SYMPOSIA PAPER Published: 01 January 1986
STP35351S

Design Analysis and Testing for Mixed-Mode and Mode II Interlaminar Fracture of Composites

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This paper presents the design analysis and results of an experimental program that was conducted to evaluate mixed-mode and Mode II interlaminar fracture behavior of a resin matrix composite material system. A double cracked-lap-shear specimen was designed utilizing a simple, new analysis method. The specimen was made of AS4/3502 graphite/epoxy material with a [±45, 0, 90]6s quasi-isotropic balanced symmetric layup. The lap interface studied was at ±45° orientations to the loading direction. A fundamental feature of the designed specimen is its ability to be tested under net tensile and compressive loadings. The specimen exhibits mixed-mode or Mode II behavior depending on the loading direction. This paper summarizes the tension testing only. The crack growth during testing was monitored by observing the isochromatic fringes in photoelastic coatings mounted on the two lap surfaces. Preliminary results indicate that the fracture behavior follows a resistance curve. In order to assess the double cracked-lap-shear specimen data and test, a comparison was made with results obtained with single cracked-lap-shear specimens. Less scatter in the data from the double cracked-lap-shear specimens was found.

Author Information

Armanios, EA
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA
Rehfield, LW
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA
Reddy, AD
School of Aerospace Engineering, Georgia Institute of Technology, Atlanta, GA
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Details
Developed by Committee: D30
Pages: 232–255
DOI: 10.1520/STP35351S
ISBN-EB: 978-0-8031-4963-2
ISBN-13: 978-0-8031-0447-1