High Strain Rate Response of Cenosphere-Filled Aluminum Alloy Syntactic Foam
- PDF / 2,355,712 Bytes
- 9 Pages / 593.972 x 792 pts Page_size
- 80 Downloads / 176 Views
JMEPEG https://doi.org/10.1007/s11665-019-04237-2
High Strain Rate Response of Cenosphere-Filled Aluminum Alloy Syntactic Foam M.D. Goel
, Venkitanarayanan Parameswaran, and D.P. Mondal
(Submitted May 7, 2018; in revised form July 11, 2019) Deformation of metal foams under high rate of loading is a complex phenomenon due to the effects of various parameters involved therein. In the present investigation, cenosphere-filled aluminum alloy syntactic foam is studied under high rate of loading in comparison with their quasi-static behavior. The experiments, for high strain rates, are carried out using split Hopkinson pressure bar and full stress–strain curves of foam are developed under such rate of loadings. Foams with three different cenosphere sizes at three different high rates of loadings are investigated for their mechanical behavior. Compressive behavior and energy absorption capacity are reported considering the effect of high loading rates and cenosphere sizes. It is observed that, increase in loading rate results in higher strength of foams by an amount of 1632%. Further, it is observed that energy absorption is improved with the increase in strain rates and cenosphere sizes and this improvement is observed in the range of 80-182%. Based on deformation modes and failure damage study, using SEM microstructure, deformation mechanism is observed to be almost independent of strain rate increment particularly at higher strain rates considered in this investigation. Moreover, there exists a limiting value of strain rate beyond which there is an insignificant increase in compressive strength of foams considered in the present investigation. Keywords
cenosphere, high loading rate, high-speed imaging, syntactic foam
1. Introduction During the last few years, due to increased frequencies of blast all over the world, different materials are being developed and investigated for their possible applications in blast/impact protection. It is to be noted that from many available advanced materials, lightweight metal and polymeric foams are well known for their capabilities in blast/impact mitigation response. Due to this unique capability, demand of foams has increased in various sectors such as naval, aerospace and defense. These lightweight foam materials can be made of polymer, metal and other naturally occurring materials. Metal foams are a new class of materials and can be tailored for their mechanical properties with particular focus on their end application. In comparison with dense materials, metallic foams have very low densities, higher energy absorbing capability, higher specific stiffness, and improved acoustic damping and mechanical properties. These metallic foams are smart option for various applications, wherein they are used as sandwich cores in structural application, packaging along with blast-resistant structures/components (Ref 1). M.D. Goel, Department of Applied Mechanics, Visvesvaraya National Institute of Technology (VNIT), Nagpur 440 010, India; Venkitanarayanan Parameswaran, Department of Mechanic
Data Loading...
