کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
829499 1470341 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterisation and investigation of local variations in mechanical behaviour in cast aluminium using gradient solidification, Digital Image Correlation and finite element simulation
ترجمه فارسی عنوان
تعریف و بررسی تغییرات محلی در رفتار مکانیکی در آلومینیوم ریخته گری با استفاده از کریستال گرادیان، همبستگی تصویر دیجیتال و شبیه سازی عناصر محدود
کلمات کلیدی
ریخته گری، رفتار سازنده، رفتار مکانیکی، آلومینیوم، همبستگی تصویر دیجیتال، رفتار پلاستیک
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی (عمومی)
چکیده انگلیسی


• The effect of local variations in microstructure in cast aluminium is investigated.
• The strain field during tensile testing is measured using Digital Image Correlation.
• Microstructural variations are shown to cause local variations in the strain field.
• The distribution of strains can be predicted using a proposed simulation strategy.
• A homogeneous material description fails to predict the effect of local variations.

Due to design and process-related factors, there are local variations in the microstructure and mechanical behaviour of cast components. This work establishes a Digital Image Correlation (DIC) based method for characterisation and investigation of the effects of such local variations on the behaviour of a high pressure, die cast (HPDC) aluminium alloy. Plastic behaviour is studied using gradient solidified samples and characterisation models for the parameters of the Hollomon equation are developed, based on microstructural refinement. Samples with controlled microstructural variations are produced and the observed DIC strain field is compared with Finite Element Method (FEM) simulation results. The results show that the DIC based method can be applied to characterise local mechanical behaviour with high accuracy. The microstructural variations are observed to cause a redistribution of strain during tensile loading. This redistribution of strain can be predicted in the FEM simulation by incorporating local mechanical behaviour using the developed characterisation model. A homogeneous FEM simulation is unable to predict the observed behaviour. The results motivate the application of a previously proposed simulation strategy, which is able to predict and incorporate local variations in mechanical behaviour into FEM simulations already in the design process for cast components.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials & Design - Volume 56, April 2014, Pages 755–762
نویسندگان
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