Fatigue of AZ91E-T6 cast magnesium alloy

Journal Article · Fri Oct 01 04:00:00 EDT 1993 · Journal of Engineering Materials and Technology; (United States)

DOI:https://doi.org/10.1115/1.2904236· OSTI ID:5054229

Goodenberger, D L; Stephens, R I ^[1]

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1. Univ. of Iowa, Iowa City, IA (United States). Mechanical Engineering Dept.

The purpose of this research was to obtain room temperature fatigue behavior of AZ91E-T6 cast magnesium alloy and to determine if commonly used models that depict fatigues behavior are applicable to this cast alloy. Axial strain-controlled fatigue behavior using cylindrical specimens were employed to determine low cycle fatigue behavior. The conventional log-log total strain low cycle fatigue model properly represented the R = [minus]1 axial fatigue data. Significant means stress relaxation occurred for all R = 0 and [minus]2 axial fatigue tests. However, for the smaller strain amplitude tests with R = 0, sufficient mean stresses were retained such that fatigue life was reduced. The mean strains/stresses had little influence on the cyclic stress-strain curve which exhibited cyclic strain hardening. Mean stress effects were analyzed using the Morrow, SWT and Lorenzo-Laird models and similar, but oftentimes nonconservative, calculations resulting. Region 1 and 2 fatigue crack growth behavior was determined using C(T) specimens with load ratios R = P[sub min]/P[sub max] = 0.05 and 0.5. The commonly used low cycle fatigue and fatigue crack growth models appear to reasonably represent most of the results with this AZ91E-T6 cast magnesium alloy.

• OSTI ID: 5054229
• Journal Information: Journal of Engineering Materials and Technology; (United States), Journal Name: Journal of Engineering Materials and Technology; (United States) Vol. 115:4; ISSN 0094-4289; ISSN JEMTA8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
AMBIENT TEMPERATURE
COMPARATIVE EVALUATIONS
CRACK PROPAGATION
DATA
EVALUATION
EXPERIMENTAL DATA
FATIGUE
INFORMATION
MAGNESIUM ALLOYS
MAGNESIUM BASE ALLOYS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
NUMERICAL DATA
RESEARCH PROGRAMS
WEIGHT