Measurement and Analysis of Deformation Behavior of Thermoplastic Elastomer Tube Subjected to Biaxial Tensile Stress under loading and unloading
Measurement and Analysis of Deformation Behavior of Thermoplastic Elastomer Tube Subjected to Biaxial Tensile Stress under loading and unloading
复制标题
热塑性弹性体管在双向拉伸应力作用下加卸载变形行为的测量与分析
DOI：
10.1007/s12289-023-01752-5
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发表时间：
2023
影响因子：
2.4
通讯作者：
Nonomura C.
中科院分区：
文献类型：
--
作者：
Kubo S.;Kuwabara T.;Sumiyama T.;Kobayashi T.;Furuichi K.;Nonomura C.
开发了一种测量聚合物管材双向变形行为的材料测试装置，以定量评估聚合物材料的变形行为。该测试装置可以对管状试样施加轴向力和内压。还开发了一种非接触式应变测量系统，连续测量试样轴向的双轴应变分量和曲率半径，以控制施加到试样上的应力路径。使用外径为 15 mm、厚度为 2 mm 的热塑性弹性体管作为测试样品。样品承受应力比为 1:1 和 0:1 的线性应力路径，其中分别是施加到胀形样品中心的轴向和周向应力分量。在几乎恒定的对数应变率 1 × 10–3s−1 下测量每个线性应力路径的双轴应力-应变曲线。在应力空间中绘制的等塑性功等值线显示了测试材料的显着各向异性。提出了一种准确再现测试样品的加工硬化行为和变形行为的材料模型。
A material testing apparatus for measuring the biaxial deformation behavior of a polymer tube is developed to quantitatively evaluate the deformation behavior of polymeric materials. The testing apparatus can apply axial force and internal pressure to a tubular specimen. A noncontact strain measurement system, where the biaxial strain components and the radius of curvature in the axial direction of the specimen are continuously measured to control the stress path applied to the specimen, is also developed. Thermoplastic elastomer tubes with an outer diameter of 15 mm and a thickness of 2 mm are used as test samples. The samples are subjected to linear stress paths with stress ratios of, and 0:1, whereandare the axial and circumferential stress components, respectively, applied to the center of the bulging specimen. Biaxial stress–strain curves are measured for each linear stress path at a nearly constant logarithmic strain rate of 1 × 10–3s−1. The contours of equal plastic work plotted in thestress space show significant anisotropy of the test material. A material model for accurately reproducing both the work-hardening behavior and deformation behavior of the test samples is proposed.