A micro-resistance measuring fixture device for detecting metal material damage and its use method

Abstract

A micro-resistance measuring fixture device for detecting metal material damage and a use method thereof. The micro-resistance measurement fixture device used to detect metal material damage consists of two specimen fixing pieces for fixing metal specimens, two probes for measuring the resistance of metal specimens, and two probes for fixing probes Fixing piece, two screw rods for connecting the specimen fixing piece and the probe fixing piece in series, eight nuts (with washers) for fixing the specimen fixing piece and the probe fixing piece, two pieces for the test piece and the probe fixing piece It is composed of insulating spacers that are insulated between the fixed pieces of the test piece. A micro-resistance measuring fixture device for detecting metal material damage can fix the probe on the end of the test piece to ensure the stability of the resistance measurement reading, detect the slight change in the resistance of the metal test piece under the action of load or environment, and improve the accuracy of the measurement And accuracy, in order to use the resistance change to characterize the damage of the metal material. The invention is applicable to the field of micro-resistance and micro-resistance change measurement.

Description

technical field [0001] The invention relates to the technical field of micro-resistance and micro-resistance change measurement, in particular to a resistance measurement jig device that characterizes the damage evolution of metal materials by detecting micro-resistance changes, and introduces the use method of the resistance measurement jig device. Background technique [0002] Metal and its alloy materials are usually used as structural materials, and the components made of them need to bear various complex loads and environmental effects during service, so their mechanical properties are in a process of gradual deterioration. Material damage detection is not only the basis for structural integrity assessment, but also for the design of engineering machinery and structural damage tolerance. Therefore, for the measurement of graded loading damage of metal materials under various simple or complex loads (tension, compression, bending, torsion and their combined loading), esp...

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Problems solved by technology

However, this method of measuring resistance cannot guarantee that the probe is placed at the same position every time, and at the same time, when a person holds the probe, it will always shake or be disturbed by other external factors

The uncertainty of the position of the probe, the vibration of the probe at the measurement part of the test piece and the sliding on the surface of the test piece will lead to the instability of the resistance reading, the accuracy and precision of the resistance measurement are not high, and it is difficult to distinguish the load or the environment A small change in resistance under the action of

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