Failure criteria and acoustic emission as applied to composite materials

• Main Author: Campbell, I
• Format: Others
• Language: en
• Published: 2017
• Subjects: Composite materials > Testing; Acoustic emission; Fracture mechanics; Fibrous composites > Testing
• Online Access: Campbell, I. (1992) Failure criteria and acoustic emission as applied to composite materials, University of Witwatersrand, Johannesburg, <http://wiredspace.wits.ac.za/handle/10539/22068>; http://hdl.handle.net/10539/22068

A dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, Johannesburg, in fulfillment of the requirements for the degree of Master of science in Engineering. Johannesburg, 1992. === This project involves the comparison of different failure criteria with experimental results for fibre composite materials, and investigates the usefulness of acoustic emission in composite testing. Three sets of specimens were tested to failure in tension. The specimens had various ply orientations and were tested using acoustic emission to determine ply failures. Carbon and glass fibre reinforced epoxy pre-impregnated specimens were used. The testing machine was an ESH testing machine, and a physical Acoustics corporation computer and data acquisition unit were used to record data from a piezo-electric sensor. Suitable failure criteria should be chosen on the basis of ply orientation and material type (eg fibre stiffness), a combination of criteria being used if necessary. Acoustic emission was successfully used to detect ply failure in multi-layered laminates. === AC2017