In light of its frequency-dependent penetration depth, the measurement of eddy current conductivity has been suggested as a possible means to allow the nondestructive evaluation of subsurface residual stresses in shot-peened specimens. This technique is based on the socalled electro-elastic effect, i.e. the stress-dependence of the electrical conductivity. Unfortunately, the relatively small ch...

The compressive stress distribution below the specimen surface of severely surface deformed steels by shot peening was investigated by using laboratory X-rays and high-energy X-rays from a synchrotron radiation source, SPring-8 in the Japan Synchrotron Radiation Research Institute. Medium carbon steel plates were heat treated in two different conditions. The Vickers hardness of material-A and B...

Because of their frequency-dependent penetration depth, eddy current measurements are capable of mapping the near-surface depth profile of the electrical conductivity. This technique is used to nondestructively characterize the subsurface residual stress and cold work distributions in shot-peened metal components. Unfortunately, the spurious surface roughness produced by the shot peening proces...

This work presents a non-destructive method for quantitative essessment of fatigue damage materials with linear elastic properties using nonlinear ultrasonic techniques. A study was conducted on these and shot peening processing technique. numerical based the semi-analytical finite element (SAFE) technique, used to obtain phase-matching modes specimens. Experiments confirm that nonlinearity sam...

Fatigue fracture is the major threat to railway axle, which can be avoided or delayed by surface strengthening. In this study, a low-carbon alloy axle steel with two states was treated induction hardening and shot peening, respectively, reveal mechanism of fatigue property improvement microstructure characterization, microhardness measurement, residual stress analysis, roughness rotary bending ...

The stability of compressive residual stresses and the stability of strain hardening states are seen to have high technical importance. For a laser beam welded AlMgSiCu-alloy, results of applied stress and residual stress relaxation at elevated temperatures 100<T<150°C are presented. These experiments prove the existence of back stresses. The level of these stresses can be estimated to be in th...