Peculiarities of using dumbbell specimens made of elastomeric materials subject to finite deformation in complex loading tests

IF 0.8 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Letters on Materials Pub Date : 2023-03-01 DOI:10.22226/2410-3535-2023-1-56-61
V. Shadrin, A. Svistkov, K. Mokhireva, O. Garishin
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Abstract

The features of experiments with dumbbell specimens performed to determine the mechanical properties of filled elastomers are analyzed. Emphasis is placed on testing materials that experience a complex loading history. Experiments such as cyclic loading with increasing amplitude of deformations and with nested stress / strain cycles are considered. It has been established that the rate of change of the stretch ratio in the central part (gauge section) of the specimen significantly differs from that calculated from the analysis of the positions of the grips. This difference manifests itself more prominently in the experiments with complex loading algorithms. The reason is that the viscoelastic properties and the Mullins effect of the filled elastomer are different in the central part of the specimen and at its ends near the grips. The presence of inhomogeneous deformation in the gauge section leads to additional difficulties associated with finding constants for constitutive equations. Besides, this phenomenon complicates a comparison of the mechanical properties of different materials, because detailed information on their behavior can be obtained in complex experiments only. So, experiments with straight specimens or rings with a rectangular cross-section offer more possibilities for studying the mechanical properties of filled elastomers than the experiments with dumbbell specimens.
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弹性材料哑铃试样在复杂载荷试验中受有限变形的特点
分析了用哑铃试样测定填充弹性体力学性能的实验特点。重点放在测试经历复杂加载历史的材料上。考虑了诸如具有增加的变形幅度和嵌套的应力/应变循环的循环载荷的实验。已经确定,试样中心部分(标距截面)拉伸比的变化率与通过夹具位置分析计算的变化率显著不同。这种差异在复杂加载算法的实验中表现得更为突出。原因是填充弹性体的粘弹性性质和穆林斯效应在试样的中心部分和靠近夹具的端部不同。规范截面中不均匀变形的存在导致了与寻找本构方程常数相关的额外困难。此外,这种现象使不同材料的力学性能的比较变得复杂,因为只有在复杂的实验中才能获得关于它们行为的详细信息。因此,与哑铃试样相比,用矩形截面的直试样或环进行的实验为研究填充弹性体的力学性能提供了更多的可能性。
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来源期刊
Letters on Materials
Letters on Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
1.60
自引率
14.30%
发文量
48
期刊介绍: The aim of "Letters on materials" is to provide a fast publication of short research and review articles on various topics in materials science and related areas of material physics and mechanics. The editorial board sees it''s own task in rapid informing of the readers on the state-of-the-art challenges and achievements in materials science. The editorial board does its best to select high quality papers reporting new scientific results that are of interest for researchers in materials science, physics, and mechanics. "Letters on materials" invites Russian and foreign researches to publish papers in both the Russian and English languages. The scope of the journal covers the following research areas: structure analysis of materials, mechanical and physical properties of materials, production and processing of materials, experimental methods of investigation of materials, theory and computational methods in solid state physics. "Letters on materials" is designed for researchers, engineers, lecturers, and students working in the areas of materials science, mechanical engineering, metal forming, physics, and material mechanics.
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