The Experts below are selected from a list of 4785 Experts worldwide ranked by ideXlab platform
Michael J. Forrestal - One of the best experts on this subject based on the ideXlab platform.
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Penetration equations for Ogive-nose rods into aluminum targets
International Journal of Impact Engineering, 2008Co-Authors: Michael J. Forrestal, Thomas L. WarrenAbstract:Abstract We present penetration equations for rigid, Ogive-nose, rod projectiles that penetrate aluminum targets at normal impact. Comparisons of depth of penetration data and predictions from a previously published penetration equation derived from spherical, cavity-expansion methods show excellent agreement for striking velocities to 1800 m/s. We then identify a small parameter in the penetration equation, perform a power-series expansion, and obtain approximate penetration equations. These approximate equations are very accurate for striking velocities to 1300 m/s and display clearly the dominant problem parameters.
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penetration of concrete targets with Ogive nose steel rods
International Journal of Impact Engineering, 1998Co-Authors: D J Frew, S J Hanchak, M L Green, Michael J. ForrestalAbstract:Abstract We conducted depth of penetration experiments in concrete targets with 3.0 caliber-radius-head, steel rod projectiles. The concrete targets with 9.5 mm diameter limestone aggregate had a nominal unconfined compressive strength of 58.4 MPa (8.5 ksi) and density 2320 kg/m3. To explore geometric projectile scales, we conducted two sets of experiments. Projectiles with length-to-diameter ratio of ten were machined from 4340Rc 45 steel, round stock and had diameters and masses of 20.3 mm, 0.478 kg and 30.5 mm, 1.62 kg. Powder guns launched the projectiles to striking velocities between 400 and 1200 m/s. For these experiments, penetration depth increased as striking velocity increased. When depth of penetration data was divided by a length scale determined from our model, the data collapsed on a single curve. Thus, a single dimensionless penetration depth versus striking velocity prediction was in good agreement with the data at two geometric projectile scales for striking velocities between 400 and 1200 m/s. In addition, we conducted experiments with AerMet 100Rc 53 steel projectiles and compared depth of penetration and post-test nose erosion data with results from the 4340Rc 45 steel projectiles.
S J Hanchak - One of the best experts on this subject based on the ideXlab platform.
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Penetration Limit Velocity for Ogive-Nose Projectiles and Limestone Targets
Journal of Applied Mechanics, 2002Co-Authors: M.j. Forrestal, S J HanchakAbstract:We conducted depth-of-penetration experiments with Ogive-nose steel projectiles and limestone targets to determine the penetration limit velocity. The penetration limit velocity is defined as the minimum striking velocity required to embed the projectile in the target. For striking velocities smaller than the penetration limit velocity, the projectile rebounds from the target. ©2002 ASME
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Penetration Experiments with Limestone Targets and Ogive-Nose Steel Projectiles
Journal of Applied Mechanics, 2000Co-Authors: D J Frew, M.j. Forrestal, S J HanchakAbstract:We conducted three sets of depth-of-penetration experiments with limestone targets and 3.0 caliber-radius-head (CRH), Ogive-nose steel rod projectiles. The limestone targets had a nominal unconfined compressive strength of 60 MPa, a density of 2.31 kg/m{sup 3}, a porosity of 15%, and a water content less than 0.4%. The Ogive-nose rod projectiles with length-to-diameter ratios often were machined from 4340 R{sub c} 45 and Aer Met 100 R{sub c} 53 steel, round stock and had diameters and masses of 7.1 mm, 0.020 kg; 12.7 mm, 0.117 kg; and 25.4 mm, 0.931 kg. Powder guns or a two-stage, light-gas gun launched the projectiles at normal impacts to striking velocities between 0.4 and 1.9 km/s. For the 4340 R{sub c} 45 and Aer Met 100 R{sub c} 53 steel projectiles, penetration depth increased as striking velocity increased to a striking velocity of 1.5 and 1.7 km/s, respectively. For larger striking velocities, the projectiles deformed during penetration without nose erosion, deviated from the shot line, and exited the sides of the target. We also developed an analytical penetration equation that described the target resistance by its density and a strength parameter determined from depth of penetration versus striking velocity data.
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penetration of concrete targets with Ogive nose steel rods
International Journal of Impact Engineering, 1998Co-Authors: D J Frew, S J Hanchak, M L Green, Michael J. ForrestalAbstract:Abstract We conducted depth of penetration experiments in concrete targets with 3.0 caliber-radius-head, steel rod projectiles. The concrete targets with 9.5 mm diameter limestone aggregate had a nominal unconfined compressive strength of 58.4 MPa (8.5 ksi) and density 2320 kg/m3. To explore geometric projectile scales, we conducted two sets of experiments. Projectiles with length-to-diameter ratio of ten were machined from 4340Rc 45 steel, round stock and had diameters and masses of 20.3 mm, 0.478 kg and 30.5 mm, 1.62 kg. Powder guns launched the projectiles to striking velocities between 400 and 1200 m/s. For these experiments, penetration depth increased as striking velocity increased. When depth of penetration data was divided by a length scale determined from our model, the data collapsed on a single curve. Thus, a single dimensionless penetration depth versus striking velocity prediction was in good agreement with the data at two geometric projectile scales for striking velocities between 400 and 1200 m/s. In addition, we conducted experiments with AerMet 100Rc 53 steel projectiles and compared depth of penetration and post-test nose erosion data with results from the 4340Rc 45 steel projectiles.
D J Frew - One of the best experts on this subject based on the ideXlab platform.
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Penetration Experiments with Limestone Targets and Ogive-Nose Steel Projectiles
Journal of Applied Mechanics, 2000Co-Authors: D J Frew, M.j. Forrestal, S J HanchakAbstract:We conducted three sets of depth-of-penetration experiments with limestone targets and 3.0 caliber-radius-head (CRH), Ogive-nose steel rod projectiles. The limestone targets had a nominal unconfined compressive strength of 60 MPa, a density of 2.31 kg/m{sup 3}, a porosity of 15%, and a water content less than 0.4%. The Ogive-nose rod projectiles with length-to-diameter ratios often were machined from 4340 R{sub c} 45 and Aer Met 100 R{sub c} 53 steel, round stock and had diameters and masses of 7.1 mm, 0.020 kg; 12.7 mm, 0.117 kg; and 25.4 mm, 0.931 kg. Powder guns or a two-stage, light-gas gun launched the projectiles at normal impacts to striking velocities between 0.4 and 1.9 km/s. For the 4340 R{sub c} 45 and Aer Met 100 R{sub c} 53 steel projectiles, penetration depth increased as striking velocity increased to a striking velocity of 1.5 and 1.7 km/s, respectively. For larger striking velocities, the projectiles deformed during penetration without nose erosion, deviated from the shot line, and exited the sides of the target. We also developed an analytical penetration equation that described the target resistance by its density and a strength parameter determined from depth of penetration versus striking velocity data.
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penetration of concrete targets with Ogive nose steel rods
International Journal of Impact Engineering, 1998Co-Authors: D J Frew, S J Hanchak, M L Green, Michael J. ForrestalAbstract:Abstract We conducted depth of penetration experiments in concrete targets with 3.0 caliber-radius-head, steel rod projectiles. The concrete targets with 9.5 mm diameter limestone aggregate had a nominal unconfined compressive strength of 58.4 MPa (8.5 ksi) and density 2320 kg/m3. To explore geometric projectile scales, we conducted two sets of experiments. Projectiles with length-to-diameter ratio of ten were machined from 4340Rc 45 steel, round stock and had diameters and masses of 20.3 mm, 0.478 kg and 30.5 mm, 1.62 kg. Powder guns launched the projectiles to striking velocities between 400 and 1200 m/s. For these experiments, penetration depth increased as striking velocity increased. When depth of penetration data was divided by a length scale determined from our model, the data collapsed on a single curve. Thus, a single dimensionless penetration depth versus striking velocity prediction was in good agreement with the data at two geometric projectile scales for striking velocities between 400 and 1200 m/s. In addition, we conducted experiments with AerMet 100Rc 53 steel projectiles and compared depth of penetration and post-test nose erosion data with results from the 4340Rc 45 steel projectiles.
Fenglei Huang - One of the best experts on this subject based on the ideXlab platform.
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Penetration performance of double-Ogive-nose projectiles
International Journal of Impact Engineering, 2015Co-Authors: Jiancheng Liu, Fenglei HuangAbstract:Abstract The penetration ability of projectiles is closely related to their nose shape as this influences the high-velocity or ultrahigh-velocity kinetic-energy penetration of a rigid projectile. Based on classical cavity expansion theory and a double-Ogive-nose scheme, this study set out to analyze the dependency relationship between the nose shape factor N∗ and the double-Ogive characteristic parameters. This paper first discusses the effects of different nose shapes on the penetration performance of a projectile. The paper then proposes a double-Ogive-nose penetration body scheme with a low penetration resistance. A penetration experiment with the double-Ogive-nose projectile is set up and a Holmquist–Johnson–Cook concrete [1] model is described, together with its application to the prediction of the tendency of the depth of penetration. A comparison between the results of the experiment, simulation, and calculation for the Ogive nose and double-Ogive-nose projectiles proves that the analysis and the proposed method are both reasonable and feasible.
Thomas L. Warren - One of the best experts on this subject based on the ideXlab platform.
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Penetration equations for Ogive-nose rods into aluminum targets
International Journal of Impact Engineering, 2008Co-Authors: Michael J. Forrestal, Thomas L. WarrenAbstract:Abstract We present penetration equations for rigid, Ogive-nose, rod projectiles that penetrate aluminum targets at normal impact. Comparisons of depth of penetration data and predictions from a previously published penetration equation derived from spherical, cavity-expansion methods show excellent agreement for striking velocities to 1800 m/s. We then identify a small parameter in the penetration equation, perform a power-series expansion, and obtain approximate penetration equations. These approximate equations are very accurate for striking velocities to 1300 m/s and display clearly the dominant problem parameters.
