This paper is concerned with the inelastic behavior of axially loaded concrete-filled thin-walled steel tubular columns subjected to local buckling. A nonlinear fiber element analysis program accounting for local buckling effects is developed for predicting the ultimate strength and ductility of concrete-filled thin-walled steel tubular columns. The effects of local buckling are taken into cons...

Materials with ultrafine grain sizes are attractive for use in micro-forming operations. High-pressure torsion (HPT) is an effective technique that allows disc materials subjected to torsional deformation to generate microstructures with significant grain refinement. Generally, ultrafine-grained materials exhibit high strength but their ductility is limited because they have both a low rate of ...

This paper investigates the role of sheathing-to-framing connection ductility in evaluation structural q-behaviour factor for Light-Frame Timber (LFT) buildings, by means Incremental Dynamic Analyses (IDA). approach allows to consider nonlinear cyclic behaviour walls, which cannot be taken into account with sta...

Herein, the effects of Ca content on microstructure, texture and mechanical properties extruded Mg–3Al–0.4Mn–xCa (x = 0.4, 0.8 1.2 wt%) rods are systematically investigated. The results reveal that alloy, with wt%, exhibits highest strength ductility, possessing an ultimate tensile 267.57 MPa elongation (EL) 16%. This is mainly due to gradual transformation typical fiber into a [10-11] componen...

Ductility demand during an earthquake has long been known to be a good measure of structural damage in buildings during earthquakes. For design purposes it is considered a priori according to some rules that may or may not apply to each building. Such ductility parameters are mostly based on the response of a single degree of freedom system to ground motions. However, it has been probed that th...

Nomenclature A new representation of engineering analysis models, termed product model-based analytical models (PBAMs) was introduced previously [Peak and Fulton, 1992b]. Since PBAMs link analysis information with detailed design information, they enable rapid, flexible analysis in support of product design. Nf average cycles to failure ∆ε p plastic cyclic strain range c fatigue ductility expon...

A major drawback in using bulk metallic glasses (BMGs) as structural materials is their extremely poor fatigue performance. One way to alleviate this problem is through the composite route, in which second phases are introduced into the glass to arrest crack growth. In this paper, the fatigue crack growth behavior of in situ reinforced BMGs with crystalline dendrites, which are tailored to impa...

Recent studies have shown that nanotwinned copper (NT Cu) exhibits a combination of high strength and moderate ductility. However, most engineering and structural applications would also require materials to have superior fracture toughness and prolonged subcritical fatigue crack growth life. The current study investigates the effect of twin density on the crack initiation toughness and stable ...

It has been possible in recent times to make large quantities of steels in which the controlling scale is 20 nm or less, i.e., comparable to that of carbon nanotubes. The mechanical properties of such steels are abnormal. For example, in some cases the ductility vanishes as the strength increases, whereas in others the ductility almost entirely consists of uniform plastic strain. Some of the st...

High temperature tensile tests have been conducted on samples of a Fe-Ni based superalloy, Incoloy A-286, and significant ductility loss has been observed at 1220 °C. Titanium-rich, thin-film-like phase has been found on the inter-granular facets of fracture surfaces. It appears that sulfur content of Ti-rich phase was higher than that of the matrix. At 1220 °C, liquation of Ti-rich phases has ...