Dynamic Mechanical Properties of Functionally Graded Syntactic Epoxy Foam
We investigated dynamic mechanical properties in functionally graded (FG) syntactic foams which had graded distribution of Acrylonitrile micro-balloons in epoxy resin matrix. The density distributions in the FG syntactic epoxy foams were graded by floatin
- PDF / 389,736 Bytes
- 9 Pages / 439.36 x 666.15 pts Page_size
- 104 Downloads / 243 Views
Abstract We investigated dynamic mechanical properties in functionally graded (FG) syntactic foams which had graded distribution of Acrylonitrile micro-balloons in epoxy resin matrix. The density distributions in the FG syntactic epoxy foams were graded by floating phenomenon of the micro-balloons in the matrix resin during curing process. Dynamic viscoelastic measurements and compression tests were conducted to evaluate distributions of mechanical properties in the foams. The dynamic viscoelastic measurements revealed that the thermo-viscoelastic properties of the foams were determined by the properties of the epoxy matrix resin. The static and dynamic compression tests provided relations between the mechanical properties: the compressive Young’s modulus and yield stress, and the density in the foams.
1 Introduction Functionally graded materials (FGMs) [1, 2] were first suggested as materials for relaxing thermal stress in structures. The FGMs can be designed and manufactured to have excellent properties or to suit required conditions of applications by controlling distributions of the phases [2]. Recently, some numerical studies [3–5] have suggested that functionally graded (FG) foams having density distribution are effective for impact energy absorption.
M. Higuchi () School of Mechanical Engineering, Kanazawa University, Kakuma-machi, Kanazawa, 920-1192, Japan e-mail: [email protected] T. Adachi Department of Mechanical Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku, Toyohashi, 441-8580, Japan e-mail: [email protected] Alexander K. Belyaev et al. (eds.), Mechanics and Model-Based Control of Advanced Engineering Systems, DOI 10.1007/978-3-7091-1571-8__19, © Springer-Verlag Wien 2014
171
172
M. Higuchi and T. Adachi
Concurrently with those numerical studies, syntactic foam [6] having density distribution have been produced for the purpose of impact energy absorption [6–10]. The syntactic foams easily fabricated by filling matrix material with small hollow spherical particles (micro-balloons) have light weight and high absorption of mechanical energy [6]. The mechanical properties of the syntactic foams can be adjusted by the volume fraction of the micro-balloons in the matrix material, namely density of foam as well as properties of the matrix material and the microballoons. The authors have developed fabrication process of FG syntactic foams [9–11]. In order to control the distributions of the mechanical properties, the density distributions in the foams are graded by floating phenomenon of the micro-balloons in the matrix resin during curing process [9–11]. In the present study, we investigated distributions of mechanical properties in the FG syntactic epoxy foams which have graded distribution of Acrylonitrile micro-balloons in epoxy resin matrix to apply for impact energy absorption. Dynamic viscoelastic measurements were conducted out to clarify the effect of filling the micro-balloons into the epoxy resin on viscoelastic properties of the FG syntactic epoxy f
Data Loading...
