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A novel technique for four-point bending of small bone samples with semi-automatic analysis
Edward R C Draper1, Allen E Goodship
1Divisional Care Department of Orthopaedic & Trauma Surgery, Imperial College School of Medicine, Division of Surgery Anaesthetics, Charing Cross Hospital (7th Floor), Fulham Palace Road, London W6 8RF, UK. e.draper@ic.ac.uk
Journal of Biomechanics
|September 23, 2003
Summary
This study introduces a novel system for calculating surface stress and strain using stiff contacts and crosshead displacement measurements. This method allows for rapid, semi-automatic analysis with results aligning with existing literature.
Area of Science:
- Materials Science
- Mechanical Engineering
- Solid Mechanics
Background:
- Accurate measurement of surface stress and strain is crucial in materials testing.
- Existing methods may require complex setups or extensive user intervention.
- The compliance of testing systems can affect measurement accuracy.
Purpose of the Study:
- To develop a novel system for semi-automatic calculation of surface stress and strain.
- To enhance the stiffness of the testing system for improved accuracy.
- To enable rapid analysis with minimal user input.
Main Methods:
- Designing a testing system incorporating stiff radius edge contacts.
- Utilizing crosshead position for displacement measurement instead of mid-span.
- Developing equations for semi-automatic calculation of surface stress and strain.
- Accounting for system compliance in calculations.
Main Results:
- The developed system achieves high stiffness through the use of radius edge contacts.
- Novel strain equations based on crosshead position provide accurate results.
- The system allows for rapid analysis with minimal user intervention.
- Obtained results demonstrate agreement with established literature values.
Conclusions:
- The novel system offers a stiff and accurate approach to surface stress and strain analysis.
- Semi-automatic calculations based on crosshead displacement streamline the testing process.
- This method provides a reliable alternative for materials testing research.