HUANG Qingxue
,
WANG Jianmei
,
MA Lifeng
,
ZHAO Chunjiang
钢铁研究学报(英文版)
With the rapid development of the steel industry, to keep pace with the current trend of high speed, continuous, and largescale production that focuses on automation and high levels of efficiency, many stateowned steel companies are being equipped with oil film bearings. Through longterm onspot inspection and research on the fatigue failure of oil film bearing, three segments of annulated fatigue breakage were found axially along the inner surface of the bearing sleeve. In order to elucidate the reason for the threesegment annulated damage under rolling load, numerical boundary element method was adopted to analyze the contact behaviors between the sleeve and rollneck. Failure mechanism was discussed in detail, the distributions of contact stress were analyzed, and the service lives of the sleeve for different positions on the inner surface were quantitatively described, which provided an effective means to decrease wear and adhesive damage of the sleeve and to increase the load capacity of oil film bearing and its service life as well.
关键词:
oil film bearing;fatigue failure analysis;contact problem;bearing life
LI Yugui
,
HUANG Qingxue
,
SHEN Guangxian
,
XIAO Hong
,
PANG Siqin
,
WANG Jianmei
钢铁研究学报(英文版)
With rollers as elastic bodies and workpieces as elastoplastic bodies, the rolling problem can be viewed as a friction elasticplastic contact problem. With fewer assumptions in the simulation of striprolling process, a boundary element method (BEM) for twodimensional elastoplastic finite strain and finite deformation analysis of contact problems with friction was presented. All the equations for contact problems, which include multinonlinearities, were obtained. Incremental and iterative procedures were used to find contact pressure and friction stress. Moreover, initial strain rate algorithm and workhardening material behavior can be assumed in the plastic analysis. Several examples were presented, and the results of contact pressure and friction stress were in excellent agreement with those of analysis.
关键词:
boundary element method;contact problem;elastoplastic finite deformation;rolling
ZHANG Fangping
,
SUN Binyu
,
WANG Jianmei
钢铁研究学报(英文版)
According to the theories for stretch reducing process and steel tube plastic deformation, the energy method was used to mesh the rolled deformation zone of the steel tube into the upper limit elements, and an admissible velocity field was constructed to deduce a series of formulas of the inner virtual power consumption of deformed bodies. The rolling force during the stretch reducing process could be obtained by optimizing the upper limit power, which could provide guidelines for a proper choice of the stretch reducing process and devices for steel tube companies, as well as new products and devices.
关键词:
upper limit power;rolling force;velocity field
