Strain hardening cementitious composite (SHCC) is a special class of ultra-ductile material which has autogenous self-healing capability due to its intrinsic tight crack widths. To further improve healing ability, agent (HA) can be incorporated in SHCC, enabling it also the autonomous mechanism. In this study, effects adding bacteria-embedded polylactic acid (PLA) capsules on mechanical propert...

This study presents an investigation about the effect of fire flame on punching shear strength hybrid fiber reinforced concrete flat plates. The main considered parameters are type (steel or glass) and burning steady-state temperatures (500 600°C). A total 9 half-scale plate specimens dimensions 1500mm×1500mm×100mm 1.5% volume fraction were cast divided into 3 groups. Each group consisted that ...

Ductile fracture and extremely low cycle fatigue (ELCF) [1] are two common failure modes in aircraft engines and turbomachinery designs [2]; however, the linkage between these two failure modes under multi-axial loading conditions has never been systematically studied. Inconel 718 (IN718) is one type of high temperature alloys widely used in turbomachines. Specially designed specimens and tests...

The aim of this study is to compare the seismic performances strengthening techniques applied reinforced concrete (RC) non-ductile frames tested under effects loads. In experimental part study, one-third scale, one-bay, two-storey hollow brick infilled RC were strengthened with five different and reversed cyclic lateral One being reference, bricks plastered on both sides, one was plain mortar, ...

This paper deals with the structural behaviour and strengthening of adobe vaults representative from historical buildings city Yazd, Iran. Eight destructive tests were performed on 1:3 scaled vault models by loading them at 30% span in loading–unloading cycles increasing vertical displacement. The tested considering both unstrengthened strengthened conditions, where consisted an externally bond...

High-velocity (-•2 to -•5 km/sec) impacts into octahedrite iron meteorites (Gibeon, El Sampal, and Arispe), steel, and iron targets were made at the NASA-Ames Vertical Gun Facility. The experiments clearly revealed the brittle behavior of meteorites at very low temperatures (<200 ø K) as indicated by spallation of the crater rim and the development of deeply penetrating fractures in the meteori...

Fracture mode of ductile solids can vary depending on the history of stress state the material experienced. For example, ductile plates under remote in-plane loading are often found to rupture in mode I or mixed mode I/III. The distinct crack patterns are observed in many different metals and alloys, but until now the underlying physical principles, though highly debated, remain unresolved. Her...

The study of mechanical behavior of the structural steel S400 under quasi- static and dynamic loading has been the subject of this investigation. In oder to obtain different stress - triaxiality conditions the specimens were notched with 1, 1.5, 2 and 3.5 mm notch radius. The results of fractography show as the velocity of tension increases, ductility reduces and a ductile-brittle transition oc...