NDLI: Experimental and analytical investigation of the fracture processes of boron/aluminum laminates containing notches

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Experimental and analytical investigation of the fracture processes of boron/aluminum laminates containing notches

Content Provider	NASA Technical Reports Server (NTRS)
Author	Bigelow, C. A. Johnson, W. S. Bahei-El-din, Y. A.
Copyright Year	1983
Description	Experimental results for five laminate orientations of boron/aluminum composites containing either circular holes or crack-like slits are presented. Specimen stress-strain behavior, stress at first fiber failure, and ultimate strength were determined. Radiographs were used to monitor the fracture process. The specimens were analyzed with a three-dimensional elastic-elastic finite-element model. The first fiber failures in notched specimens with laminate orientation occurred at or very near the specimen ultimate strength. For notched unidirectional specimens, the first fiber failure occurred at approximately one-half of the specimen ultimate strength. Acoustic emission events correlated with fiber breaks in unidirectional composites, but did not for other laminates. Circular holes and crack-like slits of the same characteristic length were found to produce approximately the same strength reduction. The predicted stress-strain responses and stress at first fiber failure compared very well with test data for laminates containing 0 deg fibers.
File Size	1470402
Page Count	46
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19830025685
Archival Resource Key	ark:/13960/t40s4m58w
Language	English
Publisher Date	1983-09-01
Access Restriction	Open
Subject Keyword	Composite Materials Radiography Finite Element Method Boron Fracture Mechanics Aluminum Failure Analysis Notches Metal Matrix Composites Laminates Fibers Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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