Spalling behavior of Cu plate under sliding detonation loading

2017 ◽  
Author(s):  
Cheng Fan ◽  
Mingtao Liu ◽  
Zhaoliang Guo ◽  
Tiegang Tang
Keyword(s):  
Detonation Loading

scholarly journals Effect of Heat Treatment Process and Composition on Deformation and Damage Behavior of WHA under Detonation Loading

2021 ◽  
Vol 2101 (1) ◽  
pp. 012067
Author(s):  
J J Tang ◽  
Z F Liang ◽  
X Y Hu
Keyword(s):  
Mechanical Properties ◽  
Treatment Process ◽  
High Strain ◽  
Dynamic Mechanical Properties ◽  
Damage Effect ◽  
Tungsten Heavy Alloy ◽  
Damage Behavior ◽  
Explosion Test ◽  
The Military ◽  
Detonation Loading

Abstract The excellent material properties of tungsten heavy alloy (WHA) make it widely used in the military field. When used as killing elements of weapons, its dynamic mechanical properties under detonation loading directly determine the damage effect of weapons, which makes the research on its mechanical behaviors under high pressure and high strain rate loads such as detonation loading of great significance. In this paper, several WHAs with different compositions and processes are selected, and the mechanical properties and deformation and damage behavior under static explosion test are analyzed by combining macro and micro study, so as to provide guidance for the subsequent optimization of the performance design of WHA.

Structural response to detonation loading in 90-degree bend

Shock Waves ◽  
2009 ◽  
pp. 383-388 ◽  
Author(s):  
Z. Liang ◽  
T. Curran ◽  
J.E. Shepherd
Keyword(s):  
Structural Response ◽  
Detonation Loading

Gaseous Deflagration in Piping: Part 2 — Proposed Methods and Code Acceptance Criteria

2017 ◽  
Author(s):  
John C. Minichiello ◽  
Thomas C. Ligon ◽  
David J. Gross
Keyword(s):  
Rise Time ◽  
Lower Energy ◽  
Waste Treatment ◽  
Pressure Rise ◽  
Piping System ◽  
Frequent Event ◽  
Piping Systems ◽  
Hydrogen Accumulation ◽  
Induced Stresses ◽  
Detonation Loading

This paper proposes Piping Code rules to address the effects of hydrogen deflagrations inside piping. Previous work proposed a set of criteria for piping subject to detonation loading [PVP2012-78519, PVP2012-78525]. This paper provides criteria to evaluate the effect of deflagrations, which typically have a slower rise time and lower energy, inside the piping. These deflagration criteria, coupled with the previously cited detonation criteria, are being used at the Hanford Tank Waste Treatment and Immobilization Plant to evaluate piping systems subject to hydrogen accumulation. The previous papers did not investigate or propose criteria for deflagrations, as these were known to have lower pressures and slower pressure rise times, but are still of some significance for piping design. Recent work has shown that there exists a scenario in which the deflagration loading may be very significant: deflagrations in small gas pockets surrounded by large waste slugs. Depending on the assumptions used to develop the loading, the unbalanced forces on piping segments in a long piping system can become high during a deflagration event. Thus, for the set of criteria chosen for deflagration, the deflagration event may become the limiting event, especially if it is the more frequent event. The criteria proposed need to recognize this scenario and guide the user to possible solutions. This paper presents the original methodology for evaluating these “slug” events, briefly discusses the recent testing and theory being pursued to reduce the effect of the loading [PVP2015-45970, PVP2016-63260, PVP2016-63262], and then proposes criteria for evaluating deflagration induced stresses and loads.

scholarly journals Comparison of Fracture Response of Preflawed Tubes Under Internal Static and Detonation Loading

2003 ◽  
Author(s):  
Tong Wa Chao ◽  
Joseph E. Shepherd
Keyword(s):  
Crack Detection ◽  
Strain History ◽  
Strain Gages ◽  
Pressure Transducers ◽  
Gaseous Detonations ◽  
Propagation Behavior ◽  
Significant Difference ◽  
Detonation Loading ◽  
Crack Propagation Behavior ◽  
Axial Surface

Fracture experiments were performed on thin-walled and preflawed aluminum 6061-T6 tubes. Flaws were machined as external axial surface notches. The tubes were 1) statically loaded with oil, 2) statically loaded with nitrogen, and 3) dynamically loaded with gaseous detonations traveling at 2.4 km/s. The experiments were controlled so that comparisons could be made on sets of specimens with the same material, tube and flaw geometry, nominal loading amplitude, and flange supports, with the only difference being the dynamics of the loading. It was found that there is a significant difference in crack propagation behavior for the three types of loading. In this paper, fracture behavior will be discussed along with the fluid dynamics involved. The tubes were also instrumented with pressure transducers, crack detection gages, and strain gages so that data on loading, crack propagating speeds, and strain history can be compared.

scholarly journals On the Adequacy of Shell Models for Predicting Stresses and Strains in Thick-Walled Tubes Subjected to Detonation Loading

2013 ◽  
Author(s):  
Neal P. Bitter ◽  
Joseph E. Shepherd
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Shell Model ◽  
Wall Thickness ◽  
Axial Strain ◽  
Nonlinear Behavior ◽  
Element Model ◽  
Shell Models ◽  
Axial Curvature ◽  
Detonation Loading

This paper analyzes the adequacy of shell models for predicting stresses and strains in thick-walled tubes subjected to detonation loads. Of particular interest are the large axial strains which are produced at the inner and outer surfaces of the tube due to bending along the tube axis. First, comparisons between simple shell theory and a static finite element model are used to show that the axial strain varies proportionally with wall thickness and inversely with the square of the axial wavelength. For small wavelengths, this comparison demonstrates nonlinear behavior and a breakdown of the shell model. Second, a dynamic finite element model is used to evaluate the performance of transient shell equations. This comparison is used to quantify the error of the shell model with increasing wall thickness and show that shell models can be inaccurate near the load front where the axial curvature is high. Finally, the results of these analyses are used to show that the large axial strains which are sometimes observed in experiments cannot be attributed to through-wall bending and appear to be caused instead by non-ideal conditions present in the experiments.

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.

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