Nosetip Design Analysis and Test Program (NDAT). Volume II. Computer User's Manual for the Graphite Nosetip Thermal and Structural Response (GRANTS).
Abstract
GRANTS consists of a 2-D thermal code, GRANT coupled to a 2-D finite-element stress code for analysis of the combined effects of thermochemical ablation and thermal stress. GRANT is composed of many component subprograms tied together by program overlays. Automatic generation of a rectangular-grid nodal point system is provided. Sphere-cones and arbitrary axisymmetric initial configurations may be analyzed. Nonuniform grid spacing, general orthotropy, substrates, and internal cavities are allowed. An alternating-direction-explicit scheme is employed for 2-D transient conduction calculations. The heating and pressure distributions about the nosetip are based upon the instantaneous surface contour. Movement of the boundary nodal points is treated in detail, including the presence of negative body slopes and the correction of particle erosion effects. Example results for a relatively slender nosetip and a relatively blunt nosetip are given. The structural response portion of GRANTS is a finite element code based on the SAAS programs. A complete plot package allows for portrayal of original and deflected meshes, contours, and gradients at user-selected locations. The mode of operation may be automatic in that data are read directly from the thermodynamic portion and computations are performed immediately, or the data may be stored on tape and used at the analyst's discretion.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 15, 1970
- Accession Number
- AD0886930
Entities
People
- Jin H. Chin
- W. Butler
Organizations
- Lockheed Martin Missiles and Space