4/9/2023 0 Comments Impact isaleInternational Journal of Impact Engineering 5: 343– 355. International Journal of Impact Engineering 17: 375– 386. Modelling of microparticle hypervelocity oblique impacts on thick targets. Two- and three-dimensional asteroid impact simulations.Ĭomputing in Science and Engineering 6: 46– 55. A study of the origin of its features.īulletin of the Philosophical Society of Washington 12: 241– 292. The nature of the lunar surface, edited byīaltimore, MD: The Johns Hopkins Press. Interpreting ranger photographs from impact cratering studies. Proceedings, 9th Lunar and Planetary Science Conference. Experimental studies of oblique impact (abstract). Scaling of oblique impacts in frictional targets: Implications for crater size and formation mechanisms. Proceedings, 11th Hypervelocity Impact Society Symposium, in press. iSALE-3D: A three dimensional, multi-material, multi-rheology hydrocode and its applications to large-scale geodynamic processes. The size-frequency distribution of elliptical impact craters.Įarth and Planetary Science Letters, doi:10.1016/j.epsl.2011.07.023. Meteoritics & Planetary Science 39: 217– 231. Modeling damage and deformation in impact simulations. International Journal of Impact Engineering 14: 157– 168. Highly oblique impacts into thick and thin targets. Tucson, AZ: The University of Arizona Press. Journal of Geophysical Research 103: 22761– 22774. Crater ellipticity in hypervelocity impacts on metals. Interpreting the elliptical crater populations on Mars, Venus, and the Moon. Computational methods in Lagrangian and Eulerian hydrocodes.Ĭomputer Methods in Applied Mechanics and Engineering 99: 235– 394. Geochemistry Geophysics Geosystems 5: Q11016. Investigating the Lake Bosumtwi impact structure: Insight from numerical modeling. Numerical modeling of tektite origin in oblique impacts: Implication to Ries-Moldavites strewn field.īulletin of the Czech Geological Survey 77: 303– 311. Launch of Martian meteorites in oblique impacts. International Journal of Impact Engineering 5: 33– 59. Los Alamos National Laboratories Report LA-8095.105 p. SALE: A simplified ALE computer program for fluid flow at all speeds. Los Alamos National Laboratories Report LA-8905.151 p. SALE-3D: A simplified ALE computer program for calculating three-dimensional fluid flow. Our simulations of impacts on ductile targets also support the prediction from Chapman and McKinnon (1986) that cratering efficiency depends on only the vertical component of the velocity vector. We find that the elliptical threshold angle decreases with decreasing target strength, and hence with increasing cratering efficiency. iSALE-3D is also used to investigate the effect of target strength on oblique incidence impact cratering. The simulated craters show excellent agreement with both the crater size and morphology of the laboratory experiments. Digital elevation models of craters formed in laboratory experiments were created from stereo pairs of scanning electron microscope images, allowing the size and morphology to be directly compared with the iSALE-3D craters. In this work, the three-dimensional shock physics code iSALE-3D is validated against laboratory experiments of impacts into a strong, ductile target material. Three-dimensional numerical modeling offers a unique opportunity to study the individual effects of both impact angle and target strength however, a systematic study of these two parameters has not previously been performed. Herein, we test the hypothesis that the threshold for oblique crater asymmetry depends on target material strength. Experimental results at approximately constant impact velocity suggest that the elliptical threshold angle depends on target material properties. Laboratory experiments and numerical models have shown that crater size decreases with impact angle, the along-range crater profile becomes asymmetric at low incidence angles, and below a certain threshold angle the crater planform becomes elliptical. However, many of the effects of obliquity on impact crater size and morphology are poorly understood. Abstract– The majority of meteorite impacts occur at oblique incidence angles.
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