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A method to increase the sensitive range of pressure sensitive film
P J Atkinson1, W N Newberry, T S Atkinson
1Orthopaedic Biomechanics Laboratories, College of Osteopathic Medicine, Michigan State University, East Lansing 48824, USA.
Journal of Biomechanics
|November 5, 1998
Summary
Using multiple pressure-sensitive films simultaneously accurately measures contact pressures in biomechanics. This method enhances data collection for complex, non-uniform pressure distributions in joint contact studies.
Area of Science:
- Biomechanics
- Biomedical Engineering
- Materials Science
Background:
- Pressure-sensitive films are crucial for documenting intra- and extra-articular contact pressures in biomechanical studies.
- Experiments often involve curved surfaces, leading to complex, non-uniform pressure distributions that challenge accurate measurement.
Purpose of the Study:
- To evaluate the feasibility of employing multiple pressure-sensitive films concurrently for precise biomechanical contact pressure and area data acquisition.
- To assess the accuracy of this multi-film approach in scenarios with significant pressure gradients and suprathreshold loading.
Main Methods:
- A composite arrangement of pressure-sensitive films was dynamically loaded using cylindrical indenters with varying radii.
- An analytical model was developed for each indentation to establish a reliable standard for error analysis and validation.
Main Results:
- The study demonstrated that multiple pressure-sensitive films can be used simultaneously to accurately capture contact pressures.
- This technique effectively records data even under loading conditions that create pressure gradients and exceed the threshold of a single film range.
Conclusions:
- Simultaneous use of multiple pressure-sensitive film ranges is a feasible and accurate method for biomechanical contact pressure analysis.
- This approach overcomes limitations of single-film usage, providing reliable data for complex joint loading scenarios.