Study On Mechanical Experiments For Structure Of A Bicycle Rim

Nowadays most of the experiment objects are some specimens and simple structures in mechanical experiment courses. There is a lack of experiments on hyperstatic system supported by many rods. The bicycle rim is one of the most important parts of daily-used bicycle. It can be described as a static undetermined structure supported by many rods in mechanical model. Therefore, this thesis does some research on the mechanical experiment of bicycle rim.This thesis aims at opening one mechanics experiment course of bicycle rim for undergraduate students. Firstly, a reasonable experiment project of bicycle rim is designed. Secondly, analysis of a complexity structure-statically indeterminate model is presented for the rim and the stress and strain of actual bicycle rim is tested and measured using the experimental stress analysis method. Thirdly, the mechanical characteristics of the structures are educed by comparing the experimental results with the finite element results. The effects on accuracy of the experiment results are also discussed. Therefore, the feasibility of this experiment is validated. The main contents and conclusions of this thesis are listed as follows:1) A general review on the current research situation of bicycle rim is presented. The scheme and the principle of experiment on bicycle rim with experimental stress analysis method are introduced.2) The mechanical model of bicycle rim is established, which is a closed circle rod structure supported by many prestressed rods. The theoretical results which are calculated with mechanics of material method and finite element method of bicycle rim structure are given.3) The mechanics experiment platform of bicycle rim is established. The strain and displacement of bicycle rim are measured when the spoke are prestressed and un prestressed. 4) The theoretical results and experimental results are compared with each other, and the results show that they agree well with each other, which invalidates the feasibility of the experiment platform and experiment scheme. It also shows that the mechanics model and research method is correct.5) The source of the experiment errors is analyzed, and the scheme to reduce the errors and increase the accuracy is put forward.All the work that this thesis has done can offer theoretical and experimental guides for realization a new item in mechanic experiment course.