An investigation into compressive responses of shape memory polymeric cellular lattice structures fabricated by vat polymerization additive manufacturing |
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| Institution: | 1. International Center for Applied Mechanics, SV Lab, School of Aerospace, Xi’an Jiaotong University, Xi’an 710049, China;2. Columbia Nanomechanics Research Center, Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027, USA;1. Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), P.O. Box 301, No. 92 West Dazhi Street, Harbin 150001, People’s Republic of China;2. National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology (HIT), P.O. Box 3011, No. 2 YiKuang Street, Harbin 150080, People’s Republic of China;1. Science and Technology on Thermostructural Composite Materials Laboratory, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi''an 710072, China;2. International Center for Materials Discovery, School of Materials Science and Engineering, Northwestern Polytechical University, Xi''an 710072, China;3. MSEA International Institute for Materials Genome, Gu''an, 065500, China;4. School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China;5. LMEE-UEVE, Université Paris-Saclay, Evry 91020, France;6. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China;7. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China |
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| Abstract: | A combination of additive manufacturing techniques with shape memory materials, so that the shape, property, or functionality of a 3D printed structure can change as a function of time, has recently created new progress in 4D printing. Low-density lattice structures, due to their unique mechanical properties and engineering characteristics, have been candidates for lightweight structures and energy absorbing applications. In the present work, Rhombic and Body-Centered Cubic (BCC) cellular lattice structures, as well as cylindrical bulk samples, were designed and fabricated with Digital Light Process (DLP) by using shape memory resin. The energy absorption of SMP samples was studied in terms of the capabilities of absorption and recovery. In addition, deformation mechanisms of the structures, the influence of strain rate, cyclic behavior and the strain recovery of the structures after each cycle were investigated. All the studies were done in three different cold, warm and hot programming schemes to evaluate the effects of temperature on shape memory effect of the products. Although both structures showed nearly the same strain recovery rates at all conditions, Rhombic structure was found to possess better functional and structural behaviors than BCC lattice in terms of strength, stiffness, and absorption as well as recovery of the induced energy. |
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| Keywords: | 4D printing 3D printing Shape memory polymer Cellular lattice structure Additive manufacturing Digital light processing (DLP) |
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