Axial-torsional fatigue: A study of tubular specimen thickness effects

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Journal of Testing and Evaluation; (United States)

OSTI ID:6788361

Bonacuse, P J; Kalluri, S ^[1]

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1. NASA Lewis Research Center, Cleveland, OH (United States)

A room-temperature experimental program was conducted on AISI type 316 stainless steel to determine the effect of wall thickness on the cyclic deformation behavior and fatigue life of thin wall, tubular, axial-torsional fatigue specimens. The following experimental variables were examined in this study: the depth of the surface work-hardened layer produced in specimen machining, and the effects of strain range and axial-torsional strain phasing. Tubular fatigue specimens were fabricated with wall thickness of 1.5, 2.0, and 2.5 mm. One as-fabricated specimen from each wall thickness was sectioned for microstructural examination and microhardness measurement. A specimen of each wall thickness was tested at each of three conditions-high strain range in-phase, low strain range in-phase, and low strain range out-of-phase-for a total of none axial torsional fatigue experiments. Little or no variation in the fatigue life or deformation behavior as a function of wall thickness was observed. The machining-induced work-hardened zone, as a percentage of the gage section material, was found to have a minimal effect on both deformation behavior and fatigue life. Out-of-phase fatigue tests displayed shorter fatigue lives and more cyclic hardening than in-phase tests.

• OSTI ID: 6788361
• Journal Information: Journal of Testing and Evaluation; (United States), Journal Name: Journal of Testing and Evaluation; (United States) Vol. 21:3; ISSN JTEVAB; ISSN 0090-3973
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
AMBIENT TEMPERATURE
AUSTENITIC STEELS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CORROSION RESISTANT ALLOYS
DATA
DEFORMATION
DIMENSIONS
EXPERIMENTAL DATA
FABRICATION
FATIGUE
HEAT RESIS
HIGH ALLOY STEELS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NUMERICAL DATA
STAINLESS STEEL-316
STAINLESS STEELS
STEEL-CR17NI12MO3
STEELS
TESTING
THICKNESS
TUBES
WALLS