Applications in engineering science最新文献_第8页

Avoiding localization instabilities in rotary pleating 避免旋转打褶中的局部化不稳定性

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100129

Tian Yu , J.A. Hanna

{"title":"Avoiding localization instabilities in rotary pleating","authors":"Tian Yu , J.A. Hanna","doi":"10.1016/j.apples.2023.100129","DOIUrl":"10.1016/j.apples.2023.100129","url":null,"abstract":"<div><p>Rotary pleating is a widely used process for making filters out of nonwoven fabric sheets. This involves indirect elastic–plastic bending of pre-weakened creases by continuously injecting material into an accordion-shaped pack. This step can fail through a localization instability that creates a kink in a pleat facet instead of in the desired crease location. In the present work, we consider the effects of geometric and material parameters on the rotary pleating process. We formulate the process as a multi-point variable-arc-length boundary value problem for planar inextensible rods, with hinge connections. Both the facets (rods) and creases (hinges) obey nonlinear moment–curvature or moment–angle constitutive laws. Some unexpected aspects of the sleeve boundary condition at the point of material injection, common to many continuous sheet processes, are noted. The process, modeled as quasistatic, features multiple equilibria which we explore by numerical continuation. The presence of, presumably stable, kinked equilibria is taken as a conservative sign of potential pleating failure. Failure may also occur due to localization at the injection point. We may thus obtain “pleatability surfaces” that separate the parameter space into regions where mechanical pleating will succeed or fail. Successful pleating depends primarily on the distance between the injection point and the pleated pack. Other factors, such as the crease stiffness and strength relative to that of the facets, also have an influence. Our approach can be adapted to study other pleating and forming processes, the deployment and collapse of folded structures, or multi-stability in compliant structures.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100129"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49336189","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 sediment transport theory based on distortion-free-boundary nonhomogeneous fluid flows 基于无畸变边界非均匀流体流动的泥沙输运理论

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100148

Arno Roland Ndengna Ngatcha , Boniface Nkonga

{"title":"A sediment transport theory based on distortion-free-boundary nonhomogeneous fluid flows","authors":"Arno Roland Ndengna Ngatcha , Boniface Nkonga","doi":"10.1016/j.apples.2023.100148","DOIUrl":"10.1016/j.apples.2023.100148","url":null,"abstract":"<div><p>Over the last 50 years several sediment transport models in coastal environments based on Shallow Water(SW) type models have been developed in the literature. The water flow over an abrupt moving topography quickly spatially variable becomes accelerated and strongly varied arising the turbulence (distortion). The acceleration and strong variation of the flow facilitate the transport of a large quantity of sediments present at the bottom while modifying it. The mathematical models based on SW type models widely used to describe the sediment transport phenomena do not account the distortion effects. Indeed, it is well-known that the SW models are derived from first order approximation of long wave theory. The acceleration and strong variation of the water flow near the bottom is due to the distortion of the horizontal velocity profile along the vertical direction. One can regard distortion as a combination of strain and rotation. The effect of the rotational component is to weaken the effect of the strain somewhat. In this work, we put in place a king theory of sediment transport derived from the second order approximation of long wave theory that can describe sediment transport processes in distortion-free-boundary nonhomogeneous fluid flows. The derived model accounts the distortion (fluctuation with great correlation lengths) that creates the turbulence. Moreover, the model differentiates the fluid velocity from sediment velocity (phase-lag) near the sediment bed. The proposed theory significantly reduces the modeling errors observed in several sediment transport models based on nonhomogeneous shallow water equations and has a great potential to increase the predictive power of sediment transport models in rivers, lakes, coastal flows, ocean basins and so on. The proposed theory improves several existing sediment transport theories recently developed in the literature and can be apply with some degree confidence.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100148"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48733851","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

Chloride permeability through different specimen surfaces of blast-furnace slag cement concrete with and without air-entraining agent 加与不加引气剂的高炉矿渣水泥混凝土试样表面氯离子渗透性研究

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100134

M. Anwar, Dina A. Emarah

{"title":"Chloride permeability through different specimen surfaces of blast-furnace slag cement concrete with and without air-entraining agent","authors":"M. Anwar, Dina A. Emarah","doi":"10.1016/j.apples.2023.100134","DOIUrl":"10.1016/j.apples.2023.100134","url":null,"abstract":"<div><p>Numerous research has investigated the effects of blast furnace slag as a cementitious or substitute cementing material on the characteristics of concrete. Blast furnace slag cement (BFSC) shows promise in the concrete permeability domain, where this extra cementing ingredient enhances the chloride attack resistance of concrete. Four mixtures of BFSC concrete made with 0.5, and 0.6 water-to-cement ratios (w/c) were studied. The effect of using an air-entraining agent (AEA) and a change in the surface of tested samples (top, bottom, and side) on the chloride penetration and its diffusion coefficient has been investigated. The properties of fresh and hardened concrete were determined. This research has its novelty for the first time, where the chloride contents were determined through specimens' top, bottom, and side surfaces using potentiometric titration. The results indicated that the air-entraining agent and w/c ratio had inversely affected the invested concrete properties. The measured total and soluble chloride content at a depth of 20∼30 mm is less than the limits of the corrosion threshold for the three studied surfaces. Also, changes in the w/c ratio, cement content, and AEA affect the diffusion coefficient.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100134"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43274413","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

Collection of oil mist using a baffle plate-type mist trap 采用挡板式疏雾器收集油雾

Applications in engineering science Pub Date : 2023-09-01 DOI: 10.1016/j.apples.2023.100137

Kotaro Takamure , Tomomi Uchiyama , Shogo Ando , Hayato Kato , Hiroshi Nakayama

{"title":"Collection of oil mist using a baffle plate-type mist trap","authors":"Kotaro Takamure , Tomomi Uchiyama , Shogo Ando , Hayato Kato , Hiroshi Nakayama","doi":"10.1016/j.apples.2023.100137","DOIUrl":"10.1016/j.apples.2023.100137","url":null,"abstract":"<div><p>In the field of metal cutting, the cutting oil scatters in air as a microscale oil mist, which adversely affects the work environment. A baffle plate-type mist trap was manufactured as simple equipment for collecting oil mist floating in air. The oil mist collection rate and pressure loss were determined using experiments and numerical simulations while varying the number of baffle plates and inflow velocity of air. The experimental results showed that the pressure drop increased with the number of baffle plates, whereas the oil mist collection rate improved. It was also clarified that larger particles can be collected as the number of baffle plates increased. Numerical simulations showed that a high amount of oil mist was trapped upstream of the second baffle plate, and the baffle plate placed further downstream had minimal contribution to oil mist collection. In both the experiments and numerical simulations, the oil mist collection efficiency was the highest when six baffle plates were arranged. This is because the pressure drop increases depending on the number of baffle plates, whereas the mist collection rate is almost constant when many baffle plates are placed.</p></div>","PeriodicalId":72251,"journal":{"name":"Applications in engineering science","volume":"15 ","pages":"Article 100137"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46768669","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

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