여러가지 직교 적층판의 삼점굴곡시험하에서의 손상메카니즘의 규명

이재락; 김준형; 이주진; 김기철; 윤동진

Polymer(Korea), Vol.14, No.2, 104-114, April, 1990

Export Citation

여러가지 직교 적층판의 삼점굴곡시험하에서의 손상메카니즘의 규명

Monitoring of Damage Mechanism of Various Cross-Ply Laminates in Three Points Flexural Test

이재락, 김준형, 이주진, 김기철, 윤동진

초록

상업용 탄소섬유/에폭시 프리프레그인 Toray P3052를 사용하여, (0°/90)_2s, (90°/0°)_2s, (± 45°)_2s, (0°/90°/±45°)_s, (90°/0°/ 45°)_s 구조를 가지는 직교 적층판을 autoclave에서 성형하여, 시편을 제작한 뒤 삼점굴곡시험하에서의 손상메카니즘을 하중-처짐 곡선, 음향방출 시험결과 및 시험을 마친 시편의 손상영역을 초음파 c-scan방법으로 측정한 결과로 부터 종합적으로 규명하였다. 이때의 cross-head 속도는 2mm/min이고, 지지간 거리와 시편두께의 비는 40 : 1과 16 : 1를 채택하였다. 실헐결과 상기한 직교 적층판의 삼점굴곡하에서의 주된 손상메카니즘은 매트릭스의 손상, 보강섬유의 손상 및 층간 박리현상인데, 지지간 거리와 시편두께의 비가 적층구조와 더불어 손상형태에 큰 영향을 미친다.

The laminates with the structures of (0°/90°)_2s, (90°/0°)_2s, (±45°)_2s, (0°/90°/±45°)_s, 및 (90°/0°/ 45°)_s were cured in autoclave by using commerical prepreg P3052 from Toray Co. The damage mechanism of the above laminates in three points flexural test was determined from the results of the load-deflection curves, the acoustic emission, and the ultrasonic c-san test for the measurement of the delaminated area. The cross-head speed was 2 mm/min. The ratios between the supporting span and the thickness of the specimen were 40 : 1 and 16 : 1. The results show that the main damage mechanisms in three points flexural test are the damage of the matrix, the damage of the reinforcing fiber and the delamination for the above mentioned laminates. The relation between the supporting span and the thickness of the specimen gives great influence on the damage mechanism as well as the stacking sequences of the laminates.

[References]

Margolis JM, "Advanced Thermoset Composites," p. 193, Van Nostrand Reinhold Co., New York (1986)
Henncke EG, Jones TS, ASTM STP 696, 82 (1979)
Maddux GE, Sendeckyj GP, ASTM STP 696, 26 (1979)
Baumann KJ, Kennedy WH, Herbert DL, J. Comp. Mat., 18, 507 (1984)
Sato N, Kurauchi T, Kamigaiot O, SAMPE J., 48 (1987)
Hamstad MA, "Quality Control and Nondestructive Evaluation Techniques for Composites," Avradcom TR 83-F-7 (1983)
Ohtsuka H, 일본복합재료 학회지, 10, 102 (1984)
Short D, Summerscales J, Composites, 15, 200 (1984)
Shippen NC, Adams DF, J. Rein. Plast. Comp., 4, 242 (1985)
Kim RY, Soni SR, J. Comp. Mat., 18, 70 (1984)
Awerbuch J, Block J, Printz R, "Effect of Stacking Sequence in Cross-Ply Graphite/Epoxy Laminates on Acoustic Emission Results," ICCM-IV, Tokyo 25-28, Oct. (1982)
Testard B, Ferry F, Fleischmann P, Rouais JC, Rouby D, "Analysis of Acoustic Emission Signals Produced in Carbon/Epoxy T300/5208 Laminates," Journee Nationals Sur les Composites, JNC IV, Paris, 11-13 Sept (1984)
Masloughi A, Roy C, Proulx D, "Characterization of Acoustic Emission Signals Generated in Carbon-Epoxy Composites," 2nd Int. Symp. on AE from Rein Comp., Montreal, 21-25, July (1986)
Nahas MN, Composites, 16, 148 (1985)
Clegg DW, Collyer AA, "Mechanical Properties of Reinforced Thermoplastics," p. 101, Elsevier Appl. Sci. Publ., London (1986)
Tsai SW, Hahn HT, "Introduction to Composite Materials," p. 167, 359, Technomic Publ., Westport (1980)
Tsai SW, "Composite Design-1986,", 8-1, Think Composites, Dayton (1986)
Whitney JM, "Structural Analysis of Laminated Anisotropic Plates," p. 177, Technomic Publ., Dayton (1987)
Shi G, Bezine G, J. Comp. Mat., 22, 694 (1988)
Rosensaft M, Marom G, J. Comp. Tech. Res., 7, 12 (1985)
Ishai O, Lavengood RE, ASTM STP 460, 271 (1969)
Whitney JM, Dauksys RJ, J. Comp. Mat., 4, 135 (1970)
Reissner E, Stavsky Y, J. Appl. Mech., 28, 402 (1961)
Zweben C, Smith WS, Wardle MW, ASTM STP 674, 228 (1979)
Berg CA, Tirosh J, Isradli M, ASTM STP 497,206 (1972)
Bullock RE, J. Comp. Mat., 8, 200 (1974)
Mullin JV, Knoell AC, Mat. Research and Standards, 10, 16 (1970)
Caldwell DL, Steele DL, Guth LT, J. Rein. Plast. Comp., 6, 193 (1987)
Falchi A, Gracia J, "Effects of Three-Point Bending Test Controlled by Acoustic Emission on Carbon/Epoxy Laminates," 6th Int. Conf. on Comp. Mater. London, U.K. 20-24, July (1987)
Wang ASD, Crossman FW, J. Comp. Mat., 14, 71 (1980)
Shah V, "Handbook of Plastics Testing Technology," p. 26, John Wiley & Sons, New York (1984)
Lee JR, "Study and Modelisation of Damage of the Carbon/Epoxy Laminates (± 45 °)_2s, and (0 °/90 °)_2s," Thesis of Doc. Ing. Univ. of Tech., of Compiegne (1985)

[Referenced By]

[1] Margolis JM, "Advanced Thermoset Composites," p. 193, Van Nostrand Reinhold Co., New York (1986)

[2] Henncke EG, Jones TS, ASTM STP 696, 82 (1979)

[3] Maddux GE, Sendeckyj GP, ASTM STP 696, 26 (1979)

[4] Baumann KJ, Kennedy WH, Herbert DL, J. Comp. Mat., 18, 507 (1984)

[5] Sato N, Kurauchi T, Kamigaiot O, SAMPE J., 48 (1987)

[6] Hamstad MA, "Quality Control and Nondestructive Evaluation Techniques for Composites," Avradcom TR 83-F-7 (1983)

[7] Ohtsuka H, 일본복합재료 학회지, 10, 102 (1984)

[8] Short D, Summerscales J, Composites, 15, 200 (1984)

[9] Shippen NC, Adams DF, J. Rein. Plast. Comp., 4, 242 (1985)

[10] Kim RY, Soni SR, J. Comp. Mat., 18, 70 (1984)

[11] Awerbuch J, Block J, Printz R, "Effect of Stacking Sequence in Cross-Ply Graphite/Epoxy Laminates on Acoustic Emission Results," ICCM-IV, Tokyo 25-28, Oct. (1982)

[12] Testard B, Ferry F, Fleischmann P, Rouais JC, Rouby D, "Analysis of Acoustic Emission Signals Produced in Carbon/Epoxy T300/5208 Laminates," Journee Nationals Sur les Composites, JNC IV, Paris, 11-13 Sept (1984)

[13] Masloughi A, Roy C, Proulx D, "Characterization of Acoustic Emission Signals Generated in Carbon-Epoxy Composites," 2nd Int. Symp. on AE from Rein Comp., Montreal, 21-25, July (1986)

[14] Nahas MN, Composites, 16, 148 (1985)

[15] Clegg DW, Collyer AA, "Mechanical Properties of Reinforced Thermoplastics," p. 101, Elsevier Appl. Sci. Publ., London (1986)

[16] Tsai SW, Hahn HT, "Introduction to Composite Materials," p. 167, 359, Technomic Publ., Westport (1980)

[17] Tsai SW, "Composite Design-1986,", 8-1, Think Composites, Dayton (1986)

[18] Whitney JM, "Structural Analysis of Laminated Anisotropic Plates," p. 177, Technomic Publ., Dayton (1987)

[19] Shi G, Bezine G, J. Comp. Mat., 22, 694 (1988)

[20] Rosensaft M, Marom G, J. Comp. Tech. Res., 7, 12 (1985)

[21] Ishai O, Lavengood RE, ASTM STP 460, 271 (1969)

[22] Whitney JM, Dauksys RJ, J. Comp. Mat., 4, 135 (1970)

[23] Reissner E, Stavsky Y, J. Appl. Mech., 28, 402 (1961)

[24] Zweben C, Smith WS, Wardle MW, ASTM STP 674, 228 (1979)

[25] Berg CA, Tirosh J, Isradli M, ASTM STP 497,206 (1972)

[26] Bullock RE, J. Comp. Mat., 8, 200 (1974)

[27] Mullin JV, Knoell AC, Mat. Research and Standards, 10, 16 (1970)

[28] Caldwell DL, Steele DL, Guth LT, J. Rein. Plast. Comp., 6, 193 (1987)

[29] Falchi A, Gracia J, "Effects of Three-Point Bending Test Controlled by Acoustic Emission on Carbon/Epoxy Laminates," 6th Int. Conf. on Comp. Mater. London, U.K. 20-24, July (1987)

[30] Wang ASD, Crossman FW, J. Comp. Mat., 14, 71 (1980)

[31] Shah V, "Handbook of Plastics Testing Technology," p. 26, John Wiley & Sons, New York (1984)

[32] Lee JR, "Study and Modelisation of Damage of the Carbon/Epoxy Laminates (± 45 °)_2s, and (0 °/90 °)_2s," Thesis of Doc. Ing. Univ. of Tech., of Compiegne (1985)