Fracture Criteria of Fibrous Laminated Composites Under In-Plane Multidirectional Loading

[+] Author and Article Information
J. Tirosh

Technion—Israel Institute of Technology, Haifa 32000, Israel

P. Mast, L. Beaubien, D. Mulville, S. Sutton, I. Wolock

Mechanics of Materials Branch, Ocean Technology Division, U.S. Naval Research Laboratory, Washington, D.C. 20375

J. Appl. Mech 47(3), 563-569 (Sep 01, 1980) (7 pages) doi:10.1115/1.3153732 History: Received October 01, 1979; Revised March 01, 1980; Online July 21, 2009


A study on the validity of various fracture criteria of angle-ply-laminated composites is presented for in-plane loading. Special emphasis is given to the vectorial presentation of the J -integral as a suitable candidate for fracture characterization of composites under general combined loading. The combined loading which is composed of a simultaneous tension, shear and in-plane bending in any desired proportion, has been produced in a highly computerized fashion by a specially devised apparatus at the U.S. Naval Research Laboratory. The fracture data of several angle ply laminates of carbon/epoxy composite (T300/5208) result from prescribing the foregoing three combined radial loading until fracture. Aided by numerical stress analysis (finite-element program) the data points are cast into more well-known descriptions; namely, crack-opening displacement versus crack-sliding displacement. Mode-I stress-intensity factor (KI ) versus Mode-II stress-intensity factor (KII ) and energy-release rate vector Jx versus Jy . The main outcome is that the data displayed on the J-integral plane have a highly distinctive nature of aligning the data points along straight lines, thus a clear discrimination between the fracture properties of different angle-ply laminates can be characterized by only two parameters. The ability to infer fracture conditions in subcomponents from tests on small coupons is assessed.

Copyright © 1980 by ASME
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