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		圆锥压头递增载荷对材料的划痕行为
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			Scratch Behavior of Materials under Progressive Load by Conical Indenter
			 
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		 图4. 切向力Ft和表观摩擦系数μapp随载荷Fn的变化  | 
	
Fig.4. Variation of tangential force Ft and apparent friction coefficient μapp with applied load Fn  | 
	
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