Research On Fatigue Failure And Structural Optimization Design Of Non-Pneumatic Wheels With Mesh Flexible Spoke

In response to the high-risk structural defect of pneumatic tire puncture,major tire companies and scholars began to focus on the design of non-pneumatic tires that abandoned compressed air.The deformable support of non-pneumatic tires supports the mass of the vehicle and provides cushioning,but there is a phenomenon of stress concentration,and under the action of alternating stress,fatigue damage is easy to occur.This article focuses on the fatigue failure of non-pneumatic tires,from four aspects of tire static mechanical characteristics analysis,fatigue life analysis,structural parameters on tire performance analysis and structural optimization design.The specific contents are as follows:(1)Following the structure characteristics of spider web,benchmarking the structural size of 195 / 50R16 pneumatic tires,a mesh-like flexible spoke type non-inflatable wheel is proposed.Establish a three-dimensional geometric model and numerical simulation model of mesh flexible spoke non-inflatable wheels,and analyze the static load-bearing characteristics to explore the stress,strain,strain energy density,ground stress distribution and changes of mesh flexible spoke non-inflatable wheels law.(2)Based on the crack propagation theory,the fatigue life of the mesh flexible spoke type non-pneumatic wheels is predicted.Strain energy density is used as the evaluation index to determine the fatigue failure position of the mesh flexible spoke type non-inflatable wheels;based on the global-local model technology,the crack model is constructed;the channel integral of the crack tip is solved,and the fatigue characterization parameters of the wheels are further obtained—Energy release rate;based on the fatigue formula of the Thomas crack growth model,the fatigue life of the mesh flexible spoke type non-pneumatic wheel is calculated and obtained.(3)According to the structural characteristics of the mesh flexible spoke type non-inflatable wheels,the main structural parameters that affect the performance of the wheels are selected-the curvature of the side spoke plates,the number of side spoke plates,the thickness of the side spoke plates and the thickness of the tread,in order to carry capacity and fatigue The life and the uniformity of the ground pressure distribution are the influencing targets.The quantitative analysis of the influence of various structural parameters on the performance of the mesh flexible spoke type non-inflatable wheels.(4)Based on the orthogonal test method,the structural optimization of the mesh flexible spoke type non-pneumatic wheels is carried out.Based on the influence ofstructural parameters on the performance of mesh flexible spoke non-inflatable wheels,a four-factor three-level orthogonal test was established.The optimization goal of carrying capacity,fatigue life and uniformity of grounding stress distribution was to conduct mesh flexible spoke non-inflatable Multi-objective structural optimization design of wheels.The results show that the optimal horizontal combination is the curvature of the side spokes1/25;the number of side spokes 42;the thickness of the side spokes 3.5mm;the thickness of the tread 22 mm.