کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1449076 988690 2008 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure-based finite element analysis of strain localization behavior in AA5754 aluminum sheet
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Microstructure-based finite element analysis of strain localization behavior in AA5754 aluminum sheet
چکیده انگلیسی

A finite element (FE) analysis incorporating particles and grain structure is used to study the localization behavior of direct chill cast (DC) and strip cast (CC) AA5754 alloy sheet. A two-dimensional (2D) plane stress FE model is used to simulate deformation of a sample under uniaxial tension prior to necking. A 2D plane strain model is then used to simulate the post-necking behavior, up to fracture. The plane stress model shows that the strain required for the initiation of necking is similar in both materials, determined predominately by grain-level inhomogeneity, with constituent particles altering the localization path and localization strains, but only weakly. The plane strain model shows more through-thickness thinning during post-necking deformation of DC sheets compared with CC sheets. The CC material is also prone to shear-type failure, while the DC material exhibits a cup–cone-type failure. These differences arise from the microstructural difference between the two samples, where CC sheets contain more intermetallic particles in stringers compared with the DC sheets. This two-stage model is validated by experimental data which show similar limit strains in the DC and CC sheets but quite different fracture strains and fracture surface geometries.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 56, Issue 13, August 2008, Pages 3187–3201
نویسندگان
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