کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7971676 1514610 2018 34 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Prediction of fracture and deep drawing behavior of solution treated Inconel-718 sheets: Numerical modeling and experimental validation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Prediction of fracture and deep drawing behavior of solution treated Inconel-718 sheets: Numerical modeling and experimental validation
چکیده انگلیسی
In the present work, fracture forming limit diagram (FFLD) of two different solution treated i.e. 970 °C (HT970) and 1070 °C (HT1070) Inconel-718 sheets were evaluated by carrying out stretch forming experiments. The obtained failure limiting strains were then transformed into effective plastic strain versus triaxiality locus (ƞEPS-FFLD) and major versus minor principal stress space (σ-FFLD). It was observed that the HT1070 material possessed higher ƞEPS-FFLD and lower σ-FFLD indicating improved formability with reduced deformation load. In order to predict the fracture, six different ductile fracture models incorporating anisotropic properties were calibrated with experimental data. Among all the models, Oh model showed comparatively better prediction with an average absolute error of 10.2% and 10.1% for HT970 and HT1070 materials respectively. However, the model was not able to capture the fracture limits along complete triaxiality path (0.33≤η≤0.66). Therefore, finite element (FE) analysis of deep drawing and stretch forming processes were performed incorporating experimentally evaluated ƞEPS-FFLD and σ-FFLD. The formability in terms of fracture location, limiting draw ratio, wrinkling evolution, thickness distribution, and limiting dome height were predicted successfully using Hills-48 plasticity theory. Also, the microhardness at critical regions of deformed cups was determined and the maximum hardness was found at cup junction of HT970 material especially in case of hemispherical dome cups. Thus, it was suggested that the deep drawn components of HT970 material have better part performance as compared to that of HT1070 material.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 733, 22 August 2018, Pages 393-407
نویسندگان
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