International Digital Imaging Correlation Society - Proceedings of the First Annual Conference, 2016
International Digital Imaging Correlation Society - Proceedings of the First Annual Conference, 2016
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国际数字成像相关学会 - 2016 年第一届年会论文集
DOI：
10.1007/978-3-319-51439-0_47
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Davis F
中科院分区：
文献类型：
--
作者：
Davis F
填充和未填充的弹性体通常都被建模为不可压缩的固体。然而，对弹性体可压缩性的研究表明，随着空化的开始，在大拉伸时可以观察到体积膨胀。不同的方法，如膨胀法和流体静力称重法，已被用于计算弹性体在拉伸过程中所经历的体积变化。然而，这些技术不能绘制异质应力状态下的体积变化，这激发了目前的工作。在本研究中，炭黑填充弹性体样品受到单轴拉伸，并使用两个背对背的立体相关系统记录变形。背对背立体相关系统允许在试样的正面和背面的平面应变计算与正常应变通过厚度。采用平面应力假设，确定了弹性体的体积随纵向应变的变化规律。
Both filled and unfilled elastomers are generally modeled as incompressible solids. However studies on the compressibility of elastomers have indicated that volume expansion is observed at large stretches coinciding with the onset of cavitation. Varying methods such as dilatometry and hydrostatic weighting have been used to calculate volume changes that elastomers undergo during stretching. However, these techniques cannot map volume variations for a heterogeneous state of stress, motivating the present work. In this study, carbon black filled elastomer samples were subjected to a uniaxial stretch and the deformation was recorded using two back-to-back stereo-correlation systems. The back-to-back stereo-correlation systems allow the in-plane strains on the front and back face of the specimen to be calculated along with the normal strain through the thickness. Using the assumption of plane stress, the volume variation of the elastomer as a function of the applied longitudinal strain was determined.