Test clamp suitable for high-temperature lasting creep deformation of plate-like test sample

Abstract

The invention belongs to the technical field of mechanical performance test, and relates to a test clamp suitable for high-temperature lasting creep deformation of a plate-like test sample. The clamp comprises two portions, namely, a clamp main body and a cushion block assembly, wherein the clamp main body is a cuboid shaped like the Chinese character Hui, a cavity is formed in the clamp main body, the cushion block assembly is divided into two elements, and longitudinal axes of the clamp main body, the cushion block assembly and the plate-like test sample stay on a same straight line; and the plate-like test sample is installed and clamped, a parallel section of the plate-like test sample is arranged between the two elements and fixed together by virtue of bolts, and then the test sample is integrally placed into the cavity of the clamp main body. The test sample and the clamp are connected in a clamping end suspension manner, so that the defect that a clamped end of the test sample is broken due to the pin connection can be overcome, the test failure probability is reduced, and the problems such as data inaccuracy, resource waste and the like can be avoided. The structure of the test sample is not only suitable for the high-temperature lasting and creep deformation of the plate-like test sample, but also suitable for testing mechanical performances of the plate-like test sample such as single-shaft tensile at a room temperature and high temperature, tensile fatigue and the like.

Description

technical field [0001] The invention belongs to the mechanical performance testing technology, and relates to a fixture suitable for high-temperature and long-lasting creep tests of plate samples. Background technique [0002] Endurance and creep are terms used to describe the performance of metallic materials when subjected to constant loads for long periods of time at elevated temperatures. In order to obtain the durability and creep performance of the material, it is necessary to process the material into a durability and creep specimen, and then use a durability and creep testing machine for testing. When carrying out endurance and creep tests, corresponding fixtures are required to fix the samples. [0003] At present, the common durability and creep samples are cylindrical samples and plate samples. Cylindrical samples are mainly used for durability and creep tests when the material is sufficient and there is no requirement for the size of the sample. The sample and t...

AI Technical Summary

Problems solved by technology

When this connection method is used for durability and creep tests, the following problems are likely to occur: (1) during the test, the load-bearing side of the round hole at the clamping end of the sample is easily broken; (2) the strength of the pin and the strength of the connected sample The diameter requirement is high, otherwise the pin is easy to break, and this situation is more obvious at higher test temperatures; (3) The pin is prone to deformation after long-term use, which affects the test coaxiality and sample clamping, making the performance data Reliability is reduced; (4) When the plate sample is thin, the gap between the sample and the U-shaped fixture is large, and the coaxiality is difficult to guarantee during the test, which affects the test results; (5) The test results are affected; There is a minimum requirement for the size of the clamping end, which makes it impossible to test small-sized samples

The existence of these problems increases the probability of test failure, reduces the reliability of data, and increases the cost of the test, especially for long-life and creep tests, which will cause a serious waste of test time and resources

Images