Location

La Jolla, CA

Start Date

1-1-1983 12:00 AM

Description

The high specific strengths attainable from composite materials can be negated by pores between the plies in the material. Classical acoustic attenuation measurements can indicate the presence of porosity if all other material properties remain constant. Even though attenuation measurements accurately predict the amount of porosity, its spatial distribution cannot be inferred from these data. To make accurate predictions of structural performance, current micromechanical models of composite materials require accurate estimates of the volume fraction of porosity and its spatial distribution. This work is an attempt to model the acoustic interactions that occur between plane compressional waves and the fiber arrays and pores in order to develop an ultrasonic technique to estimate the spatial distribution and volume fraction of porosity.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

2A

Chapter

Section 10: Ultrasonic Scattering, Reliability and Penetrating Radiation

Pages

587-594

DOI

10.1007/978-1-4613-3706-5_36

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Time-Domain First Born Approximation to Elastodynamic Backscatter from Composite Materials

La Jolla, CA

The high specific strengths attainable from composite materials can be negated by pores between the plies in the material. Classical acoustic attenuation measurements can indicate the presence of porosity if all other material properties remain constant. Even though attenuation measurements accurately predict the amount of porosity, its spatial distribution cannot be inferred from these data. To make accurate predictions of structural performance, current micromechanical models of composite materials require accurate estimates of the volume fraction of porosity and its spatial distribution. This work is an attempt to model the acoustic interactions that occur between plane compressional waves and the fiber arrays and pores in order to develop an ultrasonic technique to estimate the spatial distribution and volume fraction of porosity.