High Fracture Efficiency and Stress Concentration Phenomenon for Microgel-Reinforced Hydrogels Based on Double-Network Principle

2012 ◽  
Vol 45 (23) ◽  
pp. 9445-9451 ◽  
Author(s):  
Jian Hu ◽  
Takayuki Kurokawa ◽  
Tasuku Nakajima ◽  
Tao Lin Sun ◽  
Tiffany Suekama ◽  
...  
Keyword(s):  
Stress Concentration ◽  
High Fracture ◽  
Double Network ◽  
Concentration Phenomenon

Improvements for a Hydraulic Excavator's Boom

2014 ◽  
Vol 490-491 ◽  
pp. 510-513
Author(s):  
Sheng Bin Wu ◽  
Xiao Bao Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
High Stress ◽  
The Finite Element Method ◽  
Element Method ◽  
Concentration Phenomenon

Focus on stress concentration and high stress area, four improvements were put forward through analyzed a hydraulic excavator's boom with the finite element method under the bucket digging condition. Compared the stress distribution graph, the results show that these schemes can improve the stress concentration phenomenon and the high stress distribution areas. The practices demonstrated the effectiveness to reduce the invalidation rate of hydraulic excavator's boom.

Numerical Study on the Stress Concentration Phenomenon in the Membranes of PEMFCs in an Assembled State

2020 ◽  
Vol 146 (5) ◽  
pp. 04020053
Author(s):  
Hui Kang ◽  
Zhi-Gang Zhan ◽  
Xiao-Fan Yang ◽  
Zhi-Bo Zhang ◽  
Jin-Rong Shi ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Numerical Study ◽  
Concentration Phenomenon

scholarly journals Structural performance evaluation of a full-scale tempered glass guard and handrail system

2018 ◽  
Vol 10 (6) ◽  
pp. 168781401878257 ◽  
Author(s):  
Seonwoong Kim
Keyword(s):  
Stress Concentration ◽  
Cyclic Loading ◽  
Full Scale ◽  
Structural Safety ◽  
Structural Performance ◽  
Tempered Glass ◽  
Bolted Connection ◽  
Frequent Use ◽  
Loading Methods ◽  
Concentration Phenomenon

In this study, the structural performance capabilities of a tempered glass guard and handrail system not reinforced with a structural framework are investigated. It is known that this cantilevered system has low redundancy and that the glass material itself is brittle. Considering these characteristics, full-scale experiments involving two (bolted and plaster-filled) connection types and two (rectangular and parallel) glass shapes of the types in frequent use as well as two (monotonic and cyclic) loading methods as three variables in total were conducted. Depending on the connection type, the stress concentration phenomenon at the point of the connection appears to be unavoidable. The final fracture mode is very dangerous and sudden such that it is necessary to control the structural safety by means of a higher margin. Specimens with a bolted connection showed inferior performance due to the brittle fracture stemming from the stress concentration phenomenon, while specimens with the plaster-filled connection exhibited excellent performance even under cyclic loading. These results therefore demonstrate that the guard and handrail system with a bolted connection should be structurally reinforced.

Analysis of stress concentration phenomenon of cylinder laminated shells using higher-order shear deformation Quasi-3D theory

2020 ◽  
Vol 232 ◽  
pp. 111526 ◽  
Author(s):  
Tran Ngoc Doan ◽  
Do Van Thom ◽  
Nguyen Truong Thanh ◽  
Phan Van Chuong ◽  
Nguyen Chi Tho ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Shear Deformation ◽  
Higher Order ◽  
Laminated Shells ◽  
Concentration Phenomenon

Numerical Investigation of Stress Concentration Phenomenon in Piled Embankment under Moving Train Loads

2012 ◽  
Vol 193-194 ◽  
pp. 980-983
Author(s):  
Pham Ngoc Thach ◽  
Gang Qiang Kong
Keyword(s):  
Stress Concentration ◽  
High Speed ◽  
Numerical Study ◽  
Soft Soil ◽  
Explicit Finite Element ◽  
Ground System ◽  
Piled Embankment ◽  
Moving Train ◽  
Stiff Soil ◽  
Concentration Phenomenon

A numerical study is performed to investigate the stress concentration phenomenon in a piled embankment during high-speed train passage. In the numerical simulation, the loading of a moving train is first represented in the model as a series of time-varying equivalent concentrated forces vertically acting on the ballast surface, and the explicit finite element method (FEM) is then used to analyze the ballast-embankment-ground system subjected to the equivalent forces. The study shows that owing to the very high stiffness of the piles relative to the soft soil, a majority of the wave energy, which is generated by the passage of wheel axles, is concentrated to the improving piles and transferred down to the stiff soil stratum. By this stress concentration phenomenon, the soft soil surrounding the piles is subjected to less stress, and thus preventing undesirable dynamic effects that could be induced in the soft soil.

Devitrification products of rapidly solidified Ni-Nb amorphous alloys.

1990 ◽  
Vol 48 (4) ◽  
pp. 950-951
Author(s):  
G. A. Bertero ◽  
W.H. Hofmeister ◽  
N.D. Evans ◽  
J.E. Wittig ◽  
R.J. Bayuzick
Keyword(s):  
Electron Microscopy ◽  
Amorphous Structure ◽  
Sulphuric Acid Solution ◽  
X Ray Diffraction ◽  
High Fracture ◽  
Transmission Electron ◽  
Xrd Techniques ◽  
Rapidly Solidified ◽  
Electromagnetically Levitated

Rapid solidification of Ni-Nb alloys promotes the formation of amorphous structure. Preliminary results indicate promising elastic properties and high fracture strength for the metallic glass. Knowledge of the thermal stability of the amorphus alloy and the changes in properties with temperature is therefore of prime importance. In this work rapidly solidified Ni-Nb alloys were analyzed with transmission electron microscopy (TEM) during in-situ heating experiments and after isothermal annealing of bulk samples. Differential thermal analysis (DTA), scanning electron microscopy (SEM) and x-ray diffraction (XRD) techniques were also used to characterize both the solidification and devitrification sequences.Samples of Ni-44 at.% Nb were electromagnetically levitated, melted, and rapidly solidified by splatquenching between two copper chill plates. The resulting samples were 100 to 200 μm thick discs of 2 to 3 cm diameter. TEM specimens were either ion-milled or alternatively electropolished in a methanol-10% sulphuric acid solution at 20 V and −40°C.

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