ISSN:
1573-9325
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Conclusions 1. It has been established that failure in a composite stress state is a kinetic process and is described by an equation such as (1). 2. In tension, torsion, and their combined effect, the activation energy of the rupture process may be considered to be one of two values: one near the sublimation energy, the other near the energy of self diffusion. 3. It is suggested that, in the range of changes in stress state from torsion to tension, failure may be controlled by two kinetic processes: for tension, and stress states near it, a thermal fluctuation process obtains, occasioned by the rupture of bonds or, according to [6, 7, 20, 21, 22], by the migration of interstitial atoms; and for stress states in the range of torsion the process is associated with diffusion of vacancies. 4. In the range of changes in stress state in which the mechanism controlling failure remains unchanged, there may exist a single criterion of failure having a clear physical significance. For aluminum alloy it has been established that in the stress states 2 ≥ σ1/tmax ≥ 1.55 the criterion of failure is represented by the greatest tensile stresses σ1 in the states 1 ≤ σ1/tmax ≤ 1.42 it is represented by the maximum tangential stresses tmax. 5. For tension and torsion, a relationship has been found between the coefficients γ in Eq. (1), permitting us to determine service life in torsion from the service life in tension, and vice versa.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01527830
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