Accession Number:

AD0274375

Title:

THERMAL STRESS-STRAIN DISTRIBUTION IN A TRANSVERSELY ANISOTROPIC MATERIAL DURING TRANSIENT HEATING

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH

Personal Author(s):

Report Date:

1962-03-30

Pagination or Media Count:

119.0

Abstract:

The potential of pyrolytic graphite as a skin structure for re-entry vehicles led to an investigation of its thermal and mechanical behavior during transient heating and at elevated temperatures. The general 3-dimensional equations of thermoelasticity are developed for a material whose properties exhibit the same anisotropic behavior as those of pyrolytic graphite. The equations are solved exactly for 2-dimensional temperature distribution which closely approximates the temperatures measured experimentally in pyrolytic graphite plates. An oxyacetylene flame apparatus was used to subject 18- and 14-in.-thick pyrolytic graphite plates to transient heating. The temperature distribution through the thickness and along the length of the plate was measured. An experimental technique was developed for measuring transient strains up to a temperature of 1500 F using a Tuckerman optical strain gage. The technique was applied to measure the thermal strain variation in the heated pyrolytic graphite plates.

Subject Categories:

  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE