Neutron diffraction measurement of residual stress in high strength, highly restrained, thick section steel welds

2006 ◽  
Vol 385-386 ◽  
pp. 590-593 ◽  
Author(s):  
S.V. Pearce ◽  
V.M. Linton
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
High Strength ◽  
Diffraction Measurement ◽  
Thick Section ◽  
Neutron Diffraction Measurement ◽  
Steel Welds

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.

Determination of Repair Weld Residual Stress in a Tube to Tube-Sheet Joint by Neutron Diffraction and the Finite Element Method

2018 ◽  
Vol 140 (2) ◽  
Author(s):  
Yun Luo ◽  
Wenchun Jiang ◽  
Dongfeng Chen ◽  
Robert C. Wimpory ◽  
Meijuan Li ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
Diffraction Measurement ◽  
Neutron Diffraction Measurement ◽  
Repair Welding ◽  
Welding Direction ◽  
Element Method

Repair welding is a popular method to repair the leakage zone in tube-to-tubesheet joint of shell-tube heat exchangers. But the repaired residual stresses are generated inevitably and have a great effect on stress corrosion cracking (SCC). In this paper, the effects of repair welding on residual stress were studied by finite element method (FEM) and neutron diffraction measurement. The original weld residual stresses calculated by FEM showed good agreement with neutron diffraction measurement results. After repair welding, the transverse residual stresses change very little while the longitudinal residual stresses are increased in the repair zone. In the nonrepair zone, both the transverse and longitudinal stresses are decreased. The repair welding times have little effect on residual stress distribution. With the increase of welding length and heat input, the residual stresses increase. Repair opposite to the original welding direction is recommended because the opposite welding direction minimizes the residual stresses.

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