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Experimental Determination of Surface Energy and Elastic Modulus of Solid Material using JKR Theory
|關鍵字:||JKR theory;JKR理論;surface energy;elastic modulus;表面能;彈性模數||出版社:||機械工程學系||摘要:||
The thermodynamic characteristics of solid materials in surface energy and elastic modulus are investigated using the contact mechanism developed by the JKR theory. Six plastic materials with different surface hardness are selected to demonstrate the use of the theory. The contact between a semispherical surface and a plane, both made of the plastic materials, are conducted by the micro-contact-force measuring instrument. The materials properties of the solid plastics are therefore obtained by the method of the numerical fitting based on the least square error between the JKR equation and the micro-deformation of the spherical surface varied with the contact force.
The results show that the contact deformations and hence the surface energy during unloading process are greater than the counterparts in the loading contact, because of the hysteresis effect. While it is found that a unique value of contact modulus is obtained for each plastic material without affected by the forward or reversing loading action. The higher surface energy associated with the harder plastic surface is evidenced by the present investigated. Comparisons are made between the present results and that obtained from Young's equation, using the dynamic contact angle analyzer.
|Appears in Collections:||機械工程學系所|
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