Abstract
Abstract. This work is dedicated to the study of the large-displacement behaviour of a spiral spring. Parameters that influence the local torsion stiffness of the beam that constitutes the spiral are varied and their effect is studied. Cross-sectional shape, orthotropic material orientation and prestress are the three classes of parameters that are varied. The effect that the local change in torsional stiffness has on the overall behaviour is illustrated in a linearised way by comparing in-plane and out-of-plane stiffnesses, and nonlinearly, by inspecting a graphical representation of the potential energy field of the system. Several embodiments composed of multiple spirals are showed to illustrate how the understanding of the nonlinear behaviour could be exploited in conceptual design of compliant mechanisms.
Highlights
In the process of designing compliant mechanisms an important step is often the tailoring of the nonlinear stiffness behavior
The use of potential energy field (PEF) as visual aids enhances the understanding of the elastic behavior of systems with large deflections
5 Discussion We present a study on the effect of different types of parameters on the elastic behavior of a spiral shaped spring
Summary
In the process of designing compliant mechanisms an important step is often the tailoring of the nonlinear stiffness behavior. This open profile has a comparatively low torsion-to-bending stiffness ratio These examples show that the cross-section shape, the material orientation and the application of prestress are ways to selectively increase compliance in certain directions in despite of other directions. That in the given examples the goal is limited to a rotational motion about an axis, as fixed as possible It is worthwhile exploring alternative global shapes and combine them with various cross-sections, material orientation and prestress conditions. Current work presents the results of an exploratory study on the effects of cross-sectional shape, material orientation and prestress on the large deflection elastic behavior of a given complex beam geometry.
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