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2 results on '"Chung Kiat Teo"'

1. Crack prediction of plastic housing subjected to impact loading

Author

Chung Kiat Teo, Chai Gin Boay, Hoon Kay Hiang, and School of Mechanical and Production Engineering

Subjects
Engineering::Manufacturing::Product engineering [DRNTU], Engineering, business.industry, Impact loading, Forensic engineering, business
Abstract

This report establishes a procedure or methodology to model and predict potential plastic crack on plastic housing at impact. A test rig is designed and fabricated to deliver tensile impact load to plastic tensile bar specimens and the final displacement on the plastic specimens at fracture are obtained. These values are used in the finite element analysis (FEA) simulation to establish thresholds to predict failure of product housing when impact loaded. Various notch sizes are introduced on the tensile specimens to study the effect of notch-induced crack. Similarly, the fracture displacements are also used in the FE modelling to obtain threshold. Dynatup drop dart test is also employed to study cracks on a multi-axial stress state. MASTER OF ENGINEERING (EEE)

Published
2019
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2. Integration of Laser Surface Digitizing with CAD/CAM Techniques for Developing Facial Prostheses. Part 1: Design and Fabrication of Prosthesis Replicas.

Author

Chi-Mun Cheah, Chee-Kai Chua, Kwang-Hui Tan, and Chung-Kiat Teo

Subjects
PROSTHODONTICS, CAD/CAM systems, TREATMENT of facial abnormality, LASERS in dentistry, MAXILLOFACIAL prosthesis, EXTRAORAL traction appliances
Abstract

Purpose: This article presents a novel manufacturing approach that integrates laser surface digitizing/scanning and computer-aided design (CAD) and manufacturing (CAM) to achieve automated fabrication of spatially and anatomically accurate extraoral facial prostheses. Materials and Methods: Topologic data of the patient's face, including the site of deformity and the anatomy of a healthy "donor" organ, were acquired using laser surface digitizing. Two different CAD data manipulation techniques were developed to alleviate problems encountered in laser-digitized data sets. To reduce patient involvement, fitting of the prosthesis was conducted using a computer model of the patient's face. Once finalized, rapid prototyping techniques were employed to fabricate a master pattern to cast the final prosthesis. Results: Three case studies involving different facial prostheses were conducted to evaluate the integrated manufacturing system. The results demonstrated the many advantages of the system for facial prosthesis production. Conclusion: With the new manufacturing approach, reduced patient discomfort, minimal dependence on the artistic skills of the prosthetist, and short turnaround times for prosthesis production can be expected. [ABSTRACT FROM AUTHOR]

Published
2003

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