The relationship between impact damage and the fatigue behavior of � -TiAl has been examined. Axial fatigue specimens fabricated from cast Ti-47.9Al-2.0Cr-1.9Nb (to be referred to as 48-2-2) and Ti-47.3Al-2.2Nb-0.5Mn-0.4W-0.4Mo-0.23Si (to be referred to as WMS) alloys were damaged by impact under controlled conditions with a 60 deg wedge-shaped indenter to simulate assembly-related damage in lo...

in this paper, the present state of knowledge about axial mixing in gasliquid reactors is reviewed. a brief outline of the methods for measuring residence time distribution(rtd)of various phases in a multiphase reactor is presented. this is followed by a short description of differential and stage-wise models for characterizing back mixing from rtd measurments. backmixing characteristics of som...

In this paper, a dual-scale modelling approach is developed to investigate creep-fatigue behavior and predict crack initiation life for holed structures under multi-axial stress state. The macro-scale simulation supplies local deformation histories the as boundary conditions. process, micro-mechanical damage evolution are described by using crystal plasticity. order validate procedures, series ...

This paper investigates the influence of drilling process on an aluminum 2024-T351 part in terms surface integrity and fatigue strength. Two processes (axial; orbital) are considered. The is studied through roughness measurements, microstructure hardening analysis residual stress assessment. An innovative Hole Opening Comparative Technique set up to assess state. Fatigue tests conducted with op...

The subject of the study is stress-strain state a cold-formed steel structural members under axial compression. aim to experimentally behavior sample from thin-walled profile in compression with stress control. A mechanical method was used test samples on universal testing machine, strain gauge for measuring relative deformations by gauges data collection registration unit. processing results c...

BACKGROUND Passive ankle stability under weight-bearing conditions has been found to depend substantially on the role of the articular surface geometry. In the present study, it was hypothesized that, in the ankle under axial loading, contact-stress changes in response to alterations of external load involve reproducible and specific patterns to maintain ankle stability. METHODS Six cadaver a...

The paper presents an analytical model for the estimation of shear stress at the interface of adhesively bonded layers in laminated composites. For this purpose, a new shear stress function is proposed that accounts for the influence of shear lag in laminates assembled using adhesive layers of different types and thicknesses. In addition to the estimation of interfacial stress, the function can...

Through laboratory simulation experiments, this paper studies the influence of different temperature and stress conditions on strain changes raw coal samples induced by CO2 adsorption with tri-axial creep-seepage adsorption-desorption experimental system. Comparing analyzing results, study shows that: (1) within a certain time, axial radial sample both show growing trend as time increases for i...

introduction: determining the proper angle for inserting central venous catheter (cv line) is of great importance for decreasing the complications and increasing success rate. the present study was designed to determine the proper angle of needle insertion for internal jugular vein catheterization.  methods: in the present case series study, candidate patients for catheterization of the right i...