کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6916065 862935 2016 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A shear deformable, rotation-free isogeometric shell formulation
ترجمه فارسی عنوان
فرموله سازی پوسته ی ایزوگومتریک بدون تغییر شکل برش، برش
کلمات کلیدی
عناصر محدود ایزوگومتریک، بدون چرخش پوسته درجه سلسله مراتب آزادی، قفل کردن، تقسیم جابجایی،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر نرم افزارهای علوم کامپیوتر
چکیده انگلیسی
A finite element formulation for a geometrically linear, shear deformable (Reissner-Mindlin type) shell theory is presented, which exclusively uses displacement degrees of freedom. The total displacement is subdivided into a part representing the membrane and bending deformation, enriched by two extra “shear displacements”, representing transverse shear deformation. This rotation-free approach is accomplished within the isogeometric concept, using C1-continuous, quadratic NURBS as shape functions. The particular displacement parametrization decouples transverse shear from bending and thus the formulation is free from transverse shear locking by construction, i.e. locking is avoided on the theory level, not by choice of a particular discretization. Compared to the hierarchic formulation proposed earlier within the group of the authors (Echter et al., 2013), the method presented herein avoids artificial oscillations of the transverse shear forces. Up to now, a similar, displacement based method to avoid membrane locking has not been found. Thus, in the present formulation the mixed method from Echter et al. (2013) is used to avoid membrane locking.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computer Methods in Applied Mechanics and Engineering - Volume 307, 1 August 2016, Pages 235-255
نویسندگان
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