基于超材料热变形的力学实验教学设计

Teaching Design of Mechanical Experiments Based on Thermal Deformation of Metamaterials

  • 摘要: 针对新一代科技革命对学生实践与创新能力提出的更高要求,以拓展学生进阶型力学知识和实验能力为目标,根据材料力学及工程力学等力学基础课程中涉及的材料热变形知识点创新地设计了一种力学课程实验教学。该教学方案针对一种超材料开展热变形实验教学:阐明超材料热膨胀调控原理,并以有限元方法开展数值模拟虚拟实验;以熔融沉积成型工艺制备超材料,并采用数字图像相关方法进行热膨胀系数实验测试,验证超材料具有从正到负热膨胀系数调控的性能。该实验教学融合虚拟仿真和实验测试,不仅培养了学生实践与创新能力,而且将科研与教学有机融合,有效提高了研究型大学中的学生培养质量。

     

    Abstract: In response to the heightened demands of the new technological revolution on students’ practical and innovative capabilities, this study aims to expand students’ advanced mechanical knowledge and experimental skills. Based on the thermal deformation concepts of materials covered in fundamental mechanics courses such as Mechanics of Materials and Engineering Mechanics, we have innovatively designed a mechanical curriculum experiment teaching program. The teaching program carried out thermal deformation experimental teaching for a kind of metamaterial: elucidating the regulation principles of thermal expansion of the metamaterial and carrying out virtual experiments of numerical simulation by the finite element method; preparing metamaterials by the process of fused deposition molding (FDM) and carrying out experimental tests of the coefficient of thermal expansion (CTE) by using the digital image correlation (DIC) method, so as to validate that the metamaterial has the ability to regulate CTEs from positive to negative values. This experimental teaching integrates virtual simulation and experimental testing, which not only cultivates students' practical and innovative abilities, but also organically integrates scientific research and teaching, effectively improving the quality of student training in research universities.

     

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