کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
797994 1467093 2013 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The mechanical behavior of porous metal fiber sintered sheets
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
The mechanical behavior of porous metal fiber sintered sheets
چکیده انگلیسی

Porous metal fiber sintered sheets (MFSSs) are a type of low density cellular materials promising for functional and structural applications. A micromechanics random beam model is proposed to investigate the elasto-plastic behavior of MFSSs. The relative density dependence of the elastic constants and yield strength of MFSSs is predicted and found to agree well with available experimental results. Fiber stretching is identified as the dominant deformation mechanism under uniaxial and multiaxial loading. When compared with two-dimensional Voronoi foams and honeycombs, the stretching deformation dominated MFSSs exhibit higher stiffness and tensile strength, but lower compressive strength due to long fiber buckling. With the developed micromechanics model, the multiaxial elasto-plastic responses of MFSSs are simulated. A macroscopic phenomenological constitutive model with a segmented yield function is proposed to describe the predicted multiaxial responses. The yield function and its evolution can be fully calibrated in terms of the uniaxial tension and compression responses rather than complex multiaxial loading responses, which can greatly facilitate practical applications of the model. This constitutive model is also expected to be applicable to other fiber sintered materials with hydrostatic pressure sensitive and asymmetric tension–compression yielding behaviors.


► A random beam model is developed for sintered metallic fiber sheets.
► The model predicted moduli and strength are consistent with experimental results.
► A proposed yield functionagreeswell with therandom beam model predictions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the Mechanics and Physics of Solids - Volume 61, Issue 1, January 2013, Pages 161–174
نویسندگان
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