| Today, concrete mixer truck not only has great market demands but also has very wellpotential market. So improve the product quality and reduce the product developing costhas become an inevitable choice to hold on a dominant and win the competition formanufacturing enterprise.As an important component of concrete mixer truck, the sub-frame in addition tostood structure static load also bore dynamic load under vibration and impact whendriving on uneven rough road surface. The special force forms lead to the sub-framestructure generated cracks and fatigue failure very easily, so it is very important to studyon the fatigue property.With the development of computer technology and finite element analysis, fatiguelife analysis method has been widely used. In the designing stage of product, designersused this method to compare different schemes of the fatigue life analysis; can check thefatigue life of the product whether meet the design requirements, can also be foranti-fatigue design. Before product test, its fatigue dangerous position is determined.Based on the CAE technology, the fatigue life prediction under multi-axial loadingof13square concrete mixer’s sub-frame have been studied. In order to predict thefatigue life of frame structure, the method based on multi-body dynamics and finiteelement has been adopted. Established the finite element model of sub-frame and madestatics analysis in ANSYS, then obtained the change of stress and strain of sub-frameunder different working conditions. To determined the working condition offlexural-tensional and ultimate twisting for fatigue conditions.Made a research of the dynamic responding state existed in the vehicle on Brandom road surface, and extracted of leaf spring and frame connection load. Accordingto fatigue property data and fatigue damage model based on FE-Safe software andfound out the parts of stress concentration and fatigue failure, then got the result offatigue analysis. The results show that, the logarithmic fatigue life of sub-frame was5.4157, andthe minimum cycle life was260458.859. After these cycles, the fatigue crack s havebeen appeared. The position of fatigue damage appeared in the rear of longitudinalbeam, In conformity with the stress results in statics analysis. And the value of FOS was0.7063.The analysis results with the road test results show that, the method proposed caneffectively predict the fatigue of vehicle key components under the non-proportionalloadings at early design. |
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