Hessein Ali

Hessein Ali
Union College · Mechanical Engineering

Ph.D. Mechanics of Materials and Structures

About

24
Publications
8,941
Reads
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163
Citations
Citations since 2017
23 Research Items
161 Citations
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20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Introduction
I am currently a Visiting Assistant Professor at the Mechanical Engineering Department at Union College. My primary research interest is in the broad area of solid mechanics with focus on discovering relationships between geometry, architecture and materials. Examples include using fish scale like structures for designing lightweight programmable materials, discovering relationships between material micro-architecture and unique properties (e.g. corrosion resistance) for aerospace applications.
Additional affiliations
September 2021 - present
Union College
Position
  • Professor (Assistant)
May 2017 - August 2021
University of Central Florida
Position
  • Research Assistant
Description
  • Statics and Dynamics of Biomimitic Scales
September 2016 - April 2017
University of Central Florida
Position
  • Research Assistant
Description
  • the project I was helping working on was: Biomechanical Invesgaon of the Influence of Increased Femoral Anteversion on the Success of Reducon of Severe Grades of Developmental Dysplasia of the Hip with the Pavlik Harnes

Publications

Publications (24)
Article
Full-text available
A biofilm is an interface-associated colloidal dispersion of bacterial cells and excreted polymers in which the microorganisms find protection from the environment. Successful colonization of a surface by a bacterial community typically means a detriment to human health or property. Insight into the biofilm life-cycle provides clues on how their pr...
Article
Bacteria can thrive in biofilms, which are intricately organized communities with cells encased in a self-secreted matrix of extracellular polymeric substances (EPS). Imposed hydrodynamic stresses can transform this active colloidal dispersion of bacteria and EPS into slender thread-like entities called streamers. In this perspective article, the r...
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...
Article
Fouling of surfaces in prolonged contact with liquid often leads to detrimental alteration of material properties and performance. A wide range of factors which include mass transport, surface properties and surface interactions dictate whether foulants are able to adhere to a surface. Passive means of foulant rejection, such as the microscopic pat...
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...
Article
Full-text available
The influence of diet on the development of osteoporosis is significant and not fully understood. This study investigated the effect of diets of varying lipid profiles and ω-3, ω-6 and ω-9 composition on the structural and mechanical properties of bone. The hypothesis studied was that a diet high in saturated fat would induce osteoporosis and produ...
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...
Conference Paper
Cantilevered beams with piezoceramic layers are typically used to generate electrical energy; hence, a base excitation on a harvester is required. This work investigates the use of a link-type mechanism called the Peaucellier mechanism to actuate piezoelectric energy harvesters. The Peaucellier mechanism is known to trace an exact straight line, pr...
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
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
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
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...
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
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
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...
Chapter
Full-text available
This paper presents the use of a geared five-bar with connecting rod and sliding output for mechanical presses. Mechanical presses are used to form sheet metal parts and have economical benefits to other presswork production methods. A conventional mechanical press is driven with a slider-crank mechanism. Extended drive presses are used to alter th...
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
This paper presents a methodology for synthesizing planar linkages to approximate any prescribed periodic function. The mechanisms selected for this task are the slider-crank and the geared five-bar with connecting rod and sliding output (GFBS), where any number of double-crank (or drag-link) four-bars are used as drivers. A slider-crank mechanism,...
Conference Paper
Full-text available
This paper presents a methodology for synthesizing planar linkages to approximate any prescribed periodic function. The mechanisms selected for this task are the slider-crank and the geared five-bar with connecting rod and sliding output (GFBS), where any number of drag-link (or double crank) four-bars are used as drivers. A slider-crank mechanism,...

Questions

Questions (4)
Question
I am trying to reproduce some results in a published work entitled " A finite element based model for prediction of corrosion defect growth on pipelines". The simulation was possible through sequential coupling when static studies are performed as presented by COMSOL case www.comsol.co.in/model/stress-corrosion-39121 . The issues is when looking at the long life of the defect (time dependent study). I have tried to do one study, with three steps:
step1: stationary solid mechanics (solves for only solid mechanics)
step2: current distribution initialization ( solves for secondary current and deformed geometry).
step3: time dependent which solves for the following
1. solid mechanics; 2. secondary current distribution; 3. deformed geometry.
I was never able to predict an increase in the stress in the location of defect center (as shown in the paper). So any help/guidance would be appreciated for solving this issue would be appreciated?
Regards,
Question
I am trying to model a composite material with periodic microstructure. I am trying to use the approach presented by Feyel (FE2 multiscale). it seems however a bit challenging to write a MATLAB code for the periodic homogenization theory (There is also no available codes). Therefore, I am seeking an initial guide to write a MATLAB code addresses my composite structure.
Thanks in advance!
Question
I have a beam with embedded-inclined fins at the top. The fins interact during bending so nonlinearity due to contact is there. I know that frequency in Abaqus can handle free vibration but it does work with contact nonlinearity. Is there anyway I can run free vibration simulation for the beam with contact nonlinearity?
Best,
Hessein
Question
I have a beam with small rigid plate impeded at the top. the plate are distributed equally along the beam. I am wondering If there's a formula to predict E_eff to study the linear bending of the beam

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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.
Archived project
Using inverse kinematics to come up with a new harness or modify the Pavlik harness.