Comportamiento de laminaciones coplanares y no coplanares en acero API5L X52 simuladas mediante elementos finitos

The mechanical behavior of the coplanar and non coplanar laminations by finite element using non lineal material conditions was determined, with the purpose of knowing the interaction sequence of the stress fields in the crack tips. The analysis includes a matrix simulation considering the circumferential length lamination, wall thickness of the pipe 610mm diameter, with vertical and horizontal distance for non coplanar laminations. The stress distribution in the laminations regions as a function of the internal pressures in the cracks and pipe were determined. The simulations done allowed defining the yield and the strength pressure that reach the mechanical properties of the API 5L X52. It was found that coplanar laminations with 24 at 127mm of circumferential length resist 50% more yield pressure than the non coplanar laminations and 100% more pressure than the maximum allowable. Based in the plots of pressure-vs- lamination radius it is concluded that non coplanar laminations have higher cracking risk in the pipeline.