Computer Controlled Rotational Molding of a Hollow Femur for 3-D Photoelastic Analysis
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S. H. Teoh
Abstract
The rotational molding technique was utilized in the fabrication of hollow femur models for the expressed purpose of photostress analysis. Advances in computer control coupled with the development of proper experimental protocols enabled the consistent and automated reproduction of the joint model. Such considerations proved to be critical in overcoming the limitations of prevailing rotational molding operations. The use of hollow rotation molded models was advantageous as it better represented the physiologic constitution of real bones, thereby, conferring a greater degree of accuracy in the photostress experiments. The fabrication of the hollow models entailed flow visualization studies, which assessed the variation in rotational speeds with time as well as the optimum relative rotation speeds to be adopted. The preferred mode of rotational motion was also determined through a series of simulated experiments to determine whether steady or repetitive cyclical rotational modes were more beneficial. The fabricated hip models were loaded and the stress profiles examined. Contour maps of the stress fringes manifested in the photoelastic analysis indicated several sites of stress concentrations. These sites coincided with physiologic patterns of hip fractures, verifying the validity of the hollow femoral models. Computer controlled rotational molding has proven to be a feasible manufacturing process in the development of hollow physiologically representative femur models.
© 1999, Carl Hanser Verlag, Munich
Articles in the same Issue
- Editorial
- Fifth of a Series: Pioneer of Polymer Processing John Wesley Hyatt (1837–1920)
- Internal Mixer
- Modeling the Distributive Mixing in an Internal Batch Mixer
- Biomedical Engineering
- Processing of Biodegradable Polymer Composites as A Drug Delivery System in Vitro
- Fibers and Films
- Tensile Force Measurements in the PA 6 High Speed Fiber Spinning and their Utility
- Crosslinking Modification of UHMWPE Fibers by Ultra-violet Irradiation
- Effect of Wall Slip on Rheotens Mastercurves for Linear PE Melts
- Stability of a Blown Film Extrusion Process
- Molding
- Blank Design and Fiber Orientation Distribution During Compression Molding of GMT
- Injection Moulding of a Commercial β-Nucleated Polypropylene
- Weld Line Strength in PC/ABS Injection Moldings
- Computer Controlled Rotational Molding of a Hollow Femur for 3-D Photoelastic Analysis
- Residual Stresses and Birefringence in Injection Molding of Semicrystalline Polymer
- Residual Stresses and Birefringence in Injection Molding of Semicrystalline Polymer
- Generalized Predictive Observer-Controller For Injection Moulding
- Fiber Orientation in 3-D Injection Molded Features
Articles in the same Issue
- Editorial
- Fifth of a Series: Pioneer of Polymer Processing John Wesley Hyatt (1837–1920)
- Internal Mixer
- Modeling the Distributive Mixing in an Internal Batch Mixer
- Biomedical Engineering
- Processing of Biodegradable Polymer Composites as A Drug Delivery System in Vitro
- Fibers and Films
- Tensile Force Measurements in the PA 6 High Speed Fiber Spinning and their Utility
- Crosslinking Modification of UHMWPE Fibers by Ultra-violet Irradiation
- Effect of Wall Slip on Rheotens Mastercurves for Linear PE Melts
- Stability of a Blown Film Extrusion Process
- Molding
- Blank Design and Fiber Orientation Distribution During Compression Molding of GMT
- Injection Moulding of a Commercial β-Nucleated Polypropylene
- Weld Line Strength in PC/ABS Injection Moldings
- Computer Controlled Rotational Molding of a Hollow Femur for 3-D Photoelastic Analysis
- Residual Stresses and Birefringence in Injection Molding of Semicrystalline Polymer
- Residual Stresses and Birefringence in Injection Molding of Semicrystalline Polymer
- Generalized Predictive Observer-Controller For Injection Moulding
- Fiber Orientation in 3-D Injection Molded Features
