The Structural Response of Cylindrical Shells to Internal Shock Loading

1999 ◽  
Vol 121 (3) ◽  
pp. 315-322 ◽  
Author(s):  
W. M. Beltman ◽  
E. N. Burcsu ◽  
J. E. Shepherd ◽  
L. Zuhal
Keyword(s):  
Shock Wave ◽  
Critical Velocity ◽  
Shock Loading ◽  
Cylindrical Shells ◽  
Structural Response ◽  
Analytical Models ◽  
Infinite Length ◽  
Transient Phenomena ◽  
Internal Shock ◽  
State Models

The internal shock loading of cylindrical shells can be represented as a step load advancing at constant speed. Several analytical models are available to calculate the structural response of shells to this type of loading. These models show that the speed of the shock wave is an important parameter. In fact, for a linear model of a shell of infinite length, the amplitude of the radial deflection becomes unbounded when the speed of the shock wave is equal to a critical velocity. It is evident that simple (static) design formulas are no longer accurate in this case. The present paper deals with a numerical and experimental study on the structural response of a thin aluminum cylindrical shell to shock loading. Transient finite element calculations were carried out for a range of shock speeds. The results were compared to experimental results obtained with the GALCIT 6-in. shock tube facility. Both the experimental and the numerical results show an increase in amplitude near the critical velocity, as predicted by simple steady-state models for shells of infinite length. However, the finite length of the shell results in some transient phenomena. These phenomena are related to the reflection of structural waves and the development of the deflection profile when the shock wave enters the shell.

Analytical Solutions of Structural Response of Cylindrical Shells Subjected to Detonation Loading

2011 ◽  
Author(s):  
Hurang Hu ◽  
Hamid Hamidzadeh
Keyword(s):  
Analytical Solutions ◽  
Moving Load ◽  
Cylindrical Shells ◽  
Space Station ◽  
Structural Response ◽  
Transient State ◽  
Analytical Models ◽  
Static State ◽  
Design And Optimization ◽  
Detonation Loading

Cylindrical shells under a moving internal pressure has wide applications such as oil, gas, and water transmission and distribution pipelines, gun tubes, pressured aircraft fuselages, rocket casings, space station modules, and pulse detonation engines. As a moving load produces larger deformations and higher stresses than does an equivalent static load, the study of this kind of problems has significant importance in design and optimization of such structures. The problem of a cylindrical shell subjected detonation loading has been studied by many researchers, but there are still some problems that need to be further investigated, especially in the application aspect. In this work, analytical solutions for cylindrical shells under detonation loading are developed. The analytical solutions include static state and transient state. For transient state, three analytical models are presented. Numerical results show these analytical solutions are reliable and stable.

The Reaction and Microscopic Electron Properties from Dynamic Evolutions of Condensed-Phase RDX Under Shock Loading

2020 ◽  
Vol 75 (4) ◽  
pp. 285-291
Author(s):  
Jiao-Nan Yuan ◽  
Hai-Chao Ren ◽  
Yong-Kai Wei ◽  
Wei-Sen Xu ◽  
Guang-Fu Ji ◽  
...  
Keyword(s):  
Shock Wave ◽  
Ground State ◽  
Shock Loading ◽  
Reaction Rates ◽  
Reaction Products ◽  
Decomposition Rates ◽  
Multi Scale ◽  
Wave Velocities ◽  
Wide Gap ◽  
Reaction Initiation

AbstractMicroscopic electron properties of α-hexahydro-1,3,5-trinitro-1,3,5-triazine (α-RDX) with different shock wave velocities have been investigated based on molecular dynamics together with multi-scale shock technique. The studied shock wave velocities are 8, 9 and 10 km ⋅ s−1. It has been said that the shock sensitivity and reaction initiation of explosives are closely relevant with their microscopic electron properties. The reactions, including the reaction products, which are counted from the trajectory during the simulations are analysed first. The results showed that the number of the products strictly rely on shock wave velocities. The reaction rates and decomposition rates are also studied, which showed the differences between the different shock velocities. The results of electron properties show that α-RDX is a wide-gap insulator in the ground state and the metallisation conditions of shocked RDX are determined, which are lower than under-static high pressure.

scholarly journals Approximate Analytical Models of Shock-Wave Structure at Steady Mach Reflection

Fluids ◽  
2021 ◽  
Vol 6 (9) ◽  
pp. 305
Author(s):  
Mikhail V. Chernyshov ◽  
Karina E. Savelova ◽  
Anna S. Kapralova
Keyword(s):  
Experimental Data ◽  
Shock Wave ◽  
Comparative Analysis ◽  
Analytical Model ◽  
Mach Reflection ◽  
Supersonic Jet ◽  
Wave Structure ◽  
Analytical Models ◽  
Analytical Prediction ◽  
Shock Wave Structure

In this study, we obtain the comparative analysis of methods of quick approximate analytical prediction of Mach shock height in planar steady supersonic flows (for example, in supersonic jet flow and in narrowing channel between two wedges), that are developed since the 1980s and being actively modernized now. A new analytical model based on flow averaging downstream curved Mach shock is proposed, which seems more accurate than preceding models, comparing with numerical and experimental data.

Effect of Shock Loading on Food Processing

2006 ◽  
Author(s):  
Toshiaki Watanabe ◽  
Hironori Maehara ◽  
Asuka Oda ◽  
Shigeru Itoh
Keyword(s):  
Shock Wave ◽  
Pressure Vessel ◽  
Food Processing ◽  
Food Industry ◽  
Shock Loading ◽  
High Efficiency ◽  
The Other ◽  
Experimental Result ◽  
Shock Wave Loading ◽  
Wave Loading

In the food industry, it is hoping high value-aided product and the increase in efficiency of food processing. On the other hand, we get an experimental result that the load of the shock wave improves an extraction of food, and soften food. But, the safe and high efficiency pressure vessel for the processing is necessary to apply these technologies to the food processing field actually. Therefore, we are planning the development of the pressure vessel for food processing. The fundamental data of the shock loading to food are necessary in order to make suitable vessel. As for these data, it is variety the specifications required by the kind of food and effect to expect. We report the result that shock wave loading was done to various food.

A study of strain measurement in cylindrical shells subjected to underwater shock loading using FBG sensors

Optik ◽  
2020 ◽  
Vol 217 ◽  
pp. 164701
Author(s):  
Ching-Yu Hsu ◽  
Chia-Chin Chiang ◽  
Tso-Sheng Hsieh ◽  
Tao-Hsing Chen ◽  
Ya-Hui Chen
Keyword(s):  
Strain Measurement ◽  
Shock Loading ◽  
Cylindrical Shells ◽  
Underwater Shock ◽  
Fbg Sensors

A Dynamic Shell Theory Coupling Thickness Stress Wave Effects With Gross Structural Response

1973 ◽  
Vol 40 (3) ◽  
pp. 731-735 ◽  
Author(s):  
S. E. Benzley ◽  
J. R. Hutchinson ◽  
S. W. Key
Keyword(s):  
Stress Wave ◽  
Shell Theory ◽  
Cylindrical Shells ◽  
Structural Response ◽  
Early Time ◽  
Stress Wave Propagation ◽  
Late Time ◽  
The Finite Element Method ◽  
Wave Effects ◽  
Circumferential Displacement

A theory for thick cylindrical shells is presented that couples the early time thickness stress wave propagation with higher-order shell theory equations. The formulation completely describes the continuum response in the thickness direction for “early time” considerations while representing the circumferential response with a high-order circumferential displacement assumption. Late time (structural response) equations are developed to continue the analysis after thickness effects are no longer important. The finite-element method is used to obtain solutions of the theory. Calculations are presented which show that thickness stress need not be included for cylindrical shells with h/R ratios less than 0.2.

Dynamic Response of a Clamped Circular Sandwich Plate Subject to Shock Loading

2004 ◽  
Vol 71 (5) ◽  
pp. 637-645 ◽  
Author(s):  
X. Qiu ◽  
V. S. Deshpande ◽  
N. A. Fleck
Keyword(s):  
Finite Element ◽  
Shock Loading ◽  
Structural Response ◽  
Sandwich Plates ◽  
Explicit Finite Element ◽  
The Face ◽  
Analytical Formulas ◽  
Shock Resistance ◽  
Low Sensitivity ◽  
Circular Sandwich Plates

An analytical model is developed for the deformation response of clamped circular sandwich plates subjected to shock loading in air and in water. The deformation history is divided into three sequential stages and analytical expressions are derived for the deflection, degree of core compression, and for the overall structural response time. An explicit finite element method is employed to assess the accuracy of the analytical formulas for the simplified case where the effects of fluid-structure interaction are neglected. The sandwich panel response has only a low sensitivity to the magnitude of the core compressive strength and to the degree of strain hardening in the face-sheets. The finite element results confirm the accuracy of the analytical predictions for the rigid ideally plastic sandwich plates. The analytical formulas are employed to determine optimal geometries of the sandwich plates that maximize the shock resistance of the plates for a given mass. The optimization reveals that sandwich plates have a superior shock resistance relative to monolithic plates of the same mass.

Modeling and 2D Numerical Simulation of Transient Phenomena in Floating Body Soi Mosfets

1997 ◽  
Vol 490 ◽  
Author(s):  
A. M. Ionescu ◽  
F. Chaudier ◽  
A. Chovet
Keyword(s):  
Numerical Simulation ◽  
Drain Current ◽  
Analytical Models ◽  
Floating Body ◽  
Fully Depleted ◽  
Transient Phenomena ◽  
Simulation Based ◽  
Original Contribution ◽  
2D Numerical Simulation ◽  
Current Transients

ABSTRACTThis paper presents a numerical-simulation-based investigation of drain current transients in floating body partially and fully depleted n-channel SOI MOSFETs. For both Zerbst-type and overshoot transients, analytical models are developed and validated. An original contribution concerns the detailed study of drain and source junction influences on the transient regime.

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