scispace - formally typeset
Search or ask a question
Topic

Stress relaxation

About: Stress relaxation is a research topic. Over the lifetime, 12959 publications have been published within this topic receiving 270815 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the authors applied damage mechanics to four problems: the instantaneous application of a constant stress to a brittle solid, the subsequent stress relaxation can reproduce the modified Omori's law for the temporal decay of aftershocks following an earthquake, and the solutions for application of constant rates of stress and strain.

86 citations

Journal ArticleDOI
TL;DR: In this paper, compressive properties and stress relaxation at high temperature (below glass transition temperature T-g) were studied, and it was found that compressive stress relaxation kinetics parameter remains temperature independent.

86 citations

Journal ArticleDOI
TL;DR: In this paper, a nonlinear damage creep constitutive model of high-stress soft rock is defined in series with the improved Burgers model, Hooke model and St. Venant model.
Abstract: Rock engineering especially deep rock engineering undergoing long-term effects of external loading and gravity all or most may gradually damage deformation or creep deformation accumulation, leading rock structures to damage, crack, such as severe plastic deformation or even progressive failure. In this paper, based on the nonlinear damage creep characteristics of rock and damage variable, a new nonlinear damage creep constitutive model of high-stress soft rock is defined in series with the improved Burgers model, Hooke model and St. Venant model. This new nonlinear damage creep constitutive model can work out fairly reasonably explanations for the soft rock creep deformation. A series of uniaxial compression creep tests were performed to study the creep damage characteristics of typical soft rock in Jinchuan No.2 Mine in the northwest of China. Using the increment step loading and single-step loading, the results of creep experiments and nonlinear damage creep constitutive model results are very consistent in this study. The new model not only can reflect the whole course of creep deformation, but also can reasonably describe the soft rock under different initial creep stage, steady-state creep stage and accelerated creep stage. Therefore, the new nonlinear creep damage model is a reasonable reference model for the research of soft rock creep.

86 citations

Journal ArticleDOI
TL;DR: In this paper, deformation experiments performed on natural rock salt at a constant strain rate of 3.5×10−7 s−1, 150°C, and confining pressures Pc of 3-30 MPa were conducted.
Abstract: Microstructural evidence for fluid-assisted dynamic recrystallization (FADRX) is widespread in naturally deformed rock salt. However, the principal experimental evidence for FADRX in salt has been obtained from stress relaxation experiments, and it is unclear whether the process occurs during steady state dislocation creep and what its effect might be. Here we report deformation experiments performed on natural rock salt at a constant strain rate of 3.5×10−7 s−1, 150°C, and confining pressures Pc of 3–30 MPa. Samples deformed at Pc = 3 MPa showed continuous work hardening and minor dilatation. Microstructurally, they exhibited intergranular cracking plus slip band and subgrain structures indicative of dislocation glide/creep. Electron backscatter diffraction analysis revealed a high frequency of boundaries with low-angle misorientations in the range 5°–10°. In contrast, samples deformed at Pc ≥ 6.5 MPa showed work hardening followed by steady state flow at strains >6–7%. These samples compacted slightly, and crystal plastic deformation was accompanied by extensive FADRX, with a predominance of high-angle boundaries (30°–50°) over low-angle boundaries. We infer that FADRX is suppressed by dilatation at low pressures as a result of grain boundary disruption. At pressures high enough to prevent dilatation, however, FADRX acts as a “recovery” mechanism counteracting work hardening. The results offer a possible explanation for rheological variability seen in previous experiments conducted at pressures up to 30 MPa. A simple rate model for diffusion- and interface-controlled FADRX indicates that FADRX should become increasingly important toward natural halokinetic conditions, although the effect on flow stresses is likely to be small.

86 citations


Network Information
Related Topics (5)
Polymer
131.4K papers, 2.6M citations
86% related
Oxide
213.4K papers, 3.6M citations
82% related
Coating
379.8K papers, 3.1M citations
82% related
Thin film
275.5K papers, 4.5M citations
82% related
Carbon nanotube
109K papers, 3.6M citations
81% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023145
2022390
2021266
2020276
2019270
2018281