Research On Strength Reliability Of The Overloaded Wagon Body

With the rapid development of national economy, currently the railway transport capacity of our country has been completely unable to adapt to the development needs of the national economy. Therefore, development of fast and overload transportation is the the most effective way to solve the lack of capacity in our country. However, the increase of load and speed make the vehicle running work environment more bad, so that some of the key welding structure happen often fatigue and fracture and endanger safety. On the basis of studying the development of the overloaded wagon, using the easy-to-digest research strategy and an wagon as the research object, carried out a series of in-depth study, from the static strength analysis, nonlinear calculation of contact to the body weld fatigue life prediction aspects. To sum up, this paper studies are:Firstly, three-dimensional finite element model of overloaded wagon was established. According to the TB1335-1996"the strength design and test appraisal regulations for railway cars" and loading on the body, static strength of the four conditions are calculated, the result of whice shows that the strength of the car body meet the design requirements. Select the key test points on the wagon body under the vertical load and longitudinal extrude load conditions according to the test date, and then compare the finite element static strength calculation results and experimental results, to validate the reliability of the finite element model and the results of the analysis.Secondly, the nonlinear finite model was made in the bodywork traction beam and feeder structures, including the rivet. And the contact nonlinear computation analysis of the preload condition, coupler longitudinal tensile and compression was obtained, then compared to the calculations of the linear, non-linear and the test results, the results showed that local fine modeling nonlinear contact calculation and analysis were greatly closer to the actual situation of the vehicle running.Finally, Selecting the center plate, coupler tensile, compression, torsion and bearing load spectrum in AAR maintenance standard, the structural stress analysis of the overloaded wagon body weld was made by using the master S-N curve method of the ASME standard. And the fatigue life prediction also was done. The weld did not satisfy the years required of fatigue life, so its structure was improved. Weld structure life improved after improvement. to meet the requirements of fatigue life, enhance the ability of resisting fatigue.This subject get the support of the National863project (2012AA040912) and the key topics of Railways (2011J014-B)...