Research On Mechanical Properties And Design Method Of Aluminum Alloy Grid Structure Under Extreme Temperature

Aluminum alloy materials have been widely used in space structures due to their advantages of light weight,high strength,corrosion resistance,non-magnetic,low maintenance cost during use,and recycling.Especially in coastal areas,swimming pools,industrial plants,etc.The building in the environment.The aluminum alloy material is sensitive to high temperature,and the strength of the material is weakened after high temperature.The research on the fire resistance performance of the aluminum alloy joints at home and abroad is less.The domestic research on the fire resistance of the plate joints is mainly carried out in China.The research on the performance of high temperature is scarce;the research on the low temperature performance of aluminum alloy in China mainly focuses on the study of the properties of aluminum alloy materials at low temperature,the lack of material properties of 6061-T6 aluminum alloy for low temperature and the mechanical properties of aluminum alloy joints at low temperature.the study.Therefore,it is necessary to carry out research and experiments on the mechanical properties and design methods of aluminum alloy bolt ball joint grid structure under extreme temperature to guide the fire resistance design of aluminum alloy bolt ball joints and its design in low temperature and low temperature fields.application.In this paper,the mechanical properties of aluminum alloy bolt-ball joint grid structure under extreme temperature are studied,including:(1)Experimental study and finite element analysis of bolting joints of aluminum alloy bolt ball joints under high temperature,and aluminum at high temperature The failure mode and tensile performance of the bolt-joint bolt connection of the alloy bolts are proposed,and the design method of the bolt connection of the bolts of the aluminum alloy bolts at high temperature is proposed.(2)Combined with the tensile test and finite element analysis of the joints of aluminum alloy bolted ball joints at high temperature,the failure mode and tensile properties of the joints of aluminum alloy bolt ball joints at high temperature are obtained,and aluminum is proposed at high temperature.Alloy bolt ball joint sealing plate connection tensile design method.(3)By testing the properties of 6061-T6 aluminum alloy under the temperature of-80 °C～20 °C,the mechanical properties such as elastic modulus,yield strength,ultimate strength,elongation and cross-section shrinkage were obtained with temperature.According to the test results,the bolting and sealing connection model of aluminum alloy bolt ball joints at low temperature is established.The mechanical properties and design method of aluminum alloy bolt ball joints at low temperature are obtained.(4)Based on the study of mechanical properties of aluminum alloy bolt ball joints at high temperature,the numerical simulation analysis of the fire resistance performance of aluminum alloy bolt ball joint grid structure is carried out,and its mechanical properties and fire resistance time are obtained.Application and anti-fire design provide a theoretical basis.