Topic
Stress relaxation
About: Stress relaxation is a research topic. Over the lifetime, 12959 publications have been published within this topic receiving 270815 citations.
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TL;DR: In this article, the authors derived the apparent stress exponent and activation energy in materials whose deformation is controlled by double kink nucleation and propagation on dislocations, and showed that the apparent activation energy can easily be 10-20% lower than the true activation energy, depending on the stress.
65 citations
TL;DR: In this paper, the response of hot-rolled 1020 steel over a wide range of temperatures and strain rates is investigated, and constitutive equations are developed for modeling the material response.
65 citations
TL;DR: In this article, a three-dimensional model is formulated to describe the thermo-mechanical behavior and shape-memory performance of amorphous polymers in large deformation.
65 citations
TL;DR: In this article, the authors developed amorphous carbon films in sequential layers and studied their intrinsic stress, composition, and stress relief mechanisms, showing that the A layers (rich in sp2 sites) promote the stress relaxation of the films during a compositional rearrangement when a B layer is deposited; this process develops thick and stable films with lower stresses.
Abstract: We have developed amorphous carbon films in sequential layers and studied their intrinsic stress, composition, and stress relief mechanisms. The films were deposited by sputtering either thin, with fixed bias voltage Vb or thick, with alternative (positive-layer A/negative-layer B) Vb. In situ spectroscopic ellipsometry and stress studies were used and supported by nanoindentation and x-ray reflectivity measurements. The films deposited with fixed negative (positive) Vb exhibit a thickness-dependent increase (decrease) of compressive stresses up to 200 A and saturate at 6(1) GPa. In thick films deposited with alternative Vb the results demonstrate that: (1) the same modulation in stress values and sp3 content versus film thickness exists, supporting their direct interrelation; (2) the A layers (rich in sp2 sites) promote the stress relaxation of the films during a compositional rearrangement when a B layer is deposited; and (3) this process develops thick and stable films with lower stresses.
65 citations
TL;DR: In this paper, the authors investigated the room-temperature creep behavior of three high strength steels and found that the primary creep in all three alloys agreed well with the logarithmic creep law and the creep mechanism has been identified as pure dislocation creep.
Abstract: The room-temperature creep behaviour of three high strength steels has been investigated. Several parameters such as creep stress, loading rate, stress history and heat treatment has been altered and their influence on the low temperature creep has been reported. The primary creep in all three alloys agreed well with the logarithmic creep law and the creep mechanism has been identified as pure dislocation creep. Higher stresses and high loading rates led to increased creep strains and strain rates. Reloading after a period of creep resulted in significantly decreased creep strains and no recovery of the time dependent deformation could be detected. The yield strength of the materials per se had no influence on the room temperature creep whereas the same material with decreased 0.2% offset strength showed significantly reduced time dependent deformation. The possible interaction between primary creep and stress corrosion cracking has been discussed.
65 citations