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Mechanical Testing for the Biomechanics EngineerTesting Machine Design and Fabrication

Mechanical Testing for the Biomechanics Engineer: Testing Machine Design and Fabrication CHAPTER 4 Testing Machine Design and Fabrication 4.1 MECHANICAL TESTING Mechanical testing machines grew out of a need to determine the load-bearing ability of objects and the materials from which they are fabricated. From a theoretical standpoint, one can use Newton’s Laws and fundamentals from physics and material science to approximate behavior, but experimental validation is critical. What is needed is a method to apply a load and measure the specimen deformation as it relates to, for example, length and/or shape changes. 4.1.1 FORCE MEASUREMENT In the most basic form, a measurement can be binary—such as a simple “yes” or “no” with respect to the ability of the load to break the specimen. The qualitative nature of this measurement is not very useful by itself and quantitative data is needed. Quantitative data such as the magnitude of the load that broke the object and the amount of deformation prior to failure are very useful pieces of information. Systems to obtain quantitative data can be very simple. A bucket suspended from the object can be used to hold weights added individually until the object breaks. The finer the increments (the smaller the weights), the more precise will be the data. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png

Mechanical Testing for the Biomechanics EngineerTesting Machine Design and Fabrication

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Publisher
Springer International Publishing
Copyright
© Springer Nature Switzerland AG 2015
ISBN
978-3-031-00534-3
Pages
69 –110
DOI
10.1007/978-3-031-01662-2_4
Publisher site
See Chapter on Publisher Site

Abstract

CHAPTER 4 Testing Machine Design and Fabrication 4.1 MECHANICAL TESTING Mechanical testing machines grew out of a need to determine the load-bearing ability of objects and the materials from which they are fabricated. From a theoretical standpoint, one can use Newton’s Laws and fundamentals from physics and material science to approximate behavior, but experimental validation is critical. What is needed is a method to apply a load and measure the specimen deformation as it relates to, for example, length and/or shape changes. 4.1.1 FORCE MEASUREMENT In the most basic form, a measurement can be binary—such as a simple “yes” or “no” with respect to the ability of the load to break the specimen. The qualitative nature of this measurement is not very useful by itself and quantitative data is needed. Quantitative data such as the magnitude of the load that broke the object and the amount of deformation prior to failure are very useful pieces of information. Systems to obtain quantitative data can be very simple. A bucket suspended from the object can be used to hold weights added individually until the object breaks. The finer the increments (the smaller the weights), the more precise will be the data.

Published: Jan 1, 2015

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