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Introduction: Composite research is adopting innovative materials in the current period due to their better qualities, such as being lightweight, having excellent mechanical properties, being relatively inexpensive, having a low coefficient of thermal expansion, etc.Methods: Composite materials play a crucial part in this challenge, with the fast market growth for lightweight and high-performance materials. In the present research, different weight percentages of aramid fiber, glass wool, aluminum, and silicon carbide-reinforced high-density polyethylene hybrid composite are introduced. The degree of adhesion between the matrix and reinforcement was determined through microstructural investigation utilizing an optical and scanning electronic microscope.Results: Mechanical properties (tensile behaviors, flexural behavior, impact strength and hardness property) of the fabricated composites are investigated. Comparative study of mechanical properties for different combinations of fabricated composites reveals an increase in elongation at break, flexural strength, flexural modulus and hardness, while tensile strength and impact strength have decreased sequentially from 5 to 40 wt.%.Conclusion: The mechanical properties of HDPE-PPTA-GW-Al-SiC hybrid composites obtained at 40 wt.% PPTA (Poly (p-phenylene terephthalamide)), GW (glass wool), Al, and SiC powder loading are superior as compared to other hybrid composites.

ABSTRACTHybrid composite refers to as an attractive structural material due to its ability to provide a better combination of properties with respect to single-particle-containing composite. Composites were prepared by using customised extruder machine at five levels (10, 20, 30, 40 and 50 wt%) of aluminium powder and silicon carbide loading. Microstructural analysis utilising scanning electron microscope and optical microscope was performed to observe the cohesiveness and distributions of matrix and reinforcement in the composites. Tensile, flexural, impact and hardness tests were conducted for the purpose of mechanical characterisation. Tensile strength increased up to 40 wt% particles loading and then decreased in 50 wt% particles loaded composite. Young’s modulus, flexural strength, flexural modulus, and hardness increased with the increase of aluminium powder and silicon carbide reinforcement loading. On the other hand, impact strength showed an opposite trend. Based on the particle loading and uniformity, 40 wt% aluminium powder and silicon carbide reinforced composite revealed the best set of mechanical properties.

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This paper presents a novel implementation of parallel sparse matrix-matrix multiplication using distributed memory systems on heterogeneous hardware architecture. The proposed algorithm is expected to be linearly scalable up to several thousands of processors for matrices with dimensions over 106(million). Our approach of parallelism is based on 1D decomposition and can work for both structured and unstructured sparse matrices. The storage mechanism is based on distributed hash lists, which reduces the latency for accessing and modifying an element of the product matrix, while reducing the overall merging time of the partial results computed by the processors. Theoretically, the time and space complexity of our algorithm is linearly proportional to the total number of non-zero elements in the product matrix C. The results of the performance evaluation show that the algorithm scales much better for sparse matrices with bigger dimensions. The speedup achieved using our algorithm is much better than other existing 1D algorithms. We have been able to achieve about 500 times speedup with only 672 processors. We also identified the impact of hardware architecture on scalability.

The present research focuses on the effects of aluminum (Al) and silicon carbide (SiC) hybridization on mechanical and morphological properties of Al and SiC particles reinforced hybrid epoxy composites. Composites were prepared by hand lay-up technique at five levels of reinforcement loading (10, 20, 30, 40, and 50 wt%). Aluminum powder and silicon carbide particles were utilized as reinforcement at a ratio of (1:1) during composite preparation. Microstructural analysis using a scanning electronic microscope and optical microscope was performed to observe the adhesiveness between the matrix and reinforcement. For mechanical characterization, tensile, flexural, impact, and hardness tests were performed. Tensile and flexural strength decreased, while Young’s modulus, flexural modulus, impact strength, and hardness increased with increase in aluminum and silicon carbide particle loading. Based on the particle loading, 50 wt% of particle-reinforced composite had the best set of mechanical properties among all prepared composites.