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Applied Mechanics
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Exclusive Papers of the Editorial Board Members (EBMs) of Applied...
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Exclusive Papers of the Editorial Board Members (EBMs) of Applied Mechanics

A special issue of Applied Mechanics (ISSN 2673-3161).

Deadline for manuscript submissions: closed (25 June 2021) | Viewed by 28252

Special Issue Editor

Prof. Dr. Magd Abdel Wahab

E-Mail Website
Guest Editor
Laboratory Soete, Faculty of Engineering and Architecture, Ghent University, Technologiepark Zwijnaarde 903, B-9052 Zwijnaarde, Belgium
Interests: computational mechanics; fracture mechanics; damage mechanics; finite element analysis; fatigue of materials; fretting fatigue; fretting wear; durability; dynamics and vibration of structures
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Special Issue Information

Dear Colleagues,

This Special Issue of Applied Mechanics is dedicated to all topics related to subject areas of the journal https://www.mdpi.com/journal/applmech/about. It comprises a selection of high-quality papers in open access form by the Editorial Board Members (EBMs) of Applied Mechanics. Authors recommended and invited by the Editorial Board Members and the Editor-in-Chief are also welcome to submit an article. The Special Issue is open to research articles highlighting interesting results of the research groups of our EBMs, as well as review articles in relevant fields.

Prof. Dr. Magd Abdel Wahab
Editor-in-Chief of Applied Mechanics

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Published Papers (5 papers)

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Research

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19 pages, 13212 KiB  
Article
Mechanical Properties of Selected Epoxy Adhesive and Adhesive Joints of Steel Sheets
by Anna Rudawska
Appl. Mech. 2021, 2(1), 108-126; https://doi.org/10.3390/applmech2010007 - 3 Mar 2021
Cited by 17 | Viewed by 4445
Abstract
The article presents the issues of the mechanical properties of epoxy adhesives and the adhesive joints strength of steel sheets which were made using the epoxy adhesives. The aim of the paper is to study the mechanical properties of epoxy adhesive of different [...] Read more.
The article presents the issues of the mechanical properties of epoxy adhesives and the adhesive joints strength of steel sheets which were made using the epoxy adhesives. The aim of the paper is to study the mechanical properties of epoxy adhesive of different epoxy resin/curing agent ratios (within and above the recommended stoichiometric ratio) and their effect on mechanical properties of adhesive joints of steel sheets. In experimental tests three types of epoxy adhesives, containing a low molecular weight epoxy resin based on bisphenol A and polyamide curing agent, were used. A single-lap adhesive joint type of stainless-steel sheets was also applied. Two types of strength test were used: the compressive strength tests (DIN EN 196-1) for epoxy adhesive samples and the shear strength tests (DIN EN 1465) for adhesive joints. Both the analysis of the strength results of the samples of epoxy adhesive and adhesive joints as well as the failure analysis was carried out. On the basis of the results of strength tests it can be stated that the greatest deformation occurred for the samples of epoxy adhesive containing the modified epoxy resin (epoxy number—0.40) and the polyamide curing agent, and the smallest for the samples of epoxy adhesive containing the basic epoxy resin (epoxy number—0.49–0.52) and the polyamide curing agent. The epoxy adhesives with a smaller amount of curing agent were characterized by higher strength. This applies to all analyzed epoxy resins. The same dependences were obtained for the strength of adhesive joints of steel sheets made of the analyzed epoxy adhesive. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members (EBMs) of Applied Mechanics)
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18 pages, 2663 KiB  
Article
Dynamic Equilibrium Equations in Unified Mechanics Theory
by Noushad Bin Jamal M, Hsiao Wei Lee, Chebolu Lakshmana Rao and Cemal Basaran
Appl. Mech. 2021, 2(1), 63-80; https://doi.org/10.3390/applmech2010005 - 26 Feb 2021
Cited by 5 | Viewed by 5356
Abstract
Traditionally dynamic analysis is done using Newton’s universal laws of the equation of motion. According to the laws of Newtonian mechanics, the x, y, z, space-time coordinate system does not include a term for energy loss, an empirical damping term “C” is used [...] Read more.
Traditionally dynamic analysis is done using Newton’s universal laws of the equation of motion. According to the laws of Newtonian mechanics, the x, y, z, space-time coordinate system does not include a term for energy loss, an empirical damping term “C” is used in the dynamic equilibrium equation. Energy loss in any system is governed by the laws of thermodynamics. Unified Mechanics Theory (UMT) unifies the universal laws of motion of Newton and the laws of thermodynamics at ab-initio level. As a result, the energy loss [entropy generation] is automatically included in the laws of the Unified Mechanics Theory (UMT). Using unified mechanics theory, the dynamic equilibrium equation is derived and presented. One-dimensional free vibration analysis with frictional dissipation is used to compare the results of the proposed model with that of a Newtonian mechanics equation. For the proposed entropy generation equation in the system, the trend of predictions is comparable with the reported experimental results and Newtonian mechanics-based predictions. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members (EBMs) of Applied Mechanics)
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15 pages, 3855 KiB  
Article
Experimental Characterization of Low-Speed Passive Discharge Losses of a Flywheel Energy Storage System
by Miles Skinner and Pierre Mertiny
Appl. Mech. 2021, 2(1), 1-15; https://doi.org/10.3390/applmech2010001 - 12 Jan 2021
Cited by 3 | Viewed by 4016
Abstract
Flywheel energy storage has a wide range of applications in energy grids and transportation. The adoption of high-performance components has made this technology a viable alternative for substituting or complementing other storage devices. Flywheel energy storage systems are subject to passive discharge attributed [...] Read more.
Flywheel energy storage has a wide range of applications in energy grids and transportation. The adoption of high-performance components has made this technology a viable alternative for substituting or complementing other storage devices. Flywheel energy storage systems are subject to passive discharge attributed primarily to electrical machine losses, bearing rolling friction, and aerodynamic drag of the flywheel rotor. In the present study, measurements are presented for complete discharge experiments using a flywheel system featuring a vacuum enclosure. Best-fit equations were applied to the test data and compared to analytical models. Analysis of the best-fit equations indicates that they may serve as empirical models for approximating passive discharge under given conditions. Bearing losses, which varied linearly with velocity but were otherwise unaffected throughout the experiments, were larger than aerodynamic drag at low air pressures and low velocities. Aerodynamic drag became significant as velocity exceeded approximately 3400 rpm. The electrical machine was found to be the most significant source of passive discharge at all velocities and pressures. Based on these findings, it is recommended to maintain a low-pressure environment in the flywheel enclosure and to decouple the electrical machine from the rotor whenever possible to eliminate associated losses. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members (EBMs) of Applied Mechanics)
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Review

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17 pages, 5054 KiB  
Review
Ship Handling in Unprotected Waters: A Review of New Technologies in Escort Tugs to Improve Safety
by Santiago Iglesias-Baniela, Juan Vinagre-Ríos and José M. Pérez-Canosa
Appl. Mech. 2021, 2(1), 46-62; https://doi.org/10.3390/applmech2010004 - 22 Feb 2021
Cited by 4 | Viewed by 7968
Abstract
It is a well-known fact that the 1989 Exxon Valdez disaster caused the escort towing of laden tankers in many coastal areas of the world to become compulsory. In order to implement a new type of escort towing, specially designed to be employed [...] Read more.
It is a well-known fact that the 1989 Exxon Valdez disaster caused the escort towing of laden tankers in many coastal areas of the world to become compulsory. In order to implement a new type of escort towing, specially designed to be employed in very adverse weather conditions, considerable changes in the hull form of escort tugs had to be made to improve their stability and performance. Since traditional winch and ropes technologies were only effective in calm waters, tugs had to be fitted with new devices. These improvements allowed the remodeled tugs to counterbalance the strong forces generated by the maneuvers in open waters. The aim of this paper is to perform a comprehensive literature review of the new high-performance automatic dynamic winches. Furthermore, a thorough analysis of the best available technologies regarding towline, essential to properly exploit the new winches, will be carried out. Through this review, the way in which the escort towing industry has faced this technological challenge is shown. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members (EBMs) of Applied Mechanics)
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21 pages, 3622 KiB  
Review
Hypervelocity Impacts on Satellite Sandwich Structures—A Review of Experimental Findings and Predictive Models
by Riley Carriere and Aleksandr Cherniaev
Appl. Mech. 2021, 2(1), 25-45; https://doi.org/10.3390/applmech2010003 - 12 Feb 2021
Cited by 9 | Viewed by 5100
Abstract
Sandwich panels are widely used in the design of unmanned satellites and, in addition to having a structural function, can often serve as shielding, protecting the satellites’ equipment from hypervelocity impacts (HVI) of orbital debris and micrometeoroids. This paper provides a comprehensive review [...] Read more.
Sandwich panels are widely used in the design of unmanned satellites and, in addition to having a structural function, can often serve as shielding, protecting the satellites’ equipment from hypervelocity impacts (HVI) of orbital debris and micrometeoroids. This paper provides a comprehensive review of experimental studies in the field of HVI on sandwich panels with honeycomb- and open-cell foam cores, as well as an examination of available predictive models for the assessment of the panels’ ballistic limits. The emphasis of the review is placed on: (i) identifying gaps in the existing experimental database and the appropriate directions for its further expansion; and (ii) understanding the limitations of the available predictive models and the potential for their improvement. Full article
(This article belongs to the Special Issue Exclusive Papers of the Editorial Board Members (EBMs) of Applied Mechanics)
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