Hossein Ebrahimi

Hossein Ebrahimi
University of Central Florida | UCF · Department of Mechanical and Aerospace Engineering

Doctor of Philosophy

About

29
Publications
3,092
Reads
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122
Citations
Citations since 2017
25 Research Items
120 Citations
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Introduction
Hossein Ebrahimi currently is a PhD candidate at the Department of Mechanical and Aerospace Engineering, University of Central Florida. He does research in Solid Mechanics, Bioinspired Metamaterial and Computational Mechanics. Their current project is 'Bioinspired Elastic Metamaterials'.
Additional affiliations
August 2017 - May 2019
University of Central Florida
Position
  • Graduate Teaching Assistant
Description
  • Administering lectures and lab sessions, grade and design assignments and exams for the following courses: ◾️ Mechanical Systems Laboratory, Instructor: Dr. Sudeshna Pal (Spring 19 and 18) ◾️ Mechanical Systems Laboratory, Instructor: Dr. Jeffrey L. Kauffman (Fall 18) ◾️ Solid Mechanics, Instructor: Dr. Ali P. Gordon (Summer 18) ◾️ Mathematical Methods in MAE, Instructor: Dr. Ranajay Ghosh (Fall 17) ◾️ Modeling Methods in MAE, Instructor: Dr. Alain Kassab (Fall 17)
September 2016 - May 2021
University of Central Florida
Position
  • Research Assistant
Description
  • ◾️ Collaborated in various projects including “Design of bioinspired metamaterial”, “Monitoring of gas turbine blade coatings”, “Soft robotic material design”, “Modeling corrosion initiation”, and “Solar cell failure”. ◾️ Led excellent teamwork in various projects, leading to secure $800k grant funding from the NSF, DOE, and DARPA, resulting in 7 journal articles, 5 conference proceedings, 3 conferences presentation, and collaboration in writing 2 proposals.
December 2012 - May 2015
Khaje Nasir Toosi University of Technology
Position
  • Research Assistant
Description
  • ◾️ Performed project leadership in root cause and failure analysis of thermal barrier coatings (TBCs) under thermo-mechanical fatigue loading, resulting the publication of 3 peer-reviewed journal articles and presenting in 1 conference. ◾️ Managed innovative research focused on failure mechanisms of ceramic coatings using Abaqus/CAE, including cohesive zone model for crack propagation, and UMAT Abaqus User Subroutines for material modeling.
Education
August 2016 - August 2020
University of Central Florida
Field of study
  • Mechanical Engineering
September 2012 - February 2015
Khaje Nasir Toosi University of Technology
Field of study
  • Mechanical Engineering
September 2007 - July 2012
University of Tehran
Field of study
  • Mechanical Engineering

Publications

Publications (29)
Article
Full-text available
In this letter, we investigate the geometrically tailorable elasticity in the twisting behavior of biomimetic scale-covered slender soft substrate. Motivated by qualitative experiments showing a significant torsional rigidity increase, we develop an analytical model and carry out extensive finite element simulations to validate our model. We discov...
Article
Full-text available
Cantilevered beams are of immense importance as structural and sensorial members for a number of applications. Endowing tailorable elasticity can have wide ranging engineering ramification. Such tailorability could be possible using some type of spatial gradation in the beam’s material or cross section. However, these often require extensive additi...
Article
Full-text available
Stiff scales adorn the exterior surfaces of fishes, snakes, and many reptiles. They provide protection from external piercing attacks and control over global deformation behavior to aid locomotion, slithering, and swimming across a wide range of environmental condition. In this report, we investigate the dynamic behavior of biomimetic scale substra...
Article
Full-text available
Biomimetic scale-covered substrates provide geometric tailorability via scale orientation, spacing and also interfacial properties of contact in various deformation modes. No work has investigated the effect of friction in twisting deformation of biomimetic scale-covered beams. In this work, we investigate the frictional effects in the biomimetic s...
Conference Paper
Additive manufacturing of metallic and ceramic components can provide several benefits for gas turbines. This technology can help to decrease time and cost required for prototyping of both operational components and assistive tooling equipment. There are currently many methodologies for metallic and ceramic material printing, and these processes ty...
Article
Cylindrical specimens of Martian and Lunar regolith simulants were molded using a simple salt water binder and sintered at various temperatures for comparing microstructure, mechanical properties and shrinkage. Material microstructure are reported using optical microscope and material testing is done using an MTS universal testing machine. A total...
Article
Fish scales inspired materials platform can provide advanced mechanical properties and functionalities. These materials, inspired from fish scales take the form of either composite materials or multi-material discrete exoskeleton type structures. Over the last decade, they have been under intense scrutiny for generating tailorable and tunable stiff...
Article
There is a growing interest for smart coatings that can be integrated into turbine engines for in-situ temperature measurements or health monitoring. The addition of rare-earth dopants into standard thermal barrier ceramic top coat materials is used to obtain luminescent coatings that enable spectral measurements, for real-time temperature or healt...
Preprint
Full-text available
Cylindrical specimens of Martian and Lunar regolith simulants were molded using a salt water binder and sintered at various temperatures for comparing microstructure, mechanical properties and shrinkage. Material microstructure are reported using optical microscope and material testing is done using an MTS universal testing machine. The experimenta...
Article
We develop the mechanics of combined bending and twisting deformation of a one-dimensional filamentous structure with protruding stiff fish-scale-like plates embedded at an angle on the surface. We develop a Cosserat kinematic formulation along with scale contact constraints. This geometrically exact model allows us to bypass the limitations of sma...
Article
Stress corrosion is a critical issue that leads to high costs in lost equipment and maintenance, affecting the operation and safety of aircraft platforms. Most aerospace structural components use the aluminum alloys 7xxx series, which contain Al, Cu, Zn, and Mg, due to the combined advantage of its high-strength and lightweight. However, such alloy...
Preprint
Full-text available
Conference Paper
Stress corrosion is a critical issue that leads to high costs in lost equipment and maintenance, affecting the operation and safety of aircraft platforms. Most aerospace structural components use the aluminum alloys 7xxx series, which contain Al, Cu, Zn, and Mg, due to the combined advantage of its high-strength and lightweight. However, such alloy...
Conference Paper
Several image processing methods have been implemented over recent years to assist and partially replace on-site technician visual inspection of both manufactured parts and operational equipments. Convolutional neural networks (CNNs) have seen great success in their ability to both identify and classify anomalies within images, in some cases they d...
Conference Paper
The recent advancement in multifunctional thermal barrier coatings (TBCs) for temperature sensing or defect monitoring has gained interest over the past decade as they have shown great potential for optimized engine operation with higher efficiency, reduced fuel consumption and maintenance costs. Specifically, sensor coatings containing luminescent...
Conference Paper
Full-text available
Exoskeletons, such as scales on fishes and snakes were a critical evolutionary adaptation. Honed by millions of years of evolutionary pressures, they are inherently lightweight and yet multifunctional, aiding in protection, locomotion and optical camouflaging. This makes them an attractive candidate for biomimicry to produce high performance multif...
Article
Full-text available
Scales are a path breaking evolutionary adaptation that accompanied vertebrate evolution for the past 500 million years. Inherently lightweight with diverse shapes, sizes, materials, and distribution, they provide remarkable architecture-material enhancement, typical of metamaterials. Here we provide a perspective on mechanical behavior of fish sca...
Conference Paper
Full-text available
Extra-terrestrial and extra-vehicular activity (EVA) require extreme remote maneuverability and dexterity. At the same time, such robots must be lightweight with the possibility of on-site fabrication, retrofitting and assembly. This poses a difficult problem for traditional robotic systems and robotic materials, which are typically bulky, cannot e...
Conference Paper
Full-text available
A single brief exposure of a photovoltaic (PV) module or coupon to cold temperatures down to-40°C, the lower limit in IEC photovoltaic testing standards, significantly degrades the fracture strength of silicon solar cells. To understand the mechanism behind the fracture strength degradation, we built a finite element model of a single cell encapsul...
Article
Covering elastic substrates with stiff biomimetic scales significantly alters the bending behavior via scales engagement. This engagement is the dominant source of nonlinearity in small deflection regime. As deformation proceeds, an initially linear bending response gives way to progressive stiffening and thereafter a geometrically dictated ‘locked...
Poster
Full-text available
Many applications require materials whose response can be tuned such as morphing wings for supermaneuverable vehicles, soft robotics and space structures. Nature achieves this objective using external dermal features – skin, furs, tooth, feathers. These nonlinearities are generated using the geometry and topology of the scales The scales provide di...
Presentation
Full-text available
A metamaterial is a material designed and engineered to obtain some mechanical or physical properties, which cannot be observed in nature or real materials. Metamaterials can be made of assemblies of multiple components and usually have repeating patterns may be inspired from bio-structures. Properties of metamaterials are more affected from their...
Article
Full-text available
Significance Here we show a unique, natural method for microscale jetting of fluid made possible by the tuning of material properties from which the jets emanate. The composite, layered construction of the citrus exocarp allows for the buildup of fluid pressure in citrus oil gland reservoirs and their subsequent explosive rupture. Citrus jetting ha...
Article
Full-text available
Thermal Barrier Coatings (TBCs) are used as thermal insulation to protect components operating at high temperature. A multiple failure mechanism may exist in a TBC system associated with diverse in-service conditions. In this paper, Inconel 617 superalloy substrates were coated with 8% Y2O3 stabilized tetragonal ZrO2 powder, deposited on top of a N...
Article
Thermal Barrier Coatings are used as thermal protective of parts using under high temperature circumstance. These coatings usually include three layers respectively: ceramic top coat, grown oxide layer and bond coat. Due to manufacturing process and special structure of thermal barrier coatings, failure mechanisms of these coatings are affected by...
Article
In this study, the effects of thermal cyclic loading in the presence of a constant mechanical load were evaluated experimentally on failure of thermal barrier coatings. For this purpose, specimens of Inconel 617 with approximate dimensions of 100×10×6.2 mm that coated by two-layered thermal barrier coatings include a Ni22Cr10Al1Y bond coat and ZrO2...

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Projects

Projects (2)
Project
Limitation of bio-compatible materials and relentless Darwinian natural selection have forced life forms to evolve incredible strategies to foster survivability. Some of these strategies are highly counter intuitive. For instance, heterogeneity and free standing surface components (such as dermal modifi cations found in nature) are often avoided in man-made systems due to poorer material properties, interface failure and operating strength (think of dislocations in monocrystals and microcracks in glass panels). On the contrary, natural systems are inherently hierarchical, branched and heterogeneous such as bone, gecko’s feet and scales on animals. Research indicates that these designs are often inherently multifunctional (bones are strong and can store chemicals), ultralight (dermal scales significantly improve mechanical protection and insulation while adding little weight) and can transcend natural limits of chemicals making them (blue pigments which are incredibly difficult to synthesize are still found in nature but by optical manipulation through photonic crystal like architecture). My research interest lies in discovering the underlying mechanisms behind these high performance strategies and amplify them in man-made material systems such as next generation multifunctional & ultralight aerospace structures, super efficient vehicles and high performance buildings.