The numerical modeling and modal analysis had been investigated on vibration of magnesium alloy honeycomb panels. With a simplified model of honeycomb panel, imposing the boundary and initial conditions, the distribution of the natural frequency and inherent vibration mode of the honeycomb sample could be simulated by using Lanczos method, the summit amplitudes and the most dangerous points are found. The effective factors such as materials modulus, the density as well as the assembling all contribute to the analyzed results. The vibration modes and the basic vibration frequencies were analyzed. According to the analysis, the risk-reduction program is proposed.
Firstly, surface deformation strengthening technology on steel was discussed, then, ultrasonic impact treatment (UIT), a newly-developed surface deformation strengthening technology, was elaborated. Finally, the surface of normalized LZ50 steel was treated by ultrasonic impact treatment (UIT) to verify the value of the technology. After UIT, a 130μm-thick hardened layer is produced and surface hardness is improved by 46%. Meanwhile, the compressive residual stress of the sample can reach 601Mpa and surface roughness is dramatically reduced to 0.21μm. All of the results are beneficial for the improvement of fatigue properties of steel.
The paper presents the experimental studies on the enhanced comprehensive properties of Cr4Mo4V bearing steel using ultrasonic surface rolling process. Considerable improvements in mechanical properties and rolling contact fatigue performance are achieved in the present study, accompanied by the characterization of surface microstructures. The ultrasonic surface rolling process promotes the formation of fine nanocrystalline structures and nano‐sized elongated grains with severe deformation, leading to the increasing residual stress, micro‐hardness and high temperatures hardness. The crack propagation and delamination pit in the surface after ultrasonic surface rolling process is inhibited, further enhancing the rolling contact fatigue life of Cr4Mo4V bearing steel.
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