The Experts below are selected from a list of 108 Experts worldwide ranked by ideXlab platform

Matias R. Viotti - One of the best experts on this subject based on the ideXlab platform.

  • Residual Stress Measurements in steel pipes using DSPI and the hole-drilling technique
    International Journal of Pressure Vessels and Piping, 2017
    Co-Authors: Livia R. Lothhammer, Matias R. Viotti, Armando Albertazzi, Celso L. N. Veiga
    Abstract:

    Abstract The oil and gas industry employs long distance pipelines to simplify the transport logistic and to reduce the final costs of petroleum derivatives. For the construction of pipelines, nowadays it is usual the application of pipes which are manufactured by cold forming operations. The high level of the non-uniform plastic deformation of the steel during the pipe manufacturing process produces Residual Stresses. These Stresses are internally self-equilibrated, but locally can affect the structural integrity of the pipeline. Therefore, an accurate Measurement of Residual Stresses is important to guarantee a safe and healthy pipeline network. This paper shows the application of a portable optical device combining digital speckle pattern interferometry and the hole drilling technique to Measure Residual Stress fields in pipe samples manufactured by the UOE-SAW and ERW processes. A set of 72 Measurements were performed in order to scan the Residual Stress distribution along the external surface of each pipe. On the other hand, a smaller set of Measurements were performed in the internal surface of an ERW pipe sample. Considering all cases, the mapping has revealed the presence of Stress profiles which were compressive in the first half of the hole and tensile in the second one. Additionally, the external Measurements demonstrated a good repeatability between them, indicating a similar Stress behavior along the circumferential and longitudinal directions of the pipe.

  • compact sensor combining digital speckle pattern interferometry and the hole drilling technique to Measure nonuniform Residual Stress fields
    Optical Engineering, 2013
    Co-Authors: Matias R. Viotti, Armando Albertazzi
    Abstract:

    A portable device to essentially Measure Residual Stress fields outside an optical bench is presented. This system combines the hole-drilling technique with digital speckle pattern interferometry. A novel feature of this device is its high degree of compaction since only one base supports simultaneously the Measurement module and the hole-drilling device. A new version of the American society for testing and materials standard E837 for the Measurement of Residual Stresses has been improved including a computation method for nonuniform Residual Stresses. According to this standard, a hole with a maximum depth of 1.0 mm should be introduced into the material to assess the Stress distribution along the hole’s depth. The discretization of the Stress distribution is performed in 20 equal steps of 0.05 mm, getting the deformations generated for Stress relief in every drilling step. A description of the compact device showing the solution for a fast and easy interchanging process between modules is also presented. The proposed system was compared with a traditional method using strain gages, and a good agreement was shown between Stress distributions Measured with both methods. Finally, the portable device was used to evaluate the Residual Stress distribution in a sample with a rod welded by friction hydro pillar processing.

  • compact sensor combining dspi and the hole drilling technique to Measure non uniform Residual Stress fields
    SPECKLE 2012: V International Conference on Speckle Metrology : 10-12 september 2012 : Vigo Spain 2012 ISBN 9780819490902, 2012
    Co-Authors: Matias R. Viotti, Armando Albertazzi
    Abstract:

    This paper presents a portable device to essentially Measure Residual Stress fields outside the optical bench. This system combines the hole drilling technique with Digital Speckle Pattern Interferometry (DSPI). The novel feature of this device is its high degree of compaction since only one base supports simultaneously the Measurement module and the holedrilling device. A new version of the ASTM E837 standard for the Measurement of Residual Stresses has been improved including the computation method for non-uniform Residual Stresses. According to this standard, a hole with depth of 1.0 mm should be introduced into the material to assess the Stress distribution. The discretization of the Stress distribution along the hole depth is performed in 20 equal steps of 0.05 mm, getting the deformations generated for Stress relief in every drilling step. A description of the compact device showing the solution for a fast and easy interchanging process between modules is performed in this paper. The proposed system is used to evaluate the Residual Stress distribution into a sample with a rod welded by friction hydro pillar processing (FHPP)

  • experimental comparison between a portable dspi device with diffractive optical element and a hole drilling strain gage combined system
    Optics and Lasers in Engineering, 2008
    Co-Authors: Matias R. Viotti, Armando Albertazzi, Walter A Kapp
    Abstract:

    This paper presents a portable device to Measure Residual Stress fields outside the optical bench. This system combines the hole drilling technique with digital speckle pattern interferometry. The novel feature of this device is the application of a binary diffractive optical element (DOE) in order to generate double illumination and radial in-plane sensitivity. The use of the DOE ensures constant sensitivity since it only depends on the grating period, having lack of dependence on the wavelength of the illumination source. Descriptions of the DOE and the portable device are followed by the presentation of experimental results showing that the combined system can Measure Residual Stress fields with an uncertainty of 7%. On the other hand, these fields were Measured with the traditional strain gage hole drilling technique. A set of results obtained for a Residual Stress level of 45% of the yield Stress of the material, showed a good agreement between both evaluated systems.

Armando Albertazzi - One of the best experts on this subject based on the ideXlab platform.

  • Residual Stress Measurements in steel pipes using DSPI and the hole-drilling technique
    International Journal of Pressure Vessels and Piping, 2017
    Co-Authors: Livia R. Lothhammer, Matias R. Viotti, Armando Albertazzi, Celso L. N. Veiga
    Abstract:

    Abstract The oil and gas industry employs long distance pipelines to simplify the transport logistic and to reduce the final costs of petroleum derivatives. For the construction of pipelines, nowadays it is usual the application of pipes which are manufactured by cold forming operations. The high level of the non-uniform plastic deformation of the steel during the pipe manufacturing process produces Residual Stresses. These Stresses are internally self-equilibrated, but locally can affect the structural integrity of the pipeline. Therefore, an accurate Measurement of Residual Stresses is important to guarantee a safe and healthy pipeline network. This paper shows the application of a portable optical device combining digital speckle pattern interferometry and the hole drilling technique to Measure Residual Stress fields in pipe samples manufactured by the UOE-SAW and ERW processes. A set of 72 Measurements were performed in order to scan the Residual Stress distribution along the external surface of each pipe. On the other hand, a smaller set of Measurements were performed in the internal surface of an ERW pipe sample. Considering all cases, the mapping has revealed the presence of Stress profiles which were compressive in the first half of the hole and tensile in the second one. Additionally, the external Measurements demonstrated a good repeatability between them, indicating a similar Stress behavior along the circumferential and longitudinal directions of the pipe.

  • compact sensor combining digital speckle pattern interferometry and the hole drilling technique to Measure nonuniform Residual Stress fields
    Optical Engineering, 2013
    Co-Authors: Matias R. Viotti, Armando Albertazzi
    Abstract:

    A portable device to essentially Measure Residual Stress fields outside an optical bench is presented. This system combines the hole-drilling technique with digital speckle pattern interferometry. A novel feature of this device is its high degree of compaction since only one base supports simultaneously the Measurement module and the hole-drilling device. A new version of the American society for testing and materials standard E837 for the Measurement of Residual Stresses has been improved including a computation method for nonuniform Residual Stresses. According to this standard, a hole with a maximum depth of 1.0 mm should be introduced into the material to assess the Stress distribution along the hole’s depth. The discretization of the Stress distribution is performed in 20 equal steps of 0.05 mm, getting the deformations generated for Stress relief in every drilling step. A description of the compact device showing the solution for a fast and easy interchanging process between modules is also presented. The proposed system was compared with a traditional method using strain gages, and a good agreement was shown between Stress distributions Measured with both methods. Finally, the portable device was used to evaluate the Residual Stress distribution in a sample with a rod welded by friction hydro pillar processing.

  • compact sensor combining dspi and the hole drilling technique to Measure non uniform Residual Stress fields
    SPECKLE 2012: V International Conference on Speckle Metrology : 10-12 september 2012 : Vigo Spain 2012 ISBN 9780819490902, 2012
    Co-Authors: Matias R. Viotti, Armando Albertazzi
    Abstract:

    This paper presents a portable device to essentially Measure Residual Stress fields outside the optical bench. This system combines the hole drilling technique with Digital Speckle Pattern Interferometry (DSPI). The novel feature of this device is its high degree of compaction since only one base supports simultaneously the Measurement module and the holedrilling device. A new version of the ASTM E837 standard for the Measurement of Residual Stresses has been improved including the computation method for non-uniform Residual Stresses. According to this standard, a hole with depth of 1.0 mm should be introduced into the material to assess the Stress distribution. The discretization of the Stress distribution along the hole depth is performed in 20 equal steps of 0.05 mm, getting the deformations generated for Stress relief in every drilling step. A description of the compact device showing the solution for a fast and easy interchanging process between modules is performed in this paper. The proposed system is used to evaluate the Residual Stress distribution into a sample with a rod welded by friction hydro pillar processing (FHPP)

  • experimental comparison between a portable dspi device with diffractive optical element and a hole drilling strain gage combined system
    Optics and Lasers in Engineering, 2008
    Co-Authors: Matias R. Viotti, Armando Albertazzi, Walter A Kapp
    Abstract:

    This paper presents a portable device to Measure Residual Stress fields outside the optical bench. This system combines the hole drilling technique with digital speckle pattern interferometry. The novel feature of this device is the application of a binary diffractive optical element (DOE) in order to generate double illumination and radial in-plane sensitivity. The use of the DOE ensures constant sensitivity since it only depends on the grating period, having lack of dependence on the wavelength of the illumination source. Descriptions of the DOE and the portable device are followed by the presentation of experimental results showing that the combined system can Measure Residual Stress fields with an uncertainty of 7%. On the other hand, these fields were Measured with the traditional strain gage hole drilling technique. A set of results obtained for a Residual Stress level of 45% of the yield Stress of the material, showed a good agreement between both evaluated systems.

Tae Eun Jin - One of the best experts on this subject based on the ideXlab platform.

  • Residual Stress Measurement on welded specimen by neutron diffraction
    Journal of Materials Processing Technology, 2004
    Co-Authors: Man Jin Park, Hee Nam Yang, Dong Y. Jang, Jong-sung Kim, Tae Eun Jin
    Abstract:

    Residual Stress is generated in the structures as a result of irregular elastic-plastic deformation during fabrication processes such as welding, heat treatment, and mechanical processing. There are several factors attributed to the origin of Residual Stresses, tensile or compressive. The Stresses can be determined by destructive ways or non-destructive ways by using X-ray or neutron diffraction. This paper presents the application of neutron diffraction technique to Measure Residual Stress distribution in the welded stainless steel plate. T-type and a double V butt joint welded stainless steel specimens were utilized to study the application of neutron diffraction to Residual Stress Measurement. © 2004 Elsevier B.V. All rights reserved.

Man Jin Park - One of the best experts on this subject based on the ideXlab platform.

  • Residual Stress Measurement on welded specimen by neutron diffraction
    Journal of Materials Processing Technology, 2004
    Co-Authors: Man Jin Park, Hee Nam Yang, Dong Y. Jang, Jong-sung Kim, Tae Eun Jin
    Abstract:

    Residual Stress is generated in the structures as a result of irregular elastic-plastic deformation during fabrication processes such as welding, heat treatment, and mechanical processing. There are several factors attributed to the origin of Residual Stresses, tensile or compressive. The Stresses can be determined by destructive ways or non-destructive ways by using X-ray or neutron diffraction. This paper presents the application of neutron diffraction technique to Measure Residual Stress distribution in the welded stainless steel plate. T-type and a double V butt joint welded stainless steel specimens were utilized to study the application of neutron diffraction to Residual Stress Measurement. © 2004 Elsevier B.V. All rights reserved.

Walter A Kapp - One of the best experts on this subject based on the ideXlab platform.

  • experimental comparison between a portable dspi device with diffractive optical element and a hole drilling strain gage combined system
    Optics and Lasers in Engineering, 2008
    Co-Authors: Matias R. Viotti, Armando Albertazzi, Walter A Kapp
    Abstract:

    This paper presents a portable device to Measure Residual Stress fields outside the optical bench. This system combines the hole drilling technique with digital speckle pattern interferometry. The novel feature of this device is the application of a binary diffractive optical element (DOE) in order to generate double illumination and radial in-plane sensitivity. The use of the DOE ensures constant sensitivity since it only depends on the grating period, having lack of dependence on the wavelength of the illumination source. Descriptions of the DOE and the portable device are followed by the presentation of experimental results showing that the combined system can Measure Residual Stress fields with an uncertainty of 7%. On the other hand, these fields were Measured with the traditional strain gage hole drilling technique. A set of results obtained for a Residual Stress level of 45% of the yield Stress of the material, showed a good agreement between both evaluated systems.