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and corners of the 316 steel specimens have been dramatically constricted by grit blasting and spraying. Grit blasting has been found to exert a shot-peening effect on the mechanical properties of 316 steel specimens. Coatings with lower values of coating volume fraction strengthen the coated specimens in the very similar way as blasting. While if the volume fraction of coating, (Vv)c, exceeds......
by developing a new way. The self-healing agent based on biological carbonate precipitation was developed. Crack-healing capacity of the cement paste specimens with this biochemical agent was researched... healing as well.The experimental results show that the applied biochemical agent can successfully improve the self-healing capacity of the cement paste specimens as larger cracks can be healed. The cracks......
behavior of Ni-based superalloy GH586 with laser shock processing(LSP) was investigated. The residual stress of the specimens treated with LSP was assessed by X-ray diffraction method. The microstructure..., and dislocation cells in the microstructure of the specimens treated with LSP effectively prevented fatigue cracks propagation. The fatigue life was roughly twice as long as that of the specimens without LSP......
results show that the failure of strengthened specimens is mainly caused by rupture of CFRP jacket and buckling of inner section steel reinforcement. However, for the unstrengthened specimen, both of inner steel buckling and core concrete cracking are the main contributors to the damage. The load-bearing capacity, deformation and energy dissipation of the specimens during the fatigue test could......
stainless steel specimens were heat-treated by annealing at 900°C followed by quenching in water. During the cold rolling, the microstructure of the as-received specimen transformed from austenite... scans of the as-rolled and heat-treated specimens were obtained in 0.9 wt% Na Cl solution. The pitting potential of the four-pass rolled specimen was significantly increased from 322.3 to 930.5 m V......
and unexposed specimens for 2, 15 and 25 h. Experimental results show that the porous corrosion scale and γ′-depleted layer formed in gas hot corrosion condition alter the crack initiation mechanisms of the superalloy. Fatigue cracks of the pre-exposed specimens originate from multiple surface locations where spalling of the corrosion products occur,while nucleation of unexposed specimen begins......
; Research Center,Shanghai University,Shanghai 200444,China摘 要:<正>After being treated in different ways,Zr-Sn-Nb-Fe alloy specimens are exposed in 0.01mol/L LiOH aqueous solution at 350C under 16.8 MPa.The examination of microstructures and second phase particles (SPPs) of these specimens was carried out by high-resolution transmis- sion electron......
in the surface layer and promote the fatigue properties of welded specimens. By a recently developed approach-surface mechanical rolling treatment(SMRT), a gradient nanostructured surface layer is formed on welded S355 J2 W steel specimens. The mean grain size is refined to nanometer scale, and the hardness is significantly enhanced in the SMRT surface layer. Independent of the initially inhomogeneous......
, China)Abstract:A series of compression tests were conducted on 150 groups of cement paste specimens with side lengths ranging from 40mm to 200mm. The specimens include cube specimens and prism specimens with height to width ratio of 2. The experiment results show that size effect exists in the cubic compressive strength and prismatic compressive strength of the cement paste, and larger specimens......
engineering [1-4]. Currently, test method (mechanical or physical method) is widely applied to studying crack propagation rate (v). In mechanical method, three-point bending test of double-torsion specimen.... Enhanced microstructural homogeneity in metal-matrix composites developed under high-pressure-double-torsion [J]. Material Characterization, 2015, 104: 92-100. [6] SHINDO Y, NARITA F, MIKAMI M. Double......
