Loading...
Please wait, while we are loading the content...
Similar Documents
Direct formulation of a 4-node hybrid shell element with rotational degrees of freedom
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Aminpour, Mohammad A. |
| Copyright Year | 1990 |
| Description | A simple 4-node assumed-stress hybrid quadrilateral shell element with rotational or drilling degrees of freedom is formulated. The element formulation is based directly on a 4-node element. This direct formulation requires fewer computations than a similar element that is derived from an internal 8-node isoparametric element in which the midside degrees of freedom are eliminated in favor of rotational degree of freedom at the corner nodes. The formulation is based on the principle of minimum complementary energy. The membrane part of the element has 12 degrees of freedom including rotational degrees of freedom. The bending part of the element also has 12 degrees of freedom. The bending part of the quadratic variations for both in-plane and out-of-plane displacement fields and linear variations for both in-plane and out-of-plane rotation fields are assumed along the edges of the element. The element Cartesian-coordinate system is chosen such as to make the stress field invariant with respect to node numbering. The membrane part of the stress field is based on a 9-parameter equilibrating stress field, while the bending part is based on a 13-parameter equilibrating stress field. The element passes the patch test, is nearly insensitive to mesh distortion, does not lock, possesses the desirable invariance properties, has no spurious modes, and produces accurate and reliable results. |
| File Size | 2111064 |
| Page Count | 32 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900012095 |
| Archival Resource Key | ark:/13960/t21c6wf1s |
| Language | English |
| Publisher Date | 1990-04-01 |
| Access Restriction | Open |
| Subject Keyword | Structural Mechanics Plate Theory Panels Degrees of Freedom Membranes Distortion Shells Structural Forms Invariance Variational Principles Rotation Edges Displacement Finite Element Method Stress Distribution Beams Supports Bending Strain Distribution Corners Patch Tests Cartesian Coordinates Structural Analysis 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 |
