Among the various methods existing to fabricate porous titanium for structural or biomedical applications, the spaceholder approach is particularly useful as it allows a close control of pore size, shape and fraction. In this method, a blend of pure or alloyed titanium powders and space-holder materials are cold-pressed into a preform which is sintered in vacuum. During the early stage of sinte...

First row rotating blades of four axial-flow compressors were prematurely fractured. Previous investigations showed that the site atmosphere contains corrosive compounds which lead to an increase in possibility of pitting on the blades. It was also revealed that the crack was originated from two corrosion pits. Thus, this work is conducted to ascertain which of fatigue or stress corrosion crack...

We solve the matrix equation XA+AX = 0, where A ∈ C is an arbitrary given square matrix, and we compute the dimension of its solution space. This dimension coincides with the codimension of the tangent space of the congruence orbit of A. Hence, we also obtain the (real) dimension of congruence orbits in C. As an application, we determine the generic canonical structure for congruence in C and a...

This paper describes the structural design, digital fabrication and construction of KnitCandela, a free-form, concrete waffle shell with KnitCrete, falsework-less formwork approach using custom prefabricated knitted textile as multi-functional, shuttering layer form-found cable net main load-bearing formwork. The digitally designed fabricated provided integrated features for inserting guiding e...

The wire arc additive manufacturing (WAAM) technology in combination with computational design shows a big potential for realising novel force-flow optimised and material-efficient connections. This contribution deals point-by-point WAAM, material deposition strategy that allows to place precisely where structurally needed or aesthetically desired. could be applied, among others, type of steel ...

abstract: one the most important problems in recent sensitive loads is the quality of voltage. for this challenge custom power devices are used in distribution systems. dynamic voltage restorer (dvr) is a custom power device that improves voltage, decrease power distortion, filter harmonics and balance distributed generations (dgs) with low voltage distribution system. in this paper, a new algo...

This paper analyzes the corrosion resistance and mechanical microstructural properties of a welded joint ductile cast iron using AISI316L stainless steel as filler material three different heat treatments: preheating at 250 450 ºC post-weld annealing treatment. The results show presence ledeburite interface between weld bead affected zone root pass, along with loss strength ductility when weldi...

This study aimed to evaluate the effect of elevated temperatures on bond-slip behavior hooked-end steel fibers. A total 180 pullout specimens were tested in post-cooling conditions using a double-sided test with multiple embedded fibers for target between 25 and 750 °C. Results proved that bond strength significantly increases up 450 °C, drastically decreases 600 The contribution hooks reduced ...

PURPOSE: An analytical model to predict the response of mounds placed in the offshore is presented, with the overall aim of providing a technique for the preliminary design of mounds subjected mainly to cross-shore sediment-transport processes induced by non-breaking waves. For example, offshore mounds created from dredged material can be used to protect sandy beaches by dissipating wave energy...