Abstract— Near threshold fatigue crack growth under mixed‐mode loading and elastic plane‐strain conditions has been studied in 316 stainless steel laboratory air at room temperature. Particular emphasis was placed on the influence of mode II component. Crack from starter crack, although initially coplanar, branches to be perpendicular maximum normal stress. However for branched is controlled not only by I displacement, but also Upper lower bound curves are obtained condition discussed terms...

To increase the utilization and value of poplar, various concentrations dimethylol dihydroxy ethylene urea (DMDHEU) were used to impregnate an important tree specie from north China. The resin was fixed on timber under certain conditions, after which weight percent gain (WPG), flexural modulus (MOR), elasticity (MOE), impact strength, hardness compressive strength poplar impregnated tested evaluated. results showed that WPG is positively associated with DMDHEU treatment; when 62.1%...

Abstract Highly filled wood flour/recycled high density polyethylene (WF/RHDPE) composites were directly prepared by in situ reactive extrusion using a twin‐screw/single‐screw extruder system. The effects of dicumyl peroxide (DCP) content on pressure, rheological behavior, mechanical properties, fractured surface morphology the composites, and melting temperature RHDPE investigated. pressure torque WF/RHDPE composite melt increased with DCP content. Mechanical property tests scanning...

Abstract— The effect of non‐proportional overloading on both low cycle and high fatigue life has been studied. Low multiaxial tests were performed EN 15R (a alloy steel) using sequential loading blocks which comprised uniaxial “ordinary” cycles torsion “overload” cycles, vice versa. In fatigue, the behaviour mode I crack growth in a medium carbon steel subjected to mixed (I II) was examined. Under tension‐torsion overloading, shows an earlier transition from Stage II with pronounced...

This paper focus on the optimum design of arc-shaped rubber hose, so that hose has a good balance performance and higher burst pressure. Based thin shell theory without considering bending moments shear force, equilibrium equation was established to obtain internal force under pressure, pressure obtained by using Tsai-Hill failure criterion. According mechanical model influence structural parameters distribution vulnerable positions studied. Then, in order determine satisfying performance,...

Abstract— Near threshold, mixed mode (I and II), fatigue crack growth occurs mainly by two mechanisms, coplanar (or shear) branch tensile) mode. For a constant ratio of Δ K I /Δ II the shear shows self‐arrest character it would only start again when are increased. Both early stages tensile growth, crystallographic nature; proceeds along slip planes or grain boundaries. The appearance fracture surfaces suggest that mechanism extension is developing band microcracks which join up to form...

The mechanical model related to the balance and stiffness characteristics of bellows type rubber hose under internal pressure was studied. Based on thin shell theory without considering bending moments shear force, equilibrium equation established obtain angle different environments. Considering deformation rope structure hose, divided into two stages, including winding deflection tensile fiber. Then constitutive anisotropic material introduced, physical characteristics. According model,...

This article focuses on the establishment of theoretical model for formation balanced curved rubber hose under pressure. According to rotation angle cord along axial direction in is same as that straight before forming, length was established. Then based thin shell theory without considering bending moments and shear force, deformation characteristics rope structure mechanical equilibrium hose, balance performance model, influence structural parameters studied. Eventually, finite element...

The fatigue property of a TRIP (transformation induced plasticity) steel after resistance spot welding (RSW) is investigated. It found that the strength weld only 8.9% original TRIP800 steel. This result microstructure mismatch in heat affected zone (HAZ) due to different cooling rates during RSW. A maximum variation about 220HV microhardness observed at areas from relatively narrow HAZ. degradation attributed inhomogeneous distributions and HAZ its adjacent zones. crack initiated between BM...

In order to make high performance wood-plastic composites (WPCs) from wood-fiber and mixed plastic wastes, virgin resins were compounded simulate which included polypropylene, polyethylene and/or polystyrene, then grafted with maleic anhydride (MAH) by reactive extrusion. Highly filled WPCs prepared extruding. Mechanical testing results showed that the mechanical properties of based on waste plastics both significantly enhanced. The compatibility between different in blend system interfacial...

SAE 1065 steel wire ropes are prone to individual fracture due the martensite structure with high carbon and microhardness formed on surface because of friction. A new low-carbon microalloyed composed lath bainite fine carbides dispersed in bainitic ferrite is developed this paper. For a diameter 1.0 mm, tensile strength low-cycle fatigue resistance higher than those commercial wire. It shown that caused by as-quenched formation severe plastic deformation can be avoided Also, design process...

Improving the physical, mechanical, and creep properties of wood fiber-reinforced polymer composites is crucial for broadening their application prospect. In this research, seven types high-density polyethylene (HDPE) reinforced with different mass ratios Masson pine (Pinus massoniana Lamb.) Chinese fir [Cunninghamia lanceolata (Lamb.) Hook.] were prepared by a two-step extrusion molding method. The two fibers 60:0, 50:10, 40:20, 30:30, 20:40, 10:50, 0:60, respectively. surface color,...

As a new strategy to effectively use wood and plastic wastes, composites of high content flour (WF) recycled density polyethylene (RHDPE), with without maleic anhydride (MAPE) as compatibilizer, were prepared by direct extrusion using twin-screw/single- screw extruder system. The effects MAPE on the properties composite investigated mechanical tests, torque rheological analysis, scanning electron microscopy (SEM), differential calorimetry (DSC). results demonstrated that greatly improved...

Abstract The application of a new composite biofilter with batch-type mud membrane (CSBF) series deep treatment filter (EBF) combination in urban domestic sewage was studied. results 20-day operation data show that the process has good removal effect on COD, NH3-N, TN and TP. average rate COD during is 94.63%, NH3-N 99.02%, 77.89%. TP 97.99%, each index stable to first-class A standard GB8978-1996, which can reach surface water class IV standard.

Abstract Due to coupling of oxidation damage and mechanical damage,failure mechanism C/C composites is complex under high-temperature environment.In this paper,establishment cumulative analysis method based on damage.Based method,high-temperature model established: Initial criterion degradation mode stiffness in are modified by state parameter;Diffusion coefficient oxygen parameter.Through joint simulation multiple physical fields MATLAB ABAQUS,oxidation properties environment studied,which...

This paper introduces a liquid helium (LHe) cryogenic target, developed at the Technical Institute of Physics and Chemistry, which has separated vacuum interval gas cooled shield for heat insulation. The target can work in poor (∼100 Pa) container with plate directly facing room temperature surface shock system. By using continuous flow an exhausting pump to decrease back pressure reservoir, sample cabin reached 3.6 K be adjusted any point between 80 stability better than ±0.2 K. In adhesive...