At room temperature, the material exhibited cyclic hardening and the fracture mode was mainly interlamellar. At 750°C and 900°C, the material showed cyclic softening and the fracture mode was
hardening, but cyclic softening at 750 °C and 900 °C. It seems that the investigated material was more suitable to serve at 750 °C, because the fatigue life was longer and the plastic strain amplitude was lower than that at room temperature and 900 °C. Plenty of studies have shown that cyclic hardening typically occurred in TiAl alloys at room Cyclic deformation behaviour of austenitic steels at Cyclic deformation behaviour of austenitic steel 191 s a a,p = stress amplitude s m = mean stress e a,t = total strain amplitude e a,p = plastic strain amplitude e m,t = total mean strain e m,p = plastic mean strain Total strain Nominal Stress e m,t s m e m,p E s m 2 e 2e a,t s a Figure 3. Characteristic values of a hysteresis loop.
Nov 03, 2015 · Here we demonstrate that when aluminum single crystals of submicrometer dimensions are subjected to low-amplitude cyclic deformation at room temperature, the density of preexisting dislocation lines and loops can be dramatically reduced with virtually no change of the overall sample geometry and essentially no permanent plastic strain. Cyclic shearing deformation behavior of saturated clays Oct 01, 2007 · The deformations of clay samples under the complex initial and the cyclic coupled stress conditions include the normal deviatoric deformation and horizontal shear deformation, the average deformation and cyclic deformation. A general strain failure criterion taking into account these deformations is recommended and is proved more stable and suitable compared to the strain failure
Dec 16, 2019 · The purpose of this paper is to investigate the effect of stress classification on cyclic viscoplastic response of a structure (here, a thick spherical vessel which has an application in pressure vessel technology). The response is either reverse plasticity and shakedown or ratcheting behavior of a structure. The viscoplastic behavior of thick spherical vessels subjected to thermo-mechanical Deformation characteristics of fine-grained soil under Mar 18, 2020 · Since there is an interval time between two trains traveling in the same direction on an automatically blocked line, the dynamic loading on the railway subgrade is composed of periodic vibration when the train passes and an intermittent stage after a train has passed. Take into account this characteristic, a series of continuous-stopping repeated load triaxial tests were conducted to study
Jun 13, 2019 · Glutaraldehyde-fixed bovine pericardium underwent marked cyclic dependent strain, resulting from significant changes in structure, composition and mechanical function of the material. Conversely, unfixed bovine pericardium underwent minimal strain and maintained its structure, composition and mechanical integrity. Experimental Study on the Deformation and Strength The deformation and strength characteristics of saturated clay are studied through a cyclic triaxial test of clay in the Wenchuan earthquake area. Specifically, the effects of cyclic stress ratio, initial shear stress, and vibration frequency on the dynamic characteristics of saturated clay are analysed. Results show a failure strain in the dynamic strain development of saturated clay.
Mar 28, 2015 · Hence, the cyclic deformation and fatigue behaviour of such lowly alloyed -iron is more similar to that of FCC materials, with dipolar edge dislocations in dense veins and with strain localization in PSB-like bands, albeit with a cell structure instead of the ladder structure . Orientation Of Stress Fibers In A Cultured Endothelial We proposed a strain limit hypothesis to explain the orientation of SFs caused by cyclic deformation which had another concept from the previous hypothesis [4, 5]. The hypothesis states that a SF orients itself only in the direction in which the strain in the fiber direction does not exceed the strain limit in the maximum deformed state of the
Apr 08, 2021 · In particular, it may cause a local reinforcement where an inhomogeneous strain field is present, as is the case of a crack propagating in cyclic fatigue, providing a Cyclic Strain - an overview ScienceDirect TopicsAccording to a two-phase model of cyclic plastic straining (Winter, 1974), the matrix is deformed nearly elastically (in the plateau domain it carries only a small plastic shear strain amplitude, aM 6 × 10 5), and PSBs accommodate most of the applied cyclic plastic strain (plastic shear strain amplitude in the PSBs, aPSB 6 × 10 3).