The reliability of pressure pipeline containing defects in engineering is very important. The pipeline of the oil industry may contain types of potential defects. It should be considered the defected size, the uncertainty of the loaded parameters, so introduced the Monte Carlo method to use random sampling for these uncertain parameters. Monte Carlo method is based on the probability and statistic theory method, it can realistically describe the characteristics of the random things, and overcome the disadvantage of the deterministic failure analysis method, more accurate calculate the failure probability of the pipeline, it provides a technical means for diagnosing system security of petrochemical enterprise.

 

By utilizing finite element analysis software ANSYS, a finite element model for rubber O-sealing ring and its boundry was set up.The change of shape and stress distribution under different oil pressure and initial compressibility was analyzed, and the relations between maximum contact stress, oil pressure and initial compressibility was deduced. Then the position of possible crack was described , which is a theoretical basis for reasonable installation and use.

For heat distribution in turbine rotor-bearing system being imbalance, the rotor-bearing system would produce bent and vibrated strongly when it was started up. These would make system running unsafely. The transient imbalance responses of multi-degree rotor-bearing were analyzed respectively, while it was starting and running steadily. Furthermore, the heat vibration characters of the system and the impact caused by temperature distribution and starting acceleration were studied. It provides a reference for reducing the heat vibration amplitude of the rotary machine.

Using finite element method, the nonlinear contact between a rigid punch and a elastic half plane was analyzed. Through modeling and computing with ANSYS, the value of J-integral around the edge of the punch was obtained. The conservation of J-integral was certificated by series of data. And the contact stress intensity factor ( K _I) was gained through the relation between the J-integral and the  K _I. The results indicate that the  K _I by J-integral was in accord with the theoretical value. At last the KI of elastic plane with different thickness was calculated by the theory of J-integral.

Using finite element method, nonlinear stress, such as contact borderline and large deformation of C seal ring in high-pressure quickly opening blind plate, was analyzed. Through modeling and analyzing computing with ANSYS, contact deformation, contact stress and its distribution characteristics were obtained. And also, distribution law of contact pressure between seal ring and barrel of blind plate, and relationship between distribution and medium were gained. Furthermore, seal ability of C compound structure’s servo seal ring was effectively analyzed.