Performance Analysis of the Mechanical Behaviour of Seams With Various Sewing Parameters for Cotton Canopy Fabrics

This study aims to develop a tool to predict the behaviour under a load of textile seams, to enable the selection of materials for specified end uses in the parachute industry. The strength of an assembly is directly dependent on the strengths of the various joints and seams required to make the structure. This study seeks to understand the performance of seams woven into cotton fabrics. A combination of five parameters has been studied here. Two properties, the seam strength and seam efficiency (% ratio of seam strength to fabric strength), are used as performance estimators. Both were found to vary significantly not only with the primary parameters but also with the interactions of primary parameters as well. That is, they change with each of the primary parameters but vary in a different manner when other parameters also change. Multiple regression has been used to construct preliminary predictor equations.

Predictor Equations for Estimating Crater Dimensions in PMEDM Process Using Fem Simulation and Experimental Validation

In the present study, the powder mixed EDM (PMEDM) process was simulated using FE approach to obtain simulated temperature profiles for estimating the crater dimensions and volume removed during formation of each crater. The craters formed in PMEDM process had higher diameter and shallow depth resulting in improved MRR and better surface finish. The addition of powder increased the amount of heat available at the workpiece between 20-25% as compared to conventional EDM process. The results were subsequently validated experimentally to compare the actual measurements with the simulation output. Predictor equations for crater radius and depth incorporating the significant factors were developed and also validated with the experimental results.