Safety enhancement of composites via periodic proof testing
Woodward, Joseph H.
Wu, Edward M.
Lindsey, Gerald H.
MetadataShow full item record
The development of new composite materials, which lack the historical field data base, has led to the need for an accelerated life testing method applicable to composites. Accelerated life testing by increasing the sustained stress levels requires the modeling and validation of a strength-life relation. Proof testing of composite fibers by over-loading is one step in the understanding of the relationship. It is also important in the reliability and safety assurance in deployment of composite structures. A parametric study examined the strength-life relation of composite fibers and a methodology to analyze the fiber failures after proof testing. The fiber statistical strength was modeled by a probability of failure model while a deterministic approach was taken considering individual fibers and the associated life reduction each fiber experienced during the proof testing procedure. Also studied was the distribution of the first failure to occur after proof testing in order to understand the effects of the sustained load and the proof load on fiber life.
Approved for public release; distribution is unlimited.
Showing items related by title, author, creator and subject.
Johnson, Eric P. (Monterey, California. Naval Postgraduate School, 1991-06);Utilization of composites in critical design applications requires an extensive engineering experience data base which is generally lacking, especially for rapidly developing constituent fibers. As a supplement, an accurate ...
Engelbert, Carl Robert (Monterey, California: Naval Postgraduate School, 1990-06);The increased use of composite materials in Navy Applications brings with it the need to know quantitatively the reliability of composite structures. Traditional methods of reliability prediction cannot be used. Therefore, ...
Linnander, Robert James (Monterey, California. Naval Postgraduate School, 1974-06);Most advanced composite materials in use today consist of a single type of reinforcing fiber embedded in a matrix. There are possible advantages, however, in a system which used multiple types of reinforcing fibers. ...