CÁC MÔ HÌNH TOÁN HỌC CỦA HỢP KIM MAGIE GW103K Ở NHIỆT ĐỘ CAO KHI CHỊU NÉN=CONSTITUTIVE MODELS OF GW103K MAGNESIUM ALLOY UNDER HOT COMPRESSIVE DEFORMATION

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Tác giả: Quyết Thành Nguyễn

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học Công nghệ Hàng hải, 2024

Mô tả vật lý: tr.61

Bộ sưu tập: Metadata

ID: 481878

Thêm vào giỏ

Để tìm hiểu ứng xử biến dạng nóng (dưới nhiệt độ cao) của hợp kim magie GW103K (Mg-10Gd-3Y), tác giả đã tiến hành thực hiện làm các mô hình số học, với dữ liệu thu thập được từ các thí nghiệm nén đẳng nhiệt của nhiệt độ biến dạng là (623-773) K và tốc độ biến dạng (0,001-1) s-1. Ứng suất và biến dạng thu được từ các thí nghiệm này được sử dụng để thiết lập các mô hình toán học, dựa trên mô hình chỉnh sửa Johnson-Cook và mô hình chỉnh sửa Zerilli-Armstrong. Các kết quả dự đoán từ hai mô hình này sau đó được so sánh với dữ liệu thực nghiệm. Kết quả dự báo và thực nghiệm khá tương đồng với nhau. Thêm vào đó, sự chuẩn xác của các mô hình dự báo được đánh giá bởi hệ số tương quan (R) và sai số liên quan trung bình tuyệt đối (AARE). Từ các biểu đồ, tác giả nhận thấy nhiệt độ biến dạng và tốc độ biến dạng ảnh hưởng khá lớn tới dòng ứng suất của hợp kim magie GW103K. Trong bài báo này, tác giả đã thiết lập hai mô hình toán học để mô tả mối quan hệ giữa ứng suất của hợp kim magie chịu tác động của phổ rộng các nhân tố là biến dạng, tốc độ biến dạng, và nhiệt độ.To understand the hot deformation behavior of GW103K magnesium alloy (Mg-10Gd-3Y), the author conducted numerical constitutive modeling based on literature experimental data from isothermal compression tests under wide ranges of strain rates (0.001-1) s-1 and deformation temperatures (623-773) K. The true stress and strain were acquired from those tests which were used to develop constitutive models based on the modified Johnson-Cook model and modified Zerilli-Armstrong model. The predicted results from the two models were then compared with the data from the experiment. As a result, the experimental and the predicted data exhibit good agreement. Furthermore, the prediction accuracy of the developed models was assessed by calculating the average absolute relative error (AARE) and correlation coefficient (R). From figures, the author finds that the deformation temperatures and strain rates substantially affect the flow stress behavior of GW103K magnesium alloy. In this work, the author established that the two models could depict the flow stress behavior of the alloy at elevated temperatures throughout the entire ranges of strain, strain rate, and temperature.

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