알루미나의 방탄특성에 대한 입경의 영향

Effect of Grain Size on the Ballistic Performance of Alumina Ceramics

  • 발행 : 1992.04.01

초록

Two kinds of alumina specimens with different grain size (1 and 51 $\mu\textrm{m}$) but same density were prepared by hot-pressing. Fracture strength and fracture toughness of these specimens at low strain rate, sonic velocity, and elastic property were evaluated. Ballistic performance against Cal. 50 AP projectile was characterized by thick-backing method by using A16061-T6 reference block. Mechanical properties measured at low strain rate showed that the specimen with samll grain (SG) were better than specimen with large grain (LG). Fracture strength and fracture toughness of LG specimen were 131 MPa and 3.01 MPa{{{{ SQRT { m} }}, but those of SG specimen were 349 and 4.23, respectively. Sonic velocity and elastic properties of these specimen were similar, but bulk velocity and bulk modulus were different at amount of 4 and 9%. The tendency of ballistic performance was not consistent with the mechnaical properties at low strain rate. The ballistic performance based on quantitative efficiency revealed that the LG specimen (5.13) was ballistically better than the SG specimen (4.00) in spite of their lower mechanical properties.

키워드

참고문헌

  1. Ballistic Materials;Penetration mechanics R.C. Laible
  2. Ceram Bull v.70 no.6 Development and Current Status and Armor Ceramics D.J. Viechnicki;M.J. Slavin;M.I. Kliman
  3. Tech. Report Third Progress Report of Light Armor Program M.L. Wilkins
  4. Tech. Report Fourth Progress Report of Light Armor Program M.L. Wilkins;C.F. Cline;C.A. Honodel
  5. Tech. Report Fifth Progress Report of Light Armor Program M.L. Wilkins;R.L. Landingham;C.A. Honodel
  6. Int. J. Impact Eng. v.9 no.4 A Simple One-Dimensional Approach to Modelling Ceramic Composite Armour Defeat R.L. Woodward
  7. Materials Forum v.13 Energy Absorption in the Failure of Ceramic Composite Armours D.L. Woodward;R.G. O'Donnell;B.J. Baxter;B. Nicol;S.D. Pattie
  8. Shock Compression of Condensed Marter Spherical Waves in Pure Alumina. Effects of Grain Size on Flow and Fracture J. Capnoux;Schmidt(ed.);J.N. Johnson(ed.);L.W. Davison(ed.)
  9. J. Mater. Sci. v.24 Effect of Stress State and Microstructural Parameters on Impact Damage of Alumma-Based Ceramics L.H.L. Louro;M.A. Meyers
  10. Int. J. Impact Eng. v.7 no.3 The Relation between Ballistic Efficiency and Compressive Strength of Ceramic Tile Z. Rozenberg;Y. Yeshurun
  11. Lectures on Dynamic Behavior of Materials M.A. Meyers;G.Ravichandran