The threats considered in this programme are the numerous orbiting debris which may affect the satellites mission as a result of hypervelocity impact onto the spacecraft external walls. We present here the results of a systematic numerical. Simulation of characteristics of debris cloud produced by. Pdf numerical simulation of hypervelocity impacts on aluminum. Discrete particle method for simulating hypervelocity. Related simulations must be vetted through code validation by benchmarking against relevant laboratoryscale hypervelocityimpact experiments.
Simulation of hypervelocity impact of a whipple shield. Hypervelocity impact on honeycomb target structures. But the existing commercial computing software cant simulate foams against hypervelocity impact, for they have no appropriate foam model. In this work a material model for cfrp, which is representative of satellite wall structures, was developed and validated by comparing numerical simulations to planar plate impact and hypervelocity impact tests. Nafems hypervelocity impact simulation on hard ballistic. Simscale is a cloudbased web application that plays a key part in simulation software for many kinds of industries. Simulation of hypervelocity impact effects on reinforced. Oblique hypervelocity impact simulation for multilayer. Damage due to hypervelocity impact hvi of micrometeoroid and space debris mmod is a common threat in the current space environment for any spacecraft orbiting the earth and for future launches.
Cylindrically symmetric sph simulations of hypervelocity. Software predicts impacts of orbital debris on spacecraft. Numerical simulations of laboratoryscale, hypervelocity. Numerical analysis of hypervelocity impact problems with. In this paper, we introduce a computational model for the simulation of hypervelocity impact hvi phenomena which is based on the discrete element method dem. Our two stage light gas guns simulate hypervelocity orbital debris impacts and are capable of firing projectiles at speeds up to 24,000 feet per. Lassig in support of their presentation at the 2015 nafems world congress that was held in san diego, usa on 2124th june 2015. Simulation of hypervelocity impact on massively parallel. We present here the results of a systematic numerical study on hvi of solids. In many cases, hypervelocity impact simulation models are based on many. The team has performed thousands of hypervelocity impact tests that have yielded numerous efficient and effective shielding designs, as well as detailed data on the effect of mmod impact on various spacecraft components.
Simulation of hypervelocity impacts using a contact charge. Simulation of hypervelocity spacecrafts and orbital debris. Hypervelocity impact testing on simulated lunar materials. In the software program, an eulerian method consisting of an improved cese spacetime conservation element and solution element method scheme is used. Numerical simulation of hypervelocity impact problem for spacecraft. Firstorder simulation of strewn debris fields accompanying exoatmospheric reentry vehicle fragmentation by hypervelocity impact. Hypervelocity impact of an aluminum sphere on an aluminumkevlar orbital debris shield. Simulation of hypervelocity spacecrafts and orbital debris collisions using smoothed particle hydrodynamics in lsdyna j.
Massively parallel optimal transportation meshfree otm simulation of hypervelocity impacts. A numerical simulation was conducted with ansyslsdyna software to. Radio frequency emission from hypervelocity impact plasma. Read hypervelocity impact on honeycomb target structures. Nasa contractor report 4343 hypervelocity impact physics willam p. Modeling and simulation of hypervelocity impact against debris. Impact is an explicit finite element program suite which simulates dynamic impact events. Discrete particle method for simulating hypervelocity impact. Simulation of hypervelocity impact of a whipple shield wayne l. In order to meet these challenges, we develop an optimal transportation meshfree otm method for simulating extremely large. In many cases, hypervelocity impact simulation models are based on many simplifications that affect the accuracy of these simulations. What looks like a mushroom cloud turned sideways is actually the instant an 2. These images are results of a computational simulation of hypervelocity impact.
Moreover, numerical modeling of the satellite tank under hypervelocity impact can. Ara is involved in the analysis of impact and penetration problems for a variety of applications including armor and antiarmor development, light armor for vehicle protection, bullet proof. Much of space plasma research has focused on largescale changes in the ambient plasma and fields from the sun to the earths atmosphere. Oblique hypervelocity impact simulation for multilayer orbital debris shielding.
Simulation models developed in the impetus afea gamma sph solver show that the physical measurements of impact cratering and bulge are in reasonable agreement with simulation results. All spacecraft in low orbit are subject to hypervelocity impacts by meteoroids and space debris. New twostage accelerator for hypervelocity impact simulation. A void growth model which takes the bauschinger effect. What conditions cause impact plasmas to create rf emission and what is the power dependence on frequency. Cylindrically symmetric sph simulations of hypervelocity impacts on. Lsdyna theoretical manual, livermore software technology corporation. Discrete element method, hypervelocity impact, debris.
The paper is aimed at modeling results of hypervelocity impact of space debris fragments on. In this paper we introduce a computational model for the simulation of hypervelocity impact hvi phenomena which is based on the discrete element method dem. Dyna software was used to carry out these numerical simulations. Specialised imaging reports on how the institute of astronautics, technical university of munich, germany has used a simx ultrahigh speed framing camera to record high resolution images of hypervelocity impacts on granular media samples with different bulk densities. Simulation results agreed with experimental tests and showed that the hc core cell. Modeling of hypervelocity impact experiments using gamma. The calculations were performed using lsdyna explicit software. Velocity profiles are in general agreement with the experiments capturing all the major features observed experimentally. With further development, the simulation technique employed in the exos package could be adapted for use in structural applications. In the study, a software program named super cese is developed for the simulation of hypervelocity impact problems with large deformations, high strain rates and spall fractures. Experiments and modeling, international journal of impact engineering on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Simulation of hypervelocity impact on massively parallel supercomputer h. Our paper constitutes the first application of dem to the modeling and simulating of impact events for velocities beyond 5 kms. These examples are modeling of hypervelocity impact on a foamcore sandwich panel and simulation of hvicfrp composites fabricated by filament winding.
And the existing equation of state and strength model. Chapter 6 simulation of hypervelocity impact effects on reinforced carboncarbon youngkeun park1 and eric p. Final report, author close, sigrid, abstractnote the space environment is fraught with complex plasmas spanning a wide range of densities and temperatures. The results offer good agreement between simulations and experiments. The dynamic response of the al6061t6 plate including phase. The numerical simulations of characteristics of debris cloud produced by an aluminum sphere projectile hypervelocity impact on different material bumpers at normal. However, these numerical simulations require the identification of a large number of parameters that are needed to describe the nonlinearities of the problem. Hydrodynamic ram effect caused by debris hypervelocity impact.
Experiments and simulations of hypervelocity impact. Modeling and simulation of hypervelocity impact against debris shields for. Because experimental results can be obtained only in the low velocity region below 7 kms, it is required to derive the ballistic limit curve blc in the high velocity region above 7 kms by numerical simulation. Introduction hypervelocity impact studies are important for debris shield and a. Mike walker 66 department of mechanical engineering with strong background in solid mechanics and hypervelocity impact damage mechanics. Eliot fang computational physics and mechanics department sandia national laboratories albuquerque, new mexico, u. Impact modeling with smoothed particle hydrodynamics, international journal of impact engineering 1993. Anylogic ple is a free simulation tool for the purposes of education and selfeducation. An sph capability implemented into the autodyn2d software has been used to simulate hypervelocity impacts on thin whipple shield type target plates.
Get the latest updates on nasa missions, watch nasa tv live, and learn about our quest to reveal the unknown and benefit all humankind. What are the properties of hypervelocity impact plasmas. Specialised imaging hypervelocity impact testing on. Pdf numerical simulations of hypervelocity impacts on bumper shield systems have been carried out using the autodyn hydrocodes. The energy flash of a hypervelocity impact during a laboratory simulation of what happens when a piece of orbital debris hits a spacecraft in orbit.
Abstract two sets of hypervelocity impact experiments have been performed in the open using a contact charge. Galletb, a consultant lstc rue des pyrenees, f330 grenade s garonne bensica 1 place emile blouin, f31056 toulouse cedex 5 abstract this paper is devoted to the results of simulations of hypervelocity impacts on thin. Large scale optimal transportation meshfree otm simulation of hypervelocity impact test. Study of hypervelocity projectile impact on thick metal plates. The nasa hypervelocity impact technology hvit team has analyzed many spacecraft and conducted thousands of hypervelocity impact tests since its inception almost four decades ago.
Pdf hypervelocity impact simulation on hard ballistic. Bean, and kent darzi university of alabamahuntsville huntsville, alabama. Autodyn2d, the commercial hydrocode package, was used to simulate the nonlinear transient analysis for the hypervelocity impact. Hypervelocity impact simulation on hard ballistic composites. Hvi experiments using cegs persephone twostage light gas gun in order to provide reference data to assess the ouranos simulation software that was then used intensively during the second phase of the study. These impacts can damage spacecraft flightcritical systems, which can in turn lead to catastrophic failure of the spacecraft. It has a range of elements, contact handling and different material laws. Academics, students and industry specialists around the globe use this free simulation software to learn, teach, and explore the world of simulation. Hypervelocity impact simulation on hard ballistic composites this paper was authored by m. Read cylindrically symmetric sph simulations of hypervelocity impacts on thin plates, international journal of impact engineering on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Ansys autodyn includes simulation capabilities for the response of materials to short duration severe loadings from impact, high pressure or explosions. To this end, we compare simulation results from spheral, an adaptive smoothedparticle hydrodynamics asph code, to the fragmentmass and velocity data from the 1991 twostage light gasgun impact. Hypervelocity is very high velocity, approximately over 3,000 meters per second 6,700 mph, 11,000 kmh.
Our paper constitutes the first application of dem to the modeling and simulating of impact events for velocities beyond 5 kms1. Visualisation of a hypervelocity impact, technische universitat munich, germany 1994. Download anylogic ple simulation software for free and join them. How does the ambient environment around the spacecraft, including the background magnetic and electric fields and plasma density, influence the hypervelocity impact plasmas. However the accurate simulation of hypervelocity impact is a grand challenge in scientific computing that places exacting demands on physics models, numerical solvers and computing resources. Explosives, fracturing, fragments, hypervelocity impact, simulation, computer programs, framing cameras, rotation, size dimensions, targets, velocity. Engineers and technicians design, test, and analyze spacecraft systems to reduce the risk from mmod particle impact. Oblique hypervelocity impact simulation for multilayer orbital debris shielding by fahrenthold, eric p. Large scale threedimensional numerical simulations of hypervelocity impact of aluminum alloy 6061t6 plates by nylon 66 cylindrical projectile have been performed using the optimal transportation meshfree otm method of li et al.
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