Micro-punching-shear testing device and method for micro-area mechanical property of welding joint

Abstract

The invention provides a micro-punching-shear testing device for the micro-area mechanical property of a welding joint. The device comprises a base and four guide posts connected to the base. The guide columns are sleeved with a punching disc, a guiding disc and an upper disc from bottom to top. The punching disc is a disc provided with a boss and a center hole. The lower plane of the punching disc is provided with a conical hole. The upper plane of the punching disc is provided with a radial groove and two pressing pieces. The guiding disc is provided with a center hole for allowing a punch bar to be inserted therein in a penetrating mode. Two notches are symmetrically formed in the outer circumference of the guiding disc. The upper disc is provided with a center hole and notches corresponding to the guiding disc and a counter bore coaxial with the center hole. The punch bar is a cylinder, wherein the upper end of the punch bar is provided with a flange, the lower end of the punch bar is provided with a center blind hole, and the middle of the punch bar is provided with a radial through hole. A frame bar penetrates into the through hole, and the two ends of the frame bar are provided with displacement sensors, wherein the lower ends of the displacement sensors penetrate through the notches of the guiding disc to be connected with the punching disc, and the lower ends of the displacement sensors stretch into the notches of the upper disc. A force sensor is arranged on the end face of the flange of the punch bar. The displacement sensors and the force sensor are connected with a data acquisition system through wires. The invention further discloses a micro-punching-shear testing method.

Description

technical field [0001] The invention belongs to the technical field of micro-area mechanical property testing of welded joints, and in particular relates to a testing device and a testing method for testing micro-area mechanical properties of welded joints by micro-punching and shearing. Background technique [0002] Welded joints are a kind of heterogeneous material with non-uniform structure and mechanical properties, so the accurate evaluation of the mechanical properties of welded joints has been widely concerned at home and abroad. For the detection of the performance of welded joints, the traditional methods are mechanical performance test methods (such as tensile test, impact test and bending test, etc.) and fracture mechanics test methods. The specific performance, especially for the tiny heat-affected zone, is difficult to detect. [0003] At present, the test methods for the mechanical properties of the micro-area of ​​welded joints mainly include: [0004] 1) Mi...

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However, this method is rarely used in the performance...

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