A method for testing and evaluating the mechanical properties of engineering materials against temperature changes

Abstract

The invention provides a testing and evaluating method for the mechanical property of an engineering material for resisting temperature variation. According to the testing and evaluating method, on one hand, the deformation characteristic of the engineering material under the high-temperature and low-temperature reciprocating change condition is evaluated by a two-end unconstrained temperature stress test A; on the other hand, the capability of the engineering material of resisting temperature stress under the high-temperature and low-temperature reciprocating change condition is evaluated by a two-end constrained temperature stress test B. According to the method provided by the invention, mechanical response of the engineering material under the action of a circulating temperature stress action can be effectively tested, mechanical behavior of the engineering material is learned, and mechanical characteristics of the engineering material are disclosed, therefore, the capabilities of the engineering materials for resisting the circulating temperature stress action and the deformation action are evaluated, and a rule that the mechanical properties of the engineering material are affected due to temperature change under a complex service environment is known more clearly.

Description

technical field [0001] The invention relates to engineering material detection technology, in particular to a mechanical performance test and evaluation method of engineering material resistance to temperature changes. Background technique [0002] Due to temperature changes, the stress generated in engineering materials is called temperature stress. In the design of various engineering materials and structures, temperature stress problems are encountered. In actual engineering, most engineering structures are in a natural environment with alternating temperature changes, and the influence of temperature stress is unavoidable. Temperature stress is an important load for these engineering materials and structures, and sometimes even becomes a key factor leading to material damage and structural failure. Therefore, for most engineering materials and structures, it is necessary to analyze and evaluate their deformation characteristics and thermal stress resistance performance ...

AI Technical Summary

Problems solved by technology

[0003] At present, the evaluation method of the mechanical properties of engineering materials against temperature changes is mainly based on the ultimate tensile strength of the specimen at low temperature (generally, the force required to be provided when the specimen breaks at a certain constant temperature is tested by a temperature stress testing machine) to evaluate the material. Resistance to temperature stress without considering the effects of temperature cycling on the accumulation of damage to the material

[0004] In December 2010, the Chinese journal "Journal of Transportation Engineering and Informatics" published a document titled "Viscoelastic Response of Asphalt Concrete Pavement Under Periodic Changes in Environmental Temperature". The law of change, which is mainly calculated and analyzed by finite element method, is the temperature field and temperature stress field generated by asphalt concrete pavement under the condition of environmental temperature cycle change. The stress is simulated by software, not actually measured, and the obtained The stress field is mainly used to reflect the stress conditions at different depths of the pavement. The stress field is the result of the comprehensive influence of the structure, thickness and temperature of the entire pavement, and cannot reflect the performance of the material itself against temperature stress.

Images