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Viscoelasticity and the Small Punch Creep Recovery Test: Numerical analysis and experimental tests on the applicability for polyvinyl chloride (PVC)
Mechanics of Materials ( IF 3.9 ) Pub Date : 2021-08-12 , DOI: 10.1016/j.mechmat.2021.104016
Jose Calaf-Chica 1 , Pedro Miguel Bravo Díez 1 , Mónica Preciado Calzada 1
Affiliation  

Research on the Small Punch Test (SPT) has been mainly focused on metallic alloys, with limited investigations in polymeric materials. The miniature size of the SPT eases and motivates its use in biomedical applications, like the mechanical characterization of surgical implants made of different polymers. It is noted that the aim of these publications was focused on mechanical properties inherent to the tensile test (yield strength, ultimate tensile strength, Young's modulus, etc.), but the applicability of this miniature test for the estimation of singular polymer properties like viscoelasticity or viscoplasticity has not been addressed.

The aim of this paper was the assessment of SPT as a characterization test for the viscoelastic properties of polymers. To analyze this applicability, numerical FEM simulations of hypothetical materials were performed and a novel Small Punch Creep Recovery Test (SPCRT) was designed. These FEM simulations were verified with experimental compressive creep recovery tests and SPCRTs for specimens made of polyvinyl chloride (PVC). The results showed that SPCRTs accurately estimated the viscoelastic properties for materials with non-stress-dependent viscoelastic properties. In the case of materials with stress-dependent viscoelastic properties, the SPCRT would estimate a mean or intermediate value of these stress-dependent viscoelastic properties.



中文翻译:

粘弹性和小冲头蠕变恢复测试:聚氯乙烯(PVC)适用性的数值分析和实验测试

小冲压试验 (SPT) 的研究主要集中在金属合金上,而对聚合物材料的研究有限。SPT 的微型尺寸简化并促进了其在生物医学应用中的使用,例如由不同聚合物制成的外科植入物的机械特性。值得注意的是,这些出版物的目的是集中在拉伸试验固有的机械性能(屈服强度、极限拉伸强度、杨氏模量等)上,但这种微型试验对估计单一聚合物特性(如粘弹性)的适用性或粘塑性尚未得到解决。

本文的目的是评估 SPT 作为聚合物粘弹性特性的表征测试。为了分析这种适用性,我们对假设材料进行了数值 FEM 模拟,并设计了一种新型小冲头蠕变恢复测试 (SPCRT)。这些 FEM 模拟通过实验性压缩蠕变恢复测试和聚氯乙烯 (PVC) 制成的样品的 SPCRT 进行了验证。结果表明,SPCRTs 准确地估计了具有非应力依赖粘弹性的材料的粘弹性。对于具有与应力相关的粘弹性特性的材料,SPCRT 将估计这些与应力相关的粘弹性特性的平均值或中间值。

更新日期:2021-08-13
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