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Springback is the geometric change during forming process and it affects the dimensional accuracy of a finished product. This study aims to analyse the issue of springback in sheet bending by using response surface methodology (RSM). The effect of punch travel (d), strain hardening index (n), holding time (t), punch velocity (v) and width of the sheet (w) on the springback was explained by contour plots. The experiments were designed as per Centre Composite design and also linear and quadratic polynomial equations were used for developing the mathematical model. The experimental results of the punch travel, velocity, width of the sheets increased which increases the springback. The holding time increases when the springback decreases. ANOVA analysis was used to identify the most significant factor which affects the springback and it indicates that the springback is inversely proportional to the holding time and the springback is directly proportional to the width of the sheets. The results of scanning electron microscope (SEM) and energy dispersive analysis of X rays analysis for the nickel coated mild steel were also reported.

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This paper presents the recent developments in polymer matrix composites (PMC). Polymer-based composites are widely used materials since the materials have good mechanical properties with low density. Polymer-based materials are used for many applications such as the aerospace industry, automobile industry, sports equipment, construction, and packaging industries. Recently nature fibers have been used as reinforcement materials to synthesize PMCs effectively. Polymer-based materials have been used in biomedical applications. This paper displays the summaries of synthesis, microstructure, and properties of recently reported various PMCs.