Risk probabilistic assessment of ultrahigh arch dams through regression panel modeling on deformation behavior

Mixed‐coefficient panel model for evaluating the overall deformation behavior of high arch dams using the spatial clustering

Structural Control and Health Monitoring ◽

10.1002/stc.2809 ◽

2021 ◽

Author(s):

Shaowei Wang ◽

Cong Xu ◽

Yi Liu ◽

Bangbin Wu

Keyword(s):

Deformation Behavior ◽

Spatial Clustering ◽

Arch Dams ◽

Panel Model ◽

High Arch Dams

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Unified egg ellipse critical threshold estimation for the deformation behavior of ultrahigh arch dams

Engineering Structures ◽

10.1016/j.engstruct.2020.110598 ◽

2020 ◽

Vol 214 ◽

pp. 110598

Author(s):

Erfeng Zhao ◽

Chengqing Wu

Keyword(s):

Deformation Behavior ◽

Critical Threshold ◽

Threshold Estimation ◽

Arch Dams

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Hysteretic effect considered monitoring model for interpreting abnormal deformation behavior of arch dams: A case study

Structural Control and Health Monitoring ◽

10.1002/stc.2417 ◽

2019 ◽

Vol 26 (10) ◽

Cited By ~ 4

Author(s):

Shaowei Wang ◽

Yingli Xu ◽

Chongshi Gu ◽

Tengfei Bao ◽

Qun Xia ◽

...

Keyword(s):

Deformation Behavior ◽

Arch Dams ◽

Monitoring Model ◽

Hysteretic Effect

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Plastic deformation of θ ' in Al-4%Cu alloy

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100110027 ◽

1978 ◽

Vol 36 (1) ◽

pp. 576-577

Author(s):

Shrikant P. Bhat

Keyword(s):

Deformation Behavior ◽

Room Temperature ◽

Electron Microscopic Observation ◽

Bulk Alloy ◽

Electron Microscopic ◽

Cu Alloy ◽

Cu Alloys ◽

Orowan Mechanism ◽

The Subject ◽

Cyclic Straining

deformation behavior of Al-Cu alloys aged to contain θ ' has been the subject of many investigations (e.g., Ref. 1-5). Since θ ' is strong and hard, dislocations bypass θ ' plates (Orowan mechanism) at low strains. However, at high strains the partially coherent θ ' plates are probably sheared, although the mechanism is complex, depending on the form of deformation. Particularly, the cyclic straining of the bulk alloy is known to produce gross bends and twists of θ '. However, no detailed investigation of the deformation of θ ' has yet been reported; moreover, Calabrese and Laird interpreted the deformation of θ ' as largely being elastic.During an investigation of high temperature cyclic deformation, the detailed electron-microscopic observation revealed that, under reversed straining conditions, θ ' particles are severely distorted--bent and twisted depending on the local matrix constraint. A typical electronmicrograph, showing the twist is shown in Fig. 1. In order to establish whether the deformation is elastic or plastic, a sample from a specimen cycled at room temperature was heated inside the microscope and the results are presented in a series of micrographs (Fig. 2a-e).

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Observation of secondary slip systems in tungsten bicrystals

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100112361 ◽

1984 ◽

Vol 42 ◽

pp. 478-479

Author(s):

J. R. Fekete ◽

R. Gibala

Keyword(s):

Stress Field ◽

Grain Boundaries ◽

Deformation Behavior ◽

Stress Axis ◽

Polycrystalline Materials ◽

Slip Systems ◽

Metallic Materials ◽

Twist Boundary ◽

Secondary Slip ◽

Plane Normal

The deformation behavior of metallic materials is modified by the presence of grain boundaries. When polycrystalline materials are deformed, additional stresses over and above those externally imposed on the material are induced. These stresses result from the constraint of the grain boundaries on the deformation of incompatible grains. This incompatibility can be elastic or plastic in nature. One of the mechanisms by which these stresses can be relieved is the activation of secondary slip systems. Secondary slip systems have been shown to relieve elastic and plastic compatibility stresses. The deformation of tungsten bicrystals is interesting, due to the elastic isotropy of the material, which implies that the entire compatibility stress field will exist due to plastic incompatibility. The work described here shows TEM observations of the activation of secondary slip in tungsten bicrystals with a [110] twist boundary oriented with the plane normal parallel to the stress axis.

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