A stochastic fatigue damage model for composite single lap shear joints based on Markov chains and thermoelectric stress analysis

S. Johnson*, B. S. Wei, R. Haj-Ali

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Quantitative damage detection in composite single lap joints during fatigue is difficult and not practical with many traditional experimental methods. The objective is to apply stochastic Markov chain methods to model the fatigue damage evolution in composite materials subjected to cyclic mechanical loadings and monitored by infrared thermography (IR-T) techniques. The IR signal from the surface of S2-glass/E733FR single lap joints is captured continuously during constant amplitude fatigue loadings. The IR testing has high thermal sensitivity below 10mK and the image integration is synchronized with the me-chanical loa ding. Damage metrics are developed for the composite samples based on developing delamination fronts as evaluated by the thermoelastic stress analysis (TSA) technique. The IR-TSA damage index at the last fatigue cycle is used to calibrate the Markov chain models (MCMs). The damage predictions of the MCMs are then examined at different fatigue cycles. A new method is pr oposed to construct a stochastic S-N curve utilizing the MCMs. The pr o-posed IR-TSA with MCMs is shown to be very effective in predicting the damage evolution and allowed constructing a wide-range of stochastic S-N curves for composite single lap shear joints. This study also presents a new remote sensing and non-destructive evalu ation technique combined with new statistical approaches to reduce the number of lab tests in developing inspection protocol for preventing fatigue failures.

Original languageEnglish
Title of host publicationAmerican Society for Composites - 23rd Technical Conference of the American Society for Composites 2008
Pages1375-1392
Number of pages18
StatePublished - 2008
Externally publishedYes
Event23rd Technical Conference of the American Society for Composites 2008 - Memphis, TN, United States
Duration: 9 Sep 200811 Sep 2008

Publication series

NameAmerican Society for Composites - 23rd Technical Conference of the American Society for Composites 2008
Volume2

Conference

Conference23rd Technical Conference of the American Society for Composites 2008
Country/TerritoryUnited States
CityMemphis, TN
Period9/09/0811/09/08

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