Topic
SISAL
About: SISAL is a research topic. Over the lifetime, 1878 publications have been published within this topic receiving 55528 citations.
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TL;DR: In this article, the mechanical performance of unsaturated polyester/hybrid sisal-glass fabrics was determined as a function of fibre content and test direction, and the results showed enhanced properties with fibre content for all composites under investigation.
Abstract: Hybridization can alter both mechanical performance and cost of polymer composites, and novel composite materials can be obtained by the combination of both fibrous and mineral reinforcements. In the present work the mechanical performance of unsaturated polyester/hybrid sisal-glass fabrics was determined as a function of fibre content and test direction. Three different hybrid fabrics (30, 40 and 50% w/w glass content) with sisal strings in the warp and glass roving in the weft were hand weaved. Aligned fabric compression moulded composites were obtained at room temperature. The results showed enhanced properties with fibre content for all composites under investigation. Composites reinforced by fabrics with low glass fibre content exhibited lower properties when tested along the glass fibre direction than when tested along the sisal fibre direction and, at high glass fibre content the opposite trend was observed. These behaviours were associated with the low glass fibre content along the test direction and to the high sisal fibre diameter. At low glass fibre content the sisal fibres would act as inclusions or defects, thereby lowering the mechanical performance of the composite; at high glass fibre contents the superior mechanical properties of the glass would surpass the defects caused by sisal fibres.
22 citations
TL;DR: In this paper, the effect of fiber weight percentage and dynamic frequency on dynamic mechanical properties of the sisal composites was studied, and it was also observed that fabric density also plays a significant role in the enhancement of the storage and loss modulus.
Abstract: Due to low cost and environmentally friendly characteristics, natural fibers gain much attention over synthetic fiber. The aim of the present work is to characterize the textile properties of three different types of sisal fabric and study dynamic mechanical properties and water absorption behavior of the sisal fabric reinforced epoxy composite. Influence of grams per square meter of fabric, weaving pattern of the fabric on textile properties of the fabric is studied first. Further, the effect of the same on the dynamic mechanical properties of the sisal composites is studied. Effect of fiber weight percentage and dynamic frequency on dynamic mechanical properties also studied. Results reveal that the storage modulus (G′) decreases with increasing temperature in all the woven types of composites under consideration. However, Plain 2 (P2) and Weft Rib (WR) composites have shown better values of G′ even after the glass transition temperature (Tg). From the results, it is also evident that storage and loss modulus (G′′) increases when the yarn diameter decreases which is observed at a higher temperature also. It is also observed that fabric density also plays a significant role in the enhancement of G′ and G′′ values. The water absorption of Plain 1 (P1) based composites are found to be less compared to the other types of composites analyzed.
22 citations
10 Dec 1991
TL;DR: It is shown that the dataflow approach can profitably be applied outside the classic dataflow world, without the use of specialized hardware, and set SISAL apart from other efforts.
Abstract: In this report we describe the SISAL 2.0 programming language. The project began in 1982 as a cooperative venture by Digital Equipment Corporation, the University of Manchester (England), Lawrence Livermore National Laboratory, and Colorado State University. The project`s goals evolved to become: Define a general-purpose functional language that can run efficiently on conventional and novel parallel architectures; Define a dataflow graph intermediate form independent of language and target architecture; Develop optimization techniques for high-performance applicative computing; Develop a thread management environment to support dataflow-style parallel computing on conventional shared-memory multiprocessors; Achieve sequential and parallel execution performance competitive with program written in conventional languages; and Validate the functional style of programming for large-scale scientific applications. The last three goals set SISAL apart from other efforts. We have shown that the dataflow approach can profitably be applied outside the classic dataflow world, without the use of specialized hardware. SISAL runs on uniprocessors, shared-memory multiprocessors, the Cray-X/MP, the Warp systolic processor as well as Manchester`s dataflow machine. Development continues for the Connection Machine and some experimental systems.
22 citations
TL;DR: In this article, the water absorption behavior of sisal and its epoxy based composites and the mechanical properties of composites that have been aged in water were discussed and a series of fibre pretreatment techniques, including mercerization, acetylation, cyanoethylation, coupling agent treatment and thermal treatment, were evaluated.
Abstract: The authors discuss the water absorption behaviour of sisal and its epoxy based composites and the mechanical properties of composites that have been aged in water. In addition, a series of fibre pretreatment techniques, including mercerization, acetylation, cyanoethylation, coupling agent treatment and thermal treatment, which are believed to be able to improve the water resistance of sisal and its composites, have been evaluated. It was found that the water absorption behaviour of sisal composites is controlled mainly by the fibre and the fibre/matrix interfacial characteristics. As a result, appropriate fibre modification to retard water diffusion and enhance interfacial adhesion is necessary if the natural fibre composites are to be used in practical applications.
22 citations
10 May 2019
TL;DR: In this article, the effect of fiber loading on the mechanical and morphological properties of short sisal fiber reinforced polypropylene polymer-based composites was evaluated. But, the results were limited to three different fiber loading conditions (10, 20 and 30).
Abstract: This work presents a systematic approach to evaluate and study the effect of fiber loading on the mechanical (tensile, flexural, impact and hardness) and morphological (SEM) properties of short sisal fiber reinforced polypropylene polymer-based composites. Short sisal fibers of 3 mm length are incorporated into Polypropylene (PP) in three different fiber loading condition (10, 20 and 30). Composites are fabricated through extrusion followed by injection moulding process. Results are compared with neat PP. Mechanical characterizations are done as per ASTM recommendation and average of five is reported. Experiments show that, at higher fiber loading condition (30%), enhanced mechanical properties are recorded. Fractography is done of the tested specimen through electron microscopy. Images reveal that, fiber entanglement enriches the mechanical interlocking and polymer anchoring inside the composite system. In addition, the elastic behaviors of the produced composites are studied using Representative Volume Element (RVE) method. A good dealing between the models developed with the experimental values is observed.
22 citations