Application of Miniature Ring-Core and Interferometric Strain/Slope Rosette to Determine Residual Stress Distribution With Depth—Part II: Experiments

2006 ◽  
Vol 74 (2) ◽  
pp. 307-314 ◽  
Author(s):  
Wei Ren ◽  
Keyu Li
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
High Stress ◽  
High Sensitivity ◽  
Residual Stress Distribution ◽  
Theoretical Development ◽  
Small Areas ◽  
Core Method ◽  
Stability And Accuracy ◽  
Ring Core

The theoretical development of the interferometric strain/slope rosette (ISSR) and ring-core cutting method is described in Part I of the paper [K. Li and W. Ren, ASME J. Appl. Mech. 74(2), 298–306 (2007)]. In Part II, experiments are presented to demonstrate the applicability of the method. The procedures of experimentation are developed. An ISSR/ring-core cutting system was established and its measurement stability and accuracy were examined in a two-step measurement program. By repeating the two-step measurement procedures, several incremental ring-core cutting experiments were conducted. Residual stress distribution is calculated from the measured ISSR data by using the relaxation coefficients calibrated in Part I of the paper. Measurement resolution, accuracy, and sensitivity of the ISSR/ring-core method are evaluated. Tests on a titanium block show the reliability of the method in comparison with the results obtained by using other measurement methods. The new method is also applied on a laser weld which demonstrates its uniqueness to measure residual stresses in small areas with high stress gradients. The experiments show advantages of the ISSR/ring-core method, such as miniature size, noncontacting nature, and high sensitivity. The method can be effectively used to measure residual stress distributions with depth on various manufactured components.

scholarly journals Influence of Interlayer Temperature and Welding Sequence on the Temperature Distribution and Welding Residual Stress of the Saddle-Shaped Joint of Weldolet-Header Butt Welding

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 5980
Author(s):  
Chunliang Mai ◽  
Xue Hu ◽  
Lixin Zhang ◽  
Bao Song ◽  
Xiongfei Zheng
Keyword(s):  
Numerical Simulation ◽  
Residual Stress ◽  
Stress Distribution ◽  
High Stress ◽  
Welding Process ◽  
Residual Stress Distribution ◽  
Welding Residual Stress ◽  
Two Stage ◽  
Welding Sequence ◽  
Simulation Results

In this paper, based on Simufact Welding finite element analysis software, a numerical simulation of the temperature and residual stress distribution of the weldolet-header multi-layer multi-pass welding process is carried out, and the simulation results are verified through experiments. The experimental results are in good agreement with the numerical simulation results, which proves the validity of the numerical simulation results. Through the results of the numerical simulation, the influence of the welding sequence and interlayer temperature on the temperature and residual stress distribution at different locations of the saddle-shaped weld was studied. The results show that the temperature and residual stress distribution on the header and weldolet are asymmetric, and the high-stress area of the saddle-shaped welded joint always appears at the saddle shoulder or saddle belly position. When the interlayer temperature is 300 °C, the peak residual stress reaches a minimum of 428.35 MPa. Adjusting the welding sequence can change the distribution trend of residual stress. There is no high-stress area on the first welding side of the two-stage welding path-2. The peak values of residual stresses for continuous welding path-1 and two-stage welding path-2 are 428.35 MPa and 434.01 MPa, respectively, which are very close to each other.

Application of Minature Ring-Core and Interferometric Strain/Slope Rosette to Determine Residual Stress Distribution With Depth—Part I: Theories

2006 ◽  
Vol 74 (2) ◽  
pp. 298-306 ◽  
Author(s):  
Keyu Li ◽  
Wei Ren
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Stress Measurement ◽  
Residual Stress Distribution ◽  
Finite Element Models ◽  
Stress Strain ◽  
Mechanical Stress Relief ◽  
Strain Rosette ◽  
Out Of Plane ◽  
Ring Core

The principle of an interferometric strain/slope rosette (ISSR) is based on interference of laser beams reflected from three microindentations on a specimen surface. The ISSR can simultaneously measure the in-plane strains and the out-of-plane slopes. Ring-core cutting is a mechanical stress relief method. When used with the ISSR technique for residual stress measurement, the ring core can be made much smaller than used with the resistance strain rosette. Thus, more localized residual stresses can be measured. The theories of the ISSR/ring-core cutting method are described in this paper. Both mechanical and finite element models are developed for the incremental ring-core cutting process with the application of the ISSR technique. The stress-strain coefficients of the ISSR/ring-core method are calculated and nondimensionalized for general applications. A test example is given to demonstrate how residual stress distribution is determined by using the stress-strain coefficients and the ISSR data.

Residual Stress Analysis of Silicon Nitride to Carbon Steel Joint

1990 ◽  
Vol 34 ◽  
pp. 661-668
Author(s):  
Masanori Kurita ◽  
Takashi Kano ◽  
Takashi Sato
Keyword(s):  
Residual Stress ◽  
Silicon Nitride ◽  
Carbon Steel ◽  
Stress Distribution ◽  
High Stress ◽  
Three Dimensional ◽  
Residual Stress Distribution ◽  
Steel Plates ◽  
X Rays ◽  
High Stress Concentration

AbstractThe residual stress distribution of a ceramic-metal joint specimen was determined by both two- and three-dimensional thermoelastoplastic stress analyses using the finite element method (FEM). The residual stress on the surface of the specimen was also measured by x-ray diffraction. A specimen was prepared by brazing a silicon nitride plate to a carbon steel plate. The highest tensile stress σx perpendicular to the interface appeared at the corners of the silicon nitride adjacent to the interface. The maximum compressive stress σy parallel to the interface occurred at the center of the interface of the silicon nitride. The residual stresses in the silicon nitride and the steel plates distribute antisymmetrically with respect to the center of the specimen. Around the interface, the high stress concentration occurs and the residual stress distributes three-dimensionally, giving a wrong result by the two-dimensional FEM. The residual stress distribution measured by x-rays was similar to that calculated from the three-dimensional FEM.

Influence of the Welded Joint on the Mechanical Behavior of Steel Piles during Static and Dynamic Deformation

2007 ◽  
Vol 345-346 ◽  
pp. 1469-1472
Author(s):  
Gab Chul Jang ◽  
Kyong Ho Chang ◽  
Chin Hyung Lee
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Mechanical Behavior ◽  
Welded Joint ◽  
Dynamic Deformation ◽  
Three Dimensional ◽  
Steel Structures ◽  
Residual Stress Distribution ◽  
Dynamic Mechanical Behavior ◽  
Steel Piles

During manufacturing the welded joint of steel structures, residual stress is produced and weld metal is used inevitably. And residual stress and weld metal influence on the static and dynamic mechanical behavior of steel structures. Therefore, to predict the mechanical behavior of steel pile with a welded joint during static and dynamic deformation, the research on the influence of the welded joints on the static and dynamic behavior of steel pile is clarified. In this paper, the residual stress distribution in a welded joint of steel piles was investigated by using three-dimensional welding analysis. The static and dynamic mechanical behavior of steel piles with a welded joint is investigated by three-dimensional elastic-plastic finite element analysis using a proposed dynamic hysteresis model. Numerical analyses of the steel pile with a welded joint were compared to that without a welded joint with respect to load carrying capacity and residual stress distribution. The influence of the welded joint on the mechanical behavior of steel piles during static and dynamic deformation was clarified by comparing analytical results

scholarly journals A study on the optimization of residual stress distribution in the polyethylene and polyketone double layer pipes

2021 ◽  
pp. 101547
Author(s):  
A.G. Ramu ◽  
Sunwoo Kim ◽  
Heungwoo Jeon ◽  
Amal M. Al-Mohaimeed ◽  
Wedad A. Al-onazi ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Double Layer ◽  
Residual Stress Distribution
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