Accession Number : AD0871264

Title :   Crack Tolerating Ability of High-Strength Biaxially Stressed Cylindrical Pressure Vessel Containing a Surface Crack.

Descriptive Note : Rept. no. 8 (Final),

Corporate Author : AUBURN UNIV AL ENGINEERING EXPERIMENT STATION

Personal Author(s) : Maynor, Hal W., Jr. ; Busch, Courtney C.

Report Date : 14 DEC 1969

Pagination or Media Count : 18

Abstract : Test specimens in the form of cylindrical pressure vessels were deep drawn from AISI 4130 steel and heat treated to an average yield strength (0.2 per cent offset) of 207,000 psi. Each vessel was provided with an initial surface crack consisting of a mechanically-provided slot, terminating at each end in a fatigue-induced, hairline-type crack. In the fewer instances, the initial-crack depth was less than one-half the wall thickness of 0.060 in. Strain gages mounted at both ends provided a measure of the stress at these locations during the development of internal pressures culminating in bursting. The constants of k, gamma, and delta of the previously deduced equation for the critical stress intensity factor K sub c were determined experimentally. Crack instability in the biaxially-stressed vessels generally occurred at stress magnitudes considerably less than the theoretical biaxial yield stress of the same member containing no surface crack. (Author)

Descriptors :   (*PRESSURE VESSELS, STEEL), (*STEEL, CRACK PROPAGATION), FRACTURE(MECHANICS), CYLINDRICAL BODIES, STRESSES, CRACKS.

Subject Categories : Metallurgy and Metallography
      Structural Engineering and Building Technology
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE