This paper explores the ability to tailor the mechanical properties of composite compliant shell mechanisms, by exploiting the thermal prestress introduced during the composite laminate cure. An extension of an analytical tape spring model with composite thermal analysis is presented, and the effect of the thermal prestress is studied by means of energy landscapes for the cylindrical composite shells. Tape springs that would otherwise be monostable structures become bistable and exhibit greater ranges of low-energy twisting with thermally induced prestress. Predicted shell geometries are compared with finite element (FE) results and manufactured samples, showing good agreement between all approaches. Wider challenges around the manufacture of prestressed composite compliant mechanisms are discussed.
Thermal Prestress in Composite Compliant Shell Mechanisms
Contributed by the Mechanisms and Robotics Committee of ASME for publication in the JOURNAL OF MECHANISMS AND ROBOTICS. Manuscript received October 15, 2018; final manuscript received January 4, 2019; published online February 22, 2019. Assoc. Editor: Andreas Mueller.
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Stacey, J. P., O'Donnell, M. P., and Schenk, M. (February 22, 2019). "Thermal Prestress in Composite Compliant Shell Mechanisms." ASME. J. Mechanisms Robotics. April 2019; 11(2): 020908. https://doi.org/10.1115/1.4042476
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