Two-parameter characterization of low cycle, hysteretic fatigue data

A two-parameter fracture criterion previously applied to flat plates has been extended to cylindrical and spherical shells. It is applicable to all modes of fracture including net section stress levels above yield. The predictive capability is such that the calculated stress at failure for 85 percent of the data examined, was within 10 percent of the experimental values. Furthermore, 96 percent were within 15 percent of the experimental values.

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Hahahahaha, Duuuuude, Yeeessss!: A two-parameter characterization of stretchable words and the dynamics of mistypings and misspellings

PLoS ONE ◽

10.1371/journal.pone.0232938 ◽

2020 ◽

Vol 15 (5) ◽

pp. e0232938

Author(s):

Tyler J. Gray ◽

Christopher M. Danforth ◽

Peter Sheridan Dodds

Keyword(s):

Two Parameter

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The Method to Determine the Expression for Fatigue Curves

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.353-358.331 ◽

2007 ◽

Vol 353-358 ◽

pp. 331-334

Author(s):

Hong Liang Yi ◽

Ming Tu Ma ◽

Zhi Gang Li ◽

Hao Zhang

Keyword(s):

Power Function ◽

Exponential Function ◽

Constant Term ◽

Empirical Expressions ◽

Fatigue Data ◽

Function Expression ◽

Two Parameter

There are three common empirical expressions used for the fatigue curves, which are power function, exponential function and three-parameter power function expression, respectively. The mathematical difference between the former two and the latter is whether there exists the constant term S0 in the equations. The S0 can be calculated to determine whether the two-paprameter expression or three-parameter expression should be used. If the two-parameter expression should be used, the power function and exponential function expressions can be compared to determine which one is the optimum one. Finally, the method has been validated by several groups of fatigue data.

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Asymptotic Methods Applied to the Correlation of Fretting Fatigue Lives

World Tribology Congress III, Volume 1 ◽

10.1115/wtc2005-63995 ◽

2005 ◽

Author(s):

David A. Hills ◽

Christopher M. Churchman ◽

Daniele Dini

Keyword(s):

Asymptotic Methods ◽

Fretting Fatigue ◽

The State ◽

Asymptotic Solutions ◽

State Of Stress ◽

Fatigue Data

Local or asymptotic states of stress relevant to the characterization of the state of stress adjacent to the edges of incomplete contacts are discussed. It is shown that the multipliers for the asymptotic solutions effectively characterize the nucleation propensity of the geometries. This idea is tested by applying the approach to reliable fretting fatigue data in the literature, and re-examining it in this light.

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