Accession Number : AD0476967

Title :   AN INVESTIGATION OF THE THERMAL SHOCK BEHAVIOR OF REFRACTORY MATERIALS.

Descriptive Note : Summary technical rept. Jul 64-Nov 65,

Corporate Author : TRW SYSTEMS GROUP REDONDO BEACH CA

Personal Author(s) : Bohn, J. R. ; King, K. R.

Report Date : DEC 1965

Pagination or Media Count : 133

Abstract : An investigation to develop methods of evaluating and predicting the non-steady state thermal stress behavior of refractory materials is described. Hollow cyclindrical specimens are heated on the inside surface by electron bombardment. With this technique, tungsten specimens 0.75 in. I.D. x 1.5 in. O.D. x 0.5 in. high can be heated to melting in less than one second. Temperature profiles through the wall of the specimens and the resulting strains at the outside of the specimens are measured as functions of time. Temperature profiles and the appropriate materials properties are input to computer program to calculate thermal stresses and strains in the specimens. The comparison of the calculated and measured strains provides a means for establishing the validity of experimental and analytical techniques. The thermal stress analysis can be applied to any hollow cyclindrical body with an arbitrary radial temperature gradient through the wall. The variation of material properties with temperature, as well as plasticity and anisotropy, are accounted for in the analysis. The newly developed techniques are demonstrated using extruded tungsten. Also, the experimental results from thermal shock tests are given for several refractory carbides and a number of oxide dispersed tungsten alloys. (Author)

Descriptors :   (*REFRACTORY MATERIALS, THERMAL SHOCK), TEST METHODS, TUNGSTEN, TUNGSTEN ALLOYS, CARBIDES, COMPOSITE MATERIALS, TEST EQUIPMENT, ELECTRON GUNS, VACUUM FURNACES, EXPERIMENTAL DATA, STRESSES, NUMERICAL METHODS AND PROCEDURES, THERMAL STRESSES, MECHANICAL PROPERTIES, STRAIN(MECHANICS), TITANIUM COMPOUNDS, ZIRCONIUM COMPOUNDS, CERAMIC MATERIALS, REFRACTORY METALS, MATHEMATICAL PREDICTION, ELECTRON IRRADIATION, ELECTRON BEAMS.

Subject Categories : Ceramics, Refractories and Glass
      Laminates and Composite Materials
      Miscellaneous Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE