Soltannia, Babak
Permanent URI for this collectionhttps://hdl.handle.net/10222/76592
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Item Open Access Static and Dynamic Characteristics of Nano-Reinforced 3D-Fiber Metal Laminates Using Non-Destructive Techniques(SAGE, 2020-05-15) Soltannia, Babak; Mertiny, Pierre; Taheri, FaridUncontrolled vibration in mechanical systems (e.g. aircraft, trains and automobiles) may result in undesirable noise and eventually, cause mechanical failure. In this context, the main objective of the present research is to explore parameters that govern and affect the frequency response of three-dimensional fiber metal laminates (3DFMLs). 3DFMLs are a class of novel lightweight hybrid material systems with great potential for use in aforementioned applications. Therefore, the vibration characteristics of the two most commonly used configurations of 3DFMLs are experimentally investigated by nontraditional and conventional approaches. The material damping is also improved by the inclusion of two different types of nanocarbon particles (NCP) within the core and/or interfaces of the hybrid system. The results are presented and compared. The inclusion of NCP improved the fundamental frequency of the system slightly; however, material damping was enhanced significantly when only 1 wt% NCP was used in the interfacial sections of the system.Item Open Access Vibration Analysis of Pole-vaulting via Mathematical Modeling(2020-08-04) Ji, Zeen; Soltannia, BabakThis project studied the factors including the weight of athlete (𝑚) and stiffness of the pole ( 𝑘) that can influence the efficiency of the energy conversion. The efficiency refers to the percentage of initial kinetic energy transferred into potential energy stored in a pole. A mathematical model is built based on Hamilton ’s method to simulate the pole motion. The efficiency can be optimized if 𝑚 and 𝑘 satisfy a linear expression that has been derived in the project.Item Open Access Vibration Characteristics of Multi-Wall Carbon Nanotubes (MWCNT) Reinforced 3D-Fiber Metal Laminates (3D-FML)(11th Canadian-International Conference on Composites (CANCOM2019), 2019-07-24) Soltannia, Babak; Mertiny, Pierre; Taheri, FaridUncontrolled vibration in mechanical systems results in undesirable noise and may cause the eventual mechanical failure of the system. This paper explores the parameters that govern and affect the frequency response of a novel 3D-fiber metal laminate (3D-FML). Specifically, the frequency response of the 3D-FML is evaluated and its vibration response is enhanced by an effective solution. The results obtained by the various approaches are presented and compared to the results obtained by a traditional approach. Moreover, the damping of the system could be enhanced quite significantly, up to 3.49 times, when only 1 wt% multi-wall carbon nanotubes was used to reinforce the system.Item Open Access Solving the Dirichlet Problem for Vibration of Parallelogram-Shaped Membrane using Method of Partial Domains(Canadian Machinery Vibration Association (CMVA), 2019-10-30) Shakeri Mobarakeh, Pouyan; Grinchenko, Victor Timofeevich; Soltannia, BabakIn this study, the Dirichlet boundary problem for vibration of a parallelogram-shaped membrane is solved. The simplicity and transparency of the proposed procedures allow one to clarify the specific features of some state-of-the-art approaches to solve similar problems of mathematical physics. For many types of domains, including a wide range of non-canonical ones, the use of the concept of a general solution of the boundary value problem makes it possible to construct a numerical-analytical solution to the problem. In this case, sets of partial solutions for the basic equations of mathematical physics are used. The main idea is to indicate effective ways to determine arbitrary coefficients and functions that are part of a general solution. The conventional approach for deriving numerical-analytical solutions is used based on the mean square deviation minimization and collocation methods.Item Open Access VIBRATION CHARACTERISTICS OF THERMALLY CYCLED GRAPHENE NANOPLATELET (GNP) REINFORCED 3D-FIBER METAL LAMINATES (3D-FML)(Canadian Machinery Vibration Association (CMVA), 2019-10-30) Soltannia, Babak; Mertiny, Pierre; Taheri, FaridHarsh environmental conditions may cause materials to degrade and eventually fail, or even worse, it can be coupled with undesirable vibrations in mechanical systems, resulting in premature failure of the system. Such combined loading scenarios are often encountered by transport vehicles (i.e., airplane cabins, and train and automobile components). Today, fiber metal laminates (FMLs) and sandwich composites are often used in the fabrication of various components of transport vehicles. Therefore, it is of paramount importance to study the static and dynamic characteristics of such materials under combined loading scenarios and ensure their durability and safety. A recently introduced class of 3D fiber metal laminate (3D-FML) in our research group has shown exemplary mechanical response characteristics; however, the vibration characteristic of this novel hybrid material system under harsh environmental conditions has not been studied. Therefore, exploring the effect of environmental parameters on the frequency response of this class of materials shapes the main objective of this research. Specifically, the main goals of this research are to characterize and understand the frequency response of 3D-FMLs under thermal fatigue and attempt to improve their vibration response by incorporation of an effective solution. To do so, 3D-FMLs specimens are exposed to combined thermal and humidity cycles. Subsequently, the vibration characteristics of the system are experimentally evaluated. An attempt is also made to improve the damping characteristics of the material system by incorporation of graphene nanoplatelet within the interface layers of the hybrid system. It is also demonstrated that recently developed nondestructive techniques can be effectively used to assess the influence of environmental conditions on the static and dynamic behavior of 3D-FMLs and evaluate their potential degradation under thermal fatigue.