Location

Brunswick, ME

Start Date

1-1-1997 12:00 AM

Description

The objectives in this study were to determine the through-thickness elastic constant of fiber-epoxy/metal composites with ultrasonic measurements and determine the elastic constants of the constituent layers. The specimens that we studied consist of alternating layers of aluminum (2024 T3) and fiber-epoxy [1], all of which are 200 to 300 μm thick. As Figure 1 indicates the outer two layers of the composite are aluminum, so that there is always one additional layer of aluminum in the composite. The fiber-epoxy layers consist of a unidirectional layup of aramid fibers for the aramid-epoxy/aluminum specimens. For the glass-epoxylaluminum specimen, the fiber-epoxy layers consist of two sublayers of unidirectional fibers where the fibers of one sublayer lie at 90° with respect to the other sublayer. Because the fibers of both sublayers are perpendicular to the transmitting transducer, the ultrasound perceives the two sublayers as a single layer.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

16B

Chapter

Chapter 5: Engineered Materials

Section

Composites

Pages

1115-1122

DOI

10.1007/978-1-4615-5947-4_145

Language

en

File Format

application/pdf

Share

COinS
 
Jan 1st, 12:00 AM

Through-Thickness Elastic Constant for Aramid-Epoxy/Aluminum Composite Materials

Brunswick, ME

The objectives in this study were to determine the through-thickness elastic constant of fiber-epoxy/metal composites with ultrasonic measurements and determine the elastic constants of the constituent layers. The specimens that we studied consist of alternating layers of aluminum (2024 T3) and fiber-epoxy [1], all of which are 200 to 300 μm thick. As Figure 1 indicates the outer two layers of the composite are aluminum, so that there is always one additional layer of aluminum in the composite. The fiber-epoxy layers consist of a unidirectional layup of aramid fibers for the aramid-epoxy/aluminum specimens. For the glass-epoxylaluminum specimen, the fiber-epoxy layers consist of two sublayers of unidirectional fibers where the fibers of one sublayer lie at 90° with respect to the other sublayer. Because the fibers of both sublayers are perpendicular to the transmitting transducer, the ultrasound perceives the two sublayers as a single layer.