理想八面体点阵结构力学模型优化及力学性能测试分析

利用光固化立体成型技术(SLA)制备了不同相对密度的光敏树脂基体理想八面体结构,并对其进行紫外固化处理,通过理论计算、实验测试以及数值模拟的方式对八面体点阵结构的力学性能进行了分析.实验结果表明八面体点阵结构的压缩模量以及抗压强度随着相对密度的增加而上升,相对密度从11.3%提升至27.9%,弹性模量上升了3.5倍左右,抗压强度上升2.6倍左右.利用ABAQUS有限元软件对实验过程进行了模拟,数值模拟结果与实验结果具有良好的一致性.在理论计算中,对Deshpande等提出的八面体点阵结构计算模型(DFA模型)进行了修正,计算结果显示修正后的计算结果更接近实验值与模拟值.

Improved Micromechanics Model and Mechanical Property Evaluation of Ideal Octet Truss Lattice Material

The ideal octet-truss structure of photosensitive resin with different relative density was prepared by Stereolithography Apparatus and cured by UV. The mechanical properties of octet-truss lattice structure were analyzed by theoretical calculation, experimental test and numerical simulation. The experimental results show that the compressive modulus and compressive strength of octet-turss lattice structure increase with the increase of relative density. As the relative density increases from 11.3 % to 27.9 %, the elastic modulus increases by about 3.5 times and the compressive strength increases by about 2.6 times. The experimental process is simulated by ABAQUS finite element software, and the numerical simulation results are in good agreement with the experimental results. In the theoretical calculation, the octet lattice structure calculation model (DFA model) proposed by Deshpande et al.is modified. The calculation results show that the modified model is more close to the experimental and simulated values than the original model