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| Author | : James Lankford |
| Publisher | : |
| Total Pages | : 12 |
| Release | : 1992 |
| Genre | : Continuum damage mechanics |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 500 |
| Release | : 1995 |
| Genre | : Aeronautics |
| ISBN | : |
| Author | : George A. Pantazopoulos |
| Publisher | : MDPI |
| Total Pages | : 476 |
| Release | : 2020-03-19 |
| Genre | : Technology & Engineering |
| ISBN | : 303928276X |
The era of lean production and excellence in manufacturing, advancing with sustainable development, demands the rational utilization of raw materials and energy resources, adopting cleaner and environmentally-friendly industrial processes. In view of the new industrial revolution, through digital transformation, the exploitation of smart and sophisticated materials systems, the need of minimizing scrap and increasing efficiency, reliability and lifetime and, on the other hand, the pursuit of fuel economy and limitation of carbon footprint, are necessary conditions for the imminent growth in a highly competitive economy. Failure analysis is an interdisciplinary scientific topic, reflecting the opinions and interpretations coming from a systematic evidence-gathering procedure, embracing various important sectors, imparting knowledge, and substantiating improvement practices. The deep understanding of material/component role (e.g., rotating shaft, extrusion die, gas pipeline) and properties will be of central importance for fitness for purpose in certain industrial processes and applications. Finally, it is hoped and strongly believed that the accumulation of additional knowledge in the field of failure mechanisms and the adoption of the principles, philosophy, and deep understanding of failure analysis process approach will strongly promote the learning concept, as a continuously evolving process leading to personal and social progress and prosperity.
| Author | : |
| Publisher | : |
| Total Pages | : 274 |
| Release | : 1991 |
| Genre | : Military research |
| ISBN | : |
| Author | : |
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| Total Pages | : 0 |
| Release | : 1998 |
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The effect of matrix volume fraction on the high shear strain-rate deformation and failure behavior of W-Ni-Fe heavy alloys is studied using the torsional Hopkinson bar apparatus. High strain-rate tests (at 700/s) were conducted using torsion specimens made from W-Ni-Fe alloys with three different matrix volume fractions. Different matrix volume fractions were obtained by changing the W content in the W-Ni-Fe alloy while keeping W grain size approximately constant. Experimental observations indicate that as the matrix volume fraction is decreased, the strain to failure decreases, at high rates of loading. There were no significant changes seen in the deformation behavior of the three materials at high shear strain-rate loading used in this study.
| Author | : |
| Publisher | : |
| Total Pages | : 20 |
| Release | : 1995 |
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This report presents the results of investigations into the deformation and failure of tungsten-based composites (tungsten heavy alloys) at very high strain rates. Several new experimental techniques developed during the course of the work include pressure-shear recovery, allowing the recovery of samples subjected to high-rate shearing deformations; the dynamic measurement of radial strains, and the continuous measurement of projectile velocities. The experimental results showed that the development of adiabatic shear localization in tungsten heavy alloys is influenced by a superimposed hydrostatic pressure. Experimental characterizations have been performed of the very high-rate response of tungsten composites with tungsten-nickel-iron and hafnium matrices. It has been shown that these materials must be treated as dual-phase composites. The addition of a hard particulate reinforcement is shown to result in a substantial increase in matrix rate-sensitivity in a model metal-matrix composite. A simple modeling approach has been developed that allows one to predict the dynamic mechanical properties of a particle-reinforced metal-matrix composite given only the properties of the matrix phase. jg.
| Author | : 0 Meyers, |
| Publisher | : CRC Press |
| Total Pages | : 1852 |
| Release | : 2023-07-21 |
| Genre | : Technology & Engineering |
| ISBN | : 1000950190 |
These proceedings of EXPLOMET 90, the International Conference on the Materials Effects of Shock-Wave and High-Strain-Rate Phenomena, held August 1990, in La Jolla, California, represent a global and up-to-date appraisal of this field. Contributions (more than 100) deal with high-strain-rate deforma
| Author | : |
| Publisher | : |
| Total Pages | : 200 |
| Release | : 1965 |
| Genre | : Metals |
| ISBN | : |
| Author | : Saideep Muskeri |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2021 |
| Genre | : |
| ISBN | : |
Fundamental understanding of high strain rate deformation behavior of materials is critical in designing new alloys for wide-ranging applications including military, automobile, spacecraft, and industrial applications. High entropy alloys, consisting of multiple elements in (near) equimolar proportions, represent a new paradigm in structural alloy design providing ample opportunity for achieving excellent performance in high strain rate applications by proper selection of constituent elements and/or thermomechanical processing. This dissertation is focused on fundamental understanding of high strain-rate deformation behavior of several high entropy alloy systems with widely varying microstructures. Ballistic impact testing of face centered cubic Al0.1CoCrFeNi high entropy alloy showed failure by ductile hole growth. The deformed microstructure showed extensive micro-banding and micro-twinning at low velocities while adiabatic shear bands and dynamic recrystallization were seen at higher velocities. The Al0.7CoCrFeNi and AlCoCrFeNi2.1 eutectic high entropy alloys, with BCC and FCC phases in lamellar morphology, showed failure by discing. A network of cracks coupled with small and inhomogeneous plastic deformation led to the brittle mode of failure in these eutectic alloys. Phase-specific mechanical behavior using small-scale techniques revealed higher strength and strain rate sensitivity for the B2 phase compared to the L12 phase. The interphase boundary demonstrated good stability without any cracks at high compressive strain rates. The Al0.3CoCrFeNi high entropy alloy with bimodal microstructure demonstrated an excellent combination of strength and ductility. Ballistic impact testing of Al0.3CoCrFeNi alloy showed failure by ductile hole growth and demonstrated superior performance compared to all the other high entropy alloy systems studied. The failure mechanism was dominated by micro-banding, micro-twining, and adiabatic shear localization. Comparison of all the high entropy alloy systems with currently used state-of-the-art rolled homogenous armor (RHA) steel showed a strong dependence of failure modes on microstructural features.
| Author | : |
| Publisher | : |
| Total Pages | : 656 |
| Release | : 1993 |
| Genre | : Science |
| ISBN | : |
