Title

Damping Ratio Measurements In Kevlar Sandwich Samples

Report Number

WL-TR-91-3078 Volume III, p. IBD-1

Creator

Balis-Crema, L.

Agneni, A.

Castellani, A.

Corporate Author

University of Rome

Date Issued

1991

Date Modified

1991-08

Extent

1

Identifier

ADA241313

Format

1 online resource

Abstract

Unlike some structural aerospace materials, as for instance carbon fibers, Kevlar
composites present high damping ratios. This characteristic seems important in
the structural design of satellites and large spacecraft. Besides the use of Kevlar
sandwich structures is particularly interesting because of their high specific stiffness.
This paper presents the experimental results of damping ratio measurements
derived from several sandwich samples, characterized by different skins, fabric and
laminate with different lay-up.
Damping ratios are evaluated by using different techniques and a comparison is
discussed. The effects of frequency and temperature - in the range from the room
value up to 100 Centigrade - on the damping ratio values are also considered.
A model (based on an energetic approach), that permits a theoretical estimate of
the damping ratio in sandwich samples is presented. Finally a comparison between
the experimental and the predicted values is carried out.
FULL PAPER NOT AVAILABLE FOR
PUBLICATION

Description

Unlike some structural aerospace materials, as for instance carbon fibers, Kevlar
composites present high damping ratios. This characteristic seems important in
the structural design of satellites and large spacecraft. Besides the use of Kevlar
sandwich structures is particularly interesting because of their high specific stiffness.
This paper presents the experimental results of damping ratio measurements
derived from several sandwich samples, characterized by different skins, fabric and
laminate with different lay-up.
Damping ratios are evaluated by using different techniques and a comparison is
discussed. The effects of frequency and temperature - in the range from the room
value up to 100 Centigrade - on the damping ratio values are also considered.
A model (based on an energetic approach), that permits a theoretical estimate of
the damping ratio in sandwich samples is presented. Finally a comparison between
the experimental and the predicted values is carried out.
FULL PAPER NOT AVAILABLE FOR
PUBLICATION

Distribution Classification

1

Distribution Conflict

No

DTIC Record Exists

No

Illinois Tech Related

No

Photo Quality

Not Needed

Report Availability

Full text available

Type

article

Is Part Of

Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)