Accession Number:

AD0756903

Title:

Thermal Stress Behavior of Polycrystalline Graphite. Part III. Special Purpose Tests.

Descriptive Note:

Technical rept. Dec 71 - Nov 72,

Corporate Author:

TRW SYSTEMS GROUP REDONDO BEACH CALIF

Report Date:

1972-12-01

Pagination or Media Count:

89.0

Abstract:

The results obtained in the final phase of a program to evaluate the thermal stress behavior of ATJ-S and AXF-5Q graphite are described. Among the questions examined were 1 the reasons for an observed discrepancy between the measured and calculated strains in the uniaxial thermal stress tests on ATJ-S graphite 2 the susceptibility of ATJ-S to stress reversal fracture 3 the influence of prestressing on thermal stress test results and 4 the influence of biaxial softening on the calculated thermal stress and strain values. An elevated temperature torsion test facility with a capacity for rapid heat-up to test temperature is described and results obtained in tests on 5 ATJ-S specimens are presented. The development of a 200 KW thermal stress testing facility which uses electron beam teachniques for outside diameter heating is also described. Author Modified Abstract

Subject Categories:

  • Ceramics, Refractories and Glass
  • Guided Missile Reentry Vehicles

Distribution Statement:

APPROVED FOR PUBLIC RELEASE