نتایج جستجو برای: Graded layered foam

تعداد نتایج: 78669  

Journal: Mechanics of Advanced Composite Structures 2019
Amir Najibi, Parisa Alizadeh, Payman Ghazifard,

In this article, the results of a study on energy absorption characteristics of foam-filled thin-walled structures with finite element analysis have been presented. Four specimens of thin walled structures have been filled with uniform foam and three specimens have been filled with linear four-layered foam. Also, eight layers HLH (High-Low-High) and eight layers LHL (Low-High-Low) have been sim...

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ژورنال: International Journal of Automotive Engineering 2017
Abdullah, S., Arrifin, A.K., Djamaluddin, F., Nopiah, Z.M.,

In automotive industry, foam-filled structures have aroused increasing interest because of lightweight and capacity of energy absorption. Two types of foam filled thin walled structures such as the uniform foam filled (UF) and the functionally graded foam (FGF). To improve crashworthiness performance, FGF are used to fill structures, unlike existing uniform foam materials. In addition, by seeki...

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ژورنال: بهداشت و ایمنی کار 2021
Ahmadi Asour, Akbar , Fasih-Ramandi, Fatemeh , Hashemi, Zahra , Keyvani, Sepideh , Kolahdouzi, Malihe , Monazzam Esmaielpour, Mohammadreza ,

Introduction: The acoustic performance of natural fiber adsorbents has been investigated in numerous studies. A part of these materials show a poor adsorption within the frequency range of less than 1000 Hz. In the present study, attempts were made to investigate the effect of layout sequence of double-layered composites consisting of natural and synthetic fibers on improving the acoustic adsor...

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Journal: Journal of Computational Applied Mechanics 2020
Okan Kirlangiç, Şeref Akbaş,

The aim of this paper is to compare the static deflections and stress results of layered and functionally graded composite beams under static load. In the comparison study, the results obtained for a cantilever beam under point load. The Timoshenko beam and the Euler-Bernoulli beam theories are used in the beam model. The energy based Ritz method is used for the solution of the problem and alge...

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Journal: :MATERIALS TRANSACTIONS 2013

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Journal: Journal of Solid Mechanics 2011
A.H Sofiyev, S Adiguzel

In this study, the torsional stability analysis is presented for thin cylindrical with the functionally graded (FG) middle layer resting on the Winker elastic foundation. The mechanical properties of functionally graded material (FGM) are assumed to be graded in the thickness direction according to a simple power law and exponential distributions in terms of volume fractions of the constituents...

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Journal: Journal of Solid Mechanics 2018
I Fakhari Golpayegani,

In this paper, an exact analytical solution for free vibration of rotating bi-layered cylindrical shell composed of two independent functionally graded layers was presented. The thicknesses of the shell layers were assumed to be equal and constant. The material properties of the constituents of bi-layered FGM cylindrical shell were graded in the thickness direction of the layers of the shell ac...

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2008
Alan H. Brothers David C. Dunand

The compressive mechanical properties of uniform and density-graded Al-6061 foams, produced by replication of polymer foams, are measured. hile the uniform foam shows compressive behavior characteristic of conventional (uniform) metallic foams with a near constant plateau stress, he density-graded foam exhibits a smoothly rising plateau stress. This behavior is modeled using a simple series com...

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Journal: :Journal of the Japan Institute of Metals and Materials 2013

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2017
Laurent Maheo Philippe Viot Laurent MAHEO Philippe VIOT L. Maheo

Foams, and particularly the polypropylene foam, are more and more often used in the area of injury protection and passive safety for its energy absorption capacity. This multi-scale material is constituted of mesoscopic beads with a large variability of the material properties. To study the effects of these mesoscopic heterogeneities on both the macroscopic and the local behaviors, numerical si...

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