Residual stresses

The present work investigates numerically the influence of heating temperature on the thermal and mechanical behaviour of INCONEL 738 LC, which is used in the TIG welding process for castings made from a nickel-based superalloy. The transient heat transfer process is modelled in the ABAQUS solver using the finite element method (FEM) for the volumetric double ellipsoidal heat source model of Goldak, which simulates a welding torch that moves.

Mathematical models and methods for determination of axisymmetric residual stresses in a finite cylinder are considered. The model of residual stresses is built using the conception of incompatible eigenstrain tensor. Within the frame of this model, a direct problem for residual stresses determination is formulated. A method based on the variational method of homogeneous solutions is developed for solving the direct problem. Using the obtained solution, features of residual stresses, caused by continuous and piece-wise homogeneous distributions of eigenstrain components are studied.

There are considered the technological ability to manage residual stress during machining by correcting the distorted structure of the treated surface det-lei new vector machines cutting speed for roughing and finishing operations processing.