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Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0009077
EISBN: 978-1-62708-177-1
...Abstract Abstract Analyzing the structure of composite materials is essential for understanding how the part will perform in service. Assessing fiber volume variations, void content, ply orientation variability, and foreign object inclusions helps in preventing degradation of composite...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0009078
EISBN: 978-1-62708-177-1
... Fig. 1 Glass fabric composite that has high void content. Void areas are due to residual solvent from the prepregging process. Bright-field illumination, 10× objective Fig. 2 Laminate made with unidirectional carbon fiber prepreg and woven carbon fabric prepreg plies. Voids are shown...
Series: ASM Handbook
Volume: 9
Publisher: ASM International
Published: 01 December 2004
DOI: 10.31399/asm.hb.v09.a0009083
EISBN: 978-1-62708-177-1
.... In these micrographs, there is evidence of some scratching on the polished surface. This is due to the high void content that entrapped polishing particles, which are carried to the next step. In some cases, even the use of ultrasonic cleaning cannot remove all of the entrapped polishing particles from the previous...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003235
EISBN: 978-1-62708-199-3
..., and antenna covers (radomes). This article focuses on the microwave inspection methods that were subsequently developed for evaluation of moisture content in dielectric materials; thickness measurements of thin metallic coatings on dielectric substrates; and detection of voids, delaminations, macroporosity...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003235
EISBN: 978-1-62708-199-3
... covers (radomes). This article focuses on the microwave inspection methods that were subsequently developed for evaluation of moisture content in dielectric materials; thickness measurements of thin metallic coatings on dielectric substrates; and detection of voids, delaminations, macroporosity...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003045
EISBN: 978-1-62708-200-6
... deviations from specification requirements. These conditions may or may not have been experienced by other parts being processed. The usual measurements of flexural strength and modulus, short beam shear strength, fiber volume, void content, and degree of cure are very difficult to relate to part...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003476
EISBN: 978-1-62708-195-5
... functions of a matrix material. Composites fabricated with these polymers exhibited high void contents, poor fiber translation efficiencies, inferior elevated-temperature mechanical properties, and inferior thermooxidative stabilities. Little progress was made in developing polymers with improved...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003439
EISBN: 978-1-62708-195-5
... are included in this level, although they are sometimes included in the constituent level or even broken out into a separate level. Key properties include fiber areal weight, matrix content, void content, cured ply thickness, lamina tensile strengths and moduli, lamina compression strengths and moduli...
Series: ASM Handbook
Volume: 21
Publisher: ASM International
Published: 01 January 2001
DOI: 10.31399/asm.hb.v21.a0003463
EISBN: 978-1-62708-195-5
... it is used to determine the apparent strength and modulus of the reinforcing fibers in the composite. Void content is one indication of the quality of the fabrication process and resulting material. Standard test methods ( Ref 13 , 14 ) have been established for both metallic- and organic-matrix...
Series: ASM Handbook
Volume: 20
Publisher: ASM International
Published: 01 January 1997
DOI: 10.31399/asm.hb.v20.a0002465
EISBN: 978-1-62708-194-8
... coupling agent at 1 to 2% (by weight) on the fibers can help the laminate become stable, uniform, continuous, low in void content, and homogenous, thereby enhancing properties up to 25%. In addition, a filler can modify the modulus, strength, resin flow (viscosity), uniformity, ease of processing...
Book Chapter

By John E. Moalli