Nghiên cứu so sánh độ số mũ mặt phẳng bền của hàm bền Barlat trong dự đoán đường giới hạn tạo hình của hợp kim zirconium bằng phương pháp M-K

International Journal of Material Forming - Tập 14 - Trang 467-484 - 2021
Congyi Lei1,2, Jianzhong Mao1,2, Xiaomin Zhang1,2, Jingxuan Liu1,2, Lian Wang3, Ding Chen1,2
1State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Changsha, People’s Republic of China
2College of Mechanical and Vehicle Engineer, Hunan University, Changsha, People’s Republic of China
3State Nuclear Bao-Ti Zirconium Industry Company, Baoji, China

Tóm tắt

Đường giới hạn tạo hình (FLC) của hợp kim zirconium đóng vai trò quan trọng trong việc sản xuất lưới spacer dùng cho cụm nhiên liệu hạt nhân. Dự đoán lý thuyết về FLC đã cung cấp một phương pháp tiện lợi để tính toán giới hạn biến dạng trong quá trình tạo hình tấm, nhưng độ chính xác của dự đoán hợp kim zirconium vẫn chưa đạt yêu cầu do cấu trúc tinh thể xếp chồng theo phương pháp lục giác chặt chẽ (HCP). Trong bài báo này, để tìm ra giá trị độ số mũ mặt phẳng bền phù hợp cho hợp kim zirconium nhằm cải thiện độ chính xác dự đoán, FLC lý thuyết của hợp kim zirconium SZA6 đã được tính toán bằng các mã số học tự lập với các giá trị độ số mũ khác nhau và kết quả được so sánh với các thí nghiệm thực tế. Để giải thích cơ chế mà độ số mũ mặt phẳng bền ảnh hưởng đến hành vi dẻo của hợp kim zirconium SZA6, các phân phối biến dạng và đường biến dạng của các mẫu thử Nakajima đã được phân tích bằng phương pháp phần tử hữu hạn. Cuối cùng, một giá trị đề xuất của độ số mũ mặt phẳng bền phù hợp cho dự đoán FLC của hợp kim zirconium này đã được đưa ra.

Từ khóa

#đường giới hạn tạo hình #hợp kim zirconium #hàm bền Barlat #số mũ mặt phẳng bền #phương pháp M-K

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