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A novel constitutive model for stress relaxation of Ti-6Al-4V alloy sheet
- Source :
- International Journal of Mechanical Sciences. :105034
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- In this paper, the stress relaxation tests were performed on Ti-6Al-4V alloy sheet with different initial total strains and different temperatures. Based on the experimental data, a novel empirical equation for predicting the stress versus time curves was proposed, and then an explicit constitutive model for describing the stress relaxation behaviours was further developed. The average prediction error was less than 8.27%, proving the proposed prediction curves were valid. In addition, two material constants which depend on initial stresses and total strains were introduced to accurately describe the stress relaxation curves. Then the methods for solving these two material constants under different initial conditions were presented. Finally, a simple method for dividing the stress relaxation stages was proposed. There are three stages in the stress relaxation curve studied in this paper, including the loading stage, stress relaxation-I and stress relaxation-II. A symbol called ηi which represents the normalized ratio of instantaneous stress to initial stress was used. When time τ is equal to α, the ratio of instantaneous normalized stress to normalized initial stress is reduced to η1 = 1/e, and the instantaneous plastic strain at this moment is (1 − η1) of the total plastic strain.
- Subjects :
- Empirical equations
Materials science
Mechanical Engineering
Constitutive equation
02 engineering and technology
Mechanics
Plasticity
021001 nanoscience & nanotechnology
Condensed Matter Physics
Moment (mathematics)
Stress (mechanics)
020303 mechanical engineering & transports
0203 mechanical engineering
Mechanics of Materials
Stress relaxation
Material constants
General Materials Science
Ti 6al 4v
0210 nano-technology
Civil and Structural Engineering
Subjects
Details
- ISSN :
- 00207403
- Database :
- OpenAIRE
- Journal :
- International Journal of Mechanical Sciences
- Accession number :
- edsair.doi...........c9e5cf38fd25e2dc262467b2af3a0f89