#### Event Title

Determination of the Elastic Constants of Composites Through the Inversion of Leaky Lamb Wave Data

#### Location

Brunswick, ME

#### Start Date

1-1-1990 12:00 AM

#### Description

Analysis and prediction of the response of composite laminates to external loads are essential for the design of composite structures. This in turn requires a precise knowledge of their mechanical properties including their constitutive behavior. It is reasonable to assume that, in the bulk, the overall behavior of unidirectional graphite/epoxy composites is the same as that of a homogeneous, transversely isotropic material with its symmetry axis along the fiber direction. Then the linear elastic response of the material can be described by means of five elastic constants. If the values of these constants can be determined, then the stress analysis of a laminate with a given number and stacking order of the laminae can, in principle, be carried out. However, the measurement of the elastic constants by conventional, destructive techniques is difficult and often, inaccurate. Thus, the availability of alternative, preferably nondestructive methods, for the determination of the elastic costants of the material would be extremely helpful

#### Book Title

Review of Progress in Quantitative Nondestructive Evaluation

#### Volume

9A

#### Chapter

Chapter 1: Fundamentals of Classical Techniques

#### Section

A: Elastic Wave Scattering and Flaw Sizing

#### Pages

109-116

#### DOI

10.1007/978-1-4684-5772-8_12

#### Copyright Owner

Springer-Verlag US

#### Copyright Date

January 1990

#### Language

en

#### File Format

application/pdf

Determination of the Elastic Constants of Composites Through the Inversion of Leaky Lamb Wave Data

Brunswick, ME

Analysis and prediction of the response of composite laminates to external loads are essential for the design of composite structures. This in turn requires a precise knowledge of their mechanical properties including their constitutive behavior. It is reasonable to assume that, in the bulk, the overall behavior of unidirectional graphite/epoxy composites is the same as that of a homogeneous, transversely isotropic material with its symmetry axis along the fiber direction. Then the linear elastic response of the material can be described by means of five elastic constants. If the values of these constants can be determined, then the stress analysis of a laminate with a given number and stacking order of the laminae can, in principle, be carried out. However, the measurement of the elastic constants by conventional, destructive techniques is difficult and often, inaccurate. Thus, the availability of alternative, preferably nondestructive methods, for the determination of the elastic costants of the material would be extremely helpful