Residual Stresses Distribution Measured by Neutron Diffraction in Fabricated Square High Strength Steel Tubes

2014 ◽  
Vol 777 ◽  
pp. 249-254 ◽  
Author(s):  
Fidelis R. Mashiri ◽  
Anna M. Paradowska ◽  
Brian Uy ◽  
Zhong Tao ◽  
Mahbub Khan ◽  
...  
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
High Strength Steel ◽  
Local Buckling ◽  
High Strength ◽  
Civil Engineering Infrastructure ◽  
Stress Line ◽  
Stub Columns

Engineers are increasingly encouraged to consider sustainability in the design and construction of new civil engineering infrastructure. Sustainability can be achieved through the use of high strength materials thereby reducing quantity of materials required in construction where possible. Knowledge of residual stresses in fabricated columns is important in identifying whether the fabricated columns can be classified as heavily welded (HW) or lightly welded (LW). The determination of residual stresses can be used to determine the local buckling of stub columns. Residual stress magnitudes are also essential in the numerical modelling of buckling behaviour of columns. This paper outlines the challenges in measurement of residual stresses using neutron diffraction in fabricated high strength steel square tubes. The residual stress line scans and maps were measured using the Kowari Strain Scanner located at the Australian Nuclear and Science Organisation (ANSTO) in Australia.

Numerical Simulation of Residual Stresses due to Multipass Welding in High Strength Steel Plates and Validation against Experimental Measurements

2018 ◽  
Vol 941 ◽  
pp. 269-273
Author(s):  
Constant Ramard ◽  
Denis Carron ◽  
Philippe Pilvin ◽  
Florent Bridier
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
High Strength Steel ◽  
High Strength ◽  
Steel Plates ◽  
Contour Method ◽  
Hole Drilling ◽  
Experimental Measurements ◽  
Element Analysis ◽  
Multipass Welding

Multipass arc welding is commonly used for thick plates assemblies in shipbuilding. Sever thermal cycles induced by the process generate inhomogeneous plastic deformation and residual stresses. Metallurgical transformations contribute at each pass to the residual stress evolution. Since residual stresses can be detrimental to the performance of the welded product, their estimation is essential and numerical modelling is useful to predict them. Finite element analysis of multipass welding of a high strength steel is achieved with a special emphasis on mechanical and metallurgical effects on residual stress. A welding mock-up was specially designed for experimental measurements of in-depth residual stresses using contour method and deep hole drilling and to provide a simplified case for simulation. The computed results are discussed through a comparison with experimental measurements.

Methods for Determination of Residual Stress of a Formed Plate Using Laser Ablation, Wire EDM and Milling

2011 ◽  
Vol 473 ◽  
pp. 368-375
Author(s):  
Janne Lämsä ◽  
Kari Mäntyjärvi ◽  
Antti Järvenpää ◽  
Martin Grüner ◽  
Marion Merklein ◽  
...  
Keyword(s):  
Residual Stress ◽  
Laser Ablation ◽  
Residual Stresses ◽  
Pulse Length ◽  
High Strength ◽  
Wire Edm ◽  
Air Bending ◽  
Speci Mens ◽  
Dimensional Errors

In this work laser ablation was used for the determination of residual stress of a formed plate. Manufacturing processes, like bending, create residual stresses in the product and those can be very disadvantageous for fatigue durability. Residual stresses that are generated during the manu-facturing of products can cause distortions, dimensional errors or can even break the products. The research material was ultra-high-strength steel (UHSS) with a yield strength of 1100 MPa. Speci-mens with a 90 degree bent angle were made by air bending using a press brake. Air bending causes variable residual stress patterns in the cross section of the material. The residual stresses of the formed area were determined by removing material and measuring strains caused by the release of stresses. A slot with the width of 1 mm has been manufactured parallel to the edge, both on the outer and on the inner side of the bend. True residual stress distribution can be calculated from the measured strains. A pumped 1064 nm Nd:YVO4 ablation laser, whose pulse length is 90 ns, was used for the removal of material. This process creates a negligible heat affected zone (HAZ) and laser ablation doesn’t increase stresses in the specimen. The results were compared with those ob-tained when slots were produced by milling and wire-EDM, as well as with the stress values meas-ured by X-ray diffraction.

Strength and residual stress evaluation of stub columns fabricated from 800MPa high-strength steel

2014 ◽  
Vol 102 ◽  
pp. 111-120 ◽  
Author(s):  
Dae-Kyung Kim ◽  
Cheol-Ho Lee ◽  
Kyu-Hong Han ◽  
Jin-Ho Kim ◽  
Seung-Eun Lee ◽  
...  
Keyword(s):  
Residual Stress ◽  
High Strength Steel ◽  
High Strength ◽  
Stress Evaluation ◽  
Stub Columns

scholarly journals Compressive Strength and Residual Stress Evaluation of Stub Columns Fabricated of High Strength Steel

2012 ◽  
Vol 24 (1) ◽  
pp. 23-34 ◽  
Author(s):  
Cheol-Ho Lee ◽  
Dae-Kyung Kim ◽  
Kyu-Hong Han ◽  
Jin-Ho Kim ◽  
Seung-Eun Lee ◽  
...  
Keyword(s):  
Residual Stress ◽  
Compressive Strength ◽  
High Strength Steel ◽  
High Strength ◽  
Stress Evaluation ◽  
Stub Columns

Residual Stress Measurements by Means of Neutron Diffraction

1989 ◽  
Vol 166 ◽  
Author(s):  
H. J. Prask ◽  
C. S. Choi
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
Test Specimen ◽  
Hardened Steel ◽  
Fatigue Lifetime ◽  
Near Surface ◽  
Surface Residual Stresses ◽  
Lifetime Test

ABSTRACTEnergy-dispersive neutron diffraction has been developed at the NIST reactor as a probe of sub- and near-surface residual stresses in technological samples. Application of the technique has been made to a variety of metallurgical specimens which includes the determination of tri-axial stresses as a function of depth in a number of uranium-3/4wt%Ti samples with different thermo-mechanical histories, and in two types of 7075-T6 aluminum “ogives”- of interest to the Army. Preliminary results have been obtained for an induction-hardened steel shaft, a fatigue lifetime test specimen for the SAE.

Sign in / Sign up

Export Citation Format

Share Document