Accession Number : AD0667192

Title :   ON A CAUSE OF FAILURE OF HIGH ALTITUDE PLASTIC BALLOONS.

Descriptive Note : Interim rept.,

Corporate Author : NEW YORK UNIV N Y DEPT OF AERONAUTICS AND ASTRONAUTICS

Personal Author(s) : Kerr,Arnold D. ; Alexander,Harold

Report Date : OCT 1967

Pagination or Media Count : 13

Abstract : In a search for causes of failure of plastic balloons, an experiment which simulates the stresses and temperatures in part of a balloon during launch and ascent was conceived and then tests using a number of balloon films were conducted. It was found that because of uni-axial preloading at +75F (launch temperature), the strength of the film from the final production lot of DFD-5500 deteriorates strongly at -70F (Troposphere temperature), whereas the strength of StratoFilm is unaffected by it. Since this finding agrees with the flight records of balloons made of these materials it is suggested that before a plastic film is accepted as balloon material it should also be subjected to tests of the type discussed in the present paper. (Author)

Descriptors :   (*BALLOONS, RUPTURE), (*POLYETHYLENE PLASTICS, BALLOONS), HIGH ALTITUDE, FILMS, STRESSES, COLD WEATHER TESTS, MATERIALS, CREEP, DEGRADATION, FLIGHT TESTING, LOADS(FORCES)

Subject Categories : Lighter-than-air Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE