Analytical and numerical modeling of the mixed-mode delamination process for composite moment-loaded double cantilever beams
| Autor: | Giorgio Zavarise, Francesco Tornabene, Rossana Dimitri |
|---|---|
| Přispěvatelé: | Dimitri, Rossana, Tornabene, Francesco, Zavarise, Giorgio |
| Rok vydání: | 2018 |
| Předmět: |
Timoshenko beam theory
Cantilever Materials science Mixed-mode fracture mechanic Differential equation Interfaces Ceramics and Composite 02 engineering and technology Stress (mechanics) 0203 mechanical engineering Boundary value problem Composite delamination Double cantilever beam Civil and Structural Engineering Strain energy release rate Linear elastic fracture business.industry GDQ method Numerical analysis Delamination Structural engineering Mechanics Mixed-mode fracture mechanics Interface 021001 nanoscience & nanotechnology Finite fracture mechanics 020303 mechanical engineering & transports Adhesive interface Ceramics and Composites Finite fracture mechanic 0210 nano-technology business |
| Zdroj: | Composite Structures. 187:535-553 |
| ISSN: | 0263-8223 |
| DOI: | 10.1016/j.compstruct.2017.11.039 |
| Popis: | This work aims at studying the mixed-mode delamination process in Moment-Loaded Double Cantilever Beam (MLDCB) specimens. The delamination problem is addressed both analytically and numerically, while considering the interfaces as an assemblage of two sublaminates partly bonded together by an elastic interface. Such interface is modeled as a continuous distribution of elastic-brittle springs acting along the normal and/or tangential direction depending on the interfacial mixed-mode condition. The Timoshenko’s beam theory is here applied to determine the governing equations of the differential problem and the associated boundary conditions, whose solution is not straightforward. The Generalized Differential Quadrature (GDQ) method is then applied as numerical tool to solve directly the differential equations of the problem in a strong form. The capability of the proposed numerical approach is first exploited through a comparative evaluation of the results with the analytical predictions resting on a suitable change of variables for delamination test specimens. The local and global response is determined, in terms of interfacial stresses, internal forces and displacements, as well as in terms of compliance, energy release rate, mode mixity angle, and moment-rotation curves. A further check of the proposed numerical method is performed with respect to a Finite Fracture Mechanics (FFM) criterion, which is able to join both stress- and energy-based approaches. A good agreement between results confirms the good feasibility of the GDQ method when studying delamination phenomena occurring within composite materials or laminated joints, usually subjected to mixed-mode conditions. |
| Databáze: | OpenAIRE |
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