2016, Volume 11, Issue 2
Frontiers of Mechanical Engineering >> 2016, Volume 11, Issue 2 doi: 10.1007/s11465-016-0392-z
Understanding coupled factors that affect the modelling accuracy of typical planar compliant mechanisms
1. School of Engineering, University College Cork, Cork T12 YN60, Ireland.
2. School of Engineering, University College Cork, Cork T12 YN60, Ireland; Department of Mechanical Engineering, Trakya University, Edirne, Turkey.
3. School of Mechatronics, Xidian University, Xi’an 710071, China.
4. School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China
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Abstract
In order to accurately model compliant mechanism utilizing plate flexures, qualitative planar stress (Young’s modulus) and planar strain (plate modulus) assumptions are not feasible. This paper investigates a quantitative equivalent modulus using nonlinear finite element analysis (FEA) to reflect coupled factors in affecting the modelling accuracy of two typical distributed-compliance mechanisms. It has been shown that all parameters have influences on the equivalent modulus with different degrees; that the presence of large load-stiffening effect makes the equivalent modulus significantly deviate from the planar assumptions in two ideal scenarios; and that a plate modulus assumption is more reasonable for a very large out-of-plane thickness if the beam length is large.
Keywords
coupling factors ; modelling accuracy ; compliant mechanisms ; equivalent modulus
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