Constitutive Property Tests On Tuff To Determine Rate Effects
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| Author | : John Q. Ehrgott |
| Publisher | : |
| Total Pages | : 56 |
| Release | : 1973 |
| Genre | : Rock mechanics |
| ISBN | : |
The report documents the results of a limited number of static and dynamic tests on one tuff from the location of the Diamond Mine Event tunnel at the Nevada Test Site. The tests comprised the first experimental study conducted in the then newly developed dynamic high-pressure triaxial test device. The purpose of the study was to determine loading rate effects on the uniaxial strain, hydrostatic compression, and triaxial shear response of that tuff when loaded statically (approximately 2 minutes to peak stress) and dynamically (approximately 20 msec to peak stress). The results indicated that rate effects were of secondary importance when compared with the effects of variation of water content of specimens. Primary consideration should be given to testing the tuff at its in situ water content. (Author).
| Author | : Eric C. Drumm |
| Publisher | : |
| Total Pages | : 30 |
| Release | : 1985 |
| Genre | : Blast effect |
| ISBN | : |
The description of stress-time history acting on a buried structure is a major source of error in the analysis of underground structures to weapons loadings. The stress wave propagating spherically from the weapon is attenuated as it travels from the source. This attenuation is a function of the inelastic response of the soil, and results in an increase in the loading rise time or decrease in the loading rate. Since the inelastic soil response is a function of the loading rate, a wave propagation analysis should be conducted to determine the stresses on the structure. At the interface between the soil and structure, the stress is modified further by soil-structure interaction effects. Thus, the stress on the structure is a function of both the structural and soil properties as well as the distance traveled by the stress wave. These related phenomena can be included in a numerical analysis, but the accuracy depends on the constitutive representation of the materials. One-dimensional wave propagation experiments and impact tests with various soils are reviewed, and the attenuation as a function of the soil stress-strain response is discussed. Keywords include: Dynamic loads, Hardened structures, Explosive effects, Underground structures, Conventional weapons, Dynamic structural response, and Interaction.
| Author | : U.S. Army Engineer Waterways Experiment Station |
| Publisher | : |
| Total Pages | : 430 |
| Release | : 1976 |
| Genre | : Hydraulic engineering |
| ISBN | : |
| Author | : United States. Army. Corps of Engineers |
| Publisher | : |
| Total Pages | : 438 |
| Release | : 1976 |
| Genre | : |
| ISBN | : |
| Author | : John Qua Ehrgott (Jr.) |
| Publisher | : |
| Total Pages | : 100 |
| Release | : 1973 |
| Genre | : Grout (Mortar) |
| ISBN | : |
The report documents a study conducted on the Gulf Radiation Technology (GRT) piezoelectric stress gage in support of the Diamond Mine Event at the Nevada Test Site (NTS). The gage was first calibrated in oil and then embedded in an NTS grout and tested under conditions of uniaxial strain. The results of these tests indicated a slightly nonlinear output of the gage under hydrostatic loadings and an under registration of the gage when embedded in the grout. Limited uniaxial strain tests were concurrently conducted on the grout mix. The property information from these tests was used as input to the WESTES finite element code in which the test boundary conditions were simulated to analytically investigate behavior of the grout specimen with and without an embedded inclusion or gage. The calculated results indicated that the contact interface between the gage and the grout had the greatest effect on gage performance. (Author).
| Author | : David A. Dillard |
| Publisher | : Elsevier |
| Total Pages | : 1190 |
| Release | : 2023-06-10 |
| Genre | : Technology & Engineering |
| ISBN | : 0323984371 |
Advances in Structural Adhesive Bonding, Second Edition reviews developments in adhesive bonding for a range of advanced structural engineering applications. This new edition has been fully revised to include the latest advances in materials, testing and modeling methods, lifecycle considerations, and industrial implementation. Sections review advances in commonly used groups of structural adhesives, covering epoxy, acrylic, anaerobic and cyanoacrylate, polyurethane, and silicone adhesives, along with toughening. Other chapters cover various types of adherends and pre-treatment methods for structural materials, including metals, plastics, composites, wood and joint design and testing, including topics such as fracture mechanics, life prediction techniques, and advanced testing methods. This is a valuable guide for all those working with structural adhesives, including those in an industrial setting, adhesive specialists, structural engineers, design engineers, R&D professionals, and scientists, as well as academic researchers and advanced students in adhesives, joining technology, materials science and mechanical engineering. - Provides detailed coverage on the main adhesive groups, including epoxy, acrylic, cyanoacrylate, polyurethane and silicone adhesives - Includes the latest developments across adherends, pre-treatment methods, joint design and testing, durability and lifecycle related issues - Addresses environmental challenges, adhesive specification, quality control, and risk mitigation for specific industrial application areas
| Author | : |
| Publisher | : |
| Total Pages | : 964 |
| Release | : 1973 |
| Genre | : Engineering |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 272 |
| Release | : 1992 |
| Genre | : Radioactive waste disposal in the ground |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 592 |
| Release | : 1974 |
| Genre | : Mechanics, Applied |
| ISBN | : |
| Author | : King-Hay Yang |
| Publisher | : Academic Press |
| Total Pages | : 754 |
| Release | : 2017-09-22 |
| Genre | : Science |
| ISBN | : 0128098325 |
Basic Finite Element Method as Applied to Injury Biomechanics provides a unique introduction to finite element methods. Unlike other books on the topic, this comprehensive reference teaches readers to develop a finite element model from the beginning, including all the appropriate theories that are needed throughout the model development process. In addition, the book focuses on how to apply material properties and loading conditions to the model, how to arrange the information in the order of head, neck, upper torso and upper extremity, lower torso and pelvis and lower extremity. The book covers scaling from one body size to the other, parametric modeling and joint positioning, and is an ideal text for teaching, further reading and for its unique application to injury biomechanics. With over 25 years of experience of developing finite element models, the author's experience with tissue level injury threshold instead of external loading conditions provides a guide to the "do's and dont's" of using finite element method to study injury biomechanics. - Covers the fundamentals and applications of the finite element method in injury biomechanics - Teaches readers model development through a hands-on approach that is ideal for students and researchers - Includes different modeling schemes used to model different parts of the body, including related constitutive laws and associated material properties
