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Dycast: a finite element program for the crash analysis of structures
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Ogilvie, P. Winter, R. Pifko, A. B. |
| Copyright Year | 1987 |
| Description | DYCAST is a nonlinear structural dynamic finite element computer code developed for crash simulation. The element library contains stringers, beams, membrane skin triangles, plate bending triangles and spring elements. Changing stiffnesses in the structure are accounted for by plasticity and very large deflections. Material nonlinearities are accommodated by one of three options: elastic-perfectly plastic, elastic-linear hardening plastic, or elastic-nonlinear hardening plastic of the Ramberg-Osgood type. Geometric nonlinearities are handled in an updated Lagrangian formulation by reforming the structure into its deformed shape after small time increments while accumulating deformations, strains, and forces. The nonlinearities due to combined loadings are maintained, and stiffness variation due to structural failures are computed. Numerical time integrators available are fixed-step central difference, modified Adams, Newmark-beta, and Wilson-theta. The last three have a variable time step capability, which is controlled internally by a solution convergence error measure. Other features include: multiple time-load history tables to subject the structure to time dependent loading; gravity loading; initial pitch, roll, yaw, and translation of the structural model with respect to the global system; a bandwidth optimizer as a pre-processor; and deformed plots and graphics as post-processors. |
| File Size | 10164600 |
| Page Count | 347 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870007120 |
| Archival Resource Key | ark:/13960/t9285727q |
| Language | English |
| Publisher Date | 1987-01-01 |
| Access Restriction | Open |
| Subject Keyword | Numerical Analysis Dynamic Structural Analysis Aircraft Safety Crashes Lagrange Similarity Hypothesis Structural Failure Data Processing Computerized Simulation Plastic Deformation Elastic Deformation Finite Element Method Aircraft Accidents Computer Graphics Nonlinear Systems Crashworthiness 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 |
