Glass Fabric/BMI 적층판의 삼점굴곡 시험시 발생되는 손상 및 파단현상에 대해 지지간 거리와 시편두께의 비가 미치는 영향

이재락; 김준형; 신동근; 김영철; 윤동진

Polymer(Korea), Vol.15, No.3, 242-250, June, 1991

Effect of the Ratio Between Supporting Span and Thickness of the Specimen in the Case of Three Points Flexural Test on the Damage and Fracture Phenomena of Glass Fabric/BMI Laminates

이재락, 김준형, 신동근, 김영철, 윤동진

초록

한국 화이바에서 E glass 섬유로 직조한 plain weave WR 570A를 두장 겹쳐서 Boots Technochemie Co.에서 근자에 개발된 autoclave 성형용 제2세대 bismaleimide 수지인 Compimide 800으로 함침하여 autoclave로 (0°/90°)_s에 해당하는 구조를 만들어 삼점굴곡시험하에서 지지간 거리와 시편두께의 비(L/d)가 30,45,60,75,90,105,120 경우에 대한 damage의 축적 및 발달 그리고 delamination 현상 등을 음향방출시험, microscopic observation, load-deflection curve의 변화 등에 의해 규명하였다. L/d는 상기한 여러 가지 damage 현상 및 최종 파단형태에 커다란 영향을 미친다.

Glass fabric/BMI composites of structure(0。/90。)_s were cured at the autoclave, which are reinforced by the two plies of plain weave WR 570A from Hankuk Fiber Co., E glass fibers. Compimide 800 from Boots Technochemie Co., which is a second generation of bismaleimides, was chosen to impregnate the above plain weaves. Accumulation and development of damage, and delamination phenomena of the glass fabric/BMI composites at the three points flexural tests for the ratio between the supporing span and the thickness of the specimen, (L/d) 30,45,60,75,90,105,120 were examined with results of the acoustic emissions, microscopic observation and load-deflection curves. L/d has a significant influences on the above mentioned damage and fracture phenomena..

[References]

Ishikawa T, Matsushima M, Hayashi Y, "Effect of Local Coupling Upon Linear and Nonlinear Behavior of Fabric Laminates," Proceedings of Fifth Int. Conf. of Comp. Mat., San Diego (1985)
Ko FK, Pastore CM, Yang JM, Chou TW, "Structure and Properties of Multilayer Multidirectional Warp Knit Fabric Reinforced Composites," Proceedings of the 3rd Japan-U.S. Conf. on Comp. Mater. Tokyo (1986)
ASM International Handbook Committee, "Composites," Engineered Materials Hand-book Vol. 1, pp. 148-150, ASM Int. Metals Park (1987)
Traceski FT, Alexander JR, "Development of a Material Specification for Carbon Fiber/Bismaleimide (BMI) Woven Fabric Prepreges," Proceedings of 33rd Int. SAMPE Symp., Anaheim (1988)
(주)종합기술센타, "최신 내열성 고분자," pp. 430-432, Tokyo (1987)
Strenzenberger HD, Herzog M, Konig P, Romer W, Breitigam W, "Bismaleimide Resins," Past, Present, Future, Proceedings of 3rd Int. SAMPE Symp.
Ishikawa T, Fiber Sci. Tech., 15, 127 (1981)
Ishikawa T, Chou TW, AIAA J., 21, 1714 (1983)
Ishikawa T, Chou TW, "Stiffness and Strength Properties of Woven Fabric Composites," Proceedings of 4th Int. Conf. of Comp. Mat., Tokyo (1982)
Ishikawa T, Chou TW, J. Comp. Mater., 17, 399 (1983)
Ishikawa T, Matsushima M, Hayashi Y, Chou TW, J. Comp. Mater., 18, 433 (1985)
Yang JM, Ma CL, Chou TW, "Elastic Stiffness of Biaxial and Triaxial Woven Fabric Composites," Proceedings of the 29th SAMPE Symp., San Diego (1984)
Yang JM, Chou TW, "Performance Maps of Textile Structural Composites," Proceedings of 6th Int. Conf. of Comp. Mat. London (1987)
Yoshino T, "Effect of Surface Slit Angle and Distance Between Two Indentations on Bending Fatigue Strength of Plain-Woven Glass Fabric FRP," Proceedings of 4th Japan-U.S. Conf. on Comp. Mater., Washington (1988)
Ishikawa T, Matsushima M, Hayashi Y, "Effect of Local Coupling Upon Linear and Nonlinear Behavior of Fabric Composites," Proceedings of 5th Int. Conf. on Comp. Mater., San Diego (1985)
Falchi A, Gracia J, "Effects of Three Point Bending Test Controlled by Acoustic Emission on Carbon/Epoxy Laminates," Proceeding of 6th Int. Conf. on Comp. Mater., London (1987)
Shi GC, Skudra AM, "Failure Mechanics of Composites," Vol. 2 of Handbook of Composites edited by A. Kelly and Y.N. Rabotnov, Elsevier Science Publishers, Amsterdam (1985)
Zweben C, Smith WS, Wardle MW, "Test Methods for Fiber Tensile Strength, Composite Flexural Modulus, and Properties of Fabric-Reinforced Liminates," ASTM STP 674, ASTM (1979)
Lubin G, "Handbook of Composites," pp. 89-114, 136-159, 196-271, Van Nostrand Reinhold Co., Amsterdam (1982)
Suzuki M, Nakanishi H, Iwamoto M, Jinen E, Maekawa Z, Mori A, Sun F, "A Study on Fracture Mechanisms of CFRP by Acoustic Emission Method," Proceedings of 6th Int. Conf. on Comp. Mater. London (1987)
Lee JR, Kim JH, Lee JJ, Kim KC, Yoon DJ, Polym.(Korea), 14(2), 104 (1990)
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[1] Ishikawa T, Matsushima M, Hayashi Y, "Effect of Local Coupling Upon Linear and Nonlinear Behavior of Fabric Laminates," Proceedings of Fifth Int. Conf. of Comp. Mat., San Diego (1985)

[2] Ko FK, Pastore CM, Yang JM, Chou TW, "Structure and Properties of Multilayer Multidirectional Warp Knit Fabric Reinforced Composites," Proceedings of the 3rd Japan-U.S. Conf. on Comp. Mater. Tokyo (1986)

[3] ASM International Handbook Committee, "Composites," Engineered Materials Hand-book Vol. 1, pp. 148-150, ASM Int. Metals Park (1987)

[4] Traceski FT, Alexander JR, "Development of a Material Specification for Carbon Fiber/Bismaleimide (BMI) Woven Fabric Prepreges," Proceedings of 33rd Int. SAMPE Symp., Anaheim (1988)

[5] (주)종합기술센타, "최신 내열성 고분자," pp. 430-432, Tokyo (1987)

[6] Strenzenberger HD, Herzog M, Konig P, Romer W, Breitigam W, "Bismaleimide Resins," Past, Present, Future, Proceedings of 3rd Int. SAMPE Symp.

[7] Ishikawa T, Fiber Sci. Tech., 15, 127 (1981)

[8] Ishikawa T, Chou TW, AIAA J., 21, 1714 (1983)

[9] Ishikawa T, Chou TW, "Stiffness and Strength Properties of Woven Fabric Composites," Proceedings of 4th Int. Conf. of Comp. Mat., Tokyo (1982)

[10] Ishikawa T, Chou TW, J. Comp. Mater., 17, 399 (1983)

[11] Ishikawa T, Matsushima M, Hayashi Y, Chou TW, J. Comp. Mater., 18, 433 (1985)

[12] Yang JM, Ma CL, Chou TW, "Elastic Stiffness of Biaxial and Triaxial Woven Fabric Composites," Proceedings of the 29th SAMPE Symp., San Diego (1984)

[13] Yang JM, Chou TW, "Performance Maps of Textile Structural Composites," Proceedings of 6th Int. Conf. of Comp. Mat. London (1987)

[14] Yoshino T, "Effect of Surface Slit Angle and Distance Between Two Indentations on Bending Fatigue Strength of Plain-Woven Glass Fabric FRP," Proceedings of 4th Japan-U.S. Conf. on Comp. Mater., Washington (1988)

[15] Ishikawa T, Matsushima M, Hayashi Y, "Effect of Local Coupling Upon Linear and Nonlinear Behavior of Fabric Composites," Proceedings of 5th Int. Conf. on Comp. Mater., San Diego (1985)

[16] Falchi A, Gracia J, "Effects of Three Point Bending Test Controlled by Acoustic Emission on Carbon/Epoxy Laminates," Proceeding of 6th Int. Conf. on Comp. Mater., London (1987)

[17] Shi GC, Skudra AM, "Failure Mechanics of Composites," Vol. 2 of Handbook of Composites edited by A. Kelly and Y.N. Rabotnov, Elsevier Science Publishers, Amsterdam (1985)

[18] Zweben C, Smith WS, Wardle MW, "Test Methods for Fiber Tensile Strength, Composite Flexural Modulus, and Properties of Fabric-Reinforced Liminates," ASTM STP 674, ASTM (1979)

[19] Lubin G, "Handbook of Composites," pp. 89-114, 136-159, 196-271, Van Nostrand Reinhold Co., Amsterdam (1982)

[20] Suzuki M, Nakanishi H, Iwamoto M, Jinen E, Maekawa Z, Mori A, Sun F, "A Study on Fracture Mechanisms of CFRP by Acoustic Emission Method," Proceedings of 6th Int. Conf. on Comp. Mater. London (1987)

[21] Lee JR, Kim JH, Lee JJ, Kim KC, Yoon DJ, Polym.(Korea), 14(2), 104 (1990)

[22] Lee JR, Kim JH, Lee JJ, Kim KC, Yoon DJ, "Effect of the Geometric Factor on the Damage and Failure of the Various Uni-Directional Carbon/Epoxy Laminates," will be Published in Composites (Korea)