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ABSTRACT 14

제1장 서론 17

제1절 연구배경 17

제2절 연구목적 및 방법 22

제2장 CFRP부재의 에너지 흡수이론 25

제1절 복합 박육부재의 압궤모드 25

제2절 복합 박육부재의 압궤이론 34

제3장 실험방법 41

제1절 시험편 41

제2절 충격 실험장치 46

제3절 충격 압궤실험 50

제4장 에너지 변화에 따른 충격압궤 실험결과 52

제1절 원형단면 CFRP부재의 충격실험결과 52

제2절 사각단면 CFRP부재의 충격실험결과 61

제5장 결과 및 고찰 70

제1절 원형 CFRP 부재의 충격압궤특성 70

제2절 사각형 CFRP 부재의 충격압궤특성 85

제3절 충격 압궤모드 99

제6장 결론 104

참고문헌 107

List of Tables

Table 1. Material properties of the CFRP prepreg sheet 41

Table 2. Impact collapse test result for circular members with outer... 59

Table 3. Impact collapse test result for circular members outer... 60

Table 4. Impact collapse test result for square members with outer... 68

Table 5. Impact collapse test result for square members with outer... 69

Table 6. Collapse length for circular members according to... 72

Table 7. Maximum collapse load for circular members... 75

Table 8. Absorbed energy for circular members according to... 78

Table 9. Total absorbed energy for circular members according to... 81

Table 10. Impact characteristics for CFRP circular members according to... 82

Table 11. Impact characteristics for CFRP circular members according to... 83

Table 12. Impact characteristics for CFRP circular members according to... 84

Table 13. Collapse length for Square members according to... 87

Table 14. Maximum collapse load for Square members... 90

Table 15. Absorbed energy for Square members according to... 93

Table 16. Total absorbed energy for Square members according... 96

Table 17. Impact characteristics for CFRP square members according to... 97

Table 18. Impact characteristics for CFRP square members according to... 98

Table 19. Impact characteristics for CFRP square members according to... 98

List of Figures

Fig. 1. The key factors of CFRP laminates 20

Fig. 2. Composite structures for boeing 787 21

Fig. 3. Crushing process of continuous fiber-reinforced composite tubes 27

Fig. 4. Crushing characteristics of transverse shearing crushing mode 28

Fig. 5. Sketch of crack propagation modes 28

Fig. 6. Crushing characteristics of lamina bending crushing mode 30

Fig. 7. Friction related energy-absorption mechanisms 30

Fig. 8. Crushing characteristics of brittle fracturing crushing mode 32

Fig. 9. Crushing characteristics of local buckling crushing mode 33

Fig. 10. Collapse pattern of the composite tube under axial-compress... 37

Fig. 11. Configuration of Specimens 43

Fig. 12. Autoclave vacuum bag degassing 44

Fig. 13. Processing of vacuum bag degassing 45

Fig. 14. Curing cycle of CFRP slacking specimen 45

Fig. 15. Impact testing setup for crushing 48

Fig. 16. Diagram of measurement system 49

Fig. 17. Load-displacement curve of CFRP Circular members... 53

Fig. 18. Load-displacement curve of CFRP Circular members... 54

Fig. 19. Load-displacement curve of CFRP Circular members... 55

Fig. 20. Load-displacement curve of CFRP Circular members... 56

Fig. 21. Load-displacement curve of CFRP Circular members... 57

Fig. 22. Load-displacement curve of CFRP Circular members... 58

Fig. 23. Load-displacement curve of CFRP Square members... 62

Fig. 24. Load-displacement curve of CFRP Square members... 63

Fig. 25. Load-displacement curve of CFRP Square members... 64

Fig. 26. Load-displacement curve of CFRP Square members... 65

Fig. 27. Load-displacement curve of CFRP Square members... 66

Fig. 28. Load-displacement curve of CFRP Square members... 67

Fig. 29. Relationship between interface number and collapse length for... 71

Fig. 30. Relationship between interface number and collapse length for... 71

Fig. 31. Relationship between interface number and max collapse load for... 74

Fig. 32. Relationship between interface number and max collapse load for... 74

Fig. 33. Relationship between interface number and absorbed energy for... 77

Fig. 34. Relationship between interface number and absorbed energy for... 77

Fig. 35. Relationship between interface number and total absorbed energy... 80

Fig. 36. Relationship between interface number and total absorbed energy... 80

Fig. 37. Relationship between interface number and collapse length for... 86

Fig. 38. Relationship between interface number and collapse length for... 86

Fig. 39. Relationship between interface number and max collapse load for... 89

Fig. 40. Relationship between interface number and max collapse load for... 89

Fig. 41. Relationship between interface number and absorbed energy for... 92

Fig. 42. Relationship between interface number and absorbed energy for... 92

Fig. 43. Relationship between interface number and total absorbed energy... 95

Fig. 44. Relationship between interface number and total absorbed energy... 95

List of Photographs

Photo. 1. The crush zone of Carbon/Epoxy tube with half circle... 34

Photo. 2. Autoclave 44

Photo. 3. Shape of Collapse CFRP Circular member with... 99

Photo. 4. Shape of Collapse CFRP Circular member with 100

Photo. 5. Shape of Collapse CFRP Square member with orientation angle 0˚... 101

Photo. 6. Shape of Collapse CFRP Square member with orientation angle 90˚... 101

초록보기

 In the present study, the impact properties of a CFRP structural member under an impact load were intentively investigated for passenger safety protection under assuming the commercial use of carbon fibers reinforced plastic (CFRP) structural members in lightweight cars; in addition, the superiority of the impact properties depending on its layer configuration was experimentally investigated. Especially, the impact properties and collapse modes depending on the cross-sectional shape of the CFRP material, the outermost layer angle, and interlaminar number were studied to obtain the optimum data for lightweight vehicular body design with improved fuel efficiency and passenger safety performance. The obtained results from this research are the following:

1. With an impact energy of 611.52 J, the smallest collapse length of CFRP material with a circular cross-section was 54.7 mm when the outermost layer angle was at 0° however, at 90°, the smallest collapse length was 34 mm, which is approximately 60% shorter. Hence, in order to secure the internal space for guaranteed passenger safety after a collision, the outermost layer angle of the CFRP material with a circular cross-section is 90°, and the impact property seems to be the most outstanding when the interlaminar number is 6.

2. For an impact energy of 372.4 J, for CFRPs with a rectangular cross-section, the smallest collapse length of 64.0 mm occurred with an outermost layer angle of 0° however, the length decreases to 59.5 mm at an angle of 90°, which is about 8% shorter. Therefore, in order to secure the internal space for guaranteed passenger safety after a collision, the outermost layer angle of CFRP material with a rectangular cross-section is 90°, and the impact property seems to be the most outstanding when the interlaminar number is 2.

3. When the outermost layer angle was 0°, the CFRP member with a circular cross-section collapsed due to the gradual propagation of interlaminar and intralaminar cracks, followed by the outwardly expanding Spline phenomenon in the member. Moreover, the laminar flexure caused by the propagation of interlaminar and intralaminar cracks, the movement accompanied with the collapsed surface, and the packaged-laminar friction at the load surface mainly absorbed the energy, and it was collapsed in a brittle fracture mode of combined transverse shear and fiber flexural modes along the fiber direction. However, in the case of the outermost layer angle of 90°, longitudinal fibers at 0° tried to expand outward in the member at impact collapse, but the members, along with the fibers at 90°, broke and collapsed in a ductile fracture mode.

4. For the CFRP members with a rectangular cross-section, when the outermost layer angle is at 0°, the laminar flexure due to the propagation of interlaminar and intralaminar cracks in the plate member, the packaged-laminar and matrix rupture due to the transverse shear mode in the corner member, the flexure of packaged-laminar, and the rupture of fibers absorbed most of the energy. Moreover, the plate members expanded outward with progressive propagation of interlaminar and intralaminar cracks when the outermost layer angle is at 90°but the corner member collapsed into a combined form of the packaged laminar fiber and matrix rupture and the laminar flexure due to transverse shear mode.

참고문헌 (58건) : 자료제공( 네이버학술정보 )

참고문헌 목록에 대한 테이블로 번호, 참고문헌, 국회도서관 소장유무로 구성되어 있습니다.
번호 참고문헌 국회도서관 소장유무
1 한국자동차공학회지 , 『자동차 기술 핸드북 ; 시험평가편』SAE Korea, 1996, pp. 339-350. 미소장
2 Design and Manufacturing of composite Automotive Parts 소장
3 "Test Methods For Composite Materials: Seminar Notes." Technomic Publishing Company, 1990. 미소장
4 "자동차 경량화의 현황과 전망." 『자동차경제 』, 24-29, 1997. 미소장
5 한국자동차 신기술의 동향,6 소장
6 (A)Study on Absorption Energy Characteristic of Hybrid Member for Lightweight Material Application of Vehicle Structural Part 소장
7 차체 경량화를 위한 CFRP 복합구조부재의 충격압궤모드에 관한 연구 소장
8 “CFRP 이중모자형 복합구조부재의 축 압궤 특성에 관한 연구”『한국생산제조시스템학회 학술발표대회 논문집』2012. 미소장
9 경량화용 Al/CFRP 사각 구조부재의 압궤 특성에 관한 연구 소장
10 적층조건에 따른 혼성 원형 박육부재의 충격압궤거동 소장
11 한국자동차공학회 오토저널 및 영문 논문집(IJAT) 목차 외 네이버 미소장
12 한국자동차공학회 오토저널 및 영문 논문집(IJAT) 목차 외 네이버 미소장
13 Lightweight Design for Automotive Door Using Optimizations and Design of Experiments 소장
14 Axial Crush and Energy Absorption Characteristics of Aluminum/GFRP Hybrid Square Tubes 소장
15 "Crashworthy Behavior of Thin-Walled Tubes of Fibreglass Composite Materials Subjected to Axial Loading." J. Composite Materials 24:72-91, 1990. 미소장
16 Crushing Characteristics of 3-D Braided Composite Square Tubes 네이버 미소장
17 Study on Impact Characteristics of CFRP Structural Member According to Stacking Conditions 네이버 미소장
18 Development of Pre-Tensioning Device for CFRP Strips and Applicability to Repair of Cracked Steel Members 네이버 미소장
19 “승용차용 CFRP 구조 적용에 대한 내구신뢰성 평가예측기술.”『대한기계학회 춘추학술대회』 2016:408-219, 2016. 미소장
20 Effects of Braiding Parameters on Energy Absorption Capability of Triaxially Braided Composite Tubes 네이버 미소장
21 Energy Absorption Characteristics of Hybrid Braided Composite Tubes 네이버 미소장
22 The Behavior of Shells Composed of Isotropic and Composite Materials: Kluwer Academic Publishers, ISBN 0-7923-2113-8, 1993. 미소장
23 Behavior Analysis of Laminated Composite Cylindrical Shells with Carbon Fiber 네이버 미소장
24 An Energy Absorption Characteristic of Thin-Walled Structure Members by Crushing Load 소장
25 Development of CFRP Structure Members with Optimum Absorption Energy Characteristics by Crushing Load 소장
26 Composite Applications to Automobiles 소장
27 박육단면 차체구조부재의 충격압궤 특성평가 소장
28 충격 흡수용 경량화 차체구조부재의 안전성능 평가 소장
29 경량화용 Al/CFRP 혼성부재의 충격압궤특성 소장
30 Experimental quasi-static axial crushing of top-hat and double-hat thin-walled sections 네이버 미소장
31 "Mean Crushing strength of closed-hat section members." Society of Automotive Engineers paper No. 740040, 1974. 미소장
32 "Energy absorption characteristics of vehicls body structure." Japan Society of Automotive Engineers Bulletin 7:65-74, 1976. 미소장
33 "Energy absorption by the plastic deformatin of body structural members." Paper 783068 presented at S.A.E. Annual Meeting, Detroit, February 1978. 2002. 미소장
34 "Collapse analysis of spot welded thin section members in a vehicle body structure at various impact velocities." KSME International Journal 17:501-510, 2003. 미소장
35 Theoretical analysis for axial crushing behaviour of aluminium foam-filled hat sections 네이버 미소장
36 Partition energy absorption of axially crushed aluminum foam-filled hat sections 네이버 미소장
37 Crashworthiness assessment of front side members in an auto-body considering the fabrication histories 네이버 미소장
38 "성형 효과를 고려한 차체 구조 부재의 충돌특성."『한국정밀공학회논문집』12:91-98, 2004. 미소장
39 "Energy-Absorption Capability of Composite Tubes and Beams." NASA TM 101634, 1989. 미소장
40 The Effects of Crushing Speed on the Energy-Absorption Capability of Composite Tubes 네이버 미소장
41 Analogy for the effect of material and geometrical variables on energy-absorption capability of composite tubes 네이버 미소장
42 “충격하중을 받는 CFRP 적층판의 충격손상과 굽힘 잔류강도.”『대한기계학회집』pp.2752-2761, 1991. 미소장
43 Experimental Study on Low-Velocity Impact Test and Response of Composite Laminates 소장
44 Damage Initation During Low-Velocity Impact on Composite Laminates, Ph.D. Thesis Dept. of Mechanical Engineering: U. of Dayton, Ohio, May 1994. 미소장
45 "compressive behaviour of large undamaged and damaged thick laminated panels." Composite Structures pp. Issues 1-4, 589-597, 1997. 미소장
46 "Relationship Between the Elastic Bucking of Square Tubes and Rectangular Plates." International Journal of Applied Mechanics 57:969-973, 1990. 미소장
47 Experimental evaluation of the strain field history during plastic progressive folding of aluminium circular tubes 네이버 미소장
48 Collapse Characteristics of CFRP Hat Shaped members According to Variation of Interface Numbers under the Hygrothermal Environment 소장
49 적층각 및 형상 변화에 따른 CFRP 구조부재의 동적 특성 소장
50 “적층구성과 충돌에너지의 변화에 따른 CFRP 구조부재의 충격특성.”『한국생산제조시스템학회』 22:6:976~981, 2013. 미소장
51 Axial collapse characteristics of CFRP composite thin-wall structures for light weight of vehicles 네이버 미소장
52 Crushing characteristics of continuous fibre-reinforced composite tubes 네이버 미소장
53 Crushing characteristics of continuous fibre-reinforced composite tubes 네이버 미소장
54 Crushing Characteristics of Composite Tubes with "Near-Elliptical" Cross Sections 네이버 미소장
55 "Prediction of Energy-Absorption Capability Composite Tubes ."Journal of Composite Materials 26:388-404,1991. 미소장
56 "Energy-Absorption Characteristics of Composite Tubes with Different Coss-Sectional Shapes. "Proceeding of the 10th Annual ASM/ESD Advanced Composites Conference:523-534, 1994. 미소장
57 "Consideration of Internal Folding and Non-symmetry in Axi-symmetric Axial Compression of Round Tubes."Int. J. of Solid and Structures, 1996. 미소장
58 An Analysis of Axial Crushing of Composite Tubes 네이버 미소장

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