Applied Mechanics Reviews最新文献_第9页

Shear Band Control for Improved Strength-Ductility Synergy in Metallic Glasses 提高金属玻璃强度-延性协同效应的剪切带控制

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-10-18 DOI: 10.1115/1.4056010

Z. Sha, Y. Teng, L. H. Poh, T. Wang, Huajian Gao

引用次数: 7

Design and Fabrication of Untethered Light-Actuated Microbots in Fluid for Biomedical Applications 生物医学流体中无系留光驱动微型机器人的设计与制造

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-10-17 DOI: 10.3390/applmech3040071

Md. Faiyaz Jamil, Mishal Pokharel, Kihan Park

{"title":"Design and Fabrication of Untethered Light-Actuated Microbots in Fluid for Biomedical Applications","authors":"Md. Faiyaz Jamil, Mishal Pokharel, Kihan Park","doi":"10.3390/applmech3040071","DOIUrl":"https://doi.org/10.3390/applmech3040071","url":null,"abstract":"Untethered mobile robots at the micro-scale have the ability to improve biomedical research by performing specialized tasks inside complex physiological environments. Light-controlled wireless microbots are becoming the center of interest thanks to their accuracy in navigation and potential to carry out operations in a non-invasive manner inside living environments. The pioneering light-engineered microbots are currently in the early stage of animal trials. There is a long way ahead before they can be employed in humans for therapeutic applications such as targeted drug delivery, cancer cell diagnosis, tissue engineering, etc. The design of light-actuated microbots is one of the challenging parts along with the biocompatibility and precision control for in vivo applications. Recent progress in light-activated microbots has revealed a few innovative design concepts. In this study, we presented a framework on the different aspects with a comparative analysis of potential designs for the next generation of light-controlled microbots. Utilizing numerical simulations of fluid-structure interactions, limiting design elements of the microbots are addressed. We envision that this study will eventually facilitate the integration of robotic applications into the real world owing to the described design considerations.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"16 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83537897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Undamped Free Vibration Analysis of Functionally Graded Beams: A Dynamic Finite Element Approach 功能梯度梁无阻尼自由振动分析:一种动力有限元方法

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-10-07 DOI: 10.3390/applmech3040070

A. Gee, S. M. Hashemi

引用次数: 1

A Review of Techniques for Measuring the Biot Coefficient and Other Effective Stress Parameters for Fluid-Saturated Rocks 饱和流体岩石Biot系数及其他有效应力参数测量技术综述

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-10-07 DOI: 10.1115/1.4055888

H. Kasani, A. Selvadurai

{"title":"A Review of Techniques for Measuring the Biot Coefficient and Other Effective Stress Parameters for Fluid-Saturated Rocks","authors":"H. Kasani, A. Selvadurai","doi":"10.1115/1.4055888","DOIUrl":"https://doi.org/10.1115/1.4055888","url":null,"abstract":"\u0000 Predicting the behavior of a saturated rock with variations in pore fluid pressure during geo-energy production and storage, deep geological disposal of nuclear wastes, etc. is carried out using the isothermal theory of poroelasticity that incorporates Biot's effective stress principle. Several experimental methods for determining Biot's effective stress parameter have been documented in the literature. The original definition of Biot's effective stress is constantly being extended to account for non-linear and inelastic behavior of the rock. The objective of this study is to review the fundamentals of the original experimental approach for determining Biot's coefficient and other developments, their advantages and disadvantages, and include several case studies. Current techniques are based on different premises: jacketed and unjacketed bulk moduli or compressibility values; volume changes of the bulk and pore fluid from a drained triaxial test on a saturated sample; isotropic-isochoric compression tests on a saturated sample; matching volumetric strains or failure envelopes for dry and saturated samples; variations of rock properties, such as volumetric strain, permeability, compressional and shear wave velocities, with respect to confining stress and pore pressure; estimation of the Biot coefficient from other poroelastic parameters; and approximation of the dry bulk modulus or unjacketed bulk modulus of the rock from mineralogical compositions or ultrasonic wave velocities. This article discusses variations in Biot's effective stress coefficients produced using the different techniques and how factors such as pore geometry, test conditions, stress path, and test temperature affect the Biot's coefficient.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"46 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87334262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

A Novel Technique for Temporarily Repair and Improvement of Damaged Pin Joint Support Bores 一种临时修复和改进损伤销钉连接支撑孔的新技术

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-10-06 DOI: 10.3390/applmech3040069

Ø. Karlsen, H. Lemu, I. Berkani

{"title":"A Novel Technique for Temporarily Repair and Improvement of Damaged Pin Joint Support Bores","authors":"Ø. Karlsen, H. Lemu, I. Berkani","doi":"10.3390/applmech3040069","DOIUrl":"https://doi.org/10.3390/applmech3040069","url":null,"abstract":"Damaged support bores due to wear and ovality can be critical for a machine and its operation, in addition to representing a safety problem and risk of pin breakage. It can be a costly operation to perform the required repairs in between planned service periods, especially because of the unplanned down time. A joint with a standard cylindrical pin will often experience wear and ovality in the support bore surfaces, and at some point, repairs will have to be performed. This study investigates and compares five options when a joint with a cylindrical pin has reached a severe level of wear and ovality, outside its planned service stop. The work involved testing the viability of 3D scanning of the damaged bore surface, 3D printing of a metal bushing, and inserting the bushing into the damaged joint. In addition, two pin solutions, i.e., a standard cylindrical pin and an expanding pin type, were installed into the repaired joint, loaded, and the strain on the pin ends close to the supports was measured. For the sake of comparison, the supports had both smooth circular bore and severe wear and ovality. It was concluded that it is possible to produce and install the 3D-printed bushing insert without major problems; the insert had satisfactory capability during test loading, and it most probably represents a good solution when it comes to the reduction in unwanted downtime during unplanned repairs of damaged joints.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"24 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77926557","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application-Oriented Digital Image Correlation for the High-Speed Deformation and Fracture Analysis of AISI 1045 and Ti6Al4V Materials 面向应用的数字图像相关技术在AISI 1045和Ti6Al4V材料高速变形和断裂分析中的应用

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-10-05 DOI: 10.3390/applmech3040068

L. Gerdes, S. Berger, J. Saelzer, Pascal Franck, Ramon Helwing, A. Zabel, F. Walther

{"title":"Application-Oriented Digital Image Correlation for the High-Speed Deformation and Fracture Analysis of AISI 1045 and Ti6Al4V Materials","authors":"L. Gerdes, S. Berger, J. Saelzer, Pascal Franck, Ramon Helwing, A. Zabel, F. Walther","doi":"10.3390/applmech3040068","DOIUrl":"https://doi.org/10.3390/applmech3040068","url":null,"abstract":"In order to achieve realistic simulations of the chip formation, high quality input data regarding the flow stress and damage behavior of the materials are required. The split Hopkinson pressure bar (SHPB) test setup for the characterization of highly dynamic material properties offers a suitable method for generating high strain rates, similar to those in the chip formation zone. However, the strain measurement in SHPB is usually performed by means of strain gauges. This leads to an unreliable evaluation of strain rate and flow stress/shear flow stress in the case of an inhomogeneous material deformation, since this method presents the total strain whilst excluding local deformations. Inhomogeneous deformations are induced deliberately in special shear specimens, as they are also observed in the investigated cylindrical specimens. The present work deals with this issue by providing two additional measurement techniques, which are applied in SHPB tests for cylindrical specimens made of AISI 1045 and Ti6Al4V. To enable a local strain resolution, digital image correlation (DIC) is applied to high-speed images of the deformation process. In order to allow for the detection of shear bands in the specimens, a deep-learning-based approach is presented. The two measurement methods (strain gauges and DIC) are compared and discussed. In particular, the findings regarding the inhomogeneous deformation of Ti6Al4V allow for future improvements in the result quality of SHPB tests. The presented algorithm shows promising predictions for shear band detection and creates the basis for an automated evaluation of shear sample results, as well as an AI-based pre-selection of frames for the DIC evaluation of SHPB tests.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"26 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84133572","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Multidisciplinary Design Optimization of a Re-Entry Spacecraft via Radau Pseudospectral Method 基于Radau伪谱法的再入航天器多学科设计优化

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-09-26 DOI: 10.3390/applmech3040067

Masoud Kabganian, S. M. Hashemi, J. Roshanian

{"title":"Multidisciplinary Design Optimization of a Re-Entry Spacecraft via Radau Pseudospectral Method","authors":"Masoud Kabganian, S. M. Hashemi, J. Roshanian","doi":"10.3390/applmech3040067","DOIUrl":"https://doi.org/10.3390/applmech3040067","url":null,"abstract":"The design and optimization of re-entry spacecraft or its subsystems is a multidisciplinary or multiobjective optimization problem by nature. Multidisciplinary design optimization (MDO) focuses on using numerical optimization in designing systems with several subsystems or disciplines that have interactions and independent actions. In the present paper, the system-level optimizer, trajectory, geometry and shape, aerodynamics, and aerothermodynamics differential equations, are converted to algebraic equations using the Radau pseudospectral method (RPM) since a spacecraft is a nonlinear, extensive, and sparse system. The solution to the problem with the help of MDO is reached by iterating all the disciplines together; one can simultaneously enhance the design, decrease the time and cost of the entire design cycle, and minimize the structural mass of a re-entry spacecraft. Considering various methods presented in earlier research works, a combined and innovative all-at-once (AAO), RPM-based MDO method, including the key subsystems in the design process of a re-entry capsule-shape spacecraft with a low lift-to-drag ratio (L/D), is presented. Considering the applicable state and control variables, various constraints, and parameters applied to several geometric shapes of a blunt capsule and using Apollo’s aerodynamic and aerothermodynamic coefficients, the optimized dimensions for a re-entry spacecraft are presented. The introduced optimization scheme led to a 17% mass reduction compared to the original mass of the Apollo vehicle. Fast computing and simplified models are used together in this method to analyze a wide range of vehicle shapes and entry types during conceptual design.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"173 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77154725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Theoretical and Experimental Comparisons of Total Solar Transmittance for Polycarbonate Sheet with Twin Wall Rectangular Structure 双壁矩形结构聚碳酸酯薄板太阳总透射率的理论与实验比较

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-09-20 DOI: 10.3390/applmech3040066

Z. Zapałowicz, Agnieszka Garnysz-Rachtan

{"title":"Theoretical and Experimental Comparisons of Total Solar Transmittance for Polycarbonate Sheet with Twin Wall Rectangular Structure","authors":"Z. Zapałowicz, Agnieszka Garnysz-Rachtan","doi":"10.3390/applmech3040066","DOIUrl":"https://doi.org/10.3390/applmech3040066","url":null,"abstract":"Multiwall polycarbonate sheets are applied as construction elements. Modelling and analysis of thermal processes that occur in this material demand the knowledge of solar transmittance. Values of this parameter determined in laboratory conditions are given in the technical specification of the product. However, the parameter is in practice a complex function depending on the number of factors. This paper presents theoretical and experimental research results for total solar transmittance (TST) for a polycarbonate sheet with twin wall rectangular structure. Theoretical TST is calculated as a product of transmissivity after accounting for light absorption in polycarbonate and of transmissivity after accounting for multiple reflections of solar rays from walls of a channel. The first kind of transmissivity is insignificant and can be neglected. The second one depends on the number of reflection layers, season, and time of day. Experimental TST is determined as the ratio of irradiance under and above the polycarbonate sheet measured by pyranometers. Experimental TST is also a function of time of day and season. Both kinds of TST have an approximately constant value in the time about noon. The theoretical values of TST (0.74) are approximately equal to experimental values of TST (0.75) for the selected summer day. The value of TST in catalogue is equal to 0.82.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"65 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78170019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Al-RHEA Particulates MMCs by PM Route: Mechanical Properties and Sliding Wear Response Al-RHEA颗粒的PM路径:力学性能和滑动磨损响应

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-09-15 DOI: 10.3390/applmech3030065

E. Ananiadis, Alexander Efstathios Karantzali, D. Exarchos, T. Matikas

引用次数: 2

Aerodynamic Shape Optimization of an Aircraft Propulsor Air Intake with Boundary Layer Ingestion 考虑边界层进气的飞机推进器进气外形优化

IF 14.3 1区工程技术

Applied Mechanics Reviews Pub Date : 2022-09-12 DOI: 10.3390/applmech3030064

A. Sudasinghe, Padmassun Rajakareyar, E. Matida, Hamza abo el Ella, M. ElSayed

{"title":"Aerodynamic Shape Optimization of an Aircraft Propulsor Air Intake with Boundary Layer Ingestion","authors":"A. Sudasinghe, Padmassun Rajakareyar, E. Matida, Hamza abo el Ella, M. ElSayed","doi":"10.3390/applmech3030064","DOIUrl":"https://doi.org/10.3390/applmech3030064","url":null,"abstract":"The growth of the airline industry has highlighted the need for more environmentally conscious aviation, leading to the conceptualization of more fuel-efficient aircraft. One concept that has received significant attention and has been associated with improved fuel efficiency is the boundary layer ingesting (BLI) propulsion system, which refers to the ingesting of the aircraft wake by the propulsors. Although BLI has theoretically been proven to reduce fuel burn, this can potentially be offset by the reduced efficiency and stability experienced by the propulsor in the presence of distorted inflow. Therefore, engine intakes must be optimized in order to mitigate the effects of BLI on the propulsion system. In this work, the shape optimization of a BLI intake is investigated using a free-form deformation technique in combination with a multi-objective genetic algorithm, in order to minimize pressure losses and distortion at the engine inlet. The optimization is performed on an S-duct intake at a cruise altitude of approximately 37,000 feet and a free stream Mach number of 0.7. An optimization strategy was developed for the task which was able to produce a Pareto optimal set of designs with improved pressure recovery and distortion. The general trend of the optimal designs shows that to reduce distortion the optimizer accelerates the flow to reduce the size of the low total pressure region and increase the dynamic pressure at the engine inlet. In contrast, the pressure recovery was increased by reducing velocity as well as shifting the maximum velocity region to the outlet, which reduces the viscous dissipation losses within the intake. The final result is a fully autonomous optimization strategy resulting in reduced pressure losses and reduced distortion leading to higher efficiency BLI S-duct intake designs.","PeriodicalId":8048,"journal":{"name":"Applied Mechanics Reviews","volume":"40 1","pages":""},"PeriodicalIF":14.3,"publicationDate":"2022-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78117409","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1