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Adaptive shape functions and internal mesh adaptation for modelling progressive failure in adhesively bonded joints
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Stapleton, Scott Gries Sr., Thomas Pineda, Evan J. Waas, Anthony M. |
| Copyright Year | 2014 |
| Description | Enhanced finite elements are elements with an embedded analytical solution that can capture detailed local fields, enabling more efficient, mesh independent finite element analysis. The shape functions are determined based on the analytical model rather than prescribed. This method was applied to adhesively bonded joints to model joint behavior with one element through the thickness. This study demonstrates two methods of maintaining the fidelity of such elements during adhesive non-linearity and cracking without increasing the mesh needed for an accurate solution. The first method uses adaptive shape functions, where the shape functions are recalculated at each load step based on the softening of the adhesive. The second method is internal mesh adaption, where cracking of the adhesive within an element is captured by further discretizing the element internally to represent the partially cracked geometry. By keeping mesh adaptations within an element, a finer mesh can be used during the analysis without affecting the global finite element model mesh. Examples are shown which highlight when each method is most effective in reducing the number of elements needed to capture adhesive nonlinearity and cracking. These methods are validated against analogous finite element models utilizing cohesive zone elements. |
| File Size | 477996 |
| Page Count | 28 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140017778 |
| Archival Resource Key | ark:/13960/t1gj4h122 |
| Language | English |
| Publisher Date | 2014-09-01 |
| Access Restriction | Open |
| Subject Keyword | Computational Mechanics Finite Element Method Adhesive Bonding Shape Functions Thickness Cohesion Adhesives Bonded Joints Mathematical Models Failure Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
