新型聚氨酯弹性体注浆材料的压缩尺寸效应及应变率效应

doi:10.11896/cldb.22020115

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Abstract In order to solve the problems of low strength, weak anti-deformation ability and poor injectivity of existing grouting reinforcement materials for wind power foundation, a new polyurethane elastomer grouting material was prepared. Considering the size effect and strain rate effect, the uniaxial compression test was carried out, the compressive stress-strain relationship curve was obtained, and a four-parameter phenomenological constitutive model suitable for the polyurethane elastomer grouting material was proposed. The results show that the stress-strain relationship can be divided into three stages:elastic stage, yield stage and strain-softening stage before the material reaches the ultimate failure stage. The elastic modulus, compressive strength, softening stress, energy density and other mechanical parameters of the material increase with the increase of strain rate, and decrease first and then increase with the increase of specimen size, and the strain rate effect is more significant than the size effect. In addition, the four-parameter phenomenological constitutive model proposed in this work can accurately characterize the stress-strain relationship of the material. The constitutive model provides an important scientific basis for theoretical calculation and engineering application of the polyurethane elastomer grouting material.

Key words： polyurethane elastomer grouting material compression performance strain rate size effect constitutive model

Published: 10 August 2023 Online: 2023-08-07

CLC number:

TU502.6

Fund:National Natural Science Foundation of China (51978630,52178368,51909242), the China Postdoctoral Science Foundation(2021T140619, 2021M692939), the Scientific and Technological Research Program of Henan Province (212102310280) and the Postdoctoral Research Project Start-up Grant in Henan Province(202001016).

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	Articles by authors
	PAN Wang
	XIA Yangyang
	ZHANG Chao
	FANG Hongyuan
	WANG Fuming

Cite this article:

PAN Wang,XIA Yangyang,ZHANG Chao, et al. Compression Size Effect and Strain Rate Effect of a New Polyurethane Elastomer Grouting Material[J]. Materials Reports, 2023, 37(15): 22020115-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22020115 OR http://www.mater-rep.com/EN/Y2023/V37/I15/22020115

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