scholarly journals Numerical and Experimental Approach for Failure Analysis of Soil Subjected to Surface Explosion Loading

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Iau-Teh Wang
Keyword(s):  
Shock Wave ◽  
Failure Analysis ◽  
Dynamic Characteristics ◽  
High Intensity ◽  
Soil Layer ◽  
Detonation Waves ◽  
Explosion Hazard ◽  
Material Failure ◽  
Analysis Model ◽  
Intensity Stress

Controlling the hazards to facilities caused by detonation waves is a high priority in engineering design. To protect an underground facility, soil can reduce the destructive effects of detonation waves. Soil dynamic characteristics and the area of the destructive zone are affected by shock wave energy. The material at ground zero is impacted by high-intensity stress and forms a crater. To ensure the safety of the facility, the protective soil layers must be sufficiently thick. Therefore, the purpose of this study was to analyze the destructive effects that caused the deformation and destruction of an external protective soil layer. The results of the explosion experiments and the numerical simulation analysis were compared to explore the dynamic characteristics of the soil affected by the shock wave and the crater effects of on-ground explosions. The analysis model adopted an 8-node hexahedral element to create a three-dimensional solid structure model of the fluid-solid interaction. The material failure analysis demonstrated that the detonation wave destabilized the interior of the soil body, and the nearby high-intensity stress was the key factor for material failure. The results can serve as a reference for the design of soil-covering layers that provide explosion hazard control.

A step towards safety: Material failure analysis of landing gear

2020 ◽  
Vol 27 ◽  
pp. 402-409
Author(s):  
Aditya Armaan ◽  
Sharma Keshav ◽  
G. Srinivas
Keyword(s):  
Failure Analysis ◽  
Landing Gear ◽  
Material Failure

scholarly journals Finite Element Failure Analysis of GFRP Laminates in Plate-Cone Reticulated Shell

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Xing Wang ◽  
Yu Jiang ◽  
Yonghui Huang ◽  
Yue Huang ◽  
Fan Wang
Keyword(s):  
Failure Analysis ◽  
Composite Laminates ◽  
Strength Criterion ◽  
Laminated Plates ◽  
Engineering Practice ◽  
Analysis Model ◽  
Ansys Software ◽  
Strength Failure ◽  
New Type ◽  
Element Failure

Plate-cone reticulated shell is a new type of spatial structures with good mechanical behavior, technical economy, and architectural appearance. In this paper, using ANSYS software, the strength failure analysis model of composite laminates is established in cooperation with the Strength Criterion of Hoffman. The effects of layer number, laying direction, and thickness of laminates on the ultimate strength of laminates are studied by detailed parametric analysis, which provides a theoretical basis for the design of composite plate-cone reticulated shell and GFRP laminated plates. Some important conclusions are obtained and can be applied to engineering practice.

scholarly journals Generation of a strong reverse shock wave in the interaction of a high-contrast high-intensity femtosecond laser pulse with a silicon target

2019 ◽  
Vol 114 (25) ◽  
pp. 254103
Author(s):  
Kamalesh Jana ◽  
Amit D. Lad ◽  
Moniruzzaman Shaikh ◽  
V. Rakesh Kumar ◽  
Deep Sarkar ◽  
...  
Keyword(s):  
Shock Wave ◽  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
High Intensity ◽  
High Contrast ◽  
Reverse Shock ◽  
Silicon Target

scholarly journals Development and Performance Analysis of Pneumatic Soft-Bodied Bionic Basic Execution Unit

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yu Zhang ◽  
Wenchuan Zhao ◽  
Ning Wang ◽  
Dengyu Lu
Keyword(s):  
Physical Model ◽  
Dynamic Characteristics ◽  
Structural Characteristics ◽  
Research Process ◽  
Leaf Spring ◽  
Deformation Analysis ◽  
Maximum Output ◽  
Analysis Model ◽  
Empirical Formulas ◽  
Execution Unit

This paper studies the design of pneumatic soft-bodied bionic basic execution unit with soft-rigid combination, which can be used as an actuator for pneumatic soft-bodied robots and soft-bodied manipulators. This study is inspired by structural characteristics and motion mechanism of biological muscles, combined with the nonlinear hyperelasticity of silica gel and the insertion of thin leaf spring structure in the nonretractable layer. Response surface analysis and numerical simulation algorithm are used to determine the optimal combination of structural dimension parameters by taking the maximum output bending angle of the basic executing unit as the optimization objective. Based on Odgen’s third-order constitutive model, the deformation analysis model of the basic execution unit is established. The physical model of pneumatic soft-bodied bionic basic execution unit is prepared through 3D printing, shape deposition, soft lithography, and other processing methods. Finally, the motion and dynamic characteristics of the physical model are tested through experiments and result analysis, thus obtaining curves and empirical formulas describing the motion and dynamic characteristics of the basic execution unit. The relevant errors are compared with the deformation analysis model of the execution unit to verify the feasibility and effectiveness of the design of the pneumatic soft-bodied bionic basic execution unit. The above research methods, research process, and results can provide a reference for the research and implementation of pneumatic and hydraulic driven soft-bodied robots and grasping actuators of soft-bodied manipulators.

scholarly journals Theoretical and experimental study on vertical dynamic characteristics of six-axle heavy-haul locomotive on curve

Transport ◽  
2016 ◽  
Vol 33 (1) ◽  
pp. 291-301 ◽  
Author(s):  
Peng-Fei Liu ◽  
Wan-Ming Zhai ◽  
Kai-Yun Wang ◽  
Quan-Bao Feng ◽  
Zai-Gang Chen
Keyword(s):  
Dynamic Characteristics ◽  
Suspension System ◽  
Transition Curve ◽  
Vertical Load ◽  
Analysis Model ◽  
Wheel Load ◽  
Vertical Stiffness ◽  
Curve Length ◽  
Heavy Haul ◽  
Secondary Suspension

This paper presents a method to study the vertical dynamic characteristics of a heavy-haul locomotive in curve. A quasi-static analysis model based on the static force equilibrium relationship is established to investigate the load bearing characteristics of suspension system when the locomotive runs through the curve. Then a locomotive–track coupled dynamics model is used to analyse the dynamic characteristics of wheel load in curves. Finally, a field test in curve is carried out to validate the simulated results. The theoretical analysis results indicate that due to the different twist shapes of track on the entry and exit transition curves, for some specific position in the suspension system or wheel arrangements, the corresponding vertical load along the curve length presents an asymmetry about the section of circular curve. The asymmetry is predominantly caused by the Superelevation Angle Differences (SADs) between car body, bogie frames and wheelsets. A distinct phenomenon is that the outer wheel–rail vertical load of the first axle increases when the locomotive enters the transition curve and then reduces when it exits. These results are expected to provide theoretical guidance to the design of the heavy-haul railways. It is suggested that the asymmetric characteristics of the wheel loads can be improved by some measures, such as adopting a low vertical stiffness in the secondary suspension and increasing the transition curve length.

Study on Dynamic Characteristics of Shock Wave Pressure Sensor Assembly Based on Differential Method

2016 ◽  
Vol 14 (5) ◽  
pp. 536-541 ◽  
Author(s):  
Yang Fan ◽  
Kong Deren ◽  
Kong Lin ◽  
Wang Fang ◽  
Zhang Jinqiu
Keyword(s):  
Shock Wave ◽  
Dynamic Characteristics ◽  
Pressure Sensor ◽  
Differential Method ◽  
Wave Pressure ◽  
Shock Wave Pressure ◽  
Sensor Assembly

Kinetic and Dynamic Characteristics Analysis of Timing Chain System for Diesel Engine

2014 ◽  
Vol 602-605 ◽  
pp. 398-403
Author(s):  
Jia Xin Xi ◽  
Zeng Ming Feng ◽  
Guo Qiang Wang ◽  
Hai Tao Guo
Keyword(s):  
Diesel Engine ◽  
Dynamic Characteristics ◽  
Drive System ◽  
Chain Drive ◽  
Analysis Model ◽  
Analysis And Evaluation ◽  
Chain System ◽  
Characteristics Analysis ◽  
Multi Body ◽  
Dynamic Characteristics Analysis

Kinetic characteristics of chain drive system were investigated in this paper and some corresponding mathematical models were established. In accordance with the theory of chain drive, based on the multi-body dynamics software platform, a dynamic analysis model of timing bushing chain system for diesel engine was established. Chain tension force, chain contact force and chain fluctuation in a rotation cycle at different running speeds were analyzed. By analysis and evaluation these results, the kinematic and dynamic characteristics of the chain drive system during the operation could be effectively recognized, this research results can provide a basis for production tests.

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