弹性体表面固体颗粒冲击载荷下裂纹萌生及发展方向的理论依据

IF 0.5 4区 工程技术 Q4 ENGINEERING, MECHANICAL
V. G. Kopchenkov
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引用次数: 0

摘要

建立了弹性体在集中载荷作用下应力-应变状态形成的理论模型。采用偏振光学方法进行了实验研究。以具有典型橡胶物理力学特性的透明L-83聚氨酯为样品。结果表明,由数学模型的理论解计算得到的表层应力-应变状态与实验数据吻合。加载时,会产生压应力和拉应力区域。拉伸应力的大小决定了表面破坏(撕裂)的可能性。斜向冲击的模拟证实了弹性体在集中载荷作用下应力-应变状态的定性图像。一项理论研究使得有可能确定变形势能分布在表层的深度上,与施力点(即固体颗粒与弹性体表面的接触点)距离的平方成反比。这使得用数学方法计算表面层磨损体积中能量耗散的水平和分布成为可能。理论和实践研究表明,在实际使用弹性体衬里时,建议与固体流动方向成接近90°的夹角安装。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Theoretical Substantiation of the Initiation and Direction of Crack Development under Impact Loading of the Elastomer Surface by Solid Particles

Theoretical Substantiation of the Initiation and Direction of Crack Development under Impact Loading of the Elastomer Surface by Solid Particles

A theoretical model of the formation of the stress-strain state in elastomers under the action of a concentrated load is considered. Experimental studies were carried out using the polarization-optical method. As a sample, transparent L-83 polyurethane with physical and mechanical characteristics corresponding to typical rubbers was used. It is shown that the stress-strain state of the surface layer calculated as a result of the theoretical solution of the mathematical model coincides with the experimental data. When loading, zones of compressive and tensile stresses are created. The magnitude of the tensile stress determines the likelihood of surface destruction (tearing). Simulation of an oblique impact confirmed the qualitative picture of the stress-strain state in elastomers under the action of a concentrated load. A theoretical study made it possible to establish that the potential energy of deformation is distributed over the depth of the surface layer in inverse proportion to the square of the distance from the point of application of the force, i.e., the point of contact of the solid particle with the surface of the elastomer. This makes it possible to mathematically calculate the level and distribution of energy dissipation in the wear volume of the surface layer. Theoretical and practical studies have shown that in the practical use of elastomer linings, it is recommended to install them at an angle close to 90° to the direction of solids flow.

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来源期刊
Journal of Friction and Wear
Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
1.50
自引率
28.60%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.
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