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Abdul-Aziz, Ali

Dr. Ali A. Aziz

Senior Research Scientist
NASA Glenn Research Center
Cleveland State University
Chemical and Biomedical Engineering
21000 Brook Park Rd.
MS 6-1
Cleveland OH 44135
United States

tel: 216-433-6729
fax: 216-977-7150
E-mail: ali.abdul-aziz-1@nasa.gov
Web: http://www.grc.nasa.gov/WWW/OptInstr/folk_aziz.html

Area of Expertise

Structural Health Monitoring, Computational NDE, Image Processing, Finite Element, Smart Structures and Analysis of Materials

Biography

Dr. Aziz is currently a Senior Research Scientist at NASA Glenn Research Center through an affiliation with Cleveland State University, Department of Department of Chemical and Biomedical Engineering, Cleveland, Ohio, USA. He has been associated with NASA since 1983; his work included supporting research endeavors in many areas at both the experimental and the analytical levels. Presently, he supports the Optical Instrumentation and NDE Branch research activities in the areas of Non Destructive Evaluation (NDE), Structural Health Monitoring, Rotor Dynamics, Image Processing and Volume Rendering techniques. He is a licensed Professional Engineer in the State of Ohio and a member of several professional organizations. He has received numerous awards from NASA, the American Society for Nondestructive Testing, The International Society of Optical Engineers etc…. Dr. Aziz taught at Cleveland State University, College of Engineering, from 1986-1990. He serves as an Associate Technical Editor on the Board of the "Materials Evaluation Journal". He has authored/co-authored more than 140 technical articles that have been published in scientific journals, conference proceedings and as peer-reviewed NASA Technical memoranda. He also offered numerous invited lectures and presentations at several local colleges and international conferences. He is a Fellow of ASME.

 

Lecture Title(s)

Structural Simulation of Metallic Foam Via NDE 3-D Image based Modeling

Cellular foams are an interesting class of materials that appear widely in nature. Their mechanical and thermal properties encompassing low density, low thermal conductivity and high energy absorption capability have intrigued researchers for centuries. Metal foams are expected to find use in structural applications where weight is of particular concern, such as space vehicles, rotorcraft blades, car bodies or portable electronic devices. However, the metal foam core must resist transverse shear and compressive loads while remaining integral with the face sheets. Challenges relating to the fabrication and testing of these metal foam panels remain due to some mechanical properties falling short of their theoretical potential. Results from a simulation study evaluating the structural response of foam samples with three different densities are presented. Non Destructive Evaluation (NDE) of the cellular foam sample is carried out using an advanced state of the art Computed Tomography unit. Subsequently, a detailed 3 Dimensional volume of the foam structure is generated using images produced by the NDE technique applied. This NDE image construction processes takes on a concise and refine data analysis to construct a high precision solid model capturing all the fine details within the structure as detected by the NDE data. Additional manipulation using image processing software is applied to identify the NDE captured difference between all three tested foam samples. Further, a high fidelity finite element model is generated for each sample followed by an analysis to evaluate the structural response based on both, the NDE findings and the technique employed. Detailed comparison relevant to the analytical results showing advantages/disadvantages of the NDE-Finite Element combo.  

NDE Using Sensor Based Approach to Propulsion Health Monitoring Of A Turbine Engine Disk

Rotor health monitoring and on-line damage detection have been increasingly gaining interest to manufacturers of aircraft engines, primarily to increase safety of operation and lower the high maintenance costs. But health monitoring in the presence of scatter in the loading conditions, crack size, disk geometry, and material property is rather challenging. However, detection factors that cause fractures and hidden internal cracks can be implemented via noninvasive types of health monitoring and or nondestructive evaluation techniques. These evaluations go further to inspect materials discontinuities and other anomalies that have grown to become critical defects that can lead to failure. To address the bulk of these concerning issues and understand the technical aspects leading to these outcomes, a combined analytical and experimental study is being thought. Results produced from the experiments such as blade tip displacement and other data collected from tests conducted at the NASA Glenn Research Center's Rotordynamics Laboratory, a high precision spin rig, are evaluated, discussed and compared with data predicted from finite element analysis simulating the engine rotor disk spinning at various rotational speeds. Further computations using the progressive failure analysis (PFA) approach with GENOA code to additionally assess the structural response, damage initiation, propagation, and failure criterion are also performed. This study presents an inclusive evaluation of an on-line health monitoring of a rotating disk and an examination for the capability of the in-house spin system in support of ongoing research under the NASA Integrated Vehicle Health Management (IVHM) program.

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