Fracture Mechanics Analysis of a Laminated Composite Beam Containing Edge Delamination Under Mixed-Mode Bending
碩士 === 國立成功大學 === 機械工程學系碩博士班 === 101 === The problem of an orthotropic double cantilever beam (DCB) under mixed-moded loading is studied in this thesis. The fracture mechanics parameters including the strain energy release rate and the stress intensity factors for the crack tip is solved by using be...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2013
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| Online Access: | http://ndltd.ncl.edu.tw/handle/14983698898561686549 |
| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 101 === The problem of an orthotropic double cantilever beam (DCB) under mixed-moded loading is studied in this thesis. The fracture mechanics parameters including the strain energy release rate and the stress intensity factors for the crack tip is solved by using beam on elastic foundation theory with the modification to consider shear effect by using Lekhnitskii’s anisotropic stress potential. In addition, the relationship between compliance and crack length is also derived. The strain energy release rate and the phase angle are obtained as a function of the DCB’s compliance. The analytical solutions are verified by comparing to finite element solutions for cases of homogeneous and multilayered orthotropic beam. Based on the analytical solutions obtained in this study, an experimental setup is proposed for characterizing the fatigue growth rate of the DCB crack under mixed-moded loading with a constant phase angle, which is achieved by continuously varying the loading ratio on the cantilever arms according to the DCB compliance reading.
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