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CAMP Annual Report: Page 11

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Structural Health Monitoring and Modeling of Composite Structures

 Professor Ratan Jha’s research areas are structural health monitoring (SHM), modeling of composite and smart structures, adaptive control of structural vibrations, intelligent flight controls, and multidisciplinary design optimization. SHM research focuses on the development of damage detection algorithms through an understanding of structural mechanics, elastic wave propagation, and advanced signal processing. Interactions of Lamb waves with damages are studied to determine type and extent (severity) of damages. Experimental work using PZT actuator/sensor as well as laser vibrometer and Spectral Finite Element models are employed for SHM. Composite modeling is based on higher order laminate theory and random sequential adsorption methods. Complex structures are modeled using FEA for modulus, stress, vibration, and wave propagation studies. Dr. Jha has established the Composite and Smart Structures Laboratory which is well equipped for vibro-acoustics measurements. His contributions have resulted in over 80 publications in international archival journals and refereed conference papers. Dr. Jha has received research grants from NSF, AFOSR, NASA, US Army, NYSERDA and several industries. Prior to joining Clarkson, Dr. Jha worked in the aerospace industry from 1983 to 1995 where he led a team of engineers working on conceptual and preliminary designs of combat aircraft.

Intelligent Infrastructure Systems

Professor Kerop Janoyan, Associate Professor and Executive Officer of the Civil and Environmental Engineering Department at Clarkson, continues to work on developing and deploying novel wireless sensors and sensor networks for intelligent infrastructure systems.  The focus of his work is the design and integration of advanced sensing tools, measurements, and quantitative databases to enable event response, in-service condition assessment, and long-term decision making in intelligent infrastructure management systems.

Professor Janoyan has been active in a number of new projects that are listed below.

 1. Wireless Underground Sensor Network for In-Situ Monitoring of Soil Parameters, Soil-Structure Interaction Behavior, and Buried Utilities

2. Real-time Structural Monitoring Platform for Wind Turbine Systems

3 Advanced Sensing and Structural Evaluation Toolkit (ASSET) for Load Capacity Rating within Bridge Inspection

4. Tool for Analysis of Early Age Transverse Cracking of Composite Bridge Decks

5. Water Quality Measurements using a Novel Buoyancy Controlled Drifting Sensor Platform

Funding for the research and development work has been secured from both public agencies and private industry, including the National Science Foundation (NSF), the Federal Highway Administration (FHWA), the New York State Department of Transportation (NYSDOT),  the New York State Energy Research and Development Authority (NYSERDA), the Syracuse Center of Excellence Collaborative Activities for Research and Technology Innovation (CARTI), General Motors Powertrain (GMPT), John Deere, Cooper Crouse-Hinds (CCH), General Electric (GE), and Atkins Global.

For more information, contact Dr. Janoyan at kjanoyan@clarkson.edu.

CAMP Professor Yongming Liu Models Probabilistic Multi-Scale Fatigue Damage of Metals and Composites

Professor Yongming Liu, of Clarkson’s Department of Civil and Environmental Engineering, is investigating the fatigue damage prognosis of materials and structures. This topic is still a challenging problem despite tremendous progress made during the past several decades. Fatigue damage accumulation is a multi-scale phenomenon, which involves very different spatial and temporal scales. In addition, huge uncertainties are associated with the fatigue damage accumulation. The development of a general methodology for probabilistic multi-scale fatigue damage modeling would significantly enhance the nation’s aviation safety, the infrastructure risk assessment, and the rulemaking of governmental authorities. Professor Liu is currently leading several projects related to probabilistic fatigue damage prognosis of materials and structures. These projects focus on the different material systems and different structural applications, which are funded by various governmental agencies, such as NASA, the Federal Aviation Administration, the National Science Foundation, and the Air Force Office of Scientific Research (AFOSR).

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High Strength HISC-Resistant Bolt Materials for Seawater/Cathodic Protection Service

 CAMP Professors Daryush Aidun, Ian Suni, and David Morrison, along with graduate students Marissa LaCoursiere and Josiah Jebaraj, have initiated a research project to develop high strength bolt materials that resist hydrogen-induced stress cracking (HISC) when subjected to a cathodic potential in a seawater environment.  The project is sponsored by General Electric Oil & Gas / Vetco Gray.  The offshore oil and gas environment is very harsh with highly corrosive seawater and wide extremes of temperature.  General corrosion issues can usually be addressed through alloy selection and cathodic protection.  However, cathodic protection causes the introduction of hydrogen into the material that can lead to hydrogen embrittlement.  By analyzing the effects of metallurgical variables on hydrogen diffusion and fracture processes, the team will identify improved alloys for use in this environment.

HISC

Graduate student Marissa LaCoursiere prepares a specimen for a slow strain rate hydrogen embrittlement test.