分割式ホプキンソン棒法における衝撃圧縮試験片に作用する慣性力および摩擦の影響：数値シミュレーションによる検討

摘要

The split Hopkinson pressure bar technique has widely been used for impact testing of materials in the strain rate range from 102 to 104 s~'. However, some problems still remain in obtaining precise stress-strain curves of a sample. In these problems, a radial inertia and a friction during the impact test affect a determination of a size in the sample. In this paper, the theory on the basis of the energy conservation for this technique proposed in the past is examined and some modifications derived from the radial momentum conservation are applied. Then, it is shown that the inertia and friction effects are coupled to each other. A computational simulation by using the commercial FEM code ABA-QUS/Explicit ver. 6.8 is conducted to check a validity of these modifications. Simulations are performed by changing a friction coefficient and a ratio between the diameter and height of the specimen.%分割式ホプキンソン棒法は，KoIskyにより開発さrnれ，ひずみ速度10~2～10~4s~(-1)における衝撃試験法rnとして研究結果に長年の蓄積があり，信頼性が高く，rn簡便な方法であることにより非常に数多くの研究がなrnされている．