Study on the Influence of Rapid Prototyping Parameters on Product Quality in 3D Printing

This work aims at evaluating the relative significance of the input parameters on the product quality produced by Z510 3DP rapid fabricator. Taguchi’s L18 orthogonal array was employed to investigate the possible process parameters including binder setting saturation value (shell & core), layer thickness, and build orientation. Using a surface profilometer and CMM, a series of measurements in evaluating the 3DP products surface finish and dimensional accuracy has been carried out. Nonlinear regression model was developed and a statistical analysis was done to determine the significant factors affecting the product quality of the fabricated products. Optimal process parameter settings were proposed using Particle Swarm Optimization technique. The results were validated by conducting the confirmatory experiments.Mechanical Engineerin

Bio Cad Modeling of Customized Exoskeleton for Rehabilitation of Myopathies and its Fabrication Using Additive Manufacturing

Additive Manufacturing (AM) is a process of joining materials to make objects from 3D model data, usually layer upon layer, as opposed to subtractive manufacturing methodologies [1]. This paper proposes the benefits of additive manufacturing (AM) within prosthetic device manufacturing, especially for the customization of exoskeleton for Muscular Disorder patients. This work starts with the patient’s CT scan data of the lower limb in DICOM format. This is exported into MIMICS software to stack 2D scan data into 3D model. Then 3D models are imported in to 3matic software, for modeling a Top and Bottom braces with suitable scaling factor, and creates a connecting structural arrangements in proper dimensions. Wall thickness analysis has been carried out in 3matic software, to find out the standard deviation of top and bottom braces, was found to be 1.65mm.The data from clinical gait analysis were determined as, a 100kg system, the torque required for knee extension during stair climbing was 140 Nm and 50 Nm during walking [2]. Through this promising technique the actual process of prosthesis design in rehabilitation technology is improved by applying reverse engineering and additive manufacturing technologies. The outcome of this work is a personalized prosthesis building procedure that should allow an exoskeleton best fit and avoid the numerous iterations done until a proper fit is obtained with traditional methods.Published versio

Experimental investigation on fracture resistance behavior of additivemanufacturedmultimaterial structure with corrugated interface

It has been a curiosity and the need which has prompted many researchers to work in the area of design and manufacturing for the possibility of building polymer parts with complex shape using additive manufacturing [AM]. As interactions at interfaces have long been of interest in the area of composite materials and adhesive bonding, similar issues need to be addressed for additive manufactured multi material structures. In this study, a PolyJet system is used to fabricate multi material structure which consists of matrix layers (Tango black plus) sandwiched by two reinforcement layers (Vero white).In this work, interface between reinforcement and matrix layer in flat and corrugated shape (sine-wave ridged pattern) is employed. Corrugated shape is commonly found in nature and engineering structure in order to produce a compliant bending was employed in AM multi material structure to enhance its flexural properties. A common experimental approach to characterize shear performance, were evaluated to characterize the fracture resistance of the interface layers with flat and corrugated structures. Experimental results show that corrugated shape interface has the ability to induce passive shear behavior on AM multi material structures than flat shape interface. From this investigation it can be concluded that interface layer with mechanical linkage such as corrugated shape interfaces shows promising results on performance and durability of AM multi material structure.Published versio