Four-point bending fixture of thin plate for high stress loading and loading method thereof

Abstract

The invention discloses a four-point bending fixture of a thin plate for high stress loading and a loading method thereof. The fixture comprises a fixture body. The fixture body comprises a horizontalbottom plate, vertical side plates arranged on the two sides of the horizontal bottom plate and fixedly connected with the two sides of the horizontal bottom plate, and two top plates arranged at thetops of the vertical side plates on both sides and arranged to face each other; a horizontal bottom plate, two side vertical side plates and two top plates encloses a top-opened accommodating cavity,and the cross section of the accommodating cavity is in a rectangle shape; a loading block is arranged in the accommodating cavity and arranged in parallel with the horizontal bottom plate for carrying a thin plate sample, a loading force hole is arranged at the center of the bottom of the loading block, a loading screw is arranged at the center of the horizontal bottom plate, the top end of loading screw vertically penetrating through the horizontal bottom plate can be embedded in the loading force hole of the loading block to butt. The fixture of the invention can place the thin plate sample between the loading block and the two top plates, can effectively avoid problems of unstable loading of the thin plate sample or ejection of the sample and the like.

Description

technical field [0001] The invention relates to a stress loading fixture and a loading method thereof, in particular to a four-point bending fixture and a loading method thereof for high stress loading of a thin plate. Background technique [0002] Hydrogen-induced hysteresis cracking is a phenomenon in which materials undergo brittle failure suddenly after a certain period of time under the action of static stress, which is the result of the interaction between material-environment-stress. A large number of studies have confirmed that the hysteresis cracking of steel is caused by the hydrogen in the material and the service environment of the material, and it is a form of hydrogen-induced material deterioration, especially for ultra-high-strength steels with a strength greater than 1000MPa, which is more sensitive to hydrogen-induced hysteresis cracking. significantly. Hysteresis cracking often occurs suddenly when the applied stress level of the material is significantly ...

AI Technical Summary

Problems solved by technology

[0004] At present, stress corrosion in my country is mainly concentrated in the fields of pipelines, containers and energy. The materials targeted are mainly hot-rolled plates and medium-thick plate materials, and their strength levels generally do not exceed 1000MPa, and the deflection imposed on them is relatively low. Materials, especially ultra-high-strength thin plates with a strength greater than 1000MPa, require greater stress and greater deflection. The use of existing fixture devices often results in unstable sample holding or sample pop-up, resulting in failure to load

Images