The inspiration for this research was the numerical simulation of mass loss of char particles during its combustion in a CFB boiler. The mass loss was presented as the superposition of two separate processes i.e. combustion and surface erosion. The values obtained by the model and experimental data show a good level of conformity. INTODUCTION Until now many authors have attempted numerical simu...

INTRODUCTION: Radiation cross-linking is used to decrease wear in ultra high molecular weight polyethylene (UHMWPE) as a total joint arthroplasty bearing surface [1,2] but it also reduces its fatigue strength [1]. Current research focus is to improve the fatigue strength of wear and oxidation resistant cross-linked UHMWPEs in order to improve their use in high stress applications and young and ...

The hysteresis loop, described during the formation of stressinduced pseudoelastic martensite in a Cu-Zn-A1 betaphase single crystal, was studied as a function of strain-rate, deformation amplitude and temperature. The aPtm, the stress at which the transformation starts at a given constant temperature, is strain-rate independent but the hysteresis described by the stress-strain curve shows a ma...

In this paper the TMF crack initiation behaviour of the single-crystal nickel-base superalloy MD2 is investigated and modelled. TMF tests were performed in both IP and OP for varying mechanical strain ranges in the [001] crystallographic direction until TMF crack initiation was obtained. A crystal plasticity-creep model was used in conjunction with a critical-plane approach, to evaluate the num...

Transverse vicoelstic extensbli was measued directdy in isolated wails of Nitella internode cell. Cell wails extended transversely exhibit a yield point which is approximately twice the yield point in the lontudinal direction. Walk from youn, growing cels are four to seven times more extenble t than transversely, whrle wall from mature, norowng cells are only two times more extensibe longtdinlb...

Statistical concepts from Design of Experiments were used to study the effect of thermal processing on the mechanical properties of 6061 aluminum. The soak temperature, cooling rate and soak temperature/cooling rate interaction term were found to be the most influential processing variables. Soak time and heating rate were statistically insignificant in the current experimental design, but modi...

Laser beam melting (LBM) is an advanced manufacturing technology providing special features and the possibility to produce complex individual parts directly from a CAD model. TiAl6V4 most common used titanium alloy particularly in biomedical applications. TiAl6Nb7 shows promising improvements especially regarding biocompatible properties due substitution of hazardous vanadium. This work focuses...