Quality Exponent Method for Planning and Interpretation of Results of Full-Scale, Low-Cycle Fatigue Tests 740218
A method is presented for safe-life calculations of aluminum structures subjected to low-cycle fatigue loading. The method is based upon the linear relation between log S and log N in the domain of low-cycle fatigue. Miner's Rule obtains the following new formulation:
with
The use of the formulas involves a single parameter, q0, or an equivalent-quality exponent to be found by test. Other quantities in the formulas are the variables: nj-number of cycles, Smaxj-maximum stress of the loading cycle, Saj-alternating stress of the loading cycle, and a material constant, Ks, named virtual ultimate fatigue stress.
The selection of a safe-life quality exponent results in specifying safe-life coupled to a certain probability of survival at a certain confidence level.
Citation: Schaap, E., "Quality Exponent Method for Planning and Interpretation of Results of Full-Scale, Low-Cycle Fatigue Tests," SAE Technical Paper 740218, 1974, https://doi.org/10.4271/740218. Download Citation
Author(s):
E. Schaap
Pages: 12
Event:
1974 Automotive Engineering Congress and Exposition
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Fatigue
Aluminum
Planning / scheduling
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