The effects of spin friction pressure and time on the friction welding between parts of the same material and different materials are discussed. The heat‐affected zone is divided into three regions: the plasticized region (Zpl), the partly plasticized region (Zpd), and the undeformed region (Zud). The tensile fracture morphology has three sections: the non‐plasticized central section (Fud), the plasticized peripheral section (Fpl), and the partly plasticized section between Fud and Fpl (Fpd). Friction pressure (spinning timing): 0.784 Mpa (6 seconds), 0.981 MPa (8 seconds and 10 seconds) in PMMA‐PMMA welding, 0.588 Mpa (10 seconds) in PVC‐PVC welding, and 15.7 MPa (15 seconds) in PMMA‐PVC welding attains better bonding strength, because these parts have larger Fpd and Fpl regions, which have no Fud in the central part.
ABSTRACT:The effects of spin-friction pressure and timing on the friction welding between parts of the same materials, PP, HDPE, and nylon-6, are discussed. The heataffected zone is divided into three regions: the plasticized region (Zpl), the partly plasticized region (Zpd), and the undeformed region (Zud). The tensile fracture morphology has three main sections: the nonplasticized central section (Fud), the plasticized peripheral section (Fpl), and the partly plasticized section between Fud and Fpl (Fpd). Friction pressures (spinning timing) of 1.17 MPa (16 s) in PP-PP welding, 1.77 MPa (8 s) in HDPE-HDPE welding, and 0.98 MPa (8, 10, and 12 s) in nylon-6 -nylon-6 welding attains better bonding strength because their components have larger Fpd and Fpl regions, which have no Fud in the central part.
The same batch reactive powder concrete specimens were obtained with same raw materials and curing process, uniaxial compressive strength test had been done on the specimens after hot water curing placed in laboratory for seven days , three months and three years. The test results showed that seven-day strength and three-month strength of plain reactive powder concrete after hot water curing are almost equal. Strength of plain reactive powder concrete has not degradation within three months after hot water curing. While strength of plain reactive powder appears serious degradation phenomenon after placed in Laboratory for three years. Comparing uniaxial compressive strength test results of plain reactive powder concrete at three-month with three-year after hot water curing ,we find that strength of plain reactive concrete at three-year decrease about 27 percent than the strength of plain reactive powder concrete placed at laboratory for three months, and elasticity modulus increases about 71 percent, axial peak strain decrease about 62 percent respectively .With the passage of time, plain reactive powder concrete appears more Brittle Features and less toughness.
Through uniaxial compression test, tensile splitting test and bending test, we have researched the three kinds basic mechanical behaviors of Reactive Powder Concrete (RPC for short) with different steel fiber volume contents at 0%, 1%, 2% and 4% respectively. According to the result, the tensile splitting strength is a linear increase nearly with the increase of steel fiber volume content; and the bending strength is also increase with the increase of steel fiber volume content, When steel fiber volume content increases from 1% to 2%, the growing rate of bending strength reaches to maximum. When steel fiber volume content is within 4%, the compressive strength increases with the increase of steel fiber volume content. The compressive strength of plain RPC can reach to 135MPa, and the RPC with 4% steel fiber volume content is about 220MPa. This information can tell us that the addition of steel fiber in RPC can get an great increase of strength and toughness.
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