This research proposes a reliability simulation method combining the finite element simulation technology and stress-strength model to predict the structural reliability of girth welds with the following steps. Firstly, a group of finite element simulations of the girth welds are carried out considering uncertainties of elastic moduli in the weld and core barrel materials. Then the maximum von-Mises stresses over the welds are extracted from those simulations to generate the stress distribution. Finally through a stress-strength model, the structural reliability of the girth weld is calculated by assuming its yield strength following a Normal distribution. In addition, via the proposed method, influences factors such as temperature, pressure and the uncertainty level among the elastic modulus on the weld reliability are discussed in detail.

No abstract

Using Pro/E powerful entity modeling functions and ANSYS finite element analysis of the powerful function, both integration, to spoke type large head sheave work state are analyzed, and establish the mechanical model of the finite element. Through the finite element calculation, carry the strength analysis and research to head sheave in the different conditions. The calculation results show that head sheave works in alternating stress, it is concluded that head sheave of deformation and stress distribution laws. To design and develop spoke type large head sheave provides the basis.

The use of Pro/E features a powerful solid modeling and ANSYS finite element analysis a powerful, integrated analysis of the two methods on the shelf for static analysis and modal analysis, obtained the stress, strain and natural frequency and the cloud vibration mode, the correct design of the shelf provides a reasonable theoretical basis. Checking the strength of the shelf structure can shorten the shelf of the production cycle, reduce costs and improve shelf quality, has a certain value engineering practice.