The mechanical properties of polyethylene (PE) materials are greatly influenced by their molecular structures, environmental temperature, and strain rate. In this study, static dynamic compression tests were performed on two semicrystalline PE materials—ultrahigh weight (UHMWPE) high-density (HDPE). stress–strain curves HDPE UHMWPE under uniaxial at temperatures −40–120 °C rates 0.001–5500 s−1 ...

A long time lag is the main characteristic of gypsum mined gob collapse disasters. With coring a rock specimen from supporting pillars in gob, which formed over several years, strength weakening effect with long-term overlying strata pressure revealed by experimentation. The results show that: uniaxial compression stress–strain curves represent major differences different lateral depths same pi...

To investigate the coupling damage characteristics of rock after high-temperature treatment under impact load, dynamic uniaxial compression tests for deep sandstone specimen laboratory conditions varying with high temperature (i.e., 25°C, 100°C, 300°C, 500°C, 700°C, and 900°C) strain rate 170 s-1, 205 240 s-1) were performed using splitting Hopkinson pressure bar (SHPB) system. Coupling variabl...

the main cause of structural damage in buildings subjected to seismic actions is lateral drift. in almost all reinforced concrete (rc) structures, whether designed with walls or frames, it is likely to be the code drift limits that control the design drift. the design drift limits and their contribution to damage may be represented indirectly through the material strain limits. the aim of this ...

The exceptional structural strength and low cost of steel-concrete composite columns make them a popular choice for civil engineering structures. Numerous forms columns, including steel tubes filled with concrete, have been produced recently in response to various construction situations. Cold-formed tubular concrete filling higher ductility due their capacity withstand inner buckling postpone ...

The aim of the present study is the prediction of critical conditions (including critical strain and flow stress) for the initiation of dynamic recrystallization during thermo-mechanical processing of plain carbon steels. For this propose, torsion tests were conducted at different temperature (1050, 1100 and 1150˚C) and strain rates (0.002, 0.02 and 0.2/s). All flow curves showed a peak st...

The existence of fractures has a significant influence on the mechanical properties rock mass. sensitivity mass’s to fracture’s geometric parameters is conducive improving measurement accuracy fractured mass engineering. Firstly, fracture in dam site area Lianghekou Hydropower Station were counted using ShapeMetriX3D system. Then, effect deformation characteristics, failure mode, and investigat...

Among the titanium alloys, Ti-6Al-4V is the most widely used. In the present work, the uniaxial hot compressive behavior of Ti-6Al-4V has been investigated under constant strain rates. A series of dilatometery experiments were carried out to determine the transformation temperatures at different cooling rates. Specimens were homogenized at 1050 °C for 10 minutes followed by fast cooling to dif...

The aim was to investigate the correlation between estimates of compression ratio, compression threshold, and cochlear gain for normal-hearing subjects inferred from temporal masking curves (TMC) and distortion-product otoacoustic emission (DPOAEs) input-output (I/O) curves. Special care was given to reduce the influence of DPOAE fine structure on the I/O curves. Data were collected for 10 subj...

Abstract Ballistic gelatin, soap, and clay are three human simulated target materials commonly used in the field of wound ballistics research. Currently, there more studies on ballistic gelatin’s mechanical properties, but rarely soap. In this paper, properties soap were tested by using universal material testing machine Hopkinson bar, respectively, their stress-strain curves obtained under dif...