When drilling or exploiting fractured formations, gas fluid displacement and invasion often occur, is very subtle difficult to find. The in the fracture enters wellbore arrives near wellhead with fluid. Improper treatment may lead serious accidents such as lost circulation blowout. In this study, using computational dynamics (CFD) simulation software for modeling grid generation, based on volum...

For adhesively bonded joint security and long-term use of the joint, a precise stress analysis must be performed on single-lap joints. A formed by joining two layers at given lap length, is most widely used adhesive type in practice. Nowadays, it stated that mechanical properties strength can increased adding clay graphite to polymeric material joints, trying estimate for various loading condit...

die less explosive forming of circular plates is one of the most useful methods in the industries especially chemical applications. manufacturing of large vessel's head, multilayer rings and some parts of heat exchangers are the example of applying this method. many theoretical and experimental researches about examining the explosive forming of simple and single layer plate have been done...

in this paper, an analytical model is introduced to show the cyclic behavior of the structures, considering degradation phenomena including pinching, stiffness degradation, strength deterioration and sliding effects. this model is based on well-known mostaghel’s model though some essential modifications as well as sliding effect are also taken into account. this model is developed based on a si...