Fatigue testing of flexure hinges for the purpose of the development of a high-precision micro manipulator
An approach was initially proposed for the estimation of the maximum von Mises stress in flexure hinges. It relied on recognizing relevant stress factors that were calculated from empirical functions set up by using the finite element method. Afterwards, a fatigue test bench was designed and realize...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2014-10-01
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| Series: | Mechanical Sciences |
| Online Access: | http://www.mech-sci.net/5/59/2014/ms-5-59-2014.pdf |
| Summary: | An approach was initially proposed for the estimation of the
maximum von Mises stress in flexure hinges. It relied on recognizing
relevant stress factors that were calculated from empirical functions set up
by using the finite element method. Afterwards, a fatigue test bench was
designed and realized for the examination of flexure hinge specimens. As
functional failure occurred before fracture, crack initiation and
propagation were observed permanently with the help of a monitoring system
and sporadically by means of scanning electron microscopy. On the basis of
results obtained thereby, where varying the maximum rotation angle, the
operating frequency and the quality of the notch surfaces, a correlation was
established between the stress limit and the number of cycles up to
functional failure. This was utilized for the optimal dimensioning of
flexure hinges within the framework of the development of a high-precision
micro manipulator. |
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| ISSN: | 2191-9151 2191-916X |