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Low cycle fatigue life estimation for ductile metals using a nonlinear continuum damage mechanics model

โœ Scribed by N. Bonora; G.M. Newaz

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
913 KB
Volume
35
Category
Article
ISSN
0020-7683

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โœฆ Synopsis

Al~rset--Continuum damage mechanics is an effective approach to model ductile failure. The same concepts can be extended to the low cycle fatigue damage process, where plasticity is still the key mechanism for crack initiation. In addition, in low cycle fatigue a relevant part of life is spent by the material to initiate a macroscopic crack that leads to complete failure. In this paper, the nonlinear damage model, initially proposed by Bonora, N. (1997) A non-linear CDM model for ductile fracture Engineering Fracture Mechanics (in press), is extended to the case of cyclic loading. Three possible formulations are proposed and discussed that take into account in different ways the accumulation of damage, plastic strain and the material cyclic properties change. Fully coupled life model was used to predict low cycle fatigue life in AI 2024 T3 alloy and HYS0 low carbon steel. Comparison with a large fatigue experimental data set is also presented.

๐Ÿ“œ SIMILAR VOLUMES

A continuum damage mechanics model for l
A continuum damage mechanics model for low-cycle fatigue failure of metals
โœ Wang June ๐Ÿ“‚ Article ๐Ÿ“… 1992 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 307 KB

Abstnct-A continuum damage ma%nics model for low-cycle fatigue is presented. The rupture time of hot rolled type RS50 steel is predicted by the damage model and compared with those measured with excellent agreement. It is shown that the proposed damage model can predict the rupture time of material