Low-cost indenter indenter soft landing method and system based on compound deceleration algorithm

Abstract

The invention relates to a low-cost indenter indenter soft landing method and system based on a compound deceleration algorithm. By determining the distance to be moved by the stepper motor; obtaining the measurement error; according to the distance to be moved by the stepper motor and the measurement error, determine the distance the stepper motor moves in the high-speed stage; drive the stepper motor to uniformly accelerate and increase to the highest speed. A period of uniform motion, and then a period of uniform deceleration motion to reach the initial speed of the low-speed stage, until the indenter moves to the distance that the stepper motor moves in the high-speed stage; drive the stepper motor to gradually decelerate to a fixed speed through an arc-shaped deceleration algorithm, and then proceed to a uniform speed Motion; judge whether the force value is greater than the maximum dynamic error; if so, the stepper motor moves in the opposite direction at a smaller speed until the force value is less than or equal to the average dynamic error, and the stepper motor stops moving; if not, the stepper motor continues to move at a constant speed . The invention can reduce the soft landing process time and the influence on the indentation experimental data.

Description

technical field [0001] The invention relates to the field of soft landing of an indenter indenter, in particular to a low-cost indenter indenter soft landing method and system based on a compound deceleration algorithm. Background technique [0002] With the continuous development of various new materials and technologies, some of the disadvantages of traditional material testing methods have been exposed. / The premier choice for testing the mechanical properties of nanoscale materials and structures. The indentation experiment obtains parameters such as elastic modulus, hardness, stress-strain curve, fracture toughness, fatigue properties, creep properties, adhesion and other parameters by analyzing the curves. [0003] In the indentation experiment, there is a certain distance from the indenter to the surface of the sample to be tested in the initial stage, and it needs to be moved by the motor to reach the surface of the object, that is, the soft landing process of the ...

AI Technical Summary

Problems solved by technology

Most micro-nano indenters use a displacement sensor to detect the distance from the indenter to the sample, which not only increases the cost of the indenter, but also makes the entire structure more complicated. Even so, some instruments are soft due to various reasons. The landing process takes a long time, which makes the experiment time longer

In addition, the conventional soft landing process is to retreat after contact with the sample. Excessive contact force will cause damage to the surface of the sample, thus affecting the initial data of the indentation experiment.

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