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Full-Text Articles in Mechanical Engineering
Analysis Of Microdamage Evolution Histories In Composites, Yuris A. Dzenis, Jie Qian
Analysis Of Microdamage Evolution Histories In Composites, Yuris A. Dzenis, Jie Qian
Department of Engineering Mechanics: Faculty Publications
Evolution of microdamage in advanced composites was experimentally studied in this paper. A new method of acoustic emission (AE) analysis of histories of different damage mechanisms was formulated based on a combination of transient AE classification and multiparameter filtering. The capabilities of the method were illustrated on examples of damage evolution in several graphite/epoxy composites. Three characteristic AE waveforms with different frequency spectra were identified based on the transient analysis. Regions occupied by these waveforms in the amplitude–rise time parametric space were identified for the [0]8 and [90]16 unidirectional composites. Multiparameter filtering was applied to extract evolution histories …
Rate Effects On Mode-I Delamination Toughness Of A Graphite/Epoxy Laminated Composite, Xiangfa Wu, Yuris A. Dzenis
Rate Effects On Mode-I Delamination Toughness Of A Graphite/Epoxy Laminated Composite, Xiangfa Wu, Yuris A. Dzenis
Department of Engineering Mechanics: Faculty Publications
Mechanical properties of composite materials made of high modulus fibers and relatively low modulus polymeric matrix, such as graphite/epoxy laminated composites, are sensitive to loading rate and temperature. Generally, at fixed loading rate, when temperature increases, the fracture toughness of polymers also increases; however, it will decrease with the increase of loading rate at constant testing temperature. Rate effects on fracture toughness are of critical to understand the fracture transition from ductile to brittle of some polymers. However, there have been fewer studies of rate effects on delamination toughness of laminates compared to that of pure polymers. In the present …