[1] [1] Lee D Y, Kim J K, Sohn C Y, Heo J M and Cho K J 2021 High–load capacity origami transformable wheelSci. Robot.6eabe0201

[2] [2] Tao Y, Gao C Y, Shi Y S, Li M H, Zhang M L and Liu D L 2022 Analysis of motion characteristics and stability of mobile robot based on a transformable wheel mechanismAppl. Sci.1212348

[3] [3] Felton S M, Lee D Y, Cho K J and Wood R J 2014 A passive, origami-inspired, continuously variable transmissionProc. of 2014 IEEE Int. Conf. on Robotics and Automation(Hong Kong, China) (IEEE) pp 2913–8

[4] [4] Lee D Y, Kim J S, Kim S R, Koh J S and Cho K J 2013 The deformable wheel robot using magic-ball origami structureProc. 2013 Int. Design Engineering Technical Conf.s and Computers and Information in Engineering Conf. V06BT07A040(American Society of Mechanical Engineers)

[5] [5] Kim Y S, Jung G P, Kim H, Cho K J and Chu C N 2014 Wheel transformer: a wheel-leg hybrid robot with passive transformable wheelsIEEE Trans. Robot.301487–98

[6] [6] Bai L, Guan J, Chen X H, Hou J Z and Duan W B 2018 An optional passive/active transformable wheel-legged mobility concept for search and rescue robotsRobot. Autom. Syst.107145–55

[7] [7] Zeng W, Gao F, Jiang H, Huang C, Liu J X and Li H F 2018 Design and analysis of a compliant variable-diameter mechanism used in variable-diameter wheels for lunar roverMech. Mach. Theory125240–58

[8] [8] Aoki T, Murayama Y and Hirose S 2014 Development of a transformable three-wheeled lunar rover: tri-Star IVJ. Field Robot.31206–23

[9] [9] Lee D Y, Jung G P, Sin M K, Ahn S H and Cho K J 2013 Deformable wheel robot based on origami structureProc. of 2013 IEEE Int. Conf. on Robotics and Automation(IEEE)Karlsruhe, Germanypp 5612–7

[10] [10] Fonseca L M and Savi M A 2020 Nonlinear dynamics of an autonomous robot with deformable origami wheelsInt. J. Non-Linear Mech.125103533

[11] [11] Won J, Ryu S, Kim S, Yoo K Y, Kim H S and Seo T 2022 Design optimization of a linkage-based 2-DOF wheel mechanism for stable step climbingSci. Rep.1216912

[12] [12] Lin C, Liu L W, Liu Y J and Leng J S 2022 4D printing of shape memory polybutylene succinate/polylactic acid (PBS/PLA) and its potential applicationsCompos. Struct.279114729

[13] [13] Cho S Y, Ho D H, Jo S B and Cho J H 2024 Direct 4D printing of functionally graded hydrogel networks for biodegradable, untethered, and multimorphic soft robotsInt. J. Extrem. Manuf.6025002

[14] [14] Zhao S C, Maas M, Jansen K and van Hecke M 2019 3D printed actuators: reversibility, relaxation, and ratchetingAdv. Funct. Mater.291905545

[15] [15] Hua D C, Zhang X Q, Ji Z Y, Yan C Y, Yu B, Li Y D, Wang X L and Zhou F 2018 3D printing of shape changing composites for constructing flexible paper-based photothermal bilayer actuatorsJ. Mater. Chem.C62123–31

[16] [16] Zhao Z A, Kuang X, Yuan C, Qi H J and Fang D N 2018 Hydrophilic/hydrophobic composite shape-shifting structuresACS Appl. Mater. Interfaces1019932–9

[17] [17] Kim Y, Yuk H, Zhao R K, Chester S A and Zhao X H 2018 Printing ferromagnetic domains for untethered fast-transforming soft materialsNature558274–9

[18] [18] Lyu Z Y, Wang J L and Chen Y F 2023 4D printing: interdisciplinary integration of smart materials, structural design, and new functionalityInt. J. Extrem. Manuf.5032011

[19] [19] Wei H Q, Zhang Q W, Yao Y T, Liu L W, Liu Y J and Leng J S 2017 Direct-write fabrication of 4D active shape-changing structures based on a shape memory polymer and its nanocompositeACS Appl. Mater. Interfaces9876–83

[20] [20] Wang W, Li C Z, Cho M and Ahn S H 2018 Soft tendril-inspired grippers: shape morphing of programmable polymer–paper bilayer compositesACS Appl. Mater. Interfaces1010419–27

[21] [21] Chen D Bet al2020 4D printing strain self-sensing and temperature self-sensing integrated sensor–actuator with bioinspired gradient gapsAdv. Sci.72000584

[22] [22] Dong K, Panahi-Sarmad M, Cui Z Y, Huang X Y and Xiao X L 2021 Electro-induced shape memory effect of 4D printed auxetic composite using PLA/TPU/CNT filament embedded synergistically with continuous carbon fiber: a theoretical & experimental analysisCompositesB220108994

[23] [23] Zeng C J, Liu L W, Bian W F, Liu Y J and Leng J S 2020 4D printed electro-induced continuous carbon fiber reinforced shape memory polymer composites with excellent bending resistanceCompositesB194108034

[24] [24] Huo Z Y, He J K, Pu H Y, Luo J and Li D C 2022 Design and printing of embedded conductive patterns in liquid crystal elastomer for programmable electrothermal actuationVirtual Phys. Prototyp.17881–93

[25] [25] Shao L H, Zhao B X, Zhang Q, Xing Y F and Zhang K 2020 4D printing composite with electrically controlled local deformationExtrem. Mech. Lett.39100793

[26] [26] Zhang G Q, Wang Y H, Chen Z W, Xu X G, Dong K and Xiong Y 2023 Robot-assisted conformal additive manufacturing for continuous fibre-reinforced grid-stiffened shell structuresVirtual Phys. Prototyp.18e2203695

[27] [27] Roach D J, Sun X H, Peng X R, Demoly F, Zhou K and Qi H J 2022 4D printed multifunctional composites with cooling-rate mediated tunable shape morphingAdv. Funct. Mater.322203236

[28] [28] Zhang Q, Kuang X, Weng S Y, Zhao Z A, Chen H S, Fang D N and Qi H J 2020 Rapid volatilization induced mechanically robust shape-morphing structures toward 4D printingACS Appl. Mater. Interfaces1217979–87

[29] [29] Weng S Y, Kuang X, Zhang Q, Hamel C M, Roach D J, Hu N and Jerry Qi H 2021 4D printing of glass fiber-regulated shape shifting structures with high stiffnessACS Appl. Mater. Interfaces1312797–804

[30] [30] Yuan C, Wang F F and Ge Q 2021 Multimaterial direct 4D printing of high stiffness structures with large bending curvatureExtrem. Mech. Lett.42101122

[31] [31] Monzn M D, Paz R, Pei E, Ortega F, Surez L A, Ortega Z, Alemn M E, Plucinski T and Clow N 2017 4D printing: processability and measurement of recovery force in shape memory polymersInt. J. Adv. Manuf. Technol.891827–36

[32] [32] Akbari S, Sakhaei A H, Kowsari K, Yang B, Serjouei A, Yuanfang Z and Ge Q 2018 Enhanced multimaterial 4D printing with active hingesSmart Mater. Struct.27065027

[33] [33] Lpez-Valdeolivas M, Liu D Q, Broer D J and Snchez-Somolinos C 2018 4D printed actuators with soft-robotic functionsMacromol. Rapid Commun.391700710

[34] [34] Kotikian A, Truby R L, Boley J W, White T J and Lewis J A 2018 3D printing of liquid crystal elastomeric actuators with spatially programed nematic orderAdv. Mater.301706164

[35] [35] Zhang Y F, Li Z H, Li H K, Li H G, Xiong Y, Zhu X Y, Lan H B and Ge Q 2021 Fractal-based stretchable circuits via electric-field-driven microscale 3D printing for localized heating of shape memory polymers in 4D printingACS Appl. Mater. Interfaces1341414–23

[36] [36] Chu G H, Zhou B, Shao G B, Zhang D J and Li L Q 2021 Four-dimensional printing of alternate-actuated composite structures for reversible deformation under continuous reciprocation loadingFront. Mater.8661593

[37] [37] van Manen T, Janbaz S, Jansen K M B and Zadpoor A A 2021 4D printing of reconfigurable metamaterials and devicesCommun. Mater.256

[38] [38] Demoly F, Dunn M L, Wood K L, Qi H J and Andr J C 2021 The status, barriers, challenges, and future in design for 4D printingMater. Des.212110193

[39] [39] Ge Q, Dunn C K, Qi H J and Dunn M L 2014 Active origami by 4D printingSmart Mater. Struct.23094007

[40] [40] Mao Y Q, Yu K, Isakov M S, Wu J T, Dunn M L and Jerry Qi H 2015 Sequential self-folding structures by 3D printed digital shape memory polymersSci. Rep.513616

[41] [41] Ding Z, Yuan C, Peng X R, Wang T J, Qi H J and Dunn M L 2017 Direct 4D printing via active composite materialsSci. Adv.3e1602890

[42] [42] Zhang H, Guo X G, Wu J, Fang D N and Zhang Y H 2018 Soft mechanical metamaterials with unusual swelling behavior and tunable stress-strain curvesSci. Adv.4eaar8535

[43] [43] Baker A B, Bates S R G, Llewellyn-Jones T M, Valori L P B, Dicker M P M and Trask R S 2019 4D printing with robust thermoplastic polyurethane hydrogel-elastomer trilayersMater. Des.163107544

[44] [44] Yu Y X, Liu H L, Qian K R, Yang H, McGehee M, Gu J Z, Luo D L, Yao L N and Zhang Y J 2020 Material characterization and precise finite element analysis of fiber reinforced thermoplastic composites for 4D printingComput. Aided Des.122102817

[45] [45] Zou B H, Song C, He Z P and Ju J 2022 Encoding of direct 4D printing of isotropic single-material system for double-curvature and multimodal morphingExtrem. Mech. Lett.54101779

[46] [46] Qiao J, Li Y R and Li L Q 2019 Ultrasound-assisted 3D printing of continuous fiber-reinforced thermoplastic (FRTP) compositesAddit. Manuf.30100926

[47] [47] Banerjee H, Kakde S and Ren H L 2018 OrumBot: origami-based deformable robot inspired by an umbrella structureProc. 2018 IEEE Int. Conf. on Robotics and Biomimetics(Kuala Lumpur, Malaysia) (IEEE) pp 910–5

[48] [48] Jia Z Z, Smith W and Peng H 2012 Terramechanics-based wheel–terrain interaction model and its applications to off-road wheeled mobile robotsRobotica30491–503

[49] [49] Yuan C, Roach D J, Dunn C K, Mu Q Y, Kuang X, Yakacki C M, Wang T J, Yu K and Qi H J 2017 3D printed reversible shape changing soft actuators assisted by liquid crystal elastomersSoft Matter135558–68

[50] [50] Chu G H, Tian H C, Deng X H, Wang W Y, Qiao J and Li L Q 2024 Assembly-free fabrication of the deformable system composed by continuous fiber embedded 4D printing actuatorsJ. Manuf. Process.110238–51

[51] [51] Jeong D and Lee K 2015 OrigamiBot-II: an amphibious robot with reconfigurable origami wheels for locomotion in dynamic environmentsProc. ASME 2015 Int. Mechanical Engineering Congress and Exposition. V04AT04A026(Houston, Texas, USA) (American Society of Mechanical Engineers)

[52] [52] Rhoads B P and Su H J 2016 The design and fabrication of a deformable origami wheelProc. 2016 Int. Design Engineering Technical Conf. and Computers and Information in Engineering Conf. V05BT07A021(Charlotte, North Carolina, USA) (American Society of Mechanical Engineers)

[53] [53] Yang C C, Wang B J, Li D C and Tian X Y 2017 Modelling and characterisation for the responsive performance of CF/PLA and CF/PEEK smart materials fabricated by 4D printingVirtual Phys. Prototyp.1269–76

[54] [54] Roach D J, Kuang X, Yuan C, Chen K J and Qi H J 2018 Novel ink for ambient condition printing of liquid crystal elastomers for 4D printingSmart Mater. Struct.27125011