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Biaxial test and hyperelastic material models of silicone elastomer fabricated by extrusion-based additive manufacturing for wearable biomedical devices.
Journal of the Mechanical Behavior of Biomedical Materials ( IF 3.9 ) Pub Date : 2020-03-26 , DOI: 10.1016/j.jmbbm.2020.103733
Ketut B Putra 1 , Xiaoqing Tian 2 , Jeffrey Plott 3 , Albert Shih 4
Affiliation  

Biaxial tensile testing of the silicone elastomer fabricated by additive manufacturing (AM) for wearable biomedical devices is presented. Silicone elastomer has unique mechanical properties ideal for stretchable parts in wearable biomedical devices. Biaxial tensile testing, in comparison to the uniaxial tensile and compression tests, is more representative for materials with large, multidirectional stretch. This study investigates the experimental setup and methods to measure and characterize mechanical properties of AM solid and porous silicone elastomer sheets on equi-biaxial stretch (with the stretch ratio up to 2). Four hyperelastic material models were applied to characterize the AM silicone sheet and evaluated through the finite element analysis (FEA) to quantify the fit to biaxial tensile test results. The Yeoh model with C10 = 80.7 kPa, C20 = –2.11 kPa, and C30 = 0.22 kPa has the best match to the experimentally measured stress-strain curve as well as the force and strain in FEA. This study demonstrates that the effects of raster angle and thickness are insignificant in the stress-strain curve of an AM silicone elastomer with solid cross-section. This study also demonstrates that AM can fabricate anisotropic porous silicone elastomer parts with different stiffness in x- and y-directions.



中文翻译:

通过基于挤压的增材制造技术为可穿戴生物医学设备制造的有机硅弹性体的双轴测试和超弹性材料模型。

提出了通过增材制造(AM)制造的可穿戴生物医学设备的有机硅弹性体的双轴拉伸测试。有机硅弹性体具有独特的机械性能,非常适合可穿戴生物医学设备中的可拉伸部件。与单轴拉伸和压缩测试相比,双轴拉伸测试对于具有大的多方向拉伸的材料更具代表性。本研究调查了在等双轴拉伸(拉伸比最大为2)下测量和表征AM固体和多孔有机硅弹性体片材机械性能的实验装置和方法。应用了四个超弹性材料模型来表征AM硅树脂片,并通过有限元分析(FEA)进行了评估,以量化对双轴拉伸测试结果的拟合度。杨模型C 10  = 80.7 kPa,C 20  = –2.11 kPa和C 30  = 0.22 kPa与实验测量的应力-应变曲线以及有限元分析中的力和应变最匹配。这项研究表明,在具有实心横截面的AM有机硅弹性体的应力-应变曲线中,光栅角度和厚度的影响微不足道。这项研究还表明,AM可以制造在xy方向具有不同刚度的各向异性多孔有机硅弹性体零件。

更新日期:2020-03-26
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