پایان نامه بررسی زوال ورق های غیر ایزوتروپیک TWB تحت فرآیند هیدرو فرمینگ

فهرست:

1- مقدمه. 1

2- مروری برتحقیقات گذشته. 6

2-1- خواص مکانیکی TWBها 11

2-1-1- تست کشش... 11

2-1-2- خواص کششی. 13

2-1-3- سختی. 14

2-2- شکل پذیری. 16

2-2-1- روش های تست شکل پذیری. 16

2-2-2- شکل پذیری TWB ها 23

2-2-3- جریان ماده 25

2-3- آنالیزهای زوال. 28

2-3-1- شکل های زوال. 28

2-3-2- معیارهای زوال. 29

2-4- مدل سازی المان محدود TWBها 32

2-4-1- مدل سازی ناحیه جوش.. 32

2-4-2- مدل های سختی وتسلیم ماده 35

2-4-3- مدل سازی فرآیند شکل دهی. 37

2-5- شکل دهی به کمک فشارسیال(هیدروفرمینگ) 38

3-  تئوری. 41

3-1-  تغییرشکل الاستیک- پلاستیک 41

3-1-1- تعریف مدل ماده 42

3-1-2- استحکام ماده 48

3-2-  مدل های سختی. 50

3-2-1-  مدل پلاستیک کامل. 50

3-2-2-  مدل سختی ایزوتروپیک.. 51

3-3- نسبت های تنش تسلیم وخزش.. 54

3-4- سطح تسلیم. 55

3-4-1- سطح تسلیم وان- مایسز 55

3-4-2- سطح تسلیم هیل. 55

3-4-3- تابع تسلیم ایزوتروپیک.. 56

3-4-4- تابع تسلیم غیرایزوتروپیک.. 57

3-5- قانون جریان. 59

3-6- تعریف رفتارتسلیم غیرایزوتروپیک براساس نسبت های کرنش لنکفورد 61

3-6-1- غیرایزوتروپی عرضی. 62

3-6-2- غیرایزوتروپی صفحه ای. 63

3-6-3- غیر ایزوتروپی کلی. 63

3-7- چشم اندازکلی برای مدل سازی زوال وآسیب.. 65

3-7-1- آسیب وزوال در مواد چکش خوار 66

3-7-2- سیر پیشرفت آسیب.. 67

3-7-3- معیارشروع آسیب برای شکست درفلزات.. 68

3-7-4- معیارشروع آسیب برای ناپایداری تسلیم درورق ها 70

3-8-  تماس.. 81

3-8-1- سطوح تماس.. 81

3-8-2- تعریف جفت تماس.. 84

3-8-3- تعریف تماس کلی. 85

3-8-4-  تعریف شبیه سازی تماس براساس سطح. 85

3-8-5- میرایی درتماس ها 86

4- خواص مکانیکی ومتالورژیکی. 87

4-1- مواد وجوشکاری. 87

4-2-  خواص مکانیکی فلزات پایه وناحیه جوش.. 90

4-3- رفتار غیرایزوتروپیک پلاستیک.. 97

4-3-1-  سطح تسلیم Yld2000-2d. 98

4-3-2- سطح تسلیم Hill’48. 99

4-4- نمودارحد شکل دهی. 101

4-5- شبیه سازی تست کشش کروی. 104

5- TWB های هم جنس... 110

5-1- مدل سازی خط جوش ودرنظرگیری رفتارایزوتروپی/ غیرایزوتروپی برای ورق های پایه. 113

5-2-  مکان والگوی اولین زوال. 115

5-3- پیشرفت آسیب.. 121

6- TWB های غیرهمجنس... 122

6-1- مکان والگوی اولین زوال. 124

6-2- پیشرفت آسیب.. 128

7- تست هیدروفرمینگ.. 130

7-1- مکان والگوی اولین زوال. 133

7-2- پیشرفت آسیب.. 137

7-3- مقایسه دو روش شکل دهی مکانیکی وهیدروفرمینگ.. 139

7-4- حرکت خط جوش.. 143

8- تست کشش ساده تک محوره 147

8-1- مکان والگوی اولین زوال. 152

8-2- پیشرفت آسیب.. 157

9- نتیجه گیری وپیشنهادات.. 160

9-1- جمع بندی ونتیجه گیری. 160

9-2- پیشنهادات.. 162

مراجع. 164

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