|
With the rapid development of the space industry , an increasing number of space debris , a serious threat to human spaceflight activities . A variety of space debris , reliable the space protection design based on spherical projectile . Therefore , we must study the dumbbell-shaped tiles , tetrahedral and octahedral projectile hypervelocity impact fenders in damage and destruction of law , non - spherical projectiles and spherical projectiles hypervelocity impact fenders in the characteristic length , characteristic velocity feature quality , the characteristics of the loss of the front panel , rear plate injury characteristics gaps for space protection structure designed to provide the basis and reference . The main content of this paper is as follows : First, the debris cloud formed by physical processes , describes the structure and morphology of the debris cloud , the front plate of the previous studies are summarized perforation law . Introduces the basic principles of the SPH ( smooth particle hydrodynamics ) algorithm , discrete equations of fluid dynamics control . Determine the material model used to simulate hypervelocity impact John-cook model , equation of state for the Mie-Gruneisen equation of state , and to verify the effectiveness of its parameters , the results show that the simulation and experimental results within the range of error allowed good agreement . After programming projectile model , numerical simulation programs . Secondly, the analysis of the characteristics of the non - spherical projectile and spherical Hypervelocity Impact Protection board , and a detailed discussion of the debris cloud characteristics length, characteristic velocity , characteristic mass , the former board loss characteristics , after plate injury characteristics with the thickness of the front plate , the collision speed , the variation of the plate spacing , and fitting the empirical formula . Determine the length of the non- spherical projectile debris cloud characteristics , the gap between the characteristic velocity characteristic mass characteristics of the front plate losses after plate injury characteristics and spherical projectile . Finally, the analysis of the characteristics of the non - spherical projectile and spherical projectile hypervelocity the oblique impact protection board , a detailed discussion of the debris cloud characteristics length, characteristic velocity , the variation of the front plate injury characteristics after plate injury characteristics versus the impact angle . Non- spherical projectile debris cloud characteristics length of the gap between the characteristic velocity , the front plate injury characteristics , injury characteristics of the rear panel , with spherical projectiles .
|