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Experimental evaluation of interlaminar shear stress of CAJRAL type fibre metal laminates prepared with surface treated aluminium sheet by sobbing technique

Asirvatham A.D., Hynes N.R.J., Selvan P., Vignesh N.J., Jebaraj D.J.J., Benita B.

Archives of Materials Science and Engineering

2024

Vol. 125, nr 1

15--21

Purpose: Fiber metal laminates (FML) are a new composite, particularly the CAJRAL type laminate, consisting of aluminium and a carbon/jute/epoxy composite. The present work aims to develop low-density Fiber metal laminates (FML) with good mechanical properties for aerospace applications. Design/methodology/approach: FML combines the good characteristics of metal, such as ductility and durability, with the benefits of fibre composite materials, such as high specific strength, high specific stiffness, good corrosion resistance and fatigue resistance. The present work introduces an FML consisting of aluminium and Carbon/Jute/epoxy layers. The FML was produced by the hand lay-up technique. The aluminium sheets were surface-treated with the sobbing method. Two combinations of laminate sequencing were selected: Ca 0°/Ca 45°/Al/Ju 45° and Ca 0°/Al/Ca 0°/Al/Ju 0°. Findings: The structure characterisation after bending tests is shown and discussed. The three point-bending tests are conducted according to ASTM D 2344 standard specifications. Sample-1 (Ca 0°/Ca 45°/Al/Ju 45°/Ju 45°/Al/Ca 45°/Ca 0°) is a better result. Research limitations/implications: Preliminary studies have shown that the metal layers in the laminates and the composite carbon layer, particularly in the bend area of the laminate, significantly impact the nature of the damage. Laminate indicates the complexity of the degradation process of these materials. Practical implications: The orientation of the reinforcing fibres influences the degree of the laminate structure and affects the ability to form laminates. An important factor influencing the properties of the laminate as a whole is to provide high adhesive properties of the composite-metal connections. Originality/value: By replacing aluminium with jute. It is observed that the tensile and flexure stresses of the CAJRAL with Ca 0°/Ca 45°/Al/Ju 45°/Ju 45°/Al/Ca 45°/Ca 0° are more compared with Ca 0°/Al/Ca 0°/Al/Ju 0°/Ju 0°/Al/Ca 0°/Al/Ca 0°.

Investigation on surface roughness and kerf analysis in abrasive water jet machining of silicon carbide

Hynes N.R.J., Asirvatham A.D., Sankaranarayanan R., Raja S., Benita B., Atchaya J.

Archives of Materials Science and Engineering

2023

Vol. 120, nr 1

30--35

Purpose: Machining silicon carbide (SiC) is challenging due to its brittle and maximum tensile nature. Lapping or laser beam are done with a high cost of manufacturing and low material removal rates. Water abrasive jet cutting is a promising candidate since the machining temperatures and processing force of ceramics are extremely low. Investigation into the abrasive water jet machining of silicon carbide is carried out in the present work. Design/methodology/approach: The variations in traverse speed while abrasive water jet cutting of silicon carbide and its effect on the surface roughness and kerf characteristics are studied. Silicon Carbide abrasive material is used as garnet consisting of 80 mesh. The surface roughness was calculated along with the depth of the cut made during the processing. Findings: The outcomes demonstrated that the traverse speed is more effective upon the surface roughness and is an important factor that damages the top kerf width and the kerf taper angle. Research limitations/implications: Based on the hardness and thickness of the SiC plate, the taper angle is high, and for a feed rate of 10 mm/min, the surface roughness is low. Less thickness of the SiC plate could have a lower taper angle than with high thickness. The erosive force is provided by abrasive material along with the jet stream. Practical implications: Water abrasive fine jet could effectively machinate silicon carbide ceramic material with a better surface finish accurately. Suitable surface roughness with higher productivity can be attained with medium traverse speed. Originality/value: The effect of process parameters on kerf taper angle and top kerf width in the abrasive water jet machining of silicon carbide is explored, considering surface roughness as an important output parameter.