Aiming at the bond?slip behavior of reinforced concrete, the finite element model of reinforced concrete bond?slip based on cohesion model was constructed by ABAQUS finite element software. The mesh sensitivity and cohesion parameter sensitivity of the simulation model were explored by energy and load?displacement curves. Aiming at the problem of bond strength of reinforced concrete, a nonlinear autoregressive exogenous network (NARX) was developed to predict the load?displacement curve for reinforced concrete by creating 20 sets of data with the variables of bond length, reinforcement diameter, and loading method. The study shows that the mesh size of 6 mm provides an ideal balance between prediction accuracy and computational cost. Based on the sensitivity of the finite element prediction results, the cohesive parameters are in the sequence of damage initiation strength, fracture energy, and stiffness. The NARX with the prediction accuracy of 99.6% is promising to replace time?consuming numerical simulations and experimental works to achieve an efficient and accurate prediction of the bond strength of reinforced concrete. Such an efficient and accurate prediction method provides a novel and convenient methodology of predicting and designing the bond strength of reinforced concrete.

Took the boom of small hydraulic excavator working device as the research object, finite element analysis model was done. Pro/E 3D software was used to build the threedimensional model of the boom of the excavator working device, then imported into ANSYS software through seamless interface software Pro/E and ANSYS software. In addition, ANSYS was used to carry out the static and modal analysis of the boom, and corresponding stress contours, displacement contours, modal frequencies and vibration modes were obtained, which offered theoretical references for the structure optimization design.

Through 3d ANSYS software, the belt pumping unit 3d model was established, the belt pumping unit structure was analyzed. Got the support maximum stress and displacement distribution maps, got some conclusion by analyzing the results. Based on this for the pumping unit for structure optimization design, three kinds of improved models was put forward, though the three kinds of models analysis, got the three models of the displacement and stress distribution maps. The results show that even the oil pumping unit design meet the requirements, it also can proceed the further optimization, changing the stress smaller angle stress model and raking prop, strengthen the main force position, not only greatly improve the stress state, but also make the structure more reasonable, economy applicable. 

Milling head is the important actuator of divided milling machine. The strength value of milling machine has big affection in reliability when it working. Thus, the static and modal analysis used finite element software ANSYS has important meanings. The geometric model of milling head was builded by 3D software Pro/E and tested the interference of the model. The finite element was constructed through the connector of Pro/E and ANSYS and made modal and static analysis through ANSYS. The results of dynamic simulation show that there is no interference produced. The results of modal analysis show that there is no resonance phenomenon produced. At the same time, the results of static analysis show that the stiffness and strength is satisfied. Theoretically, the results of software provide references for the structure and optimizing design of the machine.