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Dispersion of waves in composite laminates with transverse matrix cracks, finite element and plate theory computations
KTH, Superseded Departments, Solid Mechanics.
KTH, Superseded Departments, Solid Mechanics.ORCID iD: 0000-0002-0307-8917
1998 (English)In: Journal of applied mechanics, ISSN 0021-8936, E-ISSN 1528-9036, Vol. 65, no 3, 588-595 p.Article in journal (Refereed) Published
Abstract [en]

Dispersion relations for laminated composite plates with transverse matrix cracks have been computed using two methods. In the first approach it is assumed that the matrix cracks appear periodically and hence it is possible to consider a periodic cell of the the structure using Bloch-type boundary conditions. This problem was formulated in complex notation and solved in a standard finite element program (ABAQUS) using two identical finite element meshes, one for the real part and one for the imaginary part of the displacements. The two meshes were coupled by the boundary conditions on the cell. The code then computed the eigenfrequencies of the system for a given wave vector. It was then possible to compute the phase velocities. The second approach used may be viewed as a two step homogenization. First the cracked layers are homogenized and replaced by weaker uncracked layers and then the standard first-order shear-deformation laminate theory is used to compute dispersion relations. Dispersion relations were computed using both methods for three glass-fiber/epoxy laminates ([0/90](2), [0/90](2) and [0/45/-45](s) with cracks in the 90 and +/-45 deg plies). For the lowest flexural mode the difference in phase velocity between the methods was less then five percent for wavelengths longer than two times the plate thickness. For the extensional merle a wavelength of ten plate thicknesses gave a five percent difference.

Place, publisher, year, edition, pages
1998. Vol. 65, no 3, 588-595 p.
Keyword [en]
Boundary conditions, Composite structures, Computer software, Cracks, Eigenvalues and eigenfunctions, Epoxy resins, Finite element method, Glass fiber reinforced plastics, Laminated composites, Shear deformation, Vectors, First-order shear-deformation laminate theory, Software package ABAQUS
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-25490DOI: 10.1115/1.2789099ISI: 000076988900005OAI: diva2:358757
QC 20101025Available from: 2010-10-25 Created: 2010-10-25 Last updated: 2010-10-25Bibliographically approved

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