scholarly journals Welding Residual Stress Estimation by Inherent Strain Analysis and Thermal Elastic Plastic Analysis and Its Verification Using Neutron Diffraction Measurement.

1997 ◽  
Vol 63 (612) ◽  
pp. 1675-1680 ◽  
Author(s):  
Masahito MOCHIZUKI ◽  
Makoto HAYASHI ◽  
Toshio HATTORI
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Strain Analysis ◽  
Welding Residual Stress ◽  
Diffraction Measurement ◽  
Neutron Diffraction Measurement ◽  
Elastic Plastic ◽  
Plastic Analysis ◽  
Stress Estimation ◽  
Inherent Strain

Numerical Analysis of Welding Residual Stress and Its Verification Using Neutron Diffraction Measurement

1999 ◽  
Vol 122 (1) ◽  
pp. 98-103 ◽  
Author(s):  
Masahito Mochizuki ◽  
Makoto Hayashi ◽  
Toshio Hattori
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Surface Stress ◽  
Welded Joint ◽  
Strain Analysis ◽  
Evaluation Methods ◽  
Welding Residual Stress ◽  
Diffraction Measurement ◽  
Stress Distributions ◽  
Inherent Strain

Direct measurements and computed distributions of through-thickness residual stress in a pipe butt-welded joint and a pipe socket-welded joint are compared. The analytical evaluation methods used were inherent strain analysis and thermal elastic-plastic analysis. The experimental methods were neutron diffraction for the internal residual stress, and X-ray diffraction and strain-gauge measurement for the surface stress. The residual stress distributions determined using these methods agreed well with each other, both for internal stress and surface stress. The characteristics of the evaluation methods and the suitability of these methods for each particular welded object to be evaluated are discussed. [S0094-4289(00)01501-2]

Inherent Strain Method and Thermal Elastic-Plastic Analysis of Welding Deformation of a Thin-Wall Beam

2008 ◽  
Vol 24 (4) ◽  
pp. 301-309 ◽  
Author(s):  
Y.-X. Wang ◽  
P. Zhang ◽  
Z.-G. Hou ◽  
C.-Z. Li
Keyword(s):  
Temperature Field ◽  
Strain Analysis ◽  
Welding Deformation ◽  
Thin Wall ◽  
Analysis Method ◽  
Elastic Plastic ◽  
Plastic Analysis ◽  
Inherent Strain ◽  
Inherent Strain Method ◽  
Strain Method

AbstractThe transient thermal process of a thin-wall beam with CO2 Gas Metal Arc Welding (GMAW) is analyzed by Finite Element Analysis Method (FEA). The thermal input is simplified as transient section body heat sources and loaded as its actual sequence in the analysis. The transient temperature field obtained can represent the basic characteristics of the real welding process and can be used as the foundation of thermal elastic-plastic analysis. Based on the temperature field, thermal elastic-plastic FEA is performed on the thin-wall beam. The distribution and change of the welding deformation, stress and strain are obtained and compared with the experiment results. Also an improvement can be presented on the inherent strain method. Using the inherent strain method, the welding deformation of the thin-wall beam is calculated. The temperature loading method is developed to load the variable inherent strain value expediently. The loading of inherent strain value on spatial welding line that is unparallel to the global coordinate axis is achieved with the application of element coordinate system. Comparison with the experiment results shows that both the thermal-elastic-plastic analysis and inherent strain analysis method can be used to predict the welding deformation effectively, the results calculated by both the thermal-elastic-plastic analysis and inherent strain analysis are close to the test measure results.

Measurement of Through-Thickness Residual Stress in Primary Piping of Girth Welded Joint

2008 ◽  
Vol 580-582 ◽  
pp. 577-580
Author(s):  
Masahito Mochizuki ◽  
Shigetaka Okano ◽  
Gyu Baek An ◽  
Masao Toyoda
Keyword(s):  
Residual Stress ◽  
Direct Measurement ◽  
Welded Joint ◽  
Strain Analysis ◽  
Residual Stress Distribution ◽  
Welding Residual Stress ◽  
Thickness Direction ◽  
Welded Pipe ◽  
Inherent Strain ◽  
Pipe Joint

The welding residual stress of a butt-welded pipe joint is evaluated, using inherent strain analysis. The residual stress distribution is obtained in detail along the thickness direction. The residual stresses are similar to values obtained by direct measurement on the specimen surface; as if though direct measurement is not used for the inherent strain analysis. These results indicate that inherent strain analysis is effective in evaluating through-thickness residual stress in primary piping of girth welded joint.

Neutron diffraction measurement of residual stress in a centrifugal bowl of duplex steel

2001 ◽  
Vol 9 (2) ◽  
pp. 305-312 ◽  
Author(s):  
Gianni Albertini ◽  
Ru Lin Peng ◽  
Adrian Manescu ◽  
Araldo Ponzetti
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Diffraction Measurement ◽  
Neutron Diffraction Measurement ◽  
Duplex Steel

Comparison of Brazed Residual Stress and Thermal Deformation between X-Type and Pyramidal Lattice Truss Sandwich Structure: Neutron Diffraction Measurement and Simulation Study

2016 ◽  
Vol 35 (6) ◽  
pp. 567-574 ◽  
Author(s):  
Wenchun Jiang ◽  
Zhiquan Wei ◽  
Yun Luo ◽  
Weiya Zhang ◽  
Wanchuck Woo
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
Sandwich Structure ◽  
Thermal Deformation ◽  
Diffraction Measurement ◽  
Neutron Diffraction Measurement ◽  
Pyramidal Structure ◽  
Transverse Stresses ◽  
Type Lattice

AbstractThis paper uses finite element method and neutron diffraction measurement to study the residual stress in lattice truss sandwich structure. A comparison of residual stress and thermal deformation between X-type and pyramidal lattice truss sandwich structure has been carried out. The residual stresses are concentrated in the middle joint and then decreases gradually to both the ends. The residual stresses in the X-type lattice truss sandwich structure are smaller than those in pyramidal structure. The maximum longitudinal and transverse stresses of pyramidal structure are 220 and 202 MPa, respectively, but they decrease to 190 and 145 MPa for X-type lattice truss sandwich structure, respectively. The thermal deformation for lattice truss sandwich panel structure is of wave shape. The X-type has a better resistance to thermal deformation than pyramidal lattice truss sandwich structure. The maximum wave deformation of pyramidal structure (0.02 mm) is about twice as that of X-type (0.01 mm) at the same brazing condition.

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