scholarly journals Analysis of Damage and Failure mechanism under a lubricated slipper/swashplate interface in Axial Piston Machines

2022 ◽  
Vol 35 ◽  
pp. 124-131
Author(s):  
Gaston Haidak ◽  
Dongyun Wang
Keyword(s):  
Failure Mechanism ◽  
Damage And Failure ◽  
Axial Piston

The damage and failure mechanism of the concrete subjected to shaped charge loading

2017 ◽  
Vol 82 ◽  
pp. 741-752 ◽  
Author(s):  
Xiang-zhao Xu ◽  
Tian-bao Ma ◽  
Jian-guo Ning
Keyword(s):  
Failure Mechanism ◽  
Shaped Charge ◽  
Damage And Failure

Compressive fatigue damage and failure mechanism of fiber reinforced cementitious material with high ductility

2016 ◽  
Vol 90 ◽  
pp. 174-183 ◽  
Author(s):  
Qinghua Li ◽  
Botao Huang ◽  
Shilang Xu ◽  
Baomin Zhou ◽  
Rena C. Yu
Keyword(s):  
Failure Mechanism ◽  
Fatigue Damage ◽  
Cementitious Material ◽  
High Ductility ◽  
Fiber Reinforced ◽  
Damage And Failure

scholarly journals The Dynamic Response and Failure Model of Thin Plate Rock Mass under Impact Load

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Feng Li ◽  
Xinhui Dong ◽  
Yue Wang ◽  
Hanwu Liu ◽  
Chuang Chen ◽  
...  
Keyword(s):  
Rock Mass ◽  
Dynamic Response ◽  
Boundary Conditions ◽  
Failure Mechanism ◽  
Thin Plate ◽  
Impact Load ◽  
Vibration Modes ◽  
Plate Model ◽  
Damage And Failure ◽  
Dynamic Disaster

The layered rock mass widely exists in mining, construction, transportation, and water conservancy projects, and the damage phenomena of plate crack and spalling often occurs in the process of coal and rock dynamic disaster in deep mining. Therefore, the rock mass nearby excavation surface is usually considered to be composed of layers of thin plate rock mass to reveal the damage and failure mechanism of rock mass. In the whole dynamic process of mining and coal and rock dynamic disaster, rock mass would bear the dynamic disturbance from mine earthquake, and at present, the mechanical characteristics of rock mass are mainly studied under static load, while dynamic mechanical response characteristics and the mechanisms of dynamic damage, failure, and disaster-causing are still unclear. This study mainly focused on the dynamic response characteristic and failure mechanism of rock mass based on a rectangular thin plate model. The frequency equations and deflection equations of the thin plate rock mass with different boundary conditions (S-F-S-F, S-C-S-C, and C-C-C-C) were established under free vibration by the thin plate model and the dual equation of the Hamilton system, and the deflection equations under impact load were derived based on the Duhamel integral. And then, the effective vibration modes of the thin plate rock mass with different boundary conditions and their natural frequencies were obtained by Newton’s iterative method. Based on the third-strength theory and the numerical simulation results by LS-DYNA, the maximum shear of the effective vibration modes and the processes of damage and failure under impact load were analyzed. The research results showed that the initial position of damage and failure may be determined by effective vibration mode with the lowest frequency; the develop tendency of which by the combined actions of other effective vibration modes and the effective vibration modes with lower frequency could have greater influence on the process of damage and failure of the thin plate rock mass, which are beneficial to revealing the mechanism of coal and rock dynamic disaster.

scholarly journals Numerical Simulation on Damage and Failure Mechanism of Rock under Combined Multiple Strain Rates

2018 ◽  
Vol 2018 ◽  
pp. 1-20 ◽  
Author(s):  
Wancheng Zhu ◽  
Jiong Wei ◽  
Leilei Niu ◽  
Shuai Li ◽  
Shaohua Li
Keyword(s):  
Failure Mechanism ◽  
Damage Mechanism ◽  
Rock Failure ◽  
Constitutive Law ◽  
Strain Rates ◽  
Rock Damage ◽  
Rock Blasting ◽  
Rate Condition ◽  
Damage And Failure ◽  
Multiple Strain Rates

During underground hard-rock mining, the drilling and blasting method currently remains the most economical excavation method, and the rock may experience a multistrain-rate spectrum under quasi-static, dynamic, and rheological loading conditions and their combination as well. The study on the damage mechanism of rock under multistrain-rate condition that induced by mining excavation is the fundamental issue for predicting the mining-induced hazards such as rockburst. In this study, the state of the art of rock damage and failure under different strain rates is reviewed first. Then, the numerical model for rock failure under multiple strain rates is formulated when the rock damage is taken as the main thread. Meanwhile, we summarize our work in this area over the past ten years, and the constitutive law for the damage and failure of rock under multistrain rates is presented. Finally, several numerical examples, i.e., rock damage and failure under combined static and dynamic load, rock damage and failure triggered by dynamic stress redistribution due to excavation, rock damage and failure induced by blasting, and rock damage and failure due to the combination of dynamic disturbance and rheological load, are presented. Based on these numerical simulations, the associated rock damage mechanism and failure behaviors under differently combined multiple strain rates are clarified, which may provide a theoretical basis for clarifying the rock failure mechanism during rockbursts and rock blasting. Also, further studies on the damage and failure of rock under multiple strain rates are suggested.

Research on Seismic Disaster and Prevention Countermeasures of Electric Power System

2013 ◽  
Vol 838-841 ◽  
pp. 1538-1542
Author(s):  
Wen Yu ◽  
Yi Hang Zhou ◽  
Li Xin Zhu ◽  
Xue Li Ge
Keyword(s):  
Power System ◽  
Electric Power ◽  
Failure Mechanism ◽  
Electric Power System ◽  
Earthquake Damage ◽  
Disaster Prevention ◽  
Damage And Failure ◽  
Electric Structure ◽  
Lifeline Systems ◽  
Seismic Disaster

Electric power system is an important part of lifeline systems, and it is vulnerable to earthquake. In this paper, the characteristics of failure of electric power system are summarized on the basis of its damages in past earthquakes. Then earthquake damage and failure mechanism of electric structure and equipment are analyzed. Finally, from the aspects of engineering and non-engineering, disaster prevention countermeasures are presented.

On the role of tin underlays for the prevention of thermal grooving in thin gold films

1986 ◽  
Vol 44 ◽  
pp. 732-733
Author(s):  
Jin Young Kim ◽  
R. E. Hummel ◽  
R. T. DeHoff
Keyword(s):  
Thin Film ◽  
Free Surface ◽  
Grain Boundary ◽  
Beneficial Effect ◽  
Failure Mechanism ◽  
Failure Mechanisms ◽  
Distinct Advantage ◽  
Gold Films ◽  
Gold Thin Film

Gold thin film metallizations in microelectronic circuits have a distinct advantage over those consisting of aluminum because they are less susceptible to electromigration. When electromigration is no longer the principal failure mechanism, other failure mechanisms caused by d.c. stressing might become important. In gold thin-film metallizations, grain boundary grooving is the principal failure mechanism.Previous studies have shown that grain boundary grooving in gold films can be prevented by an indium underlay between the substrate and gold. The beneficial effect of the In/Au composite film is mainly due to roughening of the surface of the gold films, redistribution of indium on the gold films and formation of In2O3 on the free surface and along the grain boundaries of the gold films during air annealing.

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