Download or read book Effects of Projectile Shape on Thin Plate Perforation at Normal Incidence written by R. T. Sedgwick and published by . This book was released on 1971 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analytical, numerical and experimental results are compared in a systematic investigation of the effects of projectile shaped on thin plate perforation. The analysis of five low velocity impact involving optimal-, ogival-, Russian-, conical- and cylindrical-head projectile comprise the study. A three-way comparison of simple perforation theory predictions, HELP numerical solutions and available experimental data is made for the five problems. The HELP solutions are in excellent agreement with the experimental data. Although the simple perforation formulas are sensitive to projectile shape, they do not provide adequate residual energy predictions. Further numerical studies of this type should provide additional insight into the penetration process and eventually lead to improved perforation formulas. (Author).
Download or read book The Effect of Projectile Shape on the Ballistic Perforation of Thin Metal Plates written by Thomas E. Fields and published by . This book was released on 1969 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of projectile shape on thin target perforation was investigated for five projectile shapes impacting aluminum and steel targets at 506 m/sec. A discarding sabot technique was developed for launching the unjacketed steel projectiles and accurate perforation velocity losses were measured using a ballistic pendulum with the targets mounted in the center of the pendulum. The five projectile shapes included two pointed ogives, a shape similar to a Russian 14.5 mm AP core, a cylinder and a cone. The two ogive shapes were the most efficient penetrators while the velocity loss of the Russian projectile averaged 15% higher. The cone, which caused a combined petaling and plugging target failure, was the least effective shape. Calculations with two approximate perforation theories predicted smaller velocity losses than were found experimentally. (Author).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1981 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of an International Conference on Dynamic Crack Propagation written by George C. Sih and published by Springer. This book was released on 1973 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: The planning meeting for a conference on Dynamic Crack Propagation was held at M.LT. in February 1971 and attended by research workers from several industrial, governmental and academic organizations. It was felt that a more specialized meeting would provide a better opportunity for both U.S. and foreign researchers to exchange their ideas and views on dynamic fracture, a subject which is seldom emphasized in national or international fracture conferences. Dynamic crack propagation has been a concern to specialists in many fields: continuum mechanics, metallurgy, geology, polymer chemistry, orthopedics, applied mathematics, as well as structural design and testing. It impinges on a wide variety of problems such as rock breaking and earthquakes, pressure vessels and line pipes, comminution and the per formance of armament and ordnance, etc. Advances have been numerous, covering theories and experiments from both the microscopic and macro scopic points of view. Hence, the need for comparing the theoretical and experimental results and bridging the gaps between the atomistic and continuum approaches must be constantly emphasized. It also appeared that the overall problem of dynamic fracture could benefit from a con solidation of crack models proposed for the various types of materials: metals, ceramics, composites, rocks, glasses, polymers and biomaterials.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1985 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies in the Perforation of Thin Metallic Plates by Projectile Impact I Normal Impact of Circular Cylinders written by L. E. Fugelso and published by . This book was released on 1966 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ballistic parameters were determined analytically and experimentally for the perforation of aluminum alloy and titanium alloy plates by normal impact of steel cylinders. Analytical predictions of the perforation parameters were prepared on the basis of theoretical models of the perforation process. Experimental determination of the critical perforation and residual velocities discriminated among the various models and further experimentation verified the analytical description of the perforation process. One model of perforation was found which adequately describes the ballistic parameters for the normal impact of steel cylinders into aluminum alloy and titanium alloy plates for impact velocities up to 5000ft/sec and plate thicknesses up to 0.25 inches.
Download or read book Dimple Spall and Perforation Characteristics of Thin Plates of Nine Materials Under Hypervelocity Impact written by Nestor Clough and published by . This book was released on 1970 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Experimental Investigation of Perforation of Thin Plates written by Tse-Wei Liu and published by . This book was released on 1965 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hypervelocity Impact Phenomena written by Karl R. Becker and published by . This book was released on 1962 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: The parameters governing the failure of thin metal plates under the impact of high-speed fragments are being studied; special emphasis is placed on the lightweight structural alloys. The geometrical features of the perforations, together with the spatial, mass, and velocity distributions of the ejecta produced in the perforation process, are considered. A few select target materials e.g., Al and Pb are currently being investigated under impact conditions that involve the same projectile geometry but different impact velocities. (Author).
Download or read book NASA Technical Note written by and published by . This book was released on 1964 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Estimation of Tolerance Limits for Meteoroid Hazard to Space Vehicles 100 500 Kilometers Above the Surface of the Earth written by Charles C. Dalton and published by . This book was released on 1964 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Normal Impact and Perforation of Thin Plates by Hemispherically Tipped Projectiles I Analytical Considerations written by N. Levy and published by . This book was released on 1984 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reprint is about a very elementary analysis of the penetration and performation processes involved in normal impact of thin plates by hemispherically-tipped cylindrical hard-steel projectiles. It is principally directed towards the determination of the force and central plate deflection histories both below and above the ballistic limit. These parameters are considered to be two of the most important facets of the event, and they can be evaluated rapidly and with negligible computational cost. The theory is based on a lumped-parameter system that includes the radial variation in axial target displacement and is completely predictive below the ballistic limit, but requires either measured information from the plug separation process or corresponding reasonable geometric and kinematic assumptions for a solution in the perforation domain. Surprisingly, considering the simplicity of the theoretical approach, the calculated values were found to be in excellent agreement below and in reasonable correspondence above the ballistic limit with data for soft aluminum targets. Somewhat greater deviations between predictions and measurements for mild steel plates are attributed to the neglect of rate effects in the constitutive description of this material. In spite of the existence of a variety of more complicated phenomenological representations, the current model appears to be the only one that forecasts the drop in peak force upon initiation of perforation and the subsequent simultaneous motion of plug and target plate; both of these features were verified by experiment. Keywords: Impact tests; Perforations; Thin plates; Steel plates.
Download or read book Recent Advances in Engineering Science written by Society of Engineering Science and published by . This book was released on 1977 with total page 1408 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Annual Department of Defense Bibliography of Logistics Studies and Related Documents written by United States. Defense Logistics Studies Information Exchange and published by . This book was released on 1985 with total page 1086 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transactions of the Conference of Arsenal Mathematicians written by and published by . This book was released on 1980 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Impact written by Werner Goldsmith and published by Courier Corporation. This book was released on 2001-11-01 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carefully organized, skillfully written text examines stereomechanical impact; vibrational aspects of impact; contact phenomena produced by the impact of elastic bodies; dynamic processes involving plastic strains; results of impact experiments and dynamic properties of materials. Well-illustrated treatment presumes some knowledge of partial differential equations, operational calculus, and elasticity. 284 illustrations.
Download or read book NASA SP written by and published by . This book was released on 1965 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
