The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform

Nizamettin Kahraman - One of the best experts on this subject based on the ideXlab platform.

  • the influence of welding parameters on the joint Strength of resistance spot welded titanium sheets
    Materials & Design, 2007
    Co-Authors: Nizamettin Kahraman
    Abstract:

    In this study, commercially pure (CP) titanium sheets (ASTM Grade 2) were welded by resistance spot welding at different welding parameters and under different welding environments. The welded joints were subjected to tensile-Shearing tests in order to determine the Strength of the welded zones. In addition, hardness and microstructural examinations were carried out in order to examine the influence of welding parameters on the welded joints. The results showed that increasing current time and electrode force increased the tensile Shearing Strength and the joints obtained under the argon atmosphere gave better tensile-Shearing Strength. Hardness measurement results indicated that welding nugget gave the highest hardness and the heat affected zone (HAZ) and the base metal followed this. The argon gas used during the welding process was seen to have no influence on the hardness values. Microstructural examinations revealed that the deformations took place in the welding zone during welding. The twinning took place in the grains. High electrode force and high weld cycles, were used during the welding, increased the twinning.

H.m. Wang - One of the best experts on this subject based on the ideXlab platform.

  • Study on the technology of explosive welding incoloy800-SS304
    Journal of Materials Engineering and Performance, 2011
    Co-Authors: Hui Zhao, Pingcang Li, Yinggang Zhou, Zhanghong Huang, H.m. Wang
    Abstract:

    In this article, Incoloy800 and SS304 (304 stainless steel) were cladded by explosive welding. Accordingly, micro-hardness, tensile Strength, Shearing Strength, bending properties, and SEM microstructure of cladding plate were examined in detail. The bonding interface of the plate showed a wavy morphology. Whereas, a different colorful area was observed at the wave ridge of the base layer either in optical or SEM pictures. Magnetic inspection showed that the colorful area was austenitic steel. Thus, the occurrence of the colorful areas seemed to be the result from the high deformation/cold working of the grains. EDX spectrum analysis and line scanning indicated that the diffusion through the bonding interface was not observed under the EDX and line scanning detection limitation. Micro-hardness, tensile, Shearing, and bending testing results showed that the bonding Strength was acceptable according to ASTM specification.

  • An investigation on Incoloy800-SS304 clad plate by explosive welding
    International Journal of Materials Research, 2010
    Co-Authors: Hui Zhao, Pingcang Li, Zhanghong Huang, Yigang Zhou, H.m. Wang
    Abstract:

    In this paper, Incoloy800 and 304 stainless steel (SS304) were clad by explosive welding. Accordingly, hardness, tensile Strength, Shearing Strength, bending properties and microstructure of the clad plates were evaluated. The bond- ing interface showed a wavy morphology. Line scanning re- sults indicated that there was no diffusion area through the bonding interface. Whereas, a colorful zone was observed at the wave ridge of the base metal (white area in optical microscopy and black area in scanning electronic micro- scopy). Energy dispersive spectroscopy analysis indicated that compositions and contents of the colorful zone were the same as that in the base metal. Hardness testing showed that the highest value of hardness was obtained in the color- ful zone. Thus, the colorful zone was an intensive deforma- tion area in SS304, which was produced by shock pressure from collision. Mechanical tests showed that the clad plate was acceptable according to ASTMspecification.

Chingjiang Jeng - One of the best experts on this subject based on the ideXlab platform.

  • a case study on the in situ matrix suction monitoring and undisturbed sample laboratory test for the unsaturated colluvium slope
    Soils and Foundations, 2011
    Co-Authors: Chingjiang Jeng
    Abstract:

    Huafan University is located on the slope of the Ta-Lun Mountain area. The slope surface in this area is a colluvium soil cover layer with loose non-uniform particles, with high permeability. Because it is situated above a rapidly changing water table, the pore water pressure varies dynamically, depending on the weather conditions. In the dry season, most of the topsoil behaves in the unsaturated condition such that the matrix suction in the soil increases its Shearing Strength. In contrast, when heavy rainfall occurs, the seepage by precipitation tends to destroy the existing matrix suction. This reduction in soil Strength frequently results in slope failure. This study, focuses on the variation of matrix suction of the colluvium soil in different precipitation conditions with varying vegetation at the campus of Huafan University. The analysis of the in-situ monitoring results and the laboratory test results for the undisturbed specimens taken from the field, with Shearing Strength and matrix suction taken into account. It is expected the results to be a useful reference for disaster protection on slopes.

Todd F Shupe - One of the best experts on this subject based on the ideXlab platform.

  • laminating wood fiber mats into a densified material with high performance
    Materials Letters, 2019
    Co-Authors: Yahui Zhang, Wenji Yu, Todd F Shupe
    Abstract:

    Abstract To develop high-performance wood materials, a novel preparation strategy is presented in this study. Wood fiber mats impregnated with phenolic resin, were laminated into a densified material. Wood lumens collapsed layer by layer during densification, leading to a compact multi-layered structure. The densified material had excellent mechanical properties and favorable water resistance. The flexural, compressive, and short-beam Shearing Strength were approximately 230%, 400%, and 260% higher than that of natural wood, respectively. The water absorption rate and thickness swelling rate in boiled water were 19% and 5.7%, respectively. Surface water repellency was also enhanced due to reduction of hydrophilic groups on the surface. Such high performance makes the material a promising candidate for advanced engineering structures and applications.

Zhang Zeng-ping - One of the best experts on this subject based on the ideXlab platform.

  • Effects of soft buffer layer on the mechanical properties of T300/BADCy composite
    Journal of Aeronautical Materials, 2020
    Co-Authors: Zhang Zeng-ping
    Abstract:

    The surface of T300 fiber was treated by epoxy resin E51-acton solution to improve the interface properties of the T300/BADCy composites. A soft buffer layer of oxazolidinone was formed on the surface of T300 fiber as the BADCy resin reacted with the epoxy resin coating there. The mechanism of the reaction between BADCy resin and epoxy resin was studied by FTIR. Influences on the mechanical properties of T300/BADCy composite by treatable solution of different concentration were compared. When the concentration of the treatable solution was 5wt%, inter-laminar Shearing Strength of T300/BADCy composite could be raised by 16%; the flexural Strength was also increased by 4%. When the concentration of the treatable solution was 5wt%, the ILSS and flexural Strength of T300/BADCy was descended. The Shearing fracture images of T300/BADCy composite with or without treated by epoxy resin E51-acton solution were studied by SEM. It was found that there were some cracks and gaps in the interface of untreated T300/BADCy composite,few cracks and gaps exist in the treated T300/BADCy composite fracture, and the break was mainly occurred inside the resins.