Method for approximately obtaining elastic-plastic parameters of metal based on Knoop indenter indentation method

• Main Authors: GAO BINGJUN, CHEN XIAODONG, YU CHULIN, DONG JUNHUA
• Format: Patent
• Language: Chinese; English
• Published: 25.10.2022
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MEASURING; PHYSICS; TESTING

The invention relates to a method for approximately acquiring elastic-plastic parameters of metal based on a Knoop indenter indentation method, which comprises the following steps of: acquiring a load displacement curve in an indentation process, extracting curve fitting parameters, and performing numerical processing and calculation on each load displacement point on a loading section curve to obtain a corresponding curve of an energy-to-power ratio changing along with indentation depth; and three independent indentation characteristic parameters such as a load displacement curve unloading section slope, a work ratio depth curve work ratio slope and a work ratio maximum value are extracted, so that the elastic-plastic parameters are approximately obtained. Due to the unique pressing head shape of the Knoop type pressing head, the method is small in pressing depth, high in measurement precision and good in material measurement nondestructive property, and the technical problem that in the prior art, elastic-p