Cold upset forming and densi cation features in sintered aluminium preforms were investigated. Cylindrical preforms with four initial theoretical densities of 81, 85, 88 and 90% possessing three different aspect ratios of 0 . 50, 0 . 75 and 1 . 0 were prepared using a die and punch assembly with a 1 . 0 MN capacity hydraulic press. The preforms were packed in covered dry ne silica sand before the sintering operation was carried out in an electric muf e furnace at 525¡10°C for a period of 1 h, and subsequently they were furnace cooled. Cold deformation experiments were conducted in incremental deformation steps. The experimental data showed that the ratio of the density of the preform after deformation/theoretical density of the fully dense material r f /r th value demonstrated an increasing trend with increasing value of exp (e z 2e h ), where e z is the true strain in the axial direction e h is that in the hoop direction. It was established that a lower aspect ratio preform exhibited enhanced densi cation compared with the higher aspect ratio preforms, for any given initial preform density. Moreover, the applied stress had the tendency to increase rapidly during the initial stage of densi cation, thereafter continuing to increase at a low rate, as the densi cation was enhanced. The increase in applied stress was found to be associated with the combined effects of densi cation on the geometric and general work hardening parameters.

Abstract. Natural fiber composite materials are such an appropriate material, that replaces synthetic composite materials for many of practical applications where we need high strength and low density. Natural fiber composites combine the technological, ecological and economical aspects. This leads to discovering its vast applications in the aeronautics, automotive, marine and sporting sectors. This paper deals with the study on mechanical characterization (Tensile, Compression and Flexural) of jute/epoxy (JE) polymer composite. The flexural properties of composites are experimentally tested and are simulated in commercially available FEA software. Flexural tested results are in good agreement with FEA results. Scanning electron microscopy (SEM) analysis of the failed samples reveals the matrix dominated failure.

No abstract

Abstract. Natural fiber composite materials are such an appropriate material, that replaces synthetic composite materials for many of practical applications where we need high strength and low density. Natural fiber composites combine the technological, ecological and economical aspects. This leads to discovering its vast applications in the aeronautics, automotive, marine and sporting sectors. This paper deals with the study on mechanical characterization (Tensile, Compression and Flexural) of jute/epoxy (JE) polymer composite. The flexural properties of composites are experimentally tested and are simulated in commercially available FEA software. Flexural tested results are in good agreement with FEA results. Scanning electron microscopy (SEM) analysis of the failed samples reveals the matrix dominated failure.

No abstract