표제지
목차
제 1 장 서론 2
제 1 절 개요 2
제 2 절 연구 동향 4
제 3 절 연구의 목적 5
제 2 장 해석 이론 7
제 1절 지배 방정식 7
제 1 항 유한 체적법 7
제 2 항 유한 요소법 8
제 2 절 외연적 시간적분법 (Explicit time integration) 9
제 1 항 외연적 시간 적분법 10
제 2 항 시간증분량의 결정 12
제 3 장 유기 복합 소재의 성형 실험 14
제 1 절 U채널 성형 실험 14
제 2 절 사각컵 성형 실험 18
제 4 장 유기복합 소재 성형 해석 20
제 1 절 U채널 성형 해석 20
제 1 항 체적 성형 해석 프로그램을 이용한 해석 20
제 2 항 박판 성형 해석 프로그램을 이용한 해석 26
제 2 절 사각컵 성형 해석 28
제 3 절 유기복합소재 성형 해석 방안 30
제 4 절 프런트 엔드 캐리어 성형 해석 30
제 5 장 결론 35
참고문헌 36
Abstract 37
감사의 글 38
Table 3-1. U channel die size 14
Table 3-2. U channel forming process 15
Figure 1-1. Benefits obtained with FECPS 3
Figure 1-2. Assembly process chart 3
Figure 2-1. Spring-mass system 10
Figure 2-2. Flow chart for explicit time integration 12
Figure 3-1. U Channel die 15
Figure 3-2. KARAM-POR U channel(deep 75mm, 50mm, 25mm) 16
Figure 3-3. Appearance of deep 75mm U channel 16
Figure 3-4. Appearance of deep 50mm U channel 16
Figure 3-5. Appearance of deep 25mm U channel 16
Figure 3-6. Deep 25mm U channel (thickness 4.5mm(L), 4.0mm(R)) 17
Figure 3-7. The appearance comparison of forming product according to die gap 18
Figure 3-8. The shape of square cup die 18
Figure 3-9. The shape of formed square cup (deep 25mm) 19
Figure 4-1. U channel forming analytical method (MSC.Superforge) 20
Figure 4-2. Effective plastic strain distribution (2D analysis, element size 2mm) 21
Figure 4-3. Effective plastic strain distribution (2D analysis, element size 1mm) 22
Figure 4-4. Effective plastic strain distribution (2D analysis, element size 0.5mm) 23
Figure 4-5. Effective plastic strain distribution (3D analysis, steel, element size 1mm) 23
Figure 4-6. Partial 50% section in to warding length of effective plastic strain distribution (3D analysis, element size 1mm) 24
Figure 4-7. Effective plastic strain distribution (3D analysis, Element size in organic complex board 2mm) 25
Figure 4-8. Partial 50% section in to warding length of effective plastic strain distribution (3D analysis, Element size in organic complex board 2mm) 25
Figure 4-9. U channel analysis forming die & element (LS-DYNA Analysis) 27
Figure 4-10. Effective plastic strain distribution (U channel, LS-DYNA Analysis) 27
Figure 4-11. Effective plastic strain distribution (25mm Square cup) 29
Figure 4-12. Effective plastic strain distribution of square cup in the diagonal direction section 29
Figure 4-13. Carrier forming die model of organic complex element 31
Figure 4-14. Carrier forming analysis result of organic complex element (Effective strain distribution) 31
Figure 4-15. Organic complex element carrier forming result 32
Figure 4-16. Die model for prevention of flange creases 33
Figure 4-17. Analysis result in case of restraint for flange creases (Effective strain distribution) 33
Figure 4-18. Organic complex element carrier 34