Papers by Keyword: Compressive Property

Abstract: Additive manufacturing (AM) has gained significant attention as a promising technique for producing complex-shaped components, particularly in the aerospace and biomedical industries. However, post-processing steps, such as heat treatment, can significantly influence the mechanical properties of additively manufactured parts. This research investigates the effect of supertransus heat treatment on the compressive behavior of Ti-6Al-4V (ELI) alloy produced through additive manufacturing. The specimens were subjected to a series of heat treatment cycles, including solution treatment and aging above the β-transus temperature range. Compressive tests were conducted on as-received and heat-treated samples to evaluate their mechanical properties and deformation behavior. Microstructure characterization was performed using optical microscopy (OM) and scanning electron microscopy (SEM). The results revealed that the microstructure of the as-built material primarily consisted of columnar grains and acicular α' martensite. Significant variations in microstructure were observed in heat-treated samples, particularly with changes in the cooling rate. The microstructure changes closely correlated with the compressive properties of the heat-treated samples. The heat-treated samples showed a reduction in compressive strength compared to the as-received samples but exhibited improved elongation behavior. These findings contribute to the broader understanding of post-processing effects on the mechanical properties of additively manufactured materials, enabling the development of high-performance components for various applications.

Abstract: In this study, the open-cell Mg-2Zn-0.4Y foams were prepared by infiltration casting method. The Ni/Mg hybrid foams were prepared by electroless Ni-P coating on the foam struts to improve the compressive strength and energy absorption capacity. The compressive properties of the Mg alloy foams and Ni/Mg hybrid foams were studied by quasi-static compressive test. The experimental results show that the Ni-P coating is composed of crystallites. The Ni-P coating can significantly enhance the compressive strength, energy absorption capacity and energy absorption efficiency of the foams.

Abstract: Closed-cell aluminum foam with different percentages of Cu was prepared by melt foaming method.The effect of Cu element on the quasi-static compressive properties of aluminum foam was investigated, both under as-cast and heat-treated conditions. The results showed that Cu element distributed in cell wall matrix mainly in the forms of Al-Cu solid solutions and AlCu3, Al_6.1Cu_1.2Ti_2.7 intermetallics. Meanwhile, Cu-containing foams possessed much higher compressive strength than the commercially pure aluminum foams. Additionally, proper heat treatment could further improve the yield strength of Cu-containing foams and the effect of aging treatment was more obvious than the homogenizing heat treatment under the present conditions and the reasons were discussed.

Abstract: This paper studies on the frost resistance of high-content fly ash concrete which content 52 fly ash in seawater. The uniaxial compressive property test was carried out after the fast freeze-thaw test with 0, 100, 200, 300 and 400 cycles. The research analyzed the influence of the uniaxial strength of the concrete mixed with high-content fly ash after freeze-thaw cycles in seawater. Then established a mathematical expression in a simple way. In the real project, the concrete mixed with fly ash can improve the frost resistance. The dosage of fly ash will directly influence the frost resistance and mechanical property. However, there is less study on frost resistance of concrete mixed with fly ash, especially the test under the seawater environment.

Abstract: Effects of the compressive rate, specimen dimension, specimen orientation and microstructure on the compressive property at ambient temperature of extruded ZK60-xDy alloy rods were investigated. The results show that the specimen dimension, specimen orientation and microstructure except the compressive rate play a significant role on the compressive property. The compressive strength σ_bc increased significantly by the improving amplitude of 65~110 MPa with increasing the height/diameter ratio h/φ of the cylindrical compressive specimen from 0.5 to 1, however it was not enhanced further as h/φ increased to 2. With increasing the value of h/φ, the yield stage on the compressive curve was strengthened gradually, and meanwhile the compressive macro-fracture changed from the inverted "V" type to pure shear fracture with an angle of 45°. Compared with the specimen whose axial direction was parallel to the transverse direction, σ_bc was enhanced by the improving amplitude of 60~120 MPa for the specimen whose axial direction was parallel to the extrusion direction. When small amount of Dy (0.31%) was added into ZK60 alloy, σ_bc was increased from 500 MPa to 540 MPa. However, it slightly decreased to 515 MPa again when the Dy content increased to 4.32%.

Abstract: In order to achieve function-structure integration and improve mechanical properties and energy absorption capability of the foam aluminum composite,foam aluminum filled with silicone rubber-modified epoxy resin was prepared.Static compression test shows that the platform yield stage of foam aluminum filled with modified epoxy resin is uplifted,the mechanical properties and energy absorption capability of foam aluminum are improved.The results are helpful to expand the application of aluminum foam.

Abstract: Equal channel angular pressing (ECAP) was applied to control the microstructure of AZ31B magnesium alloy. Compression properties of both as-received and grain refined AZ31B alloy were investigated under quasi-static and dynamic loadings. The yield strength, ultimate strength, failure strain and flow stress under compression loading were studied. Both the as-received alloy and ECAPed alloy show strong strain rate sensitivity. Grain size, texture and strain rate jointly affect the deformation mechanisms. Through fractography analysis, the fracture mechanism was analyzed.

Abstract: In this paper, an unconsolidated conical bearing composed of PTFE and natural rubber is introduced. Experimental study on compressive property of unconsolidated conical bearings is conducted. Origin vertical stiffness and standard vertical stiffness of unconsolidated conical bearings are calculated. The sinusoidal shaking table tests study on a 5-story steel frame isolated structure with unconsolidated conical bearings containing polyurethane damping material or not are carried out. The results show that the unconsolidated conical bearing has good capacity of dissipating energy under pure compressive loading. The amplification coefficient of structural response with unconsolidated conical bearings containing polyurethane is approximately 1.3 and that without polyurethane is approximately 1.8. Energy dissipation structures with the new unconsolidated conical bearings in shock absorption are better than traditional structures.

Abstract: The compressive properties of mineral composite material (MCM) are simulated by finite element (FE) method. A meso-scale 2D FE model for MCM specimen was established based on the real shapes of aggregates and their distributions in the matrix. Quasi-static compressive load was then exerted on the model, supposing no debonding exists between the matrix and aggregates and no failure occurs on their interfaces. Comparing the simulation with experimental results, it is found that the simulated stress-strain curve agrees well with the experimental one. It proved that the way for simulating compressive properties of MCM in this paper is very effective.

Abstract: In order to solve the strength matching problem of grouted concrete and block in mortarless grouted masonry, the article adopts the ANSYS nonlinear simulation to establish different strength grade models. And the result shows that, when the strength matching relationship between the mortarless block and the concrete reaches f_c/f_b=1~2, the grouted concrete and block compressive strength are brought into full play without material waste. The result is close to f_cu/f_cb = 1.5~3.5 (gross area) from the literature^[1]. It is clear that, when the compressive strength of the two is close, their joint work can exert the best effects. It fits the experimental results and provides reference to the application of mortarless grouted block.