Bending preload micro-nano indentation mechanical properties test method and device

Abstract

The invention relates to a method and a device for testing the mechanical properties of bending preload micro / nano-indentations. The device integrates a bending module and a micro / nano-indentation module, wherein the bending module and the indentation module are respectively composed of a drive unit, a transmission unit, an execution unit and a signal detection and control unit, and the indentation module can complete the precise positioning and macro point-change actions of a diamond indenter. The method comprises the following steps: firstly, driving a bending module servo motor to drive a bending indenter to press in a test-piece, so that a bending preload is implemented; then, under the condition of keeping the bending preload of the test-piece, seeking an appropriate indentation position by a high-precision automatic sliding table; and finally, controlling a precision piezoelectric driving platform to complete a bending preload indentation test, wherein in the test process, the test is subjected to real-time monitoring by a complete control system, and loads / displacements and motor signals are acquired and processed, so that corresponding mechanical property curves are generated. The invention provides a new testing method for the mechanical behaviors of materials under the action of composed loads.

Description

technical field [0001] The invention relates to the field of in-situ mechanical property testing, in particular to a bending preload micro-nano indentation mechanical property testing device and a testing method. The device integrates two parts, the bending loading unit and the micro-nano indentation loading unit, and can perform the micro-nano indentation composite test under the bending preload mode. Online real-time monitoring of the microscopic deformation, damage and fracture process under bending, indentation or the combined action of the two loads provides a new testing method for revealing the microscopic deformation behavior and damage mechanism of materials. Background technique [0002] In the field of material performance testing, with the innovation of new technologies in material science and the development of precision and ultra-precision processing technology, the inspection and even observation of the mechanical properties of materials at the micro / nano scal...

AI Technical Summary

Problems solved by technology

Traditional material mechanics testing methods have been developed very maturely in the past few years, but they are no longer able to meet the growing new technologies. The introduction of in-situ mechanical testing technology makes a breakthrough in the study of the relationship between the microscopic deformation damage mechanism of materials and the load action. sex becomes reality

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