Simultaneous moduli measurement of elastic materials at elevated temperatures using an ultrasonic waveguide method
Suresh Periyannan1, Krishnan Balasubramaniam1
1Centre for Non Destructive Evaluation and Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai 600 036, India.
The Review of Scientific Instruments
|December 3, 2015
Summary
This study introduces a new ultrasonic method to measure elastic moduli (Young
Area of Science:
- Materials Science
- Solid Mechanics
- Ultrasonics
Background:
- Accurate measurement of elastic moduli (E and G) as a function of temperature is crucial for material design and performance analysis.
- Conventional methods for determining temperature-dependent elastic moduli are often time-consuming and labor-intensive.
- Existing techniques may struggle with simultaneous measurement of both Young's and shear moduli, especially at elevated temperatures.
Purpose of the Study:
- To present a novel, efficient technique for simultaneously measuring Young's modulus (E) and shear modulus (G) of elastic isotropic materials.
- To validate the technique's capability across a wide temperature range (35°C–1200°C).
- To offer a reduced-time and effort alternative to conventional methods for assessing temperature-dependent elastic properties.
Main Methods:
- Utilizing two co-generated ultrasonic guided wave modes (L(0,1) and T(0,1)) with a single transducer in a pulse-echo mode.
- Employing waveguides with specific embodiments (e.g., a bend) at one end and a transducer at the other.
- Measuring the time-of-flight difference of reflected guided waves within a temperature-controlled furnace to determine material properties.
Main Results:
- Successfully demonstrated simultaneous measurement of Young's modulus (E) and shear modulus (G) as a function of temperature.
- Experimental results for various materials showed excellent agreement with literature values.
- The technique proved effective over a broad temperature range from 35°C to 1200°C.
Conclusions:
- The developed ultrasonic guided wave technique offers an efficient and accurate method for determining temperature-dependent elastic moduli.
- This novel approach significantly reduces the time and effort required compared to traditional measurement techniques.
- The method is suitable for a wide range of materials and temperatures, providing valuable data for material science applications.
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