The Experts below are selected from a list of 6 Experts worldwide ranked by ideXlab platform
Željko Domazet - One of the best experts on this subject based on the ideXlab platform.
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Thermographic Analysis of Stress Distribution in Welded Joints
EPJ Web of Conferences, 2010Co-Authors: Tonči Piršić, L. Krstulović Opara, Željko DomazetAbstract:The fatigue life prediction of welded joints based on S-N curves in conjunction with nominal Stresses generally is not reliable. Stress distribution in welded area affected by geometrical inhomogeneity, irregular welded surface and weld toe radius is quite complex, so the Local (Structural) Stress concept is accepted in recent papers. The aim of this paper is to determine the Stress distribution in plate type aluminum welded joints, to analyze the reliability of TSA (Thermal Stress Analysis) in this kind of investigations, and to obtain numerical values for Stress concentration factors for practical use. Stress distribution in aluminum butt and fillet welded joints is determined by using the three different methods: strain gauges measurement, thermal Stress analysis and FEM. Obtained results show good agreement - the TSA mutually confirmed the FEM model and Stresses measured by strain gauges. According to obtained results, it may be stated that TSA, as a relatively new measurement technique may in the future become a standard tool for the experimental investigation of Stress concentration and fatigue in welded joints that can help to develop more accurate numerical tools for fatigue life prediction.
Tonči Piršić - One of the best experts on this subject based on the ideXlab platform.
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Thermographic Analysis of Stress Distribution in Welded Joints
EPJ Web of Conferences, 2010Co-Authors: Tonči Piršić, L. Krstulović Opara, Željko DomazetAbstract:The fatigue life prediction of welded joints based on S-N curves in conjunction with nominal Stresses generally is not reliable. Stress distribution in welded area affected by geometrical inhomogeneity, irregular welded surface and weld toe radius is quite complex, so the Local (Structural) Stress concept is accepted in recent papers. The aim of this paper is to determine the Stress distribution in plate type aluminum welded joints, to analyze the reliability of TSA (Thermal Stress Analysis) in this kind of investigations, and to obtain numerical values for Stress concentration factors for practical use. Stress distribution in aluminum butt and fillet welded joints is determined by using the three different methods: strain gauges measurement, thermal Stress analysis and FEM. Obtained results show good agreement - the TSA mutually confirmed the FEM model and Stresses measured by strain gauges. According to obtained results, it may be stated that TSA, as a relatively new measurement technique may in the future become a standard tool for the experimental investigation of Stress concentration and fatigue in welded joints that can help to develop more accurate numerical tools for fatigue life prediction.
L. Krstulović Opara - One of the best experts on this subject based on the ideXlab platform.
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Thermographic Analysis of Stress Distribution in Welded Joints
EPJ Web of Conferences, 2010Co-Authors: Tonči Piršić, L. Krstulović Opara, Željko DomazetAbstract:The fatigue life prediction of welded joints based on S-N curves in conjunction with nominal Stresses generally is not reliable. Stress distribution in welded area affected by geometrical inhomogeneity, irregular welded surface and weld toe radius is quite complex, so the Local (Structural) Stress concept is accepted in recent papers. The aim of this paper is to determine the Stress distribution in plate type aluminum welded joints, to analyze the reliability of TSA (Thermal Stress Analysis) in this kind of investigations, and to obtain numerical values for Stress concentration factors for practical use. Stress distribution in aluminum butt and fillet welded joints is determined by using the three different methods: strain gauges measurement, thermal Stress analysis and FEM. Obtained results show good agreement - the TSA mutually confirmed the FEM model and Stresses measured by strain gauges. According to obtained results, it may be stated that TSA, as a relatively new measurement technique may in the future become a standard tool for the experimental investigation of Stress concentration and fatigue in welded joints that can help to develop more accurate numerical tools for fatigue life prediction.
Hong Tae Kang - One of the best experts on this subject based on the ideXlab platform.
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fatigue damage parameter of spot welded joints under proportional loading
International Journal of Automotive Technology, 2005Co-Authors: Hong Tae KangAbstract:In this paper, the author proposes a fatigue damage parameter of spot welded joints under proportional loading. The proposed fatigue damage parameter is developed based on von Mises’ equivalent Stress and Local Structural Stress at the edge of spot weld nugget. The Structural Stress at the edges of the weld nugget in each sheet is calculated using the forces and moments that are determined by finite element analysis. A Structural equivalent Stress is then calculated by von Mises’ equivalent Stress equation. The Structural equivalent Stresses are correlated to experimental fatigue life of the spot welded joints. The proposed parameter is evaluated with fatigue test data of spot welds subjected to multiaxial and tensile-shear loads. Sheppard’s parameter and Rupp and co-workers’ parameter are also evaluated with the same test data to compare with the author’s parameter. This proposed parameter presents a better correlation with experimental fatigue data than those of Sheppard’s and Rupp and co-workers’ parameter. The proposed parameter should be very effective for durability calculations during the early design phase since coarsely meshed finite element models can be employed.
