The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform

Giovanni Meneghetti - One of the best experts on this subject based on the ideXlab platform.

  • analysis of Crack geometry and location in notched bars by means of a three probe potential drop technique
    International Journal of Fatigue, 2019
    Co-Authors: Alberto Campagnolo, Giovanni Meneghetti
    Abstract:

    Abstract It is often necessary to define the Crack initiation life of a fatigue tested component, generally at a given (short) Crack length. The size of an Initiated Crack can be estimated by employing different experimental methods, one of which is the direct current potential drop (DCPD) technique. In the case of notched bars subjected to fatigue loadings, the Crack configuration (i.e. circumferential or semi-elliptical) and location cannot be singled out by means of the potential drop method (PDM) operating with a single potential probe. In the present contribution, three potential probes are adopted to overcome this issue. The calibration curves reporting the three potential drops as a function of the Crack size are derived by means of 3-dimensional electrical FE analyses. Two different Crack configurations are analyzed: (i) circumferential and (ii) semi-elliptical surface Cracks. The calibration curves have been validated by systematic comparison with experimental results, generated by fatigue testing of sharp as well as blunt notched specimens made of steel and a titanium alloy under pure axial loading. Finally, a procedure to assess the area, the configuration and the location of the Initiated fatigue Crack starting from the experimentally measured potential drops is discussed.

Alberto Campagnolo - One of the best experts on this subject based on the ideXlab platform.

  • analysis of Crack geometry and location in notched bars by means of a three probe potential drop technique
    International Journal of Fatigue, 2019
    Co-Authors: Alberto Campagnolo, Giovanni Meneghetti
    Abstract:

    Abstract It is often necessary to define the Crack initiation life of a fatigue tested component, generally at a given (short) Crack length. The size of an Initiated Crack can be estimated by employing different experimental methods, one of which is the direct current potential drop (DCPD) technique. In the case of notched bars subjected to fatigue loadings, the Crack configuration (i.e. circumferential or semi-elliptical) and location cannot be singled out by means of the potential drop method (PDM) operating with a single potential probe. In the present contribution, three potential probes are adopted to overcome this issue. The calibration curves reporting the three potential drops as a function of the Crack size are derived by means of 3-dimensional electrical FE analyses. Two different Crack configurations are analyzed: (i) circumferential and (ii) semi-elliptical surface Cracks. The calibration curves have been validated by systematic comparison with experimental results, generated by fatigue testing of sharp as well as blunt notched specimens made of steel and a titanium alloy under pure axial loading. Finally, a procedure to assess the area, the configuration and the location of the Initiated fatigue Crack starting from the experimentally measured potential drops is discussed.

Meneghetti Giovanni - One of the best experts on this subject based on the ideXlab platform.

  • Calibration of the potential drop method by means of electric FE analyses and experimental validation for a range of Crack shapes
    Wiley, 2018
    Co-Authors: Campagnolo Alberto, Meneghetti Giovanni, Berto Filippo, Keisuke Ke Tanaka
    Abstract:

    In experimental fatigue tests, it may be necessary to identify the onset of Crack initiation, which is often defined at a given (short) Crack length. Different experimental techniques are available to estimate the Initiated Crack size, one of which is the direct current potential drop technique. In this paper, the calibration curves reporting the potential drop change as a function of the Crack depth have been derived by means of 3D electrical finite element analyses. Driven by previous experimental observations, two different Crack shapes have been considered: (i) circumferential and (ii) semi‐elliptical surface Cracks. Dealing with circumferential Cracks, the effects of the three‐dimensional distribution of the electric current density and the temperature have been investigated. Concerning semi‐elliptical surface Cracks, the effects of the Crack aspect ratio and the potential probes locations have been analysed. Finally, the obtained calibration curves have been validated against experimental measurements, obtained by fatigue testing notched specimens under a selection of loading conditions.submittedVersionThis is the pre-peer reviewed version of an article, which has been published in final form at [https://doi.org/10.1111/ffe.12856]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving

  • Calibration of the potential drop method by means of electric FE analyses and experimental validation for a range of Crack shapes
    'Royal College of Obstetricians & Gynaecologists (RCOG)', 2018
    Co-Authors: Campagnolo Alberto, Meneghetti Giovanni, Berto Filippo, Keisuke Ke Tanaka
    Abstract:

    In experimental fatigue tests, it may be necessary to identify the onset of Crack initiation, which is often defined at a given (short) Crack length. Different experimental techniques are available to estimate the Initiated Crack size, one of which is the direct current potential drop technique. In this paper, the calibration curves reporting the potential drop change as a function of the Crack depth have been derived by means of 3D electrical finite element analyses. Driven by previous experimental observations, two different Crack shapes have been considered: (i) circumferential and (ii) semi‐elliptical surface Cracks. Dealing with circumferential Cracks, the effects of the three‐dimensional distribution of the electric current density and the temperature have been investigated. Concerning semi‐elliptical surface Cracks, the effects of the Crack aspect ratio and the potential probes locations have been analysed. Finally, the obtained calibration curves have been validated against experimental measurements, obtained by fatigue testing notched specimens under a selection of loading conditions

  • Crack initiation life of titanium notched bars under uniaxial and multiaxial fatigue: calibration analysis of the potential drop method and experimental validation
    2018
    Co-Authors: Campagnolo Alberto, Berto Filippo, Berton Giovanni, Meneghetti Giovanni
    Abstract:

    During experimental fatigue tests it may be necessary to monitor the Crack initiation instant, that is often referred to a short Crack depth. Several methods exist to assess the Initiated Crack size, the direct current potential drop (DCPD) technique being one of them. In the present contribution, the calibration curves representing the potential drop change as a function of the Crack depth are derived from 3D electrical FE analyses. Based on previous experimental observations, two different Crack shapes are considered: (i) circumferential and (ii) semi-elliptical surface. In the case of semi-elliptical Cracks, the effects of the Crack aspect ratio and the location of the potential probes are investigated in detail. In conclusion, the numerically-derived calibration curves are experimentally validated on the basis of measurements carried out on notched specimens fatigue tested under different loadings

Campagnolo Alberto - One of the best experts on this subject based on the ideXlab platform.

  • Calibration of the potential drop method by means of electric FE analyses and experimental validation for a range of Crack shapes
    Wiley, 2018
    Co-Authors: Campagnolo Alberto, Meneghetti Giovanni, Berto Filippo, Keisuke Ke Tanaka
    Abstract:

    In experimental fatigue tests, it may be necessary to identify the onset of Crack initiation, which is often defined at a given (short) Crack length. Different experimental techniques are available to estimate the Initiated Crack size, one of which is the direct current potential drop technique. In this paper, the calibration curves reporting the potential drop change as a function of the Crack depth have been derived by means of 3D electrical finite element analyses. Driven by previous experimental observations, two different Crack shapes have been considered: (i) circumferential and (ii) semi‐elliptical surface Cracks. Dealing with circumferential Cracks, the effects of the three‐dimensional distribution of the electric current density and the temperature have been investigated. Concerning semi‐elliptical surface Cracks, the effects of the Crack aspect ratio and the potential probes locations have been analysed. Finally, the obtained calibration curves have been validated against experimental measurements, obtained by fatigue testing notched specimens under a selection of loading conditions.submittedVersionThis is the pre-peer reviewed version of an article, which has been published in final form at [https://doi.org/10.1111/ffe.12856]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving

  • Calibration of the potential drop method by means of electric FE analyses and experimental validation for a range of Crack shapes
    'Royal College of Obstetricians & Gynaecologists (RCOG)', 2018
    Co-Authors: Campagnolo Alberto, Meneghetti Giovanni, Berto Filippo, Keisuke Ke Tanaka
    Abstract:

    In experimental fatigue tests, it may be necessary to identify the onset of Crack initiation, which is often defined at a given (short) Crack length. Different experimental techniques are available to estimate the Initiated Crack size, one of which is the direct current potential drop technique. In this paper, the calibration curves reporting the potential drop change as a function of the Crack depth have been derived by means of 3D electrical finite element analyses. Driven by previous experimental observations, two different Crack shapes have been considered: (i) circumferential and (ii) semi‐elliptical surface Cracks. Dealing with circumferential Cracks, the effects of the three‐dimensional distribution of the electric current density and the temperature have been investigated. Concerning semi‐elliptical surface Cracks, the effects of the Crack aspect ratio and the potential probes locations have been analysed. Finally, the obtained calibration curves have been validated against experimental measurements, obtained by fatigue testing notched specimens under a selection of loading conditions

  • Crack initiation life of titanium notched bars under uniaxial and multiaxial fatigue: calibration analysis of the potential drop method and experimental validation
    2018
    Co-Authors: Campagnolo Alberto, Berto Filippo, Berton Giovanni, Meneghetti Giovanni
    Abstract:

    During experimental fatigue tests it may be necessary to monitor the Crack initiation instant, that is often referred to a short Crack depth. Several methods exist to assess the Initiated Crack size, the direct current potential drop (DCPD) technique being one of them. In the present contribution, the calibration curves representing the potential drop change as a function of the Crack depth are derived from 3D electrical FE analyses. Based on previous experimental observations, two different Crack shapes are considered: (i) circumferential and (ii) semi-elliptical surface. In the case of semi-elliptical Cracks, the effects of the Crack aspect ratio and the location of the potential probes are investigated in detail. In conclusion, the numerically-derived calibration curves are experimentally validated on the basis of measurements carried out on notched specimens fatigue tested under different loadings

Keisuke Ke Tanaka - One of the best experts on this subject based on the ideXlab platform.

  • Calibration of the potential drop method by means of electric FE analyses and experimental validation for a range of Crack shapes
    Wiley, 2018
    Co-Authors: Campagnolo Alberto, Meneghetti Giovanni, Berto Filippo, Keisuke Ke Tanaka
    Abstract:

    In experimental fatigue tests, it may be necessary to identify the onset of Crack initiation, which is often defined at a given (short) Crack length. Different experimental techniques are available to estimate the Initiated Crack size, one of which is the direct current potential drop technique. In this paper, the calibration curves reporting the potential drop change as a function of the Crack depth have been derived by means of 3D electrical finite element analyses. Driven by previous experimental observations, two different Crack shapes have been considered: (i) circumferential and (ii) semi‐elliptical surface Cracks. Dealing with circumferential Cracks, the effects of the three‐dimensional distribution of the electric current density and the temperature have been investigated. Concerning semi‐elliptical surface Cracks, the effects of the Crack aspect ratio and the potential probes locations have been analysed. Finally, the obtained calibration curves have been validated against experimental measurements, obtained by fatigue testing notched specimens under a selection of loading conditions.submittedVersionThis is the pre-peer reviewed version of an article, which has been published in final form at [https://doi.org/10.1111/ffe.12856]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving

  • Calibration of the potential drop method by means of electric FE analyses and experimental validation for a range of Crack shapes
    'Royal College of Obstetricians & Gynaecologists (RCOG)', 2018
    Co-Authors: Campagnolo Alberto, Meneghetti Giovanni, Berto Filippo, Keisuke Ke Tanaka
    Abstract:

    In experimental fatigue tests, it may be necessary to identify the onset of Crack initiation, which is often defined at a given (short) Crack length. Different experimental techniques are available to estimate the Initiated Crack size, one of which is the direct current potential drop technique. In this paper, the calibration curves reporting the potential drop change as a function of the Crack depth have been derived by means of 3D electrical finite element analyses. Driven by previous experimental observations, two different Crack shapes have been considered: (i) circumferential and (ii) semi‐elliptical surface Cracks. Dealing with circumferential Cracks, the effects of the three‐dimensional distribution of the electric current density and the temperature have been investigated. Concerning semi‐elliptical surface Cracks, the effects of the Crack aspect ratio and the potential probes locations have been analysed. Finally, the obtained calibration curves have been validated against experimental measurements, obtained by fatigue testing notched specimens under a selection of loading conditions