Reentry Vehicle Nosetip Stress Analysis.
AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OHIO
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The design analysis problems for graphite and carboncarbon 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 carboncarbon nosetips incompletely characterized materials and inadequate failure criteria. Future nosetip stress analysis capabilities are speculatively predicted.
- Laminates and Composite Materials
- Guided Missiles