For technical support, contact [email protected] www.vishaymg.com 19 Revision 15-Aug-07 I. Residual Stresses and Their Measurement Residual (locked-in) stresses in a structural material or component are those stresses that exist in the object without (and usually prior to) the application of any service or other external loads. Manufacturing processes are the most common causes of r...

The well known sin2p method for macro-stress measurement elaborated for BraggBrentano geometry has some disadvantage e.g. penetration depth of X-ray beam varies during m.easurement. This is particularly important in the case of coatings or surface layers where residual stresses appear with large gradients, The new version of the sin’v method, named gsin’w (based on the grazing angle scattering ...

abstract: the equal channel angular rolling (ecar) is one of the severe plastic deformation processes, which can develop a shear deformation into a sheet metal. in this process, internal stresses are created due to the different strain levels experienced in different locations at the same time. the incremental hole drilling method is an effective technique for the evaluation of the through-thic...

Dilute Laponite suspensions in water at low salt concentration form repulsive colloidal glasses which display physical aging. This phenomenon is still not completely understood and in particular, little is known about the connection between the flow history, as a determinant of the initial state of the system, and the subsequent aging dynamics. Using a stress controlled rheometer, we perform st...

Finite element analysis (FEA) and continuum mechanics techniques have been used to model the thermal residual stress distribution in bonded joints and assess the suitability of using two-dimensional (2D) analysis methods. The methods are first employed to investigate stresses in metal-epoxy bi-material strip samples. The change in curvature of two bi-material strip systems during heating and co...

Autofrettage is a treatment to introduce beneficial residual stresses into thick-walled cylinders to improve their performance under repeated loading by internal pressure. In the present investigation the residual stresses are measured and their effect was analysed and discussed. The experimental determination of the residual stress distribution was performed by the crack-compliance-method. The...

Levels of residual stresses in partially crystallized Li2O±2SiO2 glass-ceramics were calculated for several crystallographic planes. The stresses were also determined by an X-ray di€raction method (XRD) using synchrotron radiation. The linear thermal expansion coecient (ahkl) of a fully crystallized, stress-free, powdered sample, was measured in situ using a hot-stage XRD technique. The therma...

Foreign object damage (FOD) occurs when hard, millimeter-sized objects such as gravel or sand and even the pieces of the engine components are ingested into aircraft jet engines. Particles impacting blades produce small indentation craters which can become sites for fatigue crack initiation, severely limiting the lifetime of the blade. In this study, the impact on the edge of a thin plate is in...

Introduction. It is well known that when a transparent non-crystalline solid, such as glass, is heated to a uniform temperature Tx and then rapidly quenched in a bath at temperature T0(T1 > T„) there results a non-uniform stress distribution. Depending on T, , one can divide these stresses into two distinct classes. If is sufficiently lower than the softening temperature of the material, then t...