| Citation: | PANG C，LIU D J，TIAN G，et al. Experimental and simulation study on fatigue multi crack fusion of 2195-T8 Al-Li alloy[J]. Journal of Beijing University of Aeronautics and Astronautics，2024，50（1）：350-358 （in Chinese） doi: 10.13700/j.bh.1001-5965.2022.0249
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As an alloy material widely used in aerospace, the study of fatigue fracture behavior of aluminum-lithium alloy is of great significance to the evaluation of structural safety. The third generation Al-Li alloy 2195-T8 is taken as the research object, and the fatigue crack propagation behavior of 2195-T8 Al-Li alloy is tested and simulated by constant amplitude tensile fatigue test and finite element method. Based on the microscopic measurement and observation of the cross-section, multiple initial cracks were introduced into the simulation model, and then the fusion and propagation process of multiple cracks was simulated. The results show that before crack fusion, under the action of fatigue cyclic load, the value of stress intensity factor at the crack tip increases continuously, and the volume of the plastic region increases gradually; when the cracks fuse with each other, the stress intensity factor at the crack surface increases instantaneously, the stress intensity facto is much higher than the value of the rest of the crack tip. With the further fusion of the crack, the value of the stress intensity factor at the tip tends to be stable; after the crack is completely fused, it reaches the stage of rapid crack expansion, the volume of the plastic region increases in direct proportion to the expansion step, and the growth rate is first fast, then slow; finally, the crack surfaces meet and merge into a new elliptical shape crack surface.
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