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Photoelastic Observations of Corner-Filleted Flexure Hinges Produced by Digital Light Processing Additive Technology

Compliant mechanisms, unlike conventional rigid body mechanisms, achieve mobility fully or partially through deformation of compliant members [1]. A study of corner-filleted flexure hinges produced by Digital Light Processing (DLP) additive technology is presented in this paper. In this regard, complex monolithic geometries can be manufactured by additive technologies at lower cost than with conventional production methods. The DLP technology used to manufacture the studied samples can result in anisotropic material properties, which are challenging when modelling deformation behaviour [2]. Standardised tensile and flexural experimental tests were performed to obtain the samples’ material properties while considering their anisotropic nature. Furthermore, compression tests on circular disk-shaped samples were performed to determine the material photoelastic constant required for photoelastic measurements [3]. The experimentally obtained material properties were simulated with transversely isotropic material model for a finite-element assessment of the behaviour of the studied corner-filleted flexure hinges. Finally, the photoelastic observations of studied hinges were performed and the results comparatively analysed in contrast to the numerical models.

Digital Light Processing (DLP) ; Photoelasticity ; Flexure hinge ; Material behaviour modelling

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