Location

La Jolla, CA

Start Date

1-1-1989 12:00 AM

Description

The potential of ultrasonic polar backscatter measurements for detecting and characterizing porosity in composite laminates has been investigated in a number of laboratories[l–l1]. The objective of this study was to evaluate the influence of the nature of the composite’s surface on such measurements. The deleterious effects of bleeder cloth impressions, previously noted by Bar-Cohen[12], led to the hypothesis that the periodic surface features due to bleeder cloth impressions remaining after the cure process contribute significantly to the received backscattered signal, possibly masking the anisotropy of backscatter which is used to estimate porosity.

Volume

8B

Chapter

Chapter 8: Composites

Section

Composites—Properties

Pages

1581-1587

DOI

10.1007/978-1-4613-0817-1_199

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Effects of Bleeder Cloth Impressions on the Use of Polar Backscatter to Detect Porosity

La Jolla, CA

The potential of ultrasonic polar backscatter measurements for detecting and characterizing porosity in composite laminates has been investigated in a number of laboratories[l–l1]. The objective of this study was to evaluate the influence of the nature of the composite’s surface on such measurements. The deleterious effects of bleeder cloth impressions, previously noted by Bar-Cohen[12], led to the hypothesis that the periodic surface features due to bleeder cloth impressions remaining after the cure process contribute significantly to the received backscattered signal, possibly masking the anisotropy of backscatter which is used to estimate porosity.