Abstract
An analysis of angle-ply laminated beam fracture specimens loaded in a mixed-mode bending (MMB) apparatus is presented. The analysis is based on superposition of compliance and strain-energy release rate expressions previously derived from laminated beam theory for DCB and ENF angle-ply laminate specimens. Elastic interactions between the two arms of the specimen, asymmetry in lay-up, and interlaminar shear deformation are incorporated in the analysis. It was found that the ratio between G I and G II is only slightly sensitive to ply angle in the angle-ply laminates, where G I and G II denote the mode I and mode II components of the strain energy release rate, G. The ratio G I/ G II, likewise, is only weakly dependent on crack length. An experimental study on glass/polyester quasi-unidirectional and angle-ply laminates was conducted. Specifically, [0] 6, [±30] 5 and [±45] 5 laminates with mid-plane delaminations were tested at various mode ratios ( G I/ G II). Predicted compliance values were in good agreement with experimental data. The fracture toughness, G c, increased with decreased ratio G I/ G II. G c increased with increased ply angle θ in the angle-ply laminates except for pure mode I conditions. Nonuniform and skewed crack fronts were observed for the angle-ply laminates as a result of elastic coupling in the laminate beams of the cracked region.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
