The Dynamics Analysis Of Wheel Loader And Residual Service Life Assessment Of Boom Remanufactured Recycling Parts

With the development of engineering machinery market is increasingly vigorous,the quantity of mechanical equipment and used products continue to grow,voluminous retired products will place huge pressure on ecological environment and enterprise revenue,hence engineering machinery manufacturers are more focused on the recycling and remanufacturing of used products to maximize its potential value and improve its recycling rate.The wheel loader is one of traditional engineering machinery equipments,and the boom is the main supporting parts of loaders’ working device,before manufacturers will carry on the recycling and remanufacturing of the boom,it’s important to assesse how much recyclable surplus value so as to make reasonable remanufacturing scheme,and the residual life of the recyclable boom is the key factor in its assessment result.Therefore,this article taken ZL50 loader as research object,based on the kinematics analysis of it we evaluated the residual life of the recyclable boom,thus helped manufacturers to quickly triaged the remanufacturing of used products.The content of this article is as following:First of all,The 3D modeling of the loader’s working device was accomplished in UG,and analysed various typical working conditions and forced conditions of the buckets.Based on the theory of multi-body dynamics,the model of working device for dynamic simulation analysis was built with ADAMS,and loading information related to the boom were obtained by simulation analysis.Secondly,the finite element model of the boom was established in Workbench,used the result of multi-body dynamics simulation as the loading condition in different time points,based on the transient dynamic analysis of it we got the stress results at each moment,from it we could determine the most dangerous position of the boom at which to drew the stress time history diagram.Then the modal analysis of the boom was accomplished to got the modal parameter for kinetic analysis and structure optimization.Then,on the one hand,based on the P-S-N curve of material and fatigue damage accumulation theory,and we chose nominal stress approach to calculated the fatigue life of the boom under different reliability.On the other hand,according to five-step fatigue analysis,it used a software n Code Design Life to simulated the fatigue life of the boom.In contrast of the result obtained from these two method,we could determine the total fatigue life of the boom and calculated the residual life of the recyclable boom without crack based on its served time.At last,the finite element model of crack propagation was established in the most dangerous area of the boom through the software Workbench,and solved the stress intensity factor in varying depth of initial cracks.After the function expression of the stress intensity factor and crack depth were obtained by numerical fitting the analysis results,we could calculate the crack growth life of the boom through the Paris formula,finally the functional relationship graphics between crack depth and residual life of the recyclable boom were plotted.