Recent advances in expansive soil stabilization using admixtures: current challenges and opportunities

This study investigates the comparison of the microstructural and mechanical properties of a novel ternary reinforced AA7075 hybrid metal matrix composite. Four samples, including AA7075 (base alloy), AA7075-5wt %SiC (MMC), AA7075-5wt %SiC-3wt %RHA (s-HMMC), and AA7075-5wt %SiC-3wt %RHA-1wt %CES (n-HMMC) were developed using the stir casting liquid metallurgy route, followed by the heat treatment. The experimental densities corresponded with the theoretical values, confirming the successful fabrication of the samples. A minimum density of 2714 kg/m3 was recorded for the n-HMMC. In addition, the highest porosity of 3.11% was found for n-HMMC. Furthermore, an increase of 24.4% in ultimate tensile strength and 32.8% in hardness of the n-HMMC was recorded compared to the base alloy. However, its ductility and impact strength was compromised with the lower values of 5.98% and 1.5 J, respectively. This was confirmed by microstructural analysis, which reveals that n-HMMC has mixing issues and forms agglomerates in the matrix, which served as the potential sites of stress concentration leading to low impact strength and ductility. Nevertheless, the hybrid composites showed superior mechanical properties over the MMC and its base alloy.

/pdf/investigating-the-microstructural-and-mechanical-properties-22690d7r.pdf

Investigating the Microstructural and Mechanical Properties of Novel Ternary Reinforced AA7075 Hybrid Metal Matrix Composite

Recycled acrylonitrile butadiene styrene (RABS) has undesirable thermal properties that cause the material to shrink and not adhere to the printing bed during three-dimensional (3D) printing. In order to address this issue, virgin acrylonitrile butadiene styrene (VABS) of varying weight proportions (i.e., 10–50%) is blended with RABS to fabricate parts at various printing temperatures (i.e., 230 °C, 240 °C, and 250 °C). The study emphasizes to achieve proper inter-layer bonding and enhancing the physical and mechanical characteristics of the final product made from RABS. It was found that blending of VABS up to 40% in RABS with components fabricated at 240 °C resulted in the highest improvement in physical and mechanical properties. The 60% RABS/40%VABS sample printed at 240 °C exhibits improvements in Young's modulus (E), yield strength (σy), and ultimate tensile strength (UTS) by 13.69%, 13.37%, and 15.64%, respectively. Moreover, the RABS sample blended with 20% VABS exhibited comparable flexural results to the 100% VABS samples as blending VABS enhances molecular chain bonding and provides better elasticity to the material. 

3D printing with recycled ABS resin: Effect of blending and printing temperature

As fuel prices rise and environmental rules become more stringent, there is pressure on the aerospace sector to create lighter, more efficient aircraft. Fuel usage is significantly reduced as a result of using lightweight alloys to make the aircraft as a whole lighter. Composites prepared from aluminium matrix are widely employed in the automotive and aeronautical sectors because of their excellent strength and wear rate characteristics. This study describes the mechanical, corrosion and wear characteristics of hybrid aluminium composites utilized in aeronautical applications. The aircraft industry needs aluminium alloys with better mechanical properties if it is to use them successfully. According to published studies, adding reinforcing particles repeatedly can increase mechanical attributes of prepared composites. As a result of soft and hard reinforcing particles incorporation, the resulting hybrid composites are less brittle and have higher wear resistance. Commonly used ceramic particulates inclusion such as silicon carbide, alumina, zirconium oxide (ZrO2) and aluminium nitride would induced a substantial strength and wear resistance as well as egg shell, coconut shell ash, bagasse ash and groundnut shell ash derivative from agro wastes. Hybrid composites with different types of reinforcement percentage were found to be homogenous and uniform distribution. In conclusion, the analysis reveals that hybrid composites based on aluminium have enormous potential in aircraft sector to replace aluminium alloy as well as composite with single reinforcement where less weight, high performance strength and minimum wear rate are required. 

A summary of current advancements in hybrid composites based on aluminium matrix in aerospace applications

Development and characterization of sustainable 3D printing filaments using post-consumer recycled PET: processing and characterization

Waste plastic exposed to the environment creates problems and is of significant concern for all life forms. To reuse the waste plastic in a well-organized manner and make it more productive, extrusion-based additive manufacturing, specially fused deposition modeling technique, can be an effective way. Hence, the primary objective of this work is to reuse ABS waste for developing sustainable three-dimensional printing filaments. A mixed feedstock processing approach is used to develop filaments, in which recycled ABS is blended with virgin ABS in weight ratio of 10%–50%. The rheological and thermo-mechanical properties of the extruded filaments were examined. Results indicated that increasing extrusion temperature from 190°C to 195°C produced significant physical changes in ABS blends. There is a breakdown of styrene acrylonitrile and butadiene component in ABS which causes strain hardening and material stiffening. The Young's modulus, yield strength and ultimate tensile strength of 80% RABS/20% VABS filament were found to be 2329, 34.814 and 40.82 MPa, respectively, which is close to VABS filament. The novel filament produced from recycled/virgin ABS blends has the capability to replace commercially available ABS filaments for fabricating high-quality plastic parts through an additive manufacturing routine. 

Development of sustainable
 3D
 printing filaments using recycled/virgin
 ABS
 blends: Processing and characterization

Effect of marble dust reinforcement in composites for different applications: A review

Glass-filled polyamide (GF/PA) is an important engineering material for automotive industry because of its excellent physical, thermal and mechanical properties. But it is challenging to produce high quality functional parts through additive manufacturing technology like selective laser sintering (SLS). It is due to fact that SLS made parts exhibit high dependence on the sintering conditions. Thus, it becomes essential to adjust these sintering conditions accurately to improve physical properties like density and hardness to enhance the widespread use of this technology. Therefore, this study presents a statistical analysis of the SLS process parameters led by a design of experiment to extract information about their influence on hardness and density of the PA 3200 GF composite. GF/PA with a refresh rate of 60:40 was used for the part fabrication and the effect of five key sintering parameters has been considered for analysis. Experiments revealed that poor material integrity and weak interaction between the particles at lower energy density were the main reason for the lower hardness and density of fabricated parts.

Laser powder bed fusion of glass-filled polyamide-composite with enhanced physical properties

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Papers

3D printing with recycled ABS resin: Effect of blending and printing temperature

Development of sustainable 3D printing filaments using recycled/virgin ABS blends: Processing and characterization

Development and characterization of sustainable 3D printing filaments using post-consumer recycled PET: processing and characterization

Effect of marble dust reinforcement in composites for different applications: A review

Laser powder bed fusion of glass-filled polyamide-composite with enhanced physical properties