표제지
목차
Abstract 9
I. 서론 11
1. 연구 배경 11
2. 개념설계 연구 16
3. 연구 목적 및 범위 19
II. 실험 계획 21
1. 평판 외 인장실험 방법 21
2. 시편 제작 28
3. 실험하중 조건 및 실험장치 40
III. 실험 결과 및 고찰 43
1. 실험결과 43
2. 10 Ply 시편 실험결과 및 고찰 44
3. 16 Ply 시편 실험결과 및 고찰 48
4. 22 Ply 시편 실험결과 및 고찰 51
5. 29 Ply 시편 실험결과 및 고찰 54
6. 시험 결과 정리 58
7. 기본설계 검증 59
IV. 결론 61
참고 문헌 63
부록 66
Table. 1. Cost-effective analysis of optional concept design 17
Table. 2. The number of specimens 30
Table. 3. Staking sequence and fiber direction ratio 32
Table. 4. Physical properties of MXB 7701/7781 Fabric 34
Table. 5. Dimension of 10 Ply and 16 Ply specimens 38
Table. 6. Dimension of 22 Ply and 29 Ply specimens 39
Fig. 1. Typical installation of edge panel and wing box concept 13
Fig. 2. New installation of edge panel and wing box concept 14
Fig. 3. Cost comparisons for selected manufacturing approaches 15
Fig. 4. Design requirement and simple Z-section concept design 16
Fig. 5. Stress notation in radius detail 18
Fig. 6. Curved laminate configurations and failure modes 19
Fig. 7. Spool specimen Design ?ASTM D 7291 22
Fig. 8. Curved-beam C-shape specimen design ASTM STP 1285 [10] 23
Fig. 9. Curved-beam specimen design ASTM STP 1206 [11] 24
Fig. 10. Curved-beam in four-point bending ASTM D 6415 26
Fig. 11. Curved-Beam loading condition on test fixture 27
Fig. 12. Design of test specimen 28
Fig. 13. Flaws at mid-plane and Teflon disk extruded PTFE film Tape 29
Fig. 14. Bagging process 31
Fig. 15. Autoclave View 33
Fig. 16. Basic Curing Cycle 33
Fig. 17. Test Specimen 35
Fig. 18. Thickness measurement in radius detail 36
Fig. 19. Location and thickness of initial flaw at mid-plane 37
Fig. 20. Test load conditions 40
Fig. 21. Test equipment and setup preparation 41
Fig. 22. Test specimen and LVDT setup view 42
Fig. 23. Manual test loading by hand pump 42
Fig. 24. Hoop Tension Stress Equation 43
Fig. 25. Stress-Displacement curve of 10 Ply Laminate 45
Fig. 26. Displacement prediction by FEM (L=2.0inch, V=130 lbs) 46
Fig. 27. Failure mode of 10 Ply specimens 47
Fig. 28. Stress-Displacement curve of 16 Ply Laminate 49
Fig. 29. Failure mode of 16 Ply specimens 50
Fig. 30. Test setup ?2.0 inch offset (before test of 22 ply specimen) 51
Fig. 31. Stress-Displacement curve of 22 Ply Laminate 52
Fig. 32. Failure mode of 22 Ply specimens 53
Fig. 33. Test setup ?2.5 inch offset (loading on a 29 ply specimen) 54
Fig. 34. Stress-Displacement curve of 29 Ply Laminate 55
Fig. 35. Failure mode of 29 Ply specimens 56
Fig. 36. A sequence of interlaminar failure 57
Fig. 37. Calculated interlaminar strength per thickness 58
Fig. 38. Applied load and splice installation geometry 59