A novel 3D structure with tunable Poisson’s ratio and tailorable coefficient of thermal expansion based on a tri-material triangle unitстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 4 августа 2021 г.
Аннотация:Auxetic materials and negative thermal expansion materials show great application potential in many importantfields. In this paper, a novel three‐dimensional truss structure with a tunable Poisson's ratio and tailorablecoefficient of thermal expansion was developed. Since the deformation of each rod was dominated by axial tensionor compression, the structure showed high stiffness. Equations regarding equivalent elasticity parametersand coefficients of thermal expansion of the structure were obtained by displacement and unit force methods. Anumerical simulation verification was performed by ANSYS 16.0 software. The verification results indicatedthat the formulas have high precision and wide application scope. Through parametric analysis, we obtainedthe conditions for achieving a negative Poisson's ratio and negative thermal expansion coefficient. We also concludedthat this material could realize a three‐dimensional negative Poisson's ratio and bidirectional negativethermal expansion simultaneously by choosing reasonable geometric parameters and material combinations.