Practical, Cost-Effective, Nondestructive Evaluation Technique for Composite Materials

Award Information
Agency:
Department of Defense
Branch
Navy
Amount:
$72,000.00
Award Year:
1996
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Agency Tracking Number:
32732
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Tpl, Inc.
3768 Hawkins Street, NE, Albuquerque, NM, 87109
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
William F. Hartman, Ph.d.
(505) 345-5668
Business Contact:
() -
Research Institution:
n/a
Abstract
The mechanical characteristics of advanced composite materials are strongly affected by physical parameters such as ply orientation, thickness of the layers, and homogeneity of the fibers. Although proper material integrity is critical for performance, many factors influencing mechanical properties cannot be detected by visual inspection Small anomalies or incipient degradations including delaminations or heat damage represent a detection problem for ultrasonics. Research with techniques such as ultrasonics, backscattered X-ray, eddy current, thermography, DRIFT and LPF spectroscopies, acousto-ultrasonics, and hardness testing have not resulted in a demonstration of the ability to correlate nondestructive testing results with loss of strength of the material. Recent research at TPL indicates that dielectric spectroscopy is able to detect physical and chemical properties that result from improper fabrication or thermal degradation, and may be able to determine the internal structure at both the macroscopic and microscopic levels. The results of Phase I are expected to establish that dielectric spectroscopy is significantly more sensitive for the detection of physical characteristics affecting mechanical properties than other techniques such as ultrasonics. It will also show that the new NDE technique can be used both during the manufacturing process and during in service inspection USI) of aircraft.

* information listed above is at the time of submission.

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