Translaminar Fracture Toughness Test Methods and Results from Interlaboratory Tests of Carbon/Epoxy Laminates.
Abstract
Fracture tests were performed with carbon/polymer laminates and analyzed for the purpose of developing translaminar fracture toughness test and analysis procedures. Notched specimens were tested on two types of symmetrical layups, quasi-isotropic (0/45/90) and (0/90); two carbon fiber/epoxy materials, a relatively brittle T300 fiber/976 epoxy and a tougher AS4 fiber/977-2 epoxy; two laminate thicknesses, 2-mm and 4-mm; and three specimen configurations, the standard three-point bend and compact configurations, and an extended compact specimen with arm height-to-specimen width ratio of 1.9. Stress and displacement expressions were obtained for the extended compact specimen, including those for stress intensity factor, K, and crack-mouth opening displacement, V, in terms of relative notch length, a/W, and for a/W in terms of V. Relationships for the bending stresses that control self-similar and off-axis cracking for the extended compact specimen were also derived. (MM)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1995
- Accession Number
- ADA294724
Entities
People
- Dale A. Wilson
- Harvey L. Eidinoff
- John H. Underwood
- Mark T. Kortschot
- W. R. Lloyd
Organizations
- United States Army Armament Research, Development and Engineering Center