汽车车轮是整车系统的重要组成部分,而轮毂是车轮总成的关键部件,汽车轮毂设计的稳健性直接影响着整车性能.文章利用有限元法对汽车轮毂进行模态及刚度性能计算机辅助工程(CAE)仿真分析,使轮毂的模态及刚度性能满足整车目标体系要求,有效支持了汽车轮毂的工程设计开发,有利于降低整车振动和噪声,为良好的整车噪音、振动与声粗糙度(NVH)性能开发提供了保障.

汽车驻车拉索支架设计的合理性直接影响着零部件的正常功能使用,而其支架的模态及强度性能是否满足要求又起到了关键性作用.文章通过数值模拟分析方法,对驻车拉索支架进行模态及强度仿真分析,结合应力最大的薄弱区域进行了结构优化设计.对优化方案重新进行仿真分析,分析结果满足零件设计性能要求,有效地指导了工程方案的改进设计,为相关车型支架设计及仿真分析提供了宝贵经验.

采用有限元对汽车ECU支架进行频率响应CAE仿真分析,通过应力结果评估强度风险,并提供了优化方案,使支架最终方案满足强度性能要求,有效支持了支架的工程设计,为支架类零件的仿真分析提供了参考.

Slow train rate test （SSRT）, analysis of fracture surface of Q345R standard cylinder samples and corresponding arc sprayed samples were used to study the caustic embrittlement resistance of arc sprayed iron-based Ni-Cr coatings. The results show that arc sprayed iron-based Ni-Cr coating can be used as a protective coating for solving caustic embrittlement problems at relatively high temperatures.

16Mn-Steel was chosen for testing the corresponding fatigue cycle-index for notch crake with different sizes obtained through fatigue test for notch specimen.After regression,an estimation formula for crack initiation life was deduced.Then a simulation fatigue test is performed by using the samples with the same size as the real undercuts,as well as the simulating fatigue test under the stress range of the actual structure,which will be compared with the results obtained according to the S-N approach.As a result,the estimating life according to the formula approaches is close to the experimental life.Thus the results obtained through the S-N approach are conservative,which provide theoretical basis and experimental date for the life evaluation of pressure vessel.

The residual life of reforming furnace tubes was calculated by measuring and analyzing the tubes' chemical composition,microstructure,mechanical properties,mechanical behavior at high temperature and creep oupture performance.This made it possible to know the safe operation status of reforming furnace for hydrogen generation.Considering some safety factor,the residual life of the tubes was estimated 6 years.

There were some the axial surface defects with extremely small openings and the shape like crack on the oxygen pipeline in a company, and they all were difficult to be eliminated. In order to determine whether these defects could be safe, the fatigue test was carried out on 10 steel with real and artificial surface defects. According to the test result, the method by which a notch fatigue crack initiation cycles was estimated, was proposed and the safety analysis of 10 steel was done. The results show that the 10 steel could be safe in the existing conditions. The steel has been used for more than 10 years, so it proves that the evaluation result is correct and safe.

As the development of software and hardware of computer,finite element analysis has a wide application.It adopt finite element analysis to the engine bracket.The theory of simulation analysis and the process of the building of the finite element model are introduced,and the static analysis is made to engine bracket with UG software.As the result indicate: the engine bracket can meet the require of strength,and supply a principle for engineering design.

As a new type sheet metal,tailor rolling blanks have forming defects,such as wrinkling,broken and the movement of the transition zone.The defects can be eliminated or reduced and formability can be improved by reasonable control mode of the BHF.The drawing depth,the movement of the transition zone,the strain path etc.of TRB with constant or variational BHF of one-piece holder were studied by the finite-element software ABAQUS.The numerical simulation result indicates that forming depth can be increased by 12.5%,and the movement of the bottom box center and ultimate strain can be reduced by comparing increasing BHF with constant BHF.

Numerical simulation was made on parameters like thickness ratio of sheet metals,its shapes and dimensions,blank holder force and die radius that affect the formation of square box made of tailor rolled blanks.Through orthogonal experiments,the forming depth and movement amounts of transition zone on different conditions were contrasted and analyzed.The strain path of dangerous points was adjusted and an optimized scheme was determined to improve the formability of tailor rolled blanks.

By the numerical simulation and experiments,the process analysis of draw-bending and draw-trimming of the tailor-welded blanks (TWBs) with the thickness ratio 1.2 mm/0.8 mm are made,in which the effect of the blank holder force (BHF), friction factor and die profile radius,etc.on the springback are mainly investigated.The TWBs' springhack angle in the corner of punch and die,the total springhack angle and the sidewall curvature are surveyed in draw-bending and draw-trimming.And the welded line movement,the stress distribution in TWBs forming and their interact relationship are analyzed.The TWBs' springback in draw-bending and draw-trimming are badly influenced by the BHF,friction factor,die profile radius etc.,in which the BHF is the key factor;there is an intimate relationship between TWBs' draw-bending springback/draw-trimming springhack and welded-line movement,by which it will be advantageous to reduce the TWBs' springback through controlling the welded-line movement.In comparison,the TWBs' draw-trimming springhack is smaller than the TWBs' draw-bending springback,so it is better to use draw-trimming process for controlling TWBs' springback and improving the shape precision of TWBs' forming.

Through the effective combination of numerical simulation and optimization orthogonal,some researches have done on these factors,such as thick ratio of TWB,corner radius of die,the size and shape of TWB and so on,which influences the forming of TWB square-box.And finally,they enhance the forming depth and reduce the weld line movement through the numerical simulation.The experiment of stamping shows that the orthogonal design is Effective and feasible to the forming parameter optimization of TWB square-box.