Hypervelocity Impact Characteristic Investigation Of Space Debris Aluminum Mesh Bumper

With the development of human space exploring, the space environment keeps deteriorating. The ever-increasing of space debris has became a more serious hazard to space flights. This proposes an urgent demand to design effective shielding for spacecraft against space debris. Mesh-like shield is a breakthrough to traditional principle of making effective meteorite bumper constructed from contiguous sheet-like material. In this dissertation, The hypervelocity impact characteristics of domestic aluminum alloy mesh-like shield were studied making advantage of numerical simulation and experiment techniques.A two-stage light gas gun was used to carry out hypervelocity normal impact experiment study of aluminum mesh / plate dual-bumper shields. The fragmentation and dispersal of hypervelocity particle against mesh bumpers varying with material and specification were analyzed. At similar impact velocity, hypervelocity impact characteristics comparison with sheet-like dual-bumper shields of equal areal mass was thrust. Their hypervelocity damage characteristics difference was investigated. And assess of hypervelocity impact protection performance of mesh / plate dual-bumper shields was acquired.Based on traditional ballistic limit curve, optimum design and experimental assessment was made of hypervelocity impact protection performance of mesh / plate dual-bumper shields of different mesh specification. The experiments used 3.97 and 6.35 mm diameter spherical projectiles at velocity 2.5km/s~5.0km/s and the shields were formed by combination of aluminum plates and 5052 aluminum mesh of three kinds of wire diameter and three kinds of aluminum wire mesh spacing, mesh is located behind the plate. Ballistic limit of different mesh shields in the experimental speed range was acquired. Compared with sheet-like dual-bumper shields of equal areal mass, acquired the best mesh specification that has a superior protection performance to sheet bumper of equal areal mass. Then carried out an experimental optimum study of bumper structure made of mesh and plate.Accomplished geometric modeling of meshes used in experiment. Hypervelocity normal impact behavior of two kinds of mesh shields was obtained by numerical simulation. Comparing with experiment results, good agreement appeared. Hypervelocity normal impact debris distribution of mesh bumper was investigated by numerical simulation. Obtained influence of different impact point on morphology and energy characteristics of debris cloud. Explored how superimposing schemes of multiple-mesh targets affect their protection performance.