Strength and Failure Analysis of Composite Laminates with Holes at Room and Elevated Temperatures.
Abstract
The composite material community has been interested in developing a matrix fiber combination which could improve the ability of a laminate in resisting interlaminate fracture impact loading to a greater degree than in the past and ultimately, improve upon the toughness of the composite material. Recently, a matrix has been manufactured that appears to assist in obtaining these goals. This material is a thermoplastic resin referred to as polyetheretherkeytone (Peek). A review of literature produced very little information related to Gr/Peek. Thus an experimental study reported here-in was conducted to investigate the high temperature strength (tension and compression) of Gr/Peek and Gr/Epoxy laminates with holes. The results were then used to determine the parameters necessary to predict trends incorporating the point stress, average stress failure criteria and the three parameter curve fir criterion. The comparison of predicted and experimental failure stress are shown graphically. The failure modes of Gr/Peek and Gr/Ep are analyzed with the help of electron scanning micrographs. It is seen that an interface degradation exists for Gr/Peek (Polyetheretherkeytone) at higher temperatures. An effect of shear crippling similar to that of Gr/Ep is observed in compression failure of Gr/Peek. Originator-supplied keywords include: Composite Materials, Notch Sensitivity, Fracture ((Mechanics), GR(Graphite), Strength (Mechanics), Theses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1984
- Accession Number
- ADA153263
Entities
People
- B. U. Malik
Organizations
- Air Force Institute of Technology