The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
J L Maienschein - One of the best experts on this subject based on the ideXlab platform.
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the scaled thermal explosion experiment
2002Co-Authors: J. F. Wardell, J L MaienscheinAbstract:We have developed the Scaled Thermal Explosion Experiment (STEX) to provide a database of reaction violence from thermal explosion for explosives of interest. Such data are needed to develop, calibrate, and validate predictive capability for thermal explosions using simulation computer codes. A Cylinder of explosive 25, 50 or 100 mm in diameter, is confined in a Steel Cylinder with heavy end caps, and heated under controlled conditions until reaction. Reaction violence is quantified through non-contact micropower impulse radar measurements of the Cylinder wall velocity and by strain gauge data at reaction onset. Here we describe the test concept, design and diagnostic recording, and report results with HMX- and RDX-based energetic materials.
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Thermal explosion violence of HMX-based explosives -- effect of composition, confinement and phase transition using the scaled thermal explosion experiment
2000Co-Authors: J L Maienschein, J. F. Wardell, John E. ReaughAbstract:We developed the Scaled Thermal Explosion Experiment (STEX) to provide a database of reaction violence from thermal explosion of explosives of interest. A Cylinder of explosive, 1, 2 or 4 inches in diameter, is confined in a Steel Cylinder with heavy end caps, and heated under controlled conditions until it explodes. Reaction violence is quantified by micropower radar measurement of the Cylinder wall velocity, and by strain gauge data at reaction onset. Here we describe the test concept and design, show that the conditions are well understood, and present initial data with HMX-based explosives. The HMX results show that an explosive with high binder content yields less-violent reactions that an explosive with low binder content, and that the HMX phase at the time of explosion plays a key role in reaction violence.
Rong Chuan-xin - One of the best experts on this subject based on the ideXlab platform.
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Numerical simulation for composite shift lining of inner Steel Cylinder and high strength reinforced concrete
Journal of Guangxi University, 2010Co-Authors: Rong Chuan-xinAbstract:Aiming at the problem of frozen shaft supports in super deep alluvium,numerical simula-tion for the strength characteristics of the composite shaft lining of inner Steel Cylinder and high strength reinforced concrete is carried out. The numerical simulation results indicate that the bearing capacity of the shaft lining can be obviously improved while the concrete grade is enhanced,the ratio of thickness and radius is increased or the thickness of inner Steel Cylinder is raised. The effect of reinforcement ratio to the bearing capacity of the shaft lining is limited. From the numerical simulation results,the equation to calculate the bearing capacity of the composite shaft lining of inner Steel Cylinder and high strength reinforced concrete can be concluded. The calculation method is simple and can be applied in the design of the shaft lining structure.
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Research on vertical bearing capacity of shaft lining structure of high strength concrete and double Steel Cylinders in super-thick alluvium
Rock and Soil Mechanics, 2010Co-Authors: Rong Chuan-xinAbstract:The vertical mechanical behavior of composite shaft lining of high strength concrete and double Steel Cylinder is researched by model test and theoretical analysis. According to the similarity theory,the model of composite shaft lining of high strength concrete and double Steel Cylinder is designed and manufactured first. Afterward,through loading test,the vertical stress,strain and strength characteristics of the composite shaft lining of high strength concrete and double Steel Cylinder are gained. The results indicate that the concrete compressive strength increases 1.73-1.92 times under triaxial compressive stresses state because of inner and outer Steel plate Cylinder restriction,and the concrete utmost compressive strain reached -3900μe. The shaft lining is fairly plastic when it was damaged. By mutual restriction between Steel plate and concrete,their mechanical performances are improved; and shaft lining vertical bearing capacity increased evidently,which are far greater than sum of vertical ultimate bearing capacity of Steel Cylinder and middle concrete. Then a formula for calculating the shaft lining ultimate bearing capacity is given on the basis of the theoretical research and experimental results. Thus,the studied results can provide a reference for the theoretical study and engineering application of this kind of shaft lining structure.
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Numerical simulation on strength of composite shift lining of high strength concrete and double Steel Cylinder
Journal of Liaoning Technical University, 2004Co-Authors: Rong Chuan-xinAbstract:Aiming at the deep alluvium support of Juye Coalfield , the composite shift lining of high strength concrete and double Steel Cylinder is presented . An elastic and plastic finite element program is worked out to analyze this kind of shaft lining structure . Compared with experiment results, the calculating results are proved to be reliable . The program is applied to calculate and analyze the shaft lining structure , an equation for calculating the composite shift lining of high strength concrete and double Steel Cylinder is obtained , and the analysis of main factors that influence the loading capacity of the shaft lining is made . The results provide basis for optimal design of the shaft lining structure .
J. F. Wardell - One of the best experts on this subject based on the ideXlab platform.
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the scaled thermal explosion experiment
2002Co-Authors: J. F. Wardell, J L MaienscheinAbstract:We have developed the Scaled Thermal Explosion Experiment (STEX) to provide a database of reaction violence from thermal explosion for explosives of interest. Such data are needed to develop, calibrate, and validate predictive capability for thermal explosions using simulation computer codes. A Cylinder of explosive 25, 50 or 100 mm in diameter, is confined in a Steel Cylinder with heavy end caps, and heated under controlled conditions until reaction. Reaction violence is quantified through non-contact micropower impulse radar measurements of the Cylinder wall velocity and by strain gauge data at reaction onset. Here we describe the test concept, design and diagnostic recording, and report results with HMX- and RDX-based energetic materials.
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Thermal explosion violence of HMX-based explosives -- effect of composition, confinement and phase transition using the scaled thermal explosion experiment
2000Co-Authors: J L Maienschein, J. F. Wardell, John E. ReaughAbstract:We developed the Scaled Thermal Explosion Experiment (STEX) to provide a database of reaction violence from thermal explosion of explosives of interest. A Cylinder of explosive, 1, 2 or 4 inches in diameter, is confined in a Steel Cylinder with heavy end caps, and heated under controlled conditions until it explodes. Reaction violence is quantified by micropower radar measurement of the Cylinder wall velocity, and by strain gauge data at reaction onset. Here we describe the test concept and design, show that the conditions are well understood, and present initial data with HMX-based explosives. The HMX results show that an explosive with high binder content yields less-violent reactions that an explosive with low binder content, and that the HMX phase at the time of explosion plays a key role in reaction violence.
J R Martin - One of the best experts on this subject based on the ideXlab platform.
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surface modification and tribological behaviour of titanium and titanium alloys after yag laser treatments
Surface & Coatings Technology, 1998Co-Authors: C Langlade, A B Vannes, J M Krafft, J R MartinAbstract:Commercially pure Ti and Ti alloys substrates have been treated using a YAG-Nd laser radiation (1.06 μm). A large range of laser parameters have been tested resulting in very different coloured layers. X-rays diffraction and Raman spectroscopy have been performed in order to characterize the composition and crystalline structure of the coatings. Their roughness and thickness were also measured. Their tribological properties have been evaluated under fretting conditions against a 52 100 Steel Cylinder and compared with the fretting behaviour of uncoated samples. The evolution of composition and structure of the coating during friction has been studied.
Joseph E. Bishop - One of the best experts on this subject based on the ideXlab platform.
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Simulation and experimental comparison of the thermo-mechanical history and 3D microstructure evolution of 304L stainless Steel tubes manufactured using LENS
Computational Mechanics, 2018Co-Authors: Kyle L. Johnson, Theron M. Rodgers, Olivia D. Underwood, Jonathan D. Madison, Kurtis R. Ford, Shaun R. Whetten, Daryl J. Dagel, Joseph E. BishopAbstract:Additive manufacturing enables the production of previously unachievable designs in conjunction with time and cost savings. However, spatially and temporally fluctuating thermal histories can lead to residual stress states and microstructural variations that challenge conventional assumptions used to predict part performance. Numerical simulations offer a viable way to explore the root causes of these characteristics, and can provide insight into methods of controlling them. Here, the thermal history of a 304L stainless Steel Cylinder produced using the Laser Engineered Net Shape process is simulated using finite element analysis (FEA). The resultant thermal history is coupled to both a solid mechanics FEA simulation to predict residual stress and a kinetic Monte Carlo model to predict the three-dimensional grain structure evolution. Experimental EBSD measurements of grain structure and in-process infrared thermal data are compared to the predictions.
