A method for optimized testing of wind turbine blades under cyclic loading is experimentally demonstrated in this paper. The uses continuous linear optimization to find the best combination different uniaxial and multiaxial test blocks achieve material-based damage targets across blade minimize time. By applying on a real commercial comparing it with standard fatigue performed same type, presen...

Fatigue failure usually occurs on the subsurface in rolling bearings due to multiaxial and non-proportional fatigue loadings between elements. One of main stress components is alternating shear stress. This paper focuses micromechanism plastic accumulation damage initiation bearing steels under cyclic deformation. The distribution was firstly investigated by finite element simulation. An atomic...

Non-proportional multiaxial stresses in welded structures cause higher fatigue damage than proportional stresses. In this paper, a new approach based on principal component analysis for quantifying the level of non-proportionality stress signals is developed. The quantifier developed large-scale (civil and offshore structures), where influence mean negligible. proposed compared validated with o...

A 3D nonlinear approach for predicting the fatigue damage of plain journal bearings is proposed. The criterion selected, among several models, inspired by Dang Van’s but modified through an ascending slope in tensile direction. This consistent with stresses seen on bearing shells hydrodynamic oil pressure and allows to reflect severity compressive multiaxial non-proportional loading. From a tes...

A series of biaxial High Cycle Fatigue tests at room temperature is performed to build up an extensive and well-documented database. The testing specimen is a maltese cross thinned in its centre with non homogeneous strain/stress fields. The experimental protocol uses exclusively full-field strain measurements. The strains (cyclic and residual) as well as the crack initiation detection are obta...

The effects of a non-articulated SACH and a multiaxial foot-ankle mechanism on the performance of low-activity users are of great interest for practitioners in amputee rehabilitation. The aim of this study is to compare these two prosthetic feet and assess possible improvements introduced by the increased degrees of freedom provided by the multiaxial foot. For this purpose, a group of 20 hypomo...

A Failure Assessment Diagram (FAD), developed for rolling contact, was specifically formulated railway wheel steels. The FAD allows combining a multiaxial fatigue criterion with the linear elastic fracture mechanics concept; in particular, it used to assess failure wet related pressurization of fluid entrapped surface cracks. approach applied results previous bi-disc tests carried out on three ...