Long-time creep fixture

Abstract

The invention provides a long-time creep fixture, comprising a cylindrical fixture body and two arc-segment-like seat covers with a same structure, wherein the cylindrical fixture body is connected with a tester and bears tensile load from the tester, two radial sides of the fixture body are respectively provided with a column (1) which has an arc-segment-like outer side surface, the inner side surface of each of the columns (1) is a plane perpendicular to the radial direction, the upper ends of the columns (1) are connected with the upper cover (2) of the fixture body so as to form an integral body, the upper part of the upper cover (2) is a solid cylinder (3) connected with the tester, the lower ends of the columns (1) are connected with a circular ring body (4) located at the bottom of the fixture body so as to form an integral body, each of the two arc-segment-like seat covers comprises a larger-diameter arc upper edge (5) and a smaller-diameter arc lower edge (6), and the arc upper edge (5) and the arc lower edge (6) are stagger and are connected through an arc cylinder, which enables the longitudinal section of the seat cover to form a zigzag shape. The long-time creep fixture prevents adhesion between the fixture and a specimen, realizes uniform loading and helps to reduce cost of testing.

Description

technical field [0001] The invention is a durable creep fixture, which belongs to the technical field of mechanical performance testing. Background technique [0002] As we all know, durability and creep are used to describe the performance of materials to withstand constant load for a long time under high temperature conditions. In order to obtain the durability and creep strength of the material, the material should be processed into a durability and creep specimen and loaded into a durability and creep testing machine for durability and creep testing. Endurance and creep testing machines are generally equipped with clamps for securing the specimens to the testing machine. [0003] Between conventional permanent and creep specimens and fixtures, threaded connections are usually used to evenly transfer the applied load to the working section of the specimen through the threads. However, there is a problem of high temperature bonding in this threaded connection. That is, ...

AI Technical Summary

Problems solved by technology

This shoulder connection method has the problem of uneven force

The inhomogeneity of the force leads to the imbalance of the loading coaxiality, which leads to a large difference in the measurement count of the extensometer and deviates from the actual deformation of the sample

This uneven force causes uneven deformation of the fixture after a certain period of testing, and thus aggravates the uneven force of the sample in subsequent tests

In addition, the fixture replacement caused by the deformation of the fixture also increases the test cost

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