Accession Number:

AD1043126

Title:

Cyclic Axial-Torsional Deformation Behavior of a Cobalt-Base Superalloy

Descriptive Note:

[Technical Report, Memorandum Report]

Corporate Author:

ARMY RESEARCH LAB CLEVELAND OHNATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH

Personal Author(s):

• Bonacuse, Peter J.
• Kalluri, Sreeramesh

Report Date:

1992-11-01

Pagination or Media Count:

26

Abstract:

Multiaxial loading, especially at elevated temperature, can cause the inelastic response of a material to differ significantly from that predicted by simple flow rules, i.e., von Mises or Tresca. To quantify some of these differences, the cyclic high-temperature, deformation behavior of a wrought cobalt-base superalloy, Haynes 188, is investigated under combined axial and torsional loads. Haynes 188 is currently used in many aerospace gas turbine and rocket engine applications, e.g., the combustor liner for the T800turboshaft engine for the RAH-66 Comanche helicopter and the liquid oxygen posts in the main injector of the space shuttle main engine. The deformation behavior of this material is assessed through the examination of hysteresis loops generated from a biaxial fatigue test program. A high-temperature axial, torsional, and combined axial-torsional fatigue data base has been generated on Haynes 188 at 760 C. Cyclic loading tests have been conducted on uniform gauge section tubular specimens in a servohydraulic axial-torsional test rig. Test control and data acquisition were accomplished with a minicomputer.

Descriptors:

• stress strain relations
• data acquisition
• gas turbines
• high temperature
• materials
• engineering
• fatigue tests (mechanics)
• rocket engines
• shear stresses
• acquisition
• engines
• stresses
• turboshaft engines
• advanced materials
• databases
• hardening
• materials science
• space shuttles
• superalloys
• turbines

Subject Categories:

• Metallurgy and Metallography

Distribution Statement:

[A, Approved For Public Release]