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系統識別號 U0026-0102201713083400
論文名稱(中文) 複材修補之最佳設計
論文名稱(英文) Optimal design of composite patch repair
校院名稱 成功大學
系所名稱(中) 航空太空工程學系
系所名稱(英) Department of Aeronautics & Astronautics
學年度 105
學期 1
出版年 106
研究生(中文) 柯艾莎
研究生(英文) Elsa Copet
學號 P46057064
學位類別 碩士
語文別 英文
論文頁數 48頁
口試委員 指導教授-胡潛濱
口試委員-夏育群
口試委員-楊文彬
中文關鍵字 none 
英文關鍵字 stress intensity factor  composite repair  optimization 
學科別分類
中文摘要 none
英文摘要 This master thesis report relates the process leading toward the volume optimization of a composite patch repairing a through thickness crack in a metallic plate using the Finite Element software ANSYS. First, two-dimension and three-dimension models are build using ANSYS. Then, validation of the numerical model are done by calculation of the stress intensity factor K of the crack tip, both through the analytical solution and the Anisotropic Elastic Plate – Hwu’s software. The value of the stress intensity factor and the y component of the stress ahead of the crack tip are linked: when the stress decreases, so does the stress intensity factor. Thus, in order to save computational time, the optimization of the repair is conducted such as decreasing the y component of the stress ahead of the crack tip. Different approaches of optimization process are tested. One procedure involves the length, width, thickness and fiber orientation of the composite patch. Another sets the number of layers of composite and leaves the other input value as variables that will change throughout the optimization process. At the end, the final K obtained on the optimal configuration is computed and compared with the initial one to prove the efficiency of the repair.
論文目次 ABSTRACT I
ACKNOWLEDGEMENTS II
TABLE OF CONTENTS III
LIST OF TABLES V
LIST OF FIGURES VI
CHAPTER ONE INTRODUCTION 1
1.1 Definition of the problem 1
1.2 Purpose of the research 1
1.3 Literature review 2
1.4 Fracture mechanics. 3
CHAPTER TWO METHODOLOGY 5
2.1 Model 5
2.1.1 Finite Element Software ANSYS 5
2.1.2 Two-dimension model 5
2.2 Fracture parameter 6
2.2.1 Computer program for anisotropic elasticity – AEPH 7
2.2.2 H-integral 7
2.3 Design optimization 10
2.3.1 Optimization theory 10
2.3.2 Optimization through ANSYS 12
2.3.3 Fracture mechanics theory for optimization 13
CHAPTER THREE PROCESS 14
3.1 Model 14
3.1.1 Two-dimension model 14
3.1.2 Three-dimension model for AEPH processing 17
3.1.3 Three-dimension model for repair analysis 17
3.2 Computation of K through AEPH 19
3.2.1 Evaluation of the line integral 19
3.2.2 Evaluation of the surface integral 21
3.2.3 Input files 23
3.3 Optimization 23
3.3.1 Approach I 27
3.3.2 Approach II 28
CHAPTER FOUR RESULTS 29
4.1 Model 29
4.2 Results from AEPH 31
4.2.1 Validation of the two-dimension model 31
4.2.2 Computation of K for the three-dimension model 31
4.3 Optimization 33
4.3.1 Approach I 33
4.3.2 Approach II 40
4.4 Final K 45
CHAPTER FIVE CONCLUSION AND SUGGESTIONS 46
5.1 Conclusion 46
5.2 Suggestions 47
REFERENCES 48
參考文獻 [1] H. Errouane, Z. Sereir, and A.Chateauneuf, “Numerical model for optimal design of composite patch repair of cracked aluminum plates under tension”, International Journal of Adhesion and Adhesives - March 2014, Volume 49, pp. 64–72.
[2] H. Fekirini, B. Bachir Bouiadjra, M. Belhouari, B. Boutabout, B.Serier, “Numerical analysis of the performances of bonded composite repair with two adhesive bands in aircraft structures”, Composite structures, Vol. 82, pp. 84-89.
[3] M. Ramji, R. Srilakshmi, M. Bhanu Prakash, “Towards optimization of patch shape on the performance of bonded composite repair using FEM” Compos: Part B 2013; 45: 710–720.
[4] C. T. Sun, J. Klug, and C. Arendt “Analysis of cracked aluminum plates repaired with bonded composite patches” AIAA Journal, Vol. 34, No. 2 (1996), pp. 369-374.
[5] ANSYS Documentation, Mechanical APDL, Fracture Analysis Guide, 2. Evaluation of Fracture Mechanics Parameters, 2.3. Stress-Intensity Factor Calculation
[6] C. Hwu and H. Huang, 2012, “Investigation of the Stress Intensity Factors for Interface Corners,” Engineering Fracture Mechanics, Vol. 93, pp. 204-224.
[7] Jasbir S. Arora, “Introduction to Optimum Design”, Second Edition, 2. Optimum Design Problem Formulation
[8] Advanced Analysis Techniques Guide, Release 5.5, Chapter 1: Design Optimization
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