Elasticity Approach to Predict Shape Transformation of Functionally Graded Mechanical Metamaterial under Tension

Materials

Mohammad Javad Mirzaali¹  Ali Barkhordari²  Mohammad Javad Khoshgoftar²  Sajjad Seifoori³ 

[1] Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology (TU Delft), Mekelweg 2, 2628 CD Delft, The Netherlands;Department of Mechanical Engineering, Faculty of Engineering, Arak University, Arak 38156-88349, Iran;Department of Mechanical Engineering, Faculty of Engineering, Vali-e-Asr University of Rafsanjan, Rafsanjan 77188-97111, Iran;

关键词: mechanical metamaterials;    auxetic;    re-entrant structures;    finite element modeling;    theory of elasticity;    shape matching;   

DOI  :  10.3390/ma14133452

来源: DOAJ

【 摘 要 】

The re-entrant structures are among the simple unit cell designs that have been widely used in the design of mechanical metamaterials. Changing the geometrical parameters of these unit cell structures, their overall elastic properties (i.e., elastic stiffness and Poisson’s ratio), can be simultaneously tuned. Therefore, different design strategies (e.g., functional gradient) can be implemented to design advanced engineering materials with unusual properties. Here, using the theory of elasticity and finite element modeling, we propose a fast and direct approach to effectively design the microarchitectures of mechanical metamaterials with re-entrant structures that allow predicting complex deformation shapes under uniaxial tensile loading. We also analyze the efficiency of this method by back calculating the microarchitectural designs of mechanical metamaterials to predict the complex 1-D external contour of objects (e.g., vase and foot). The proposed approach has several applications in creating programmable mechanical metamaterials with shape matching properties for exoskeletal and soft robotic devices.

【 授权许可】

Unknown