Short-wavelength buckling and shear failures for compression-loaded composite laminates
This investigation studies the short-wavelength buckling (or the microbuckling) and the interlaminar and inplane shear failures of multi-directional composite laminates loaded in uniaxial compression. A laminate model is presented that idealizes each lamina. The fibers in the lamina are modeled as a plate, and the matrix in the lamina is modeled as an elastic foundation. The out-of-plane w displacement for each plate is expressed as a trigonometric series in the half wavelength of the mode shape for laminate short wavelength buckling. Nonlinear strain-displacement relations are used. The model is applied to symmetric laminates having linear material behavior. The laminates are loaded in uniform end shortening and are simply supported. A linear analysis is used to determine the laminate stress, strain, and mode shape when short-wavelength buckling occurs. The equations for the laminate compressive stress at short wavelength buckling are dominated by matrix contributions. The effects of fiber volume fraction on the compressive stress at short-wavelength buckling is reported for a laminate with any stacking sequence and any thickness. The laminate mode shape at short-wavelength buckling is discussed. A nonlinear analysis for laminae with initial imperfections is used to determine laminate stresses and interlaminar strains.
- Research Organization:
- Delaware Univ., Newark (USA)
- OSTI ID:
- 5281797
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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