Open Access. Powered by Scholars. Published by Universities.®

Engineering Science and Materials Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 4 of 4

Full-Text Articles in Engineering Science and Materials

Predicting Dynamic Modulus Of Asphalt Mixture Using Data Obtained From Indirect Tension Mode Of Testing, Parnian Ghasemi, Shibin Lin, Derrick K. Rollins, R. Christopher Williams Jan 2019

Predicting Dynamic Modulus Of Asphalt Mixture Using Data Obtained From Indirect Tension Mode Of Testing, Parnian Ghasemi, Shibin Lin, Derrick K. Rollins, R. Christopher Williams

Chemical and Biological Engineering Publications

Understanding stress-strain behavior of asphalt pavement under repetitive traffic loading is of critical importance to predict pavement performance and service life. For viscoelastic materials, the stress-strain relationship can be represented by the dynamic modulus. The dynamic modulus test in indirect tension mode can be used to measure the modulus of each specific layer of asphalt pavements using representative samples. Dynamic modulus is a function of material properties, loading, and environmental conditions. Developing predictive models for dynamic modulus is efficient and cost effective. This article focuses on developing an accurate Finite Element (FE) model using mixture elastic modulus and asphalt binder ...


Investigation On The Damage Localization In A Pipe Using Torsional Guided Waves And Sensor Array Reconstruction Techniques, Erick Rojas, Karla Fernandez, Arturo Baltazar, Jorge Aranda Jan 2016

Investigation On The Damage Localization In A Pipe Using Torsional Guided Waves And Sensor Array Reconstruction Techniques, Erick Rojas, Karla Fernandez, Arturo Baltazar, Jorge Aranda

Review of Progress in Quantitative Nondestructive Evaluation

Continuous monitoring for damage detection and localization on large fluid filled pipe-like structures is needed. To address this problem we propose the use of a Macro Fiber Composite (MFC) sensor to generate the first order torsional mode and to detect scatter signals from the discontinuities by an EMAT sensor positioned in various locations on the surface of the structure to simulate an array of sensors. Signals are post-processed with a developed algorithm based on entropy and arrival time. Numerical results were obtained for simulated signals and experimentally tested on a stainless steel pipe A-36 (43.6 and 48.2 mm ...


Subsurface Inclusion Quantification Using Multi-Frequency Ultrasonic Surface Waves, Musa Norouzian, Joseph A. Turner, Allen J. Fuller, Brent M. Wilson Jan 2016

Subsurface Inclusion Quantification Using Multi-Frequency Ultrasonic Surface Waves, Musa Norouzian, Joseph A. Turner, Allen J. Fuller, Brent M. Wilson

Review of Progress in Quantitative Nondestructive Evaluation

Rolling contact fatigue (RCF) is one of the major sources of subsurface-initiated spalling in bearing components. These types of spalls initiate in regions where microcracks are formed due to a localized increase in stress from inclusions near the surface. Ultrasonic bulk inspection is a powerful method to detect defects in a large volume of steel. However, inclusions near the surface of a sample can elude detection because reflections from the inclusion can be masked by reflections from the sample surface. This limitation can be eliminated if ultrasonic surface wave methods are used for inspection. Surface waves have material displacements localized ...


Localization And Characterization Of Fatigue Cracks Around Fastener Holes Using Spherically Focused Ultrasonic Probes, Deborah Hopkins, Marvin Datuin, John Aldrin, Mark Warchol, Lyudmila Warchol, David Forsyth, Charlie Buynak, Eric Lindgren Jan 2016

Localization And Characterization Of Fatigue Cracks Around Fastener Holes Using Spherically Focused Ultrasonic Probes, Deborah Hopkins, Marvin Datuin, John Aldrin, Mark Warchol, Lyudmila Warchol, David Forsyth, Charlie Buynak, Eric Lindgren

Review of Progress in Quantitative Nondestructive Evaluation

Results are presented from laboratory experiments and simulations designed to determine the ability to localize and characterize fatigue cracks around fastener holes using spherically fo-cused ultrasonic (UT) probes for shear-wave inspections. In designing and evaluating inspection protocols, the number of cases that can be studied through laboratory experiments is severely limited by cost and time constraints. Simulations therefore stand to play a significant role in the design and optimization of inspection strategies for those conditions that can be accurately mod-eled. Moving from benchmark studies for relatively simple geometries toward more realistic conditions creates significant challenges. For shear-wave inspections of fastener ...