Micromechanics 시험법과 Acoustic Emission을 이용한 Brittle/Ductile Dual Matrix 복합재료의 계면물성 고찰

박종만; 이상일

Polymer(Korea), Vol.21, No.4, 689-700, July, 1997

Interfacial Aspects of Fiber Reinfoorced Brittle/Ductile Dual Matrix Composites using Micromechanics Techniques and Acoustic Emission

박종만, 이상일

초록

유리섬유 강화된 취성의 불포화폴리에스터/변성된 에폭시 복합재료의 계면결합과 미세파괴 형태에 대한 연구가 micromechanics 시험법과 acoustic emission (AE)를 통하여 조사되었다. 여러 silane coupling agents를 이용하여 상대적인 계면결합력과 미세파괴 형태를 관찰하였다 Dry와 wet 두 상태에서, 취성인 기지 부분에서 cracking수가 증가할수록, 더 큰 계면결합력을 보여주었다. 계면결합력 증가는 다른 두 계면에서의 화학적, 또는 수소결합력에 기인한다고 여겨진다. Microdroplet와 fragmentation 시험법들과 model system간에 적절한 상호관련이 이루어졌으며, AE 변수와 관련하여 행해졌다 AE의 검사는 주로 세 groups의 발생을 보여주었다. 첫째는 주로 취성기지의 cracking으로부터 발생하며, 둘째와 셋째는 섬유의 파단과 debonding 등을 포함하는 복잡한 연성기지로부터 각각 발생하였다. Micromechanics 시험법과 AE를 이용한 이중 기지 시편은 계면결합력과 미세파괴 연구에 신뢰성있는 정보를 제공해 줄 수 있을 것이다.

Interfacial bonding and microfailure modes of glass fiber reinforced brittle unsaturated polyester/modified epoxy composites were investigated via micromechanics techniques and acoustic emission (AE). Various silane coupling agents were used to observe the comparative interfacial bonding. In the brittle matrix layer, the more the numbers of cracking increased, the higher the Interfacial bonding was improved under both dry and wet conditions. This might be due to the chemical and hydrogen bondings in two interphases. A reasonable correlation among microdroplet, fragmentation tests and model system was found This can be performed by associating AE parameters. AE data showed the sequential occurrence of main three groups of AE. The first group was originated mainly from brittle matrix cracking. The second and the third resulted from the fiber breakages and complex ductile matrix cracking including debonding, respectively. The micromechanical tests for dual matrix specimens provided more reliable information on the interfacial adhesion and charaterized microfailure modes when combining AE technique.

Keywords:dual matrix composites;fragmentation test;microdroplet test;interfacial shear strength;acoustic emission

[References]

Li ZF, Grubb DT, J. Mater. Sci., 29(1), 189 (1994)
Sanadi AR, Piggott MR, J. Mater. Sci., 20, 431 (1985)
Park JM, Subramanian RV, Bayoumi AE, J. Adhes. Sci. Technol., 8, 133 (1994)
Park JM, Lee JO, Park TW, Polym. Compos., 17, 375 (1996)
Park JM, Subramanian RV, J. Adhes. Sci. Technol., 5, 459 (1991)
Marshall DB, Oliver WC, Mater. Sci. Eng., A126, 95 (1990)
Lee SM, Holguin S, J. Adhes., 31, 91 (1990)
Favre JP, Jacques D, J. Mater. Sci., 25, 1373 (1990)
Jacques D, Favre JP, 6th International Conf. on Composite Materials (ICCM)-V, 471 (1987)
Park JM, Chong EM, Shin WH, Lee SI, Yoon DJ, Lee JH, Polym.(Korea), 20(5), 753 (1996)
Ma BT, Schadler LS, Laird C, Polym. Compos., 11, 211 (1990)
Verma RK, Kander RG, Hsiao BS, J. Mater. Sci. Lett., 13(6), 438 (1994)
Narisawa L, Oba H, J. Mater. Sci., 19, 1777 (1984)
Aveston J, Cooper GA, Kelly A, IPC Sci. and Technol. Press, Guildford, U.K. 15 (1971)
Yang XF, Knowles KM, J. Am. Ceram. Soc., 75, 141 (1992)

[Referenced By]

[1] Li ZF, Grubb DT, J. Mater. Sci., 29(1), 189 (1994)

[2] Sanadi AR, Piggott MR, J. Mater. Sci., 20, 431 (1985)

[3] Park JM, Subramanian RV, Bayoumi AE, J. Adhes. Sci. Technol., 8, 133 (1994)

[4] Park JM, Lee JO, Park TW, Polym. Compos., 17, 375 (1996)

[5] Park JM, Subramanian RV, J. Adhes. Sci. Technol., 5, 459 (1991)

[6] Marshall DB, Oliver WC, Mater. Sci. Eng., A126, 95 (1990)

[7] Lee SM, Holguin S, J. Adhes., 31, 91 (1990)

[8] Favre JP, Jacques D, J. Mater. Sci., 25, 1373 (1990)

[9] Jacques D, Favre JP, 6th International Conf. on Composite Materials (ICCM)-V, 471 (1987)

[10] Park JM, Chong EM, Shin WH, Lee SI, Yoon DJ, Lee JH, Polym.(Korea), 20(5), 753 (1996)

[11] Ma BT, Schadler LS, Laird C, Polym. Compos., 11, 211 (1990)

[12] Verma RK, Kander RG, Hsiao BS, J. Mater. Sci. Lett., 13(6), 438 (1994)

[13] Narisawa L, Oba H, J. Mater. Sci., 19, 1777 (1984)

[14] Aveston J, Cooper GA, Kelly A, IPC Sci. and Technol. Press, Guildford, U.K. 15 (1971)

[15] Yang XF, Knowles KM, J. Am. Ceram. Soc., 75, 141 (1992)