Temperature of the head, the waist, the bottom and angle of the bottom of same heavy rail lying on the cooling bed is tested continuously, time interval is 5min, which can provide the basis for prebending process. Additionally, the U75V 60Kg/m heavy rail straightening processes using the horizontal and edge roll compound straightening machine is discussed in this paper, and contrasts the cross-section dimension and straightness of heavy rail before and after being straightened, which is important to make certain of optimum straightening parameters.

As to current problem of straightness defects and uneven quenching thickness of rail head, heating device with several induction loops are used, and through a three step strategy to realize simultaneously heating to head and bottom of rail. In air jetting phase, spray nozzles are replaced by Al alloy plates(20mm thick) with holes, adjusting to cooling strengthen can be realized by changing cross-section of holes, cooling rate is 2~4°C/sec. After the air jetting phase, there is a waterfog jetting phase, which makes 200°C temperature gap between head and bottom of rail, to ensure quenched rail has good straightness after 48h natural aging.

This paper puts forward the importance and advantage of using virtual simulation experiment to test the performance of vehicle environment. Through the construction of virtual pavement under different environments such as typical virtual test ground and wading test ground, the mobile performance experiment and capacity experiment of different types of heavy trucks were carried out, and the vehicle performance was evaluated as a whole. The virtual simulation test, by simulating the typical environment that may be encountered in the process of vehicle driving, collects the vehicle running state and driving parameters, studies and analyzes their performance, and provides an important basis for the improvement and improvement of vehicle design.

A elastic-plastic analysis of AlN/Cu jointing plate was performed by FEM to study the residual stress produced in the jointing-cooling process. This residual stress due to the difference of thermal expansion coefficient between ceramics and metal was analyzed, considering the presence of initial defects in ceramics. A static fatigue life was estimated based on a stress intensity factor of the supper-posed stress of the residual stress and the bending stress in ceramics of AlN/Cu jointing plate with the various thickness of Al2O3 layer.