The Experts below are selected from a list of 201 Experts worldwide ranked by ideXlab platform

Lander Barrenetxea - One of the best experts on this subject based on the ideXlab platform.

  • Framework for verification of Positional Tolerances with a 3D non-contact measurement method
    International Journal on Interactive Design and Manufacturing (IJIDeM), 2016
    Co-Authors: Rikardo Minguez, Agustin Arias, Olatz Etxaniz, Eneko Solaberrieta, Lander Barrenetxea
    Abstract:

    New methods of data acquisition such as 3D scanners have become increasingly necessary for the verification of the geometric dimensioning and tolerancing (GD&T) specifications in the manufacture of industrial parts. This paper proposes a method for the verification of a Positional Tolerance in two cylindrical features in an industrial part digitized using a 3D non-contact scanner. Apart from enabling an adequate quantification of the obtained results, this method also permits the displaying of different ways of visualizing the results. The Tolerance zone within which the used scanner carries out the analysis was measured and quantified. Some aspects taken into consideration were the geometric quality of the piece and the repeatability, the reproducibility and the uncertainty of the digital process, which comprises the acquisition and processing of the data. This research work concludes that the digital method presented hereby, with its corresponding virtual inspection, is valid for the verification of Positional Tolerances, even when it is required to maintain the GD&T specification regardless of the feature size. In addition, this article raises the discussion over the best way to compute the traditional datum referencing rules to the new data acquisition methods.

Ya-wen Wang - One of the best experts on this subject based on the ideXlab platform.

R.c. Wimpory - One of the best experts on this subject based on the ideXlab platform.

  • Development of procedures for the measurement of residual stress by neutron diffraction
    Applied Physics A, 2002
    Co-Authors: G.a. Webster, R.c. Wimpory
    Abstract:

    Neutron diffraction is a non-destructive method for determining residual stresses in crystalline materials. It is a relatively new technique and no standard is currently available for making these measurements. This paper gives the background to research that has been carried out to develop a standard. It outlines the main findings and indicates the precautions that are required to achieve accurate positioning and alignment of specimens (and components) in a neutron beam and the analysis required to obtain reliable results. It also shows that special attention is needed in dealing with near-surface measurements because of surface aberration. It is demonstrated that, provided the recommended procedures are followed, a Positional Tolerance of ±0.1 mm can be achieved with an accuracy in strain of ∼10^-4, to give a resolution in residual stress of ∼7 to 20 MPa in most materials of practical interest.

  • Draft Standard for the Measurement of Residual Stresses by Neutron Diffraction
    Recent Advances in Experimental Mechanics, 2002
    Co-Authors: G.a. Webster, A. G. Youtsos, Carsten Ohms, R.c. Wimpory
    Abstract:

    Residual stresses can have important consequences for the load carrying capacity and safety of engineering components. Neutron diffraction is a non-destructive method for determining residual stresses in crystalline materials. It is a relatively new technique and no standard is currently available for making these measurements. This paper gives the background to research that has been carried out to develop a standard. It outlines the main findings and indicates the precautions that are required to achieve accurate positioning and alignment of specimens (and components) in a neutron beam and the analysis required to obtain reliable results. It also shows that special attention is needed in dealing with near-surface measurements because of surface aberration. It is demonstrated that, provided the recommended procedures are followed, a Positional Tolerance of ±0.1mm can be achieved with an accuracy in strain of ±10−4 to give a resolution in residual stress of ±7 to 20 MPa in most materials of practical interest.

Rikardo Minguez - One of the best experts on this subject based on the ideXlab platform.

  • Framework for verification of Positional Tolerances with a 3D non-contact measurement method
    International Journal on Interactive Design and Manufacturing (IJIDeM), 2016
    Co-Authors: Rikardo Minguez, Agustin Arias, Olatz Etxaniz, Eneko Solaberrieta, Lander Barrenetxea
    Abstract:

    New methods of data acquisition such as 3D scanners have become increasingly necessary for the verification of the geometric dimensioning and tolerancing (GD&T) specifications in the manufacture of industrial parts. This paper proposes a method for the verification of a Positional Tolerance in two cylindrical features in an industrial part digitized using a 3D non-contact scanner. Apart from enabling an adequate quantification of the obtained results, this method also permits the displaying of different ways of visualizing the results. The Tolerance zone within which the used scanner carries out the analysis was measured and quantified. Some aspects taken into consideration were the geometric quality of the piece and the repeatability, the reproducibility and the uncertainty of the digital process, which comprises the acquisition and processing of the data. This research work concludes that the digital method presented hereby, with its corresponding virtual inspection, is valid for the verification of Positional Tolerances, even when it is required to maintain the GD&T specification regardless of the feature size. In addition, this article raises the discussion over the best way to compute the traditional datum referencing rules to the new data acquisition methods.

Yu Peng - One of the best experts on this subject based on the ideXlab platform.