Location

La Jolla, CA

Start Date

1-1-1989 12:00 AM

Description

Voids or porosity in carbon fiber reinforced plastics (CFRP) caused by improper curing, moisture in the prepreg and other reasons can degrade the mechanical properties of the composite components [1–3]. Voids caused by trapped air in the layup process or volatile gas released in the curing process tend to occur at the interface between the plies of unidirectional prepregs and are usually elongated along the adjacent fiber directions [4]. On the other hand, voids in woven composites tend to be more spherical. Matrix dominated strengths such as transverse tensile and interlaminar shear strengths are affected the most by the presence of porosity. Quantitative nondestructive evaluation (QNDE) methods for the detection and characterization of porosity in composites are therefore highly desirable.

Volume

8B

Chapter

Chapter 8: Composites

Section

Composites—Properties

Pages

1567-1573

DOI

10.1007/978-1-4613-0817-1_197

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Ultrasonic Velocity Change and Dispersion Due to Porosity in Composite Laminates

La Jolla, CA

Voids or porosity in carbon fiber reinforced plastics (CFRP) caused by improper curing, moisture in the prepreg and other reasons can degrade the mechanical properties of the composite components [1–3]. Voids caused by trapped air in the layup process or volatile gas released in the curing process tend to occur at the interface between the plies of unidirectional prepregs and are usually elongated along the adjacent fiber directions [4]. On the other hand, voids in woven composites tend to be more spherical. Matrix dominated strengths such as transverse tensile and interlaminar shear strengths are affected the most by the presence of porosity. Quantitative nondestructive evaluation (QNDE) methods for the detection and characterization of porosity in composites are therefore highly desirable.