Study of interfacial stiffness ratio of a rough surface in contact using a spring model

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• 作者：M. Gonzalez-Valadez ; A. Baltazar ; R.S. Dwyer-Joyce
• 关键词：Ultrasound ; Rough contact ; Interfacial stiffness
• 刊名：Wear
• 出版年：2010
• 出版时间：4 February 2010
• 年：2010
• 卷：268
• 期：3-4
• 页码：373-379
• 全文大小：921 K

文摘

This study proposes the use of a simple spring model that relates the interfacial stiffness with the complex reflection coefficient of ultrasound in a rough contact. The spring model cannot be directly related to the real area of contact as this depends on the amount, shape and distribution of contacting asperities. However, it is clear that the model provides a non-destructive tool to easily evaluate both longitudinal and shear interfacial stiffnesses and their ratio. Experimental findings indicate that the interfacial stiffness ratio K_τ/K_σ determined during loading/unloading cycles is sensitive to the roughness level and load hysteresis. The results deviate from the theoretical available micromechanical models, indicating that actual contacting phenomenon is more complex and other variables needed are not accounted for by the models.