as the output variables. Finally, the results indicate that the proposed model has predictive robustness for predicting the compressive strength of HPC. The results showed that FFNN-M4, ENN-M4, SVM-M4, and MLR-M4 combination have the highest performance evaluation criteria of R<sup>2</sup>=0.9950, R<sup>2</sup>=0.9853, R<sup>2</sup>=0.9736, R<sup>2</sup>= 0.9678 in the testing phase respectively. The outcomes also show that the proposed model has high accuracy and effectiveness in predicting the compressive strength of HPC.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100133"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48248200","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

Introduction to advances in cardiovascular science 心血管科学进展导论。

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100132

K.R. Rajagopal, Keshava Rajagopal

引用次数: 0

Modeling polarization switching response of ferroelectric ceramics based on multiple natural configuration theory 基于多重自然组态理论的铁电陶瓷极化开关响应建模

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100139

Ruyue Song, Anastasia Muliana

{"title":"Modeling polarization switching response of ferroelectric ceramics based on multiple natural configuration theory","authors":"Ruyue Song, Anastasia Muliana","doi":"10.1016/j.apples.2023.100139","DOIUrl":"https://doi.org/10.1016/j.apples.2023.100139","url":null,"abstract":"<div><p>Ferroelectric ceramics experience polarization switching, which is macroscopically shown by nonlinear hysteretic responses when subjected to high compressive stresses and/or high amplitude of the electric field. We model the nonlinear hysteretic response of ferroelectric ceramics by considering evolutions of microstructural changes associated with changes in the dipole orientations due to both electrical and mechanical stimuli. We adopt the theory of multiple natural configurations, associated with multiple stress-free and electric-field-free states, in incorporating the effect of microstructural changes on describing the nonlinear electro-mechanical hysteretic response of ferroelectric ceramics. The first stress-free and electric-field-free states are associated with the original microstructure of the materials, in which the dipoles in the ferroelectric ceramics are randomly oriented. The new configurations are formed when the ferroelectric ceramics are subjected to relatively large stimuli, which align the dipole orientations. As each configuration is associated with a specific microstructure (a state of dipole orientations), mechanical and electrical properties characterized at different configurations will be different. To examine the model, experimental data on PZT (lead zirconate titanate) ceramics under electric and stress fields, available in the literature, are used. The model is capable of describing the hysteretic response in PZT under electro-mechanical stimuli.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100139"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50182920","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

Fatigue life prognosis of an oil well drill string using cascaded dynamic models 应用级联动力学模型预测油井钻柱疲劳寿命

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100142

Mihiran Galagedarage Don, Geoff Rideout

{"title":"Fatigue life prognosis of an oil well drill string using cascaded dynamic models","authors":"Mihiran Galagedarage Don, Geoff Rideout","doi":"10.1016/j.apples.2023.100142","DOIUrl":"10.1016/j.apples.2023.100142","url":null,"abstract":"<div><p>Early estimation of the fatigue life of an oil well drill string reduces the risk associated with drill string fatigue failures. In this study, a low-order computationally efficient bond graph model of a vertical well drill string and a component-level higher-order finite element model of a drill pipe threaded connection are employed to predict the fatigue damage of a given drill pipe. The bond graph is a 3D lumped segment model developed using the Newton–Euler formulation and body fixed coordinates. It is parameterized using finite element modelling simulations. The stress history from the top-level model is applied to the component-level model that contains details such as threaded geometry. Then, a multi-axial, non-proportional, and variable amplitude (MNV) fatigue estimation is performed using an open-source finite element analysis code. The fatigue prognosis approach is then demonstrated in a drill string design case study that optimizes the placement of vibration stabilizers in the wellbore to avoid severe vibrations while minimizing fatigue damage. Optimal placement of stabilizers predicts a 200% increase in fatigue life of the most vulnerable component with reference to the worst-case scenario.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100142"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46830380","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

Innovalve transcatheter mitral valve replacement system: Short-term pre-clinical study in pigs Innovalve经导管二尖瓣置换术:猪的短期临床前研究

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100144

Avi Avner , Nicolas Borenstein , Boris Orlov , Ehud Raanani

{"title":"Innovalve transcatheter mitral valve replacement system: Short-term pre-clinical study in pigs","authors":"Avi Avner , Nicolas Borenstein , Boris Orlov , Ehud Raanani","doi":"10.1016/j.apples.2023.100144","DOIUrl":"10.1016/j.apples.2023.100144","url":null,"abstract":"<div><p>Innovalve is a transcatheter mitral valve replacement (TMVR) system with a unique fixation system that aims to grasp the chordae in a rotational maneuver.</p></div><div><h3>Objectives</h3><p>This study will examine the safety and efficacy of the transapical mitral implantation of Innovalve bioprosthesis in the porcine model.</p></div><div><h3>Methods</h3><p>Innovalve MV bioprosthesis was implanted in the porcine model (5 pigs) for a duration of 30 days.</p></div><div><h3>Results</h3><p>The Innovalve bioprosthesis was successfully implanted in all of the animals with accurate positioning, anchoring and good paravalvular sealing. At 30 days after implantation, all animals exhibited normal clinical status without evidence of cardiac impairment. The prosthetic valve seemed adequately adhered to the mitral annulus with fibrous tissue.</p></div><div><h3>Conclusion</h3><p>We have demonstrated that the implantation of the Innovalve in healthy porcine subjects is feasible and safe and that the valve function and interaction with normal biological tissue is favorable and predictable.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100144"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46190990","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

On flow of power-law fluids between adjacent surfaces: Why is it possible to derive a Reynolds-type equation for pressure-driven flow, but not for shear-driven flow? 幂律流体在相邻表面之间的流动:为什么可以推导出压力驱动流动的雷诺方程，而不能推导出剪切驱动流动的雷诺方程?

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100145

Andreas Almqvist , Evgeniya Burtseva , Kumbakonam Rajagopal , Peter Wall

{"title":"On flow of power-law fluids between adjacent surfaces: Why is it possible to derive a Reynolds-type equation for pressure-driven flow, but not for shear-driven flow?","authors":"Andreas Almqvist , Evgeniya Burtseva , Kumbakonam Rajagopal , Peter Wall","doi":"10.1016/j.apples.2023.100145","DOIUrl":"10.1016/j.apples.2023.100145","url":null,"abstract":"<div><p>Flows of incompressible Navier–Stokes (Newtonian) fluids between adjacent surfaces are encountered in numerous practical applications, such as seal leakage and bearing lubrication. In seals, the flow is primarily pressure-driven, whereas, in bearings, the dominating driving force is due to shear. The governing Navier–Stokes system of equations can be significantly simplified due to the small distance between the surfaces compared to their size. From the simplified system, it is possible to derive a single lower-dimensional equation, known as the Reynolds equation, which describes the pressure field. Once the pressure field is computed, it can be used to determine the velocity field. This computational algorithm is much simpler to implement than a direct numerical solution of the Navier–Stokes equations and is therefore widely employed by engineers. The primary objective of this article is to investigate the possibility of deriving a type of Reynolds equation also for non-Newtonian fluids, using the balance of linear momentum. By considering power-law fluids we demonstrate that it is not possible for shear-driven flows, whereas it is feasible for pressure-driven flows. Additionally, we demonstrate that in the full <span><math><mrow><mn>3</mn><mi>D</mi></mrow></math></span> model, a normal stress boundary condition at the inlet/outlet implies a Dirichlet condition for the pressure in the Reynolds equation associated with pressure-driven flow. Furthermore, we establish that a Dirichlet condition for the velocity at the inlet/outlet in the <span><math><mrow><mn>3</mn><mi>D</mi></mrow></math></span> model results in a Neumann condition for the pressure in the Reynolds equation.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100145"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46482956","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

Prediction of microscopic residual stresses using genetic programming 用遗传规划预测微观残余应力

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100141

Laura Millán , Gabriel Kronberger , Ricardo Fernández , Gizo Bokuchava , Patrice Halodova , Alberto Sáez-Maderuelo , Gaspar González-Doncel , J. Ignacio Hidalgo

{"title":"Prediction of microscopic residual stresses using genetic programming","authors":"Laura Millán , Gabriel Kronberger , Ricardo Fernández , Gizo Bokuchava , Patrice Halodova , Alberto Sáez-Maderuelo , Gaspar González-Doncel , J. Ignacio Hidalgo","doi":"10.1016/j.apples.2023.100141","DOIUrl":"https://doi.org/10.1016/j.apples.2023.100141","url":null,"abstract":"<div><p>Metallurgical manufacturing processes commonly used in the industry (rolling, extrusion, shaping, machining, etc.) usually cause residual stress development which can remain after thermal heat treatments. These stresses can be detrimental for the in-service performance of structural components, which makes their study and understanding important. Residual stress variations are usually determined at a macroscopic scale (commonly, using diffraction methods). However, stress variations at the microscopic scale of the individual crystallites (grains), are also relevant. Contrary to the macroscopic residual stresses, microscopic residual stresses are difficult to quantify using conventional procedures. We propose to use machine learning to find equations that describe microscopic residual stresses. Concretely, we show that we are able to learn equations to reproduce the diffraction profiles from microstructural characteristics using genetic programming. We evaluate the learned equations using real neutron diffraction peaks as a reference, obtaining accurate results for the most frequent grain orientations with runtimes of a few minutes.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100141"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50182919","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

Planar phonon anisotropy, and a way to detect local equilibrium temperature in graphene 平面声子各向异性，以及一种检测石墨烯局部平衡温度的方法

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100135

Marco Coco

引用次数: 0