نتایج جستجو برای: mudstone accelerated creep
تعداد نتایج: 72635 فیلتر نتایج به سال:
In order to research the creep deformation characteristics of frozen soil and effect various influencing factors on creep, indoor uniaxial tests were carried out specimens at temperatures −5, −4, −3 −2 °C under loads 0.25, 0.5, 0.75 σt, respectively. The different load conditions are analyzed unconfined conditions. results show that test conditions, when is low, there no accelerated stage in cu...
It is important to study the instability law of typical landslides understand evolution regional and for disaster prevention. This uses Zhangjiawan landslide in Xining City, Qinghai Province, as an example. Through field surveys analysis geological environmental conditions, formation mechanisms are summarized. The stability was evaluated using limit equilibrium numerical simulation methods prov...
Salt rock is internationally recognized as an excellent medium for energy storage. However, most of the domestic salt mines are lacustrine laminated formations with mudstone interlayers, which have different creep characteristics to pure rocks. Therefore, in this paper, uniaxial compression tests were carried out on a interlayer Huai’an, Jiangsu, China, and multistage mechanical behavior was in...
A method utilizing expansion of a diaphragm-type film specimen was developed to study in vitro biodegradation of poly(etherurethane urea) (PEUU) under conditions of dynamic loading (fatigue). A finite element model was used to describe the strain state, which ranged from uniaxial at the edges of the film to balanced biaxial tensile strain at the center. During testing, the film was exposed to a...
Background: The short-time creep behavior for a series of biodegradable nanocomposites which is used as implantable device into body is a crucial factor. In the current paper, we aimed to study the effect of bioactive glass nanoparticles (BGn) on creep and creep-recovery behaviors of PLA/PCL blends at different given load and different applied temperatures. Method: A series of biodegradab...
In the Present study, attempt will be made to propose a new method for prediction of long-term essential creep of concrete utilizing some short-term creep tests under high temperature. To do so, regarding the similarities between essential creep of concrete and creep in viscoelastic materials, the time–temperature equivalence relation in viscoelastic materials is evaluated for concrete. This re...
Strain-controlled continuous fatigue and creep–fatigue tests were carried out at 700 °C 800 on Inconel 625 alloy. The effects of strain rate tensile-hold time cyclic stress response life investigated. Then, the microstructural analysis fractographic fatigue-fractured specimens performed by scanning electron microscopy transmission microscopy. responses during high-temperature creep–fatigue–oxid...
We determined radiogenic and cosmogenic noble gases in a mudstone on the floor of Gale Crater. A K-Ar age of 4.21 ± 0.35 billion years represents a mixture of detrital and authigenic components and confirms the expected antiquity of rocks comprising the crater rim. Cosmic-ray-produced (3)He, (21)Ne, and (36)Ar yield concordant surface exposure ages of 78 ± 30 million years. Surface exposure occ...
Fluid pressurization of critically stressed sheared zones can trigger slip mechanisms at work in many geological processes. Using discrete element modeling, we simulate pore-pressure-step creep test experiments on a granular layer under sub-critical stress state to investigate the micromechanical processes stake during fluid induced reactivation. The global response is consistent with available...
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