Indentation testing device and testing method

Abstract

The invention provides a novel high-flux wide-temperature-range indentation testing device and testing method capable of measuring various mechanical properties (including elasticity modulus, yield strength, tensile strength, creep property and the like) of a material. The device can directly determine a contact zero of a pressure head and a test specimen through a fine tuning way, simultaneouslycan provide a temperature environment of 253DEG below zero to 1000DEG C, and can simultaneously carry out multiple groups of indentation tests under the same temperature environment. The device comprises a base, a sample platform, a force application system, a distance regulation system, a feedback control system, a measurement system, a temperature control system and / or a thermal insulation system. By use of the device, the problem that an existing indentation testing device can not directly determine the contact zero of the pressure head and the test specimen, meanwhile, the problem that anexisting device can not simultaneously carry out multiple groups of indentation tests under the same temperature environment is also solved, the device and the method capable of testing a plurality of same test specimens or the test specimens of different sizes under one working condition are provided, and wide-temperature-range indentation testing is realized through the conversion of a temperature environmental box.

Description

technical field [0001] The invention relates to an indentation test device and an indentation test method, in particular to a high-throughput wide-temperature range indentation test device for testing macroscopic mechanical properties, which can be used for rapid screening of mechanical properties of materials, and belongs to the mechanical properties of materials with minimal damage test field. Background technique [0002] In important industrial fields related to the national economy and the people's livelihood, such as energy, chemical industry, transportation and detection, the service environment of related equipment is developing towards more extreme temperatures. Commonly used high / low temperature metal materials can no longer meet the needs of modern industrial development, and new advanced structural materials need to be developed to meet the higher requirements for the mechanical properties of materials in the industrial field. [0003] The "Materials Genome Proj...

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Problems solved by technology

Through research, it is found that the existing macro-indentation devices at home and abroad are all within a single temperature range, normal temperature, low temperature or high temperature (Zhang T, Wang S, Wang W. et al. Results in Physics, 2018, 8: 716- 727; Qu Z, Yu M, LiuY, et al. Rev Sci Instrum, 2017, 88(4): 045102; Wei Zhongkun, et al., Mechanical Engineering Materials, 2016, 40(1): 32-34), no simultaneous integration High and low temperature indentation devices have been developed to characterize the mechanical properties of various materials at different temperatures; at the same time, the current indentation devices are all single indenters, and only one sample can be made in one experiment, especially in high / low temperature Low-temperature indentation test, the heating / cooling time period is long, and only one sample can be made at a time, which will lead to long time consumption, low efficiency, and high test cost, which cannot meet the urgent requirements of quickly testing the mechanical properties of new structural materials and shortening the research and development cycle; finally, The contact zero point of existing indentation test devices is mostly determined by preloading, and then indirectly and roughly estimated by curve fitting and extrapolation methods or by measuring the first increase in test force or contact stiffness This traditional indirect method cannot directly and accurately determine the zero point of contact between the indenter and the sample before the experiment, resulting in a deviation between the measured value of the displacement and the actual value, which affects the test results the accuracy of

[0006] In view of the problems that existing indentation equipment cannot directly determine the contact zero point, the measurement efficiency is low, and the measurement in a wide temperature range cannot be realized, there is an urgent need in this field to develop a method that can directly determine the contact zero point and can measure material mechanics in a wide temperature range. High-throughput indentation testing device for performance

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