Study On Mechanical Properties Of Silicon Aluminum Alloy Under Complex Load

Silicon aluminum alloy has good thermal conductivity,high stiffness,light weight,corrosion resistance,wear resistance and many other excellent properties.It is widely used in aerospace,automobile and portable electronic devices.Due to the increasing demand for its performance in various engineering fields,its preparation method and heat treatment process have become the focus of international academic research in recent years.The mechanical properties of alloy products have been continuously improved.However,the material is usually used in complex load environment,and there is a lack of in-depth research on the mechanical properties of si-al alloy under complex load.In-depth research on the mechanical properties of silicon aluminum alloy under complex loads is of great significance to reveal its mechanical behavior and damage mechanism under actual service conditions,and relevant research will also provide basic data support for the research and development process improvement and quality control of such materials.On the basis of summarizing and analyzing the application of si-al alloy and the development status of complex load testing technology at home and abroad,this paper puts forward the mechanical testing method of si-al alloy under complex load and demonstrates the feasibility of mechanical properties testing of si-al alloy under complex load.By deducing the theoretical model of eccentric loading in three-point bending,the theoretical basis of error analysis of eccentric loading is established.Based on Weibull theory,the correlation between tensile strength and bending strength is established.Combined with the finite element simulation analysis,the design of ultrasonic fatigue sample of si-Al alloy under pretension-bending composite load was completed.In order to carry out the study of static stretch-bending composite test of silicon aluminum alloy,the error analysis of static and dynamic loading module was carried out,and the accuracy correction of stretch-bending test was theoretically completed by integrating displacement sensor.In view of the eccentric loading in the composite test of stretch-bending,different metal materials were selected to carry out the eccentric loading test of three-point bending.It was found that the eccentric loading had little influence on the test results,and the feasibility of static stretch-bending composite test was demonstrated.In order to explore the correlation between tensile strength and bending strength of si-al alloy,static tensile test and static three-point bending test were carried out in this paper to verify the accuracy of the theory.The mechanical properties of si-al alloy under tensile-bending composite load were investigated.The influence of pre-tensile load on the bending mechanical properties of si-al alloy specimens was analyzed through the bending test under pre-tensile load.The variation of bending property with pretensile load is obtained.In order to investigate the fatigue properties of si-al alloy under tensile-bending composite load.In this paper,ultrasonic fatigue tests of si-al alloy under pretension-bending composite load were carried out.The water cooling system is integrated on the complex static and dynamic loading test instrument,which solves the phenomenon of sharp temperature rise caused by high frequency vibration at the end of fixture during ultrasonic fatigue test.The fatigue properties of si-al alloy under pretension-bending composite load were investigated.