An analysis based on plastic strain energy for bilinearity in Coffin-Manson plots in an Al-Li alloy
- Defence Metallurgical Research Lab., Hyderabad (India)
- Banaras Hindu Univ., Varanasi (India). Dept. of Metallurgical Engineering
Fatigue failure of a component occurs through an irrecoverable energy dissipating process. The alloy dissipates most of the plastic strain energy as heat, the other forms being vibration and acoustic emission. Some energy will be absorbed by immobile life defects and by surface damage processes. In order to gain greater understanding of the material response to fatigue damage, it is necessary to propose a physical quantity with energy dissipation as a fatigue damage parameter. Two such widely used fatigue damage parameters are the average plastic strain energy per cycle ([Delta]W[sub p]), the area under the hysteresis loop during low cycle fatigue and the total dissipated energy (W[sub f]), the sum of the areas of all the loops before failure. Each alloy has a certain capacity to dissipate the plastic strain energy. When this limit is attained, the cracks which originated during the earlier cycling will propagate and failure occurs. This paper presents the results of the analysis of the low cycle fatigue data obtained in the case of a quaternary Al-Li-Cu-Mg alloy. The aim of this analysis is to provide further understanding on the bilinear nature of the Coffin-Manson power law relationship, which has already been reported by several researchers.
- OSTI ID:
- 7303334
- Journal Information:
- Scripta Metallurgica et Materialia; (United States), Vol. 30:12; ISSN 0956-716X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALUMINIUM BASE ALLOYS
FATIGUE
COPPER ALLOYS
LITHIUM ALLOYS
MAGNESIUM ALLOYS
CRACK PROPAGATION
ENERGY LOSSES
EXPERIMENTAL DATA
QUATERNARY ALLOY SYSTEMS
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
DATA
INFORMATION
LOSSES
MECHANICAL PROPERTIES
NUMERICAL DATA
360103* - Metals & Alloys- Mechanical Properties