Interlaminar Fracture Toughness Characterization of Unidirectional Glass Fiber Composite (S2/913 prepreg)

Viswamurthy, SR and Siva, M and Ramachandra, HV (2013) Interlaminar Fracture Toughness Characterization of Unidirectional Glass Fiber Composite (S2/913 prepreg). Technical Report. CSIR-NAL, CSIR-NAL, Bangalore.

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Abstract

Vulnerability to delaminations is one of the major weaknesses of advanced laminated composite structures. Knowledge of a laminated composite material’s resistance to interlaminar fracture is useful for product development and material selection. Interlaminar fracture toughness is a measure of the material’s resistance for interlaminar crack/delamination growth and is known to be mode dependent. The scope of this study is to measure the interlaminar fracture toughness of unidirectional glass fiber composite (S2/913 prepreg system) under (a) Mode I loading, (b) Mode II loading, and (c) Combination of Mode I & Mode II loading. This report presents a detailed description of the tests and their results. Glass fiber composite specimens from S2/913 prepreg system processed by autoclave molding technique were tested as part of this study. The standard double cantilever beam test (ASTM D 5528) was followed for measuring pure Mode-I interlaminar fracture toughness. The 3-point bend end notched flexure test (3-ENF) was used to measure pure mode-II interlaminar fracture toughness. Fracture toughness data obtained from both mode-I and mode-II tests are compared with published data of other polymer matrix composites used in the aerospace industry. The standard mixed mode bending test (ASTM D 6671) was followed for measurement of interlaminar fracture toughness under mixed mode-I mode-II loading. The fracture toughness contour showing the variation of fracture toughness with mode mixture is plotted and compared with other composite materials found in literature. In future, numerical simulations / finite element analyses can use this experimental data for prediction of delamination growth.

Item Type: Monograph (Technical Report)
Uncontrolled Keywords: Interlaminar fracture toughness; Mode I; Mode II; Mixed mode;
Subjects: CHEMISTRY AND MATERIALS > Composite Materials
ENGINEERING > Structural Mechanics
Depositing User: Dr. Viswamurthy S R
Date Deposited: 26 Jun 2013 09:57
Last Modified: 26 Jun 2013 09:57
URI: http://nal-ir.nal.res.in/id/eprint/11734

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