TY - GEN
T1 - Morphing composite cylindrical lattices
T2 - AIAA Scitech Forum, 2020
AU - McHale, Ciarán
AU - Carey, Sean
AU - Hadjiloizi, Demetra A.
AU - Weaver, Paul M.
N1 - Publisher Copyright:
© 2020, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.
PY - 2020
Y1 - 2020
N2 - Morphing composite structures offer lightweight, tunable stiff solutions to complex engineering problems, such as deployable spacecraft technology. Notably, the morphing cylindrical lattice is a multi-stable structure that can change from being compact when stowed to being long and thin when deployed. This structure is particularly suited for deployable booms, solar arrays and antennas due to its packaging efficiency and lightweight nature. Current analytical models of these types of structures can only accurately predict the stability characteristics of lattices that use symmetrical laminates. This paper advances mathematical modelling of the lattice through the inclusion of thermal expansion effects of non-symmetrical laminates. Large thermal stresses develop in non-symmetric composite panels in the post cure cool-down of manufacture, caused by the differences in the thermal expansion coefficients above and below the neutral axis. This effect results in undesired thermal warping of the panels. However, using the model developed in this work, this response can be tailored to design a lattice that acts as a thermal actuator, responding purposefully, i.e. by morphing, with the application of heat. This new analytical model is validated through comparison with finite element analysis and experimental tests, showing excellent agreement for both anti-symmetrical and unsymmetrical lattices.
AB - Morphing composite structures offer lightweight, tunable stiff solutions to complex engineering problems, such as deployable spacecraft technology. Notably, the morphing cylindrical lattice is a multi-stable structure that can change from being compact when stowed to being long and thin when deployed. This structure is particularly suited for deployable booms, solar arrays and antennas due to its packaging efficiency and lightweight nature. Current analytical models of these types of structures can only accurately predict the stability characteristics of lattices that use symmetrical laminates. This paper advances mathematical modelling of the lattice through the inclusion of thermal expansion effects of non-symmetrical laminates. Large thermal stresses develop in non-symmetric composite panels in the post cure cool-down of manufacture, caused by the differences in the thermal expansion coefficients above and below the neutral axis. This effect results in undesired thermal warping of the panels. However, using the model developed in this work, this response can be tailored to design a lattice that acts as a thermal actuator, responding purposefully, i.e. by morphing, with the application of heat. This new analytical model is validated through comparison with finite element analysis and experimental tests, showing excellent agreement for both anti-symmetrical and unsymmetrical lattices.
UR - http://www.scopus.com/inward/record.url?scp=85083511152&partnerID=8YFLogxK
U2 - 10.2514/6.2020-0247
DO - 10.2514/6.2020-0247
M3 - Conference contribution
AN - SCOPUS:85083511152
SN - 9781624105951
T3 - AIAA Scitech 2020 Forum
BT - AIAA Scitech 2020 Forum
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
Y2 - 6 January 2020 through 10 January 2020
ER -