Location

La Jolla, CA

Start Date

1-1-1991 12:00 AM

Description

The anisotropy of fibrous composite materials makes it difficult to determine their elastic constants nondestructively. The unidirectional lamina, which is the basic building block of composite laminates and structures, is treated as a quasi-homogeneous orthotropic material. Determination of material properties of the unidirectional lamina is especially important because this characterization allows prediction of the properties of any multidirectional laminate. In general, the unidirectional lamina is characterized by nine independent elastic constants. Many composite materials, however, have the additional property of transverse isotropy. In such cases the number of independent constants is reduced to five. The objective of this study is to propose a method for determining these constants ultrasonically by measuring phase velocities and critical angles.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

10B

Chapter

Chapter 6: Engineered Materials

Section

Properties of Composites

Pages

1445-1452

DOI

10.1007/978-1-4615-3742-7_40

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Nondestructive Determination of Elastic Constants of Composite Materials

La Jolla, CA

The anisotropy of fibrous composite materials makes it difficult to determine their elastic constants nondestructively. The unidirectional lamina, which is the basic building block of composite laminates and structures, is treated as a quasi-homogeneous orthotropic material. Determination of material properties of the unidirectional lamina is especially important because this characterization allows prediction of the properties of any multidirectional laminate. In general, the unidirectional lamina is characterized by nine independent elastic constants. Many composite materials, however, have the additional property of transverse isotropy. In such cases the number of independent constants is reduced to five. The objective of this study is to propose a method for determining these constants ultrasonically by measuring phase velocities and critical angles.