کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8038935 | 1518421 | 2016 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigations on deformation and fracture behavior of workpiece material during high speed machining of 7050-T7451 aluminum alloy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی صنعتی و تولید
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Investigations on deformation and fracture behavior of workpiece material during high speed machining of 7050-T7451 aluminum alloy Investigations on deformation and fracture behavior of workpiece material during high speed machining of 7050-T7451 aluminum alloy](/preview/png/8038935.png)
چکیده انگلیسی
Research on material deformation and fracture behavior under large strain rate has great practical significance. The dynamic property of 7050-T7451 aluminum alloy under the strain rate ranging from 1.2Â ÃÂ 105Â sâ1 to 2.0Â ÃÂ 106Â sâ1 is investigated with high speed orthogonal cutting experiments. The microstructures on fracture surface of serrated and fragmented chips are observed and analyzed. The results indicate that the workpiece material in the primary deformation zone undergoes severe plastic deformation causing the formation of ductile fracture and dimples within the cutting speed ranging from 1000Â m/min to 5000Â m/min (i.e. the strain rate is between 1.2Â ÃÂ 105Â sâ1 and 1.4Â ÃÂ 106Â sâ1), during which the serrated chips are produced. The fragmented chips are generated due to brittle fracture during the cutting speed ranging from 5000Â m/min to 7000Â m/min (i.e. the strain rate ranges from 1.4Â ÃÂ 106Â sâ1 to 2Â ÃÂ 106Â sâ1). The Energy Dispersive X-ray Analysis (EDAX) results at different positions in chips show that the content of oxygen element into chip has positive relationship with the cutting temperature raised due to material deformation. Brittle tearing and fragments adhesion can be seen on the finished surface produced under ultra high cutting speed because the fragmented chips are formatted in the mode of brittle fracture. The research shows that material deformation and fracture behavior changes greatly under ultra large strain rate, which then affects the material removal mechanism and finished surface quality during machining process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: CIRP Journal of Manufacturing Science and Technology - Volume 14, August 2016, Pages 43-54
Journal: CIRP Journal of Manufacturing Science and Technology - Volume 14, August 2016, Pages 43-54
نویسندگان
Bing Wang, Zhanqiang Liu,