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±¾ÈËÔÚJournal of Materials ScienceÉÏͶÁËһƪÎÄÕ£¬·¢»ØÁ˾ܸåÒâ¼û¡£±¾ÈËÈÏΪÉó¸åÈ˵ÄÒâ¼ûÍêÈ«ÊÇ´íÎóµÄ£¬Èç¹ûÒÀ¾ÝËûµÄ˵»°£¬ºÜ¶àר¼ÒºÍѧÕß×öÁ˺ܶà´íÎóµÄ¹¤×÷¡£ÓдóÁ¿µÄ¸ßµµ´ÎÎÄÏ×Ϊ֤¡£¸ÃÔõô¸ø±à¼Ð´ÐÅÁË£¿Éó¸åÈËûÓп¼ÂÇϵÊý¦ÂÔÚÌØÊâÇé¿öÏ¿ɽüËÆÈÏΪÊÇÒ»¸ö³£Êý£¬¶øÈ«ÅÌ·ñÈÏÎҵŤ×÷¡£ ÕâÊÇÉó¸åÈ˵ÄÒâ¼û£º The authors invetigate by nanoindentation the mechanical responses of different elastic-plastic film-substrate combinations using FEM. The elastic modulus measurement relies on the well known Sneddon relationship which must be written with a correction coefficient ¦Â as (see literature) That the authors write in a different manner with a coefficient c* in the following form To determine the elastic modulus the authors choose a constant value for c* (or ¦Â) proposed by Dao. The big issue of this choice is that the correction coefficient ¦Â is not a constant parameter but depends on penetration depth, E/¦Òy ratio and strain hardening exponent n, as recently demonstrated by Abbes et al., J. Micromech. Microeng. 20 (2010) 065003. This very important paper put in questions many of the previously published papers. Consequently, the content of the present paper is completely wrong and cannot be published. Tha authors can verify themselves, since they made FEM, that for each penetration depth the value of ¦Â to satisfy the relationship must take different values when the penetration is varied and also when the mechanical properties of the sample are varied. Çë¸÷λר¼ÒºÍÐÖµÜÌṩÒâ¼û!лл£¡ |
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