Similarity Analysis Of Wind-sand Erosion Damage Of Engineering Materials In Actual And Simulated Conditions

Dust weather frequently occurs in the central and western regions of Inner Mongolia,and many buildings,structures and roads are equally distributed near or within the desert area.With the increase of the service time of the buildings in this area,the erosion and damage of the building materials caused by the sandstorm environment becomes more and more obvious.In order to realize the mutual conversion of engineering materials in the actual working conditions and the simulated working conditions,this paper analyzes the similarity relationship between the influencing factors of the phenomenon of sand erosion in the two working conditions,and puts forward the similarity criterion of the wind-sand tests.In addition,the similarity criterion of wind-blown wind-sand tests is applied in practice,and the damage prediction of steel structure coating materials,concrete materials and glass materials in actual wind-blown sand environment is completed,which verifies the applicability of this criterion in guiding laboratory simulation of wind-sand testsThis project is funded by the National Natural Science Foundation of China(approval number : 11162011,51468049,11662012,11862022),the Natural Science Foundation of Inner Mongolia Autonomous Region(approval number : 2018MS05047),the Inner Mongolia University Youth Science and Technology Talents Support Program(approval number : NJYT-17-A09)and the Open Fund Project(approval number :FKLTFM1907).Specific research contents are :1.By collating and analyzing the meteorological data of dust weather in the middle and western part of Inner Mongolia,the dust concentration and erosion wind speed in the actual working conditions in this region are selected,the temporal and spatial distribution of dust weather in this region is obtained,and the annual average erosion time of dust storm in this region is calculated.The obtained environmental parameters in actual working conditions provide a data basis for analyzing and simulating the results of aeolian wind-sand tests and predicting the damage degree of materials in actual aeolian sand environment.2.Based on the theory of deformation and wear and the similarity theory,the similarity relationship between the factors influencing the aeolian sand erosion phenomenon in the laboratory simulation condition and the actual condition is analyzed,and the similarity criterion of aeolian wind-sand tests is put forward.This criterion restricts the numerical relationship between the parameters of aeolian sand environment in the actual working condition and the laboratory simulation working condition.Erosion velocity,sand concentration,erosion time and erosion loss are taken as the test adjustment parameters.By adjusting their values,the purpose of accelerating the test is achieved.The similarity criterion of aeolian wind-sand tests provides a theoretical basis and a basis for parameter selection for evaluating erosion damage of engineering materials under aeolian sand environment by using simulation test method.3.According to the proposed similarity criterion and the actual environmental parameters under the condition of wind-sand tests,analysis of concrete and the ordinary glass sand simulation test data of two materials,so as to get the actual wind environment in Inner Mongolia Midwest erosion damage time-varying curve and corresponding equivalent of damage photos,and predict the damage degree of two kinds of materials;Three groups of laboratory simulation wind-sand tests with different test parameters were designed to jointly simulate the sand erosion of steel structure coating under the actual environment in central and western Inner Mongolia.The time-varying curves of erosion damage of three groups of steel structure coatings were obtained through the experimental data of damage prediction erosion simulation wind-sand tests,and the service life of steel structure coatings was preliminarily predicted.Life prediction simulation wind-sand tests was carried out,according to the thickness of the specimens and the cumulative erosion loss to modify the test data,and the test data of two revised reliability analysis,get the survival probability of three groups of specimens in the whole life cycle curve,predict the steel structure coating to ensure the service life of the reliability of 95%.According to the theory of relative information of wind-sand tests data analysis,get the second and third set of test data in the specimen of the whole life cycle information entropy,relative information,effect coefficient and the degree of utility,comprehensive and quantitative to compare the accuracy of the two methods of testing,and assessing the effectiveness of the two groups accelerating test data.