公开(公告)号：US20080033665A1

公开(公告)日：2008-02-07

申请号：US11597752

申请日：2005-08-01

申请人： Marco Beghini ,  Leonardo Bertini ,  Vigilio Fontanari

发明人： Marco Beghini ,  Leonardo Bertini ,  Vigilio Fontanari

IPC分类号： G01L1/00

CPC分类号： G01N3/42 ,  G01N2203/0082 ,  G01N2203/0212 ,  G01N2203/0216 ,  G01N2203/0676 ,  G01N2203/0682

摘要： A method for detecting mechanical features of a material, in particular a metal material, provides a preliminary step where a database is created containing a finite number of reference curves (P,h) (52). Such curves are obtained using a finite elements analysis and reproduce the trend of the applied force (P) responsive to the penetration depth (h) during an indentation test. The reference curves (P,h) are obtained for a determined number of different materials having a known elastic modulus E, and values of yield stress (σsn) and strain-hardening coefficient (n) comprised within determined ranges. The tested sample is then arranged at an indenter, for example a ball indenter (52), for being subject to an indentation test. This is started to cause a graduated penetration of the indenter in the material subject to analysis (53). During the indentation test the penetration depth (h) responsive to the penetration force (P) are measured, and a succession of measured couples (P,h) (54) is then recorded. Such couples of determined values (P,h) are then computed (55), in order to extrapolate from the database at least one reference curve (P,h), for example by a least squares method (56).

摘要翻译： 用于检测材料，特别是金属材料的机械特征的方法提供了初步步骤，其中创建包含有限数量的参考曲线（P，h）（52）的数据库。 使用有限元分析获得这些曲线，并且在缩进测试期间响应于穿透深度（h）再现施加的力（P）的趋势。 对于确定数量的具有已知弹性模量E的不同材料，以及包含在其中的屈服应力（σσ）和应变硬化系数（n）的值，获得参考曲线（P，h） 确定范围。 然后将测试样品设置在压头，例如球压头（52）上，以进行压痕测试。 这开始导致压头在经过分析的材料中逐渐渗透（53）。 在压痕测试期间，测量响应于穿透力（P）的穿透深度（h），然后记录一系列测量对（P，h）（54）。 然后计算这样的确定值的对（P，h）（55），以便例如通过最小二乘法（56）从数据库外推至少一个参考曲线（P，h）。