Accession Number : ADA018244
Title : Reentry Vehicle Nosetip Stress Analysis.
Descriptive Note : Technical rept.,
Corporate Author : AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
Personal Author(s) : Jones,Robert M. ; Koenig,John R.
Report Date : AUG 1975
Pagination or Media Count : 36
Abstract : The design analysis problems for graphite and carbon/carbon reentry vehicle nosetips in ballistic and maneuvering trajectories are outlined. The ultimate objective is computer programs for prediction of the thermal and mechanical stress behavior of such nosetips. The steps for qualifying computer programs to attain the objective are discussed in the context of necessary laboratory experiments through flight tests. Present nosetip stress analysis computer programs are characterized, and material behavioral characteristics nor properly treated are identified. Some of the problem areas are different tensile and compressive moduli; nonlinear orthotropic behavior including biaxial softening (substantially increased strains under biaxial tensile loading opposed to uniaxial loading); macroscopic inhomogeneity and asymmetry of carbon/carbon nosetips; incompletely characterized materials; and inadequate failure criteria. Future nosetip stress analysis capabilities are speculatively predicted.
Descriptors : *REENTRY VEHICLES, *NOSE CONES, *CARBON CARBON COMPOSITES, GRAPHITED MATERIALS, STRESS ANALYSIS, BALLISTIC TRAJECTORIES, ANISOTROPY, COMPOSITE MATERIALS
Subject Categories : Laminates and Composite Materials
Distribution Statement : APPROVED FOR PUBLIC RELEASE