고 변형률 속도하에서의 폴리카아보네이트의 동적 물성 결정을 위한 봉 충격 시험법에 있어서 종횡비의 효과

민옥기; 남창훈; 이정민

Polymer(Korea), Vol.16, No.4, 375-382, July, 1992

Effect of Aspect-Ratio in Rod Impact Test for the Determination of Dynamic Material Properties of Polycarbonate at High-Strain-Rate

민옥기, 남창훈, 이정민

초록

고 변형률 속도하에서 폴리카아보네이트의 동적 물성 결정을 위한 봉 충격 시험법에 있어서 종횡비의 효과에 대하여 연구하였다. 동적 물성의 계산을 위한 기초 데이타는 종횡비 범위 2∼5인 끝면이 평면인 원통형 시험편을 공압 장치에 의하여 속도 범위 150∼250m/sec로 충돌시켜 얻었다. 동적 특성은 탄소성 파동 전파 이론에 의하여 계산하였다. 폴리카아보네이트의 동적 특성은 종횡비에 의존하며 그 효과는 종횡비가 증가함에 따라 감소한다. 일차원 개념을 이용한 이론을 타당하게 적용하려면 상대적으로 고 종횡비를 갖는 시험편을 사용하여 실험하여야 한다. 한편 봉 충격 시험에 의하여 도출된 폴리카아보네이트의 동적 항복 응력은 변형률 속도 범위 10³∼10⁵sec^-1에서 급격한 증가를 나타낸다.

Effect of aspect-ratio in rod impact test for the determination of dynamic material properties of polycarbonate at high-strain-rate has been investigated. Data for the calculation of dynamic material properties have been obtained with flat-ended cylindrical rod specimens having aspect-ratios from 2 to 5, in the range of impact velocity from 150 to 250 m/sec by a compressed-air system. The calculation has been performed by theories based on one-dimensional elastic-plastic wave propagation phenomena. The dynamic material properties of polycarbonate are dependent on the aspect-ratio and the effect diminishes with the increase of aspect-ratio. For the valid application of theories which use the concept of one-dimensionality, rod impact test should be performed by using the rod specimen haying relatively high aspect-ratio. The dynamic yield stress determined by rod impact test shows the abrupt increase in the range of strain-rate 10³∼10⁵sec^-1.

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[1] Harding J, "Testing Techniques at High Rates of Strain," OUEL-1308180, University of Oxford (1980)

[2] Staker MR, "High Strain Rate Testing," in Matals Handbook, Ninth Edition, Vol. 8, American Society for Metals (1985)

[3] Zukas JA, "Impact Dynamics," John Wiley & Sons (1982)

[4] Zukas JA, "High Velocity Impact Dynamics," John Wiley & Sons (1990)

[5] Taylor GI, Proc. R. Soc., A194, 289 (1948)

[6] Hawkyard JB, Int. J. Mech. Sci., 11, 313 (1969)

[7] Gillis PP, J. Appl. Phys., 61, 499 (1987)

[8] Gillis PP, Mech. Mater., 6, 293 (1987)

[9] Gillis PP, Jones SE, J. Eng. Mater. Tech., 111, 327 (1989)

[10] Hutchings IM, J. Mech. Phys. Solids, 26, 289 (1979)

[11] Date H, J. Soc. Mater. Sci., 33, 1482 (1984)

[12] Wilkins ML, Guinan MW, J. Appl. Phys., 44, 1200 (1973)

[13] Johnson GR, Holmquist TJ, J. Appl. Phys., 64, 3901 (1988)

[14] Zerilli FJ, Armstrong RW, J. Appl. Phys., 61, 1816 (1987)

[15] Papirno RP, Proc. Army Sym. on Solid Mechanics, AMMRC MS 80-4, p. 367 (1980)

[16] House JW, "Taylor Impact Testing," AFATL-TR-89-41 (1989)

[17] Chanda M, Roy SK, "Plastics Technology Handbook," p. 526, Marcel Dekker (1987)

[18] Kukureka SN, Hutchings IM, Proc. 7th Int. Conf. on High Energy Rate Febrication, University of Leeds, p. 29 (1981)

[19] Briscoe BJ, Hutchings IM, Polymer, 17, 1099 (1976)

[20] Kukureka SN, Hutchings IM, Int. J. Mech. Sci., 26, 617 (1984)

[21] Hayashi T, Yamamura H, Trans. JSME, A46, 1096 (1980)