Measuring the Residual Stress by Using New Experimental Methods Depend on theStress Concentration

The residual stress is that which remains in a body that is stationary and at equilibrium with its surroundings. It can be very detrimental to the performance of a material or the life of a component. Alternatively, beneficial residual stresses can be introduced deliberately. Residual stresses are more difficult to predict than the inexperimental methods to service stresses. There are many different measure the residual stress such as hole drilling and x-ray. In this paper , the new method is proposed to measure the residual stress in weldment, this method depends on the stress concentration factor for circle hole with different distance from weld line for different specimens (five specimens), the hole is the region of measure the residual stress .Also , the heat treatment is applied for different specimens as same condision and dimention to measure the decrease in the stress .The results are in a good agreement with another method.