Four-point bending fixture for L-shaped sample

Abstract

The invention relates to the technical field of material mechanical property testing devices, and especially relates to a four-point bending fixture for an L-shaped sample. The four-point bending fixture comprises two fixture parts and at least two loading stabilizing shafts; the two fixture parts are symmetrically arranged up and down; the loading stabilizing shafts are arranged in parallel; thetwo fixture parts are connected with each other by the at least two loading stabilizing shafts, and at least one fixture part can move along the axial direction of the loading stabilizing shafts, so as to adjust the distance between the two fixture parts; each fixture part comprises a transmission component and two supporting components; and the transmission component drives the two supporting components to move simultaneously in opposite directions. The four-point bending fixture for the L-shaped sample provided by the invention can assist the completion of the four-point bending fatigue testof the L-shaped sample, and can adjust the loading position with high precision and can assist the centering to reduce the deviation when the L-shaped sample is placed.

Description

technical field [0001] The invention relates to the technical field of testing devices for mechanical properties of materials, in particular to a four-point bending fixture for L-shaped samples. Background technique [0002] With the increasing application of composite materials in aerospace, more and more key structural parts use composite materials to ensure the overall structural rigidity of the aircraft, such as the center wing box (central wing box), the wings of the vertical or horizontal tailed planes (Vertical or horizontal wings of the prototype), these structures often contain complex geometric structures, and the L-shaped structure is more widely used to ensure the structural strength of the vertical joints, so a series of four points for the L-shaped sample Bend test standard. [0003] At present, most of the four-point bending fixtures are aimed at straight-line samples. For example, Chinese invention patent application CN104777033 A discloses a four-point bend...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the four-point bending fixtures are aimed at straight-line samples. For example, Chinese invention patent application CN104777033 A discloses a four-point bending fatigue test fixture for straight-line samples. It can be seen from the application that the L-shaped sample Unlike the structure of straight specimens, the four-point bending fatigue test fixture for straight specimens is difficult to apply to the four-point bending test of L-shaped specimens

Images