Materials Science Forum Vol. 1054

Abstract: The Single point incremental sheet forming process known as a SPIF process. Which got a great attraction among other existed sheet metal forming processes because of their flexibility to manufacture complex products. The aluminum alloy material mechanical properties are adopted and integrated into the finite element (FE) code. The tool paths for the truncated cone shape are modeled in Fusion 360 software, and the coordinates are converted into 3D punch tool coordinates by the tool path generation framework tool for modeling the numerical simulation. In numerical modeling, three kinds of mesh settings are used to construct the mesh for producing consistent results. Afterward, the obtained results are tested against the experimental observations and the desired parts dimensions to verify the accuracy of the established FE model. Thickness variations in the formed parts are discussed in detail in terms of the thinning part, thinning location, and its size in percentage. A comparison of tested geometries displays that reduction in thickness tends to be uniform in the wall region and small fluctuation noticed near the tool retraction location. Overall, the statistical results of the SPIF process are well in contract with the experimental measurements. In terms of geometry dimensions and thickness reduction. In addition, the surface roughness was noticed to be increased when the step size is more extensive, and on the other hand, the machining time tends to be more if the contour step size is small in the SPIF process.

Abstract: Weft knitted single jersey (S/J) and lycra single jersey (lycra S/J) fabrics are popular in the textile industry for their lightweight and excellent physical and dimensional properties. However, the property investigation is required to ensure the quality before starting bulk production with any fabrics. The main aim of this study is to compare the physical and dimensional properties of S/J and lycra S/J with considering the manufacturing parameters in order to reduce the manufacturing time as well as cost. The physical properties such as grey GSM (Gram per square meter), finish GSM, bursting strength, color fastness to washing and rubbing; dimensional properties i.e., shrinkage and spirality of S/J and lycra S/J fabric have been investigated and compared while the manufacturing parameters stitch length, machine diameter, machine gauge, number of needles, width etc. and finishing parameters were same. In this current research, the internationally approved methods are performed for example ISO to test fabric GSM, spirality and color fastness to wash; ASTM for bursting strength test; AATCC to measure the shrinkage and color fastness to rubbing or crocking. During the investigation, it is observed that there is a significant difference between grey GSM, finish GSM and bursting strength for both of the fabrics. Moreover, the shrinkage property of lycra S/J fabric is better than S/J fabric. In terms of color fastness to rubbing and spirality, slight differences are found too. However, in case of color fastness to wash, both fabrics exhibited similar behavior.