Safety Assessment System Development For Pressure Pipelines Containing Incomplete Welding Defects Based On The Qt And ANSYS

Our research group has established a safety assessment method of pressure pipe which bases on the actual load on the pipe. The safety assessment applies to pressure pipe containing incomplete welding defects under combined bending, torsion and internal pressure loading. In order to be convenient for engineering application, our research group has derived engineering estimation formula and formulated procedures of the safety assessment via many experiments and finite element analysis.Although the safety assessment procedure has been simplified, it remains necessary to abtain the load in vinicity of defects which can be derived from finite element simulation packages. In this paper, author takes advantage of the redevelopment tools of ANSYS, C++and the extension libratry of C++named Qt to develop a safety assessment system which bases on the safety assessment method. The interface and analysis process of the system are simple. The system can give accurate assessment result. The fuctions the system provides are as follows:1. Provide visual interface for pipe modeling, user can view the pipe model they modeled in time. The graphic component which shows the pipe model is caught from ANSYS directly, and is encapsulated.2. Realize the kernel interface module:by research the redevelopment tools and work mode of ANSYS, the system realizes the overall control of ANSYS and the interaction with ANSYS by APDL. In order to make it easy for other developers to use, the kernel interface has been encapsulated.3. Realize auxiliary data module:in the system, all the project data are stored in XML files. Design the format of the project file; realize the functions of reading, writing and updating of the project file; realize the function of translating the project data to APDL command stream.4. In the system, user can expediently insert variety of pipe fittings, such as straight pipe, elbow, flange, valve, expansion joint and tee.5. Design a simple operation method. Force, moment, displacement load and spring hanger can be expediently inserted into specific location.6. User establishs the pipe model and input the parameters of defects, the system solves the problem automatically, and output the detailed result of safety assessment.