An Energy-Based Fatigue and Creep-Fatigue Damage Parameter

1977 ◽  
Vol 99 (4) ◽  
pp. 524-533 ◽  
Author(s):  
B. N. Leis
Keyword(s):  
Damage Parameter ◽  
Mean Stress ◽  
Deformation Response ◽  
Mechanical Cycling ◽  
Creep Fatigue ◽  
General Parameter ◽  
Data Consolidation ◽  
Nonzero Mean ◽  
Fatigue Damage Parameter ◽  
High Degree

A general damage parameter for fatigue and creep-fatigue applications based on the hypothesis that damage is dependent on the internal total octahedral strain energy is derived. This general parameter is valid for isothermal mechanical cycling and inherently accounts for multiaxiality and mean stress for both nonviscous and viscous deformation response, including hold times. Forms of the parameter which correspond to laboratory test conditions under generalized states of stress and strain with nonzero mean stress are derived. The ability of these specific forms to affect data consolidation is examined using experimental fatigue and creep-fatigue life data for the corresponding conditions. It is shown that these specific forms of the general parameter affect a high degree of data consolidation.

scholarly journals Fatigue Damage of Al/SiC Composites - Macroscopic and Microscopic Analysis

2015 ◽  
Vol 60 (1) ◽  
pp. 101-105 ◽  
Author(s):  
A. Rutecka ◽  
Z.L. Kowalewski ◽  
K. Makowska ◽  
K. Pietrzak ◽  
L. Dietrich
Keyword(s):  
Fatigue Damage ◽  
Microscopic Analysis ◽  
Inelastic Strain ◽  
Damage Parameter ◽  
Fatigue Tests ◽  
Cyclic Plasticity ◽  
Damage Mechanisms ◽  
Before And After ◽  
Fatigue Damage Parameter ◽  
Sic Composites

Abstract The results of comparative examinations of mechanical behaviour during fatigue loads and microstructure assessment before and after fatigue tests were presented. Composites of aluminium matrix and SiC reinforcement manufactured using the KoBo method were investigated. The combinations of two kinds of fatigue damage mechanisms were observed. The first one governed by cyclic plasticity and related to inelastic strain amplitude changes and the second one expressed in a form of ratcheting based on changes in mean inelastic strain. The higher SiC content the less influence of the fatigue damage mechanisms on material behaviour was observed. Attempts have been made to evaluate an appropriate fatigue damage parameter. However, it still needs further improvements.

Creep-Fatigue Resistance of a Nickel-Aluminide

1988 ◽  
Vol 133 ◽  
Author(s):  
J. K. Tien ◽  
R. S. Bellows
Keyword(s):  
Fatigue Resistance ◽  
Nickel Aluminide ◽  
Fatigue Behavior ◽  
Mean Stress ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Temperature Regimes ◽  
Creep Fatigue ◽  
The Matrix ◽  
Stress Damage

ABSTRACTA modified fatigue test matrix that provided both creep (high mean stress) and fatigue (alternating stress) damage was used to evaluate the creep-fatigue behavior of D.S. Ni3 Al(B,Hf). The three generic regimes of below, at, and above peak yield strength temperature were investigated. It was found that the creep-fatigue resistance of this intermetallic remains high through the three temperature regimes, allowing it to be further considered as a monolith or as the matrix of high-temperature fiber reinforced composite.

Fatigue Life Prediction of Heat-Aging Vulcanized Natural Rubber

2006 ◽  
Vol 321-323 ◽  
pp. 518-521 ◽  
Author(s):  
Chang Su Woo ◽  
Wan Doo Kim
Keyword(s):  
Fatigue Life ◽  
Natural Rubber ◽  
Life Prediction ◽  
Prediction Equation ◽  
Damage Parameter ◽  
Fatigue Life Prediction ◽  
Aging Effects ◽  
Element Analysis ◽  
Fatigue Damage Parameter ◽  
Lagrange Strain

Heat-aging effects on the material properties and fatigue life prediction of natural rubber were experimentally investigated. The rubber specimens were heat-aged in an oven at the temperature ranging from 50oC to 100oC for a period ranging from 1 day to 90days. Fatigue life prediction methodology of vulcanized natural rubber was proposed by incorporating the finite element analysis and fatigue damage parameter determined from fatigue test. Fatigue life prediction equation effectively represented by a single function using the Green-Lagrange strain. Predicted lives are in a good agreement with the experimental lives within a factor of two

scholarly journals The influence of a quay crane sea transportation on its further exploitation

Transport ◽  
2017 ◽  
Vol 33 (2) ◽  
pp. 536-542 ◽  
Author(s):  
Maksym Starykov ◽  
Frank Van Hoorn
Keyword(s):  
Fatigue Damage ◽  
Damage Parameter ◽  
The Other ◽  
Ship Motions ◽  
The Real ◽  
Container Cranes ◽  
Normal Operating ◽  
Sea Transportation ◽  
Time Savings ◽  
Fatigue Damage Parameter

For the last decades, fully erected container cranes have been delivered to a customer site by ships. On one hand, using this method of transportation is very attractive due to its cost and time savings. However, on the other hand, being exposed to cycling loads from the ship motions during the sea voyage, the crane structure accumulates fatigue damage. Using the accumulated fatigue damage parameter, the crane transportation could be associated with the amount of the working cycles the crane could have worked out during its normal operating at the customer site. In the presenting paper the research for the real case of a new crane voyage from China to Ukraine has been done.

Spectral fatigue analysis for Al 2024-T3 with nonzero mean stress

2019 ◽  
Author(s):  
Pedro Henrique Alves Correa ◽  
Renner Egalon Pereira ◽  
Jorge Alberto Rodriguez Duran
Keyword(s):  
Fatigue Analysis ◽  
Mean Stress ◽  
Nonzero Mean ◽  
Al 2024
Sign in / Sign up

Export Citation Format

Share Document