The Experts below are selected from a list of 25230 Experts worldwide ranked by ideXlab platform

Wolfgang Bleck - One of the best experts on this subject based on the ideXlab platform.

  • Delayed Cracking Behavior of a meta-stable austenitic stainless steel under bending condition
    Materials Science and Engineering: A, 2019
    Co-Authors: Xiaofei Guo, Junhe Lian, Sebastian Münstermann, Wolfgang Bleck
    Abstract:

    Abstract The delayed Cracking Behavior of a meta-stable austenitic stainless steel AISI 301 under bending condition has been investigated at different temperatures, hydrogen contents and external holding forces. The results reveal that the investigated material with an initial hydrogen content of 1 ppm has good bendability at the temperature range between −20 °C and room temperature, which is not susceptible to delayed Cracking in atmospheric condition. When the material is pre-charged with 50 ppm hydrogen, the material still shows good bendability. However, it is susceptible to delayed Cracking under an external holding force during interrupted bending test. By the measurement of martensitic transformation, the simulation of the stress/strain distributions in the bending specimens and the characterization of fracture surfaces, the effects of hydrogen, stress state and external holding force on delayed Cracking Behavior have been assessed.

Alessandro Morbi - One of the best experts on this subject based on the ideXlab platform.

  • the effect of fiber orientation on the post Cracking Behavior of steel fiber reinforced concrete under bending and uniaxial tensile tests
    Cement & Concrete Composites, 2018
    Co-Authors: Antonio Mudadu, Giuseppe Tiberti, Federica Germano, Giovanni Plizzari, Alessandro Morbi
    Abstract:

    Abstract The present paper deals with an experimental study on the post-Cracking tensile Behavior of Steel Fiber Reinforced Concrete (SFRC). In this regard, a broad experimental campaign based on Uniaxial Tensile Tests (UTTs) on notched cylinders as well as three point bending tests (3 PBTs) on notched beams was carried out. Based on the experimental results, the benefits offered by the addition of fiber in the post-Cracking Behavior was deeply studied: fibers increase the toughness of concrete and the ultimate crack width. The uniaxial post-Cracking tensile laws of SFRCs were directly obtained by UTTs and indirectly retrieved by 3 PBTs by performing an inverse analysis procedure. In the latter case the fracture energy was generally higher. It was proven that there is a strongly dependency of the SFRC post-Cracking performance with the fiber distribution and orientation that was measured by means of image-analysis technique.

Gregory E. Maes - One of the best experts on this subject based on the ideXlab platform.

  • Cracking Behavior and mechanical properties of austenitic stainless steel parts produced by laser metal deposition
    Materials & Design, 2013
    Co-Authors: Marleenl Rombouts, Gregory E. Maes
    Abstract:

    Abstract The Cracking Behavior, microstructure and mechanical properties of austenitic stainless steel parts produced by laser metal deposition (LMD) are presented. The existing criteria for evaluating the solidification Cracking sensitivity during welding of stainless steels have been adapted. Apart from the presence of sulfur and phosphorous, the presence of silicon was found to have a detrimental effect on Cracking resistance. Cracking was not observed if the total content of sulfur, phosphorous and silicon was kept low enough, even not for stainless steels with austenitic solidification mode. Three-dimensional parts produced using optimal process parameters and feedstock powder composition have been investigated in more detail. The parts have a density of 99.6%. The microstructure consists of fine columnar dendrites, which coarsen as a function of height along the building direction. This is accompanied by a decrease in hardness. The tensile strength and elongation are in general higher than for annealed wrought material. The tensile strengths are higher while the elongation is lower for samples loaded perpendicular to the build-up direction than for those loaded parallel.

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

  • effect of ac on stress corrosion Cracking Behavior and mechanism of x80 pipeline steel in carbonate bicarbonate solution
    Corrosion Science, 2014
    Co-Authors: Min Zhu, Zhiyong Liu, Dawei Zhang
    Abstract:

    Abstract The influence of various AC current densities on stress corrosion Cracking Behavior and mechanism of X80 pipeline steel was investigated in carbonate/bicarbonate solution by polarization curves and slow strain rate tensile tests. With the increasing AC current density, the SCC susceptibility of the steel increases, especially at high AC current density. A significant difference in the SCC Behavior and mechanism is found for the steels with or without AC application. In the absence of AC, the fracture mode is intergranular and the mechanism is attributed to anodic dissolution. Under AC application, the cracks propagation is transgranular, and the mechanism is mixed controlled by both anodic dissolution and hydrogen embrittlement.

Joaquim A. O. Barros - One of the best experts on this subject based on the ideXlab platform.

  • Assessment of different methods for characterization and simulation of post-Cracking Behavior of self-compacting steel fiber reinforced concrete
    Construction and Building Materials, 2019
    Co-Authors: Fatemeh Soltanzadeh, Vitor M. C. F. Cunha, Joaquim A. O. Barros
    Abstract:

    Abstract The post-Cracking tensile properties of steel fiber reinforced concrete (SFRC) is one of the most important aspects that should be considered in design of SFRC structural members. The parameters that describe the post-Cracking Behavior of SFRC in tension are often derived using indirect methods combined with inverse analysis techniques applied to the results obtained from three- or four-point prism bending tests or from determinate round panel tests. However, there is still some uncertainty regarding the most reliable methodology for evaluating the post-Cracking Behavior of SFRC. In the present study a steel fiber reinforced self-compacting concrete (SFRSCC) was developed and its post-Cracking Behavior was investigated through an extensive experimental program composed of small determinate round panel and prism bending tests. Based on the results obtained from this experimental program, the constitutive tensile laws of the developed SFRSCC were obtained indirectly using two numerical approaches, as well as three available analytical approaches based on standards for estimating the stress versus crack width relationship ( σ - w ). The predictive performance of both the numerical and analytical approaches employed for estimating the σ - w relationship of the SFRSCC was assessed. The numerical simulations have provided a good prediction of the post-Cracking Behavior of the concrete. All the analytical formulations also demonstrated an acceptable accuracy for design purposes. Anyhow, among all the employed approaches, the one that considers the results of small determinate round panel tests (rather than that of prism bending tests) has predicted more accurately the constitutive tensile laws of the SFRSCC.