scholarly journals Effect of Cold Rolling Parameters on the Longitudinal Residual Stress Distribution of GH4169 Alloy Sheet

2015 ◽  
Vol 28 (12) ◽  
pp. 1510-1517 ◽  
Author(s):  
Neng-Yong Ye ◽  
Ming Cheng ◽  
Shi-Hong Zhang
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Cold Rolling ◽  
Alloy Sheet ◽  
Residual Stress Distribution ◽  
Longitudinal Residual Stress ◽  
Gh4169 Alloy

A numerical prediction of residual stress for a thin-walled part with geometrical features fabricated by GMA-based additive manufacturing

2019 ◽  
Vol 26 (2) ◽  
pp. 299-308
Author(s):  
Rong Li ◽  
Jun Xiong
Keyword(s):  
Residual Stress ◽  
Additive Manufacturing ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Residual Stress Distribution ◽  
Stress Distributions ◽  
Content Type ◽  
Geometrical Features ◽  
Longitudinal Residual Stress ◽  
Thin Walled

Purpose An accurate prediction of process-induced residual stress is necessary to prevent large distortion and cracks in gas metal arc (GMA)-based additive manufactured parts, especially thin-walled parts. The purpose of this study is to present an investigation into predicting the residual stress distributions of a thin-walled component with geometrical features. Design/methodology/approach A coupled thermo-mechanical finite element model considering a general Goldak double ellipsoidal heat source is built for a thin-walled component with geometrical features. To confirm the accuracy of the model, corresponding experiments are performed using a positional deposition method in which the torch is tilted from the normal direction of the substrate. During the experiment, the thermal cycle curves of locations on the substrate are obtained by thermocouples. The residual stresses on the substrate and part are measured using X-ray diffraction. The validated model is used to investigate the thermal stress evolution and residual stress distributions of the substrate and part. Findings Decent agreements are achieved after comparing the experimental and simulated results. It is shown that the geometrical feature of the part gives rise to an asymmetrical transversal residual stress distribution on the substrate surface, while it has a minimal influence on the longitudinal residual stress distribution. The residual stress distributions of the part are spatially uneven. The longitudinal tensile residual stress is the prominent residual stress in the central area of the component. Large wall-growth tensile residual stresses, which may cause delamination, appear at both ends of the component and the substrate–component interfaces. Originality/value The predicted residual stress distributions of the thin-walled part with geometrical features are helpful to understand the influence of geometry on the thermo-mechanical behavior in GMA-based additive manufacturing.

Researches on Rules of the Longitudinal Residual Stress Distribution in Straightening Deformation Zone of Heavy Rail with Multi-Rollers

2008 ◽  
Vol 575-578 ◽  
pp. 231-236 ◽  
Author(s):  
Lin Chen ◽  
Zhong Liang Tian ◽  
Mi Chao Gao ◽  
Wei Zong ◽  
Jian Guo Wang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stress Distribution ◽  
Deformation Zone ◽  
Residual Stress Distribution ◽  
The Real ◽  
Rail Head ◽  
Finite Element Software ◽  
Longitudinal Residual Stress ◽  
Heavy Rail

The paper simulated and researched the straightening process of heavy rail by finite element software of ANSYS/LS-DYNA. The residual stress of the rail head, rail base, rail loin in the 7th deformation zone meets the real straightening condition in the straightening simulation. The calculation indicates: The residual stress of the rail head, rail base, rail loin in various deformation zones varies significantly like the variation of tensile-compression-tensile. Compared with the on-site rule, the residual stress of rail base decreased155 Mpa, this is in agreement with the values of practice.

Investigation of residual stress distribution in a rail head

1994 ◽  
Vol 29 (1) ◽  
pp. 73-78 ◽  
Author(s):  
M Zochowski ◽  
M Tracz
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Stress Gradient ◽  
Residual Stress Distribution ◽  
Rail Head ◽  
Sharp Stress ◽  
Longitudinal Residual Stress ◽  
Strong Compression ◽  
Neighbouring Area

This paper presents a destructive procedure for the determination of longitudinal residual stress distribution in a thin layer in the vicinity of the running surface of a rail head and the neighbouring area of rail cross-section. Wheel passages on the track produce plastic deformation in the running surface layer and thereby create a strong compression with a sharp stress gradient in the layer. This longitudinal stress distribution is a very important component of the stress pattern and strongly influences crack propagation in the rail head.

scholarly journals Numerical Prediction of Residual Stresses Distribution in Thin-Walled Press-Braked Stainless Steel Sections

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5378
Author(s):  
Ayad Mutafi ◽  
Noorfaizal Yidris ◽  
Seyed Saeid Rahimian Koloor ◽  
Michal Petrů
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stainless Steel ◽  
Stress Distribution ◽  
Residual Stresses ◽  
Cold Rolling ◽  
Stainless Steels ◽  
Residual Stress Distribution ◽  
Material Anisotropy ◽  
Steel Sections

Stainless steels are increasingly used in construction today, especially in harsh environments, in which steel corrosion commonly occurs. Cold-formed stainless steel structures are currently increasing in popularity because of its efficiency in load-bearing capacity and its appealing architectural appearance. Cold-rolling and press-braking are the cold-working processes used in the forming of stainless steel sections. Press braking can produce large cross-sections from thin to thick-walled sections compared to cold-rolling. Cold-forming in press-braked sections significantly affect member behaviour and joints; therefore, they have attained great attention from many researchers to initiate investigations on those effects. This paper examines the behaviour of residual stress distribution of stainless steel press-braked sections by implementing three-dimensional finite element (3D-FE) technique. The study proposed a full finite element procedure to predict the residual stresses starting from coiling-uncoiling to press-braking. This work considered material anisotropy to examine its effect on the residual stress distribution. The technique adopted was compared with different finite element techniques in the literature. This study also provided a parametric study for three corner radius-to-thickness ratios looking at the through-thickness residual stress distribution of four stainless steels (i.e., ferritic, austenitic, duplex, lean duplex) in which have their own chemical composition. In conclusion, the comparison showed that the adopted technique provides a detailed prediction of residual stress distribution. The influence of geometrical aspects is more pronounced than the material properties. Neglecting the material anisotropy shows higher shifting in the neutral axis. The parametric study showed that all stainless steel types have the same stress through-thickness distribution. Moreover, R/t ratios’ effect is insignificant in all transverse residual stress distributions, but a slight change to R/t ratios can affect the longitudinal residual stress distribution.

Investigation on Residual Stress Distribution of H-Shaped Steel Section with Heavy Thick Steel Used in High-Rise Structures

2011 ◽  
Vol 374-377 ◽  
pp. 1733-1737
Author(s):  
Yuan Qi Li ◽  
Qi Yan ◽  
Si Sun ◽  
Zu Yan Shen ◽  
Cheng Feng Yu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Structural Steel ◽  
Reliability Analysis ◽  
Strength Distribution ◽  
Residual Stress Distribution ◽  
National Standards ◽  
Building Structures ◽  
High Rise ◽  
Longitudinal Residual Stress

In recent years, due to its excellent mechanical properties, especially its insensitivity of strength to thickness, high-rise structural steel with high performance and heavy thickness made in china was applied more and more widely in large-span and high-rise steel building structures. However, there are no reasonable design indexes based on design reliability analysis for the new material in relevant national standards. The high-rise structural steel was often used as H-section column with heavy thickness at present, and its residual stress distribution has significant influence on load-carrying capacity, which is one of the critical factors in reliability analysis of elementary members using high-rise structural steel. In this paper, with the block sectioning method, a detailed experimental investigation on the longitudinal residual stress distribution for H-section (H800×800×80×80mm), made from Q345GJ high-rise structural steel with thickness of 80mm is introduced. The contour of residual stress distribution in the whole section based on test was presented, and the regularity of the residual stress distribution of such a section was discussed. Meanwhile, the contour of yielding strength distribution in the whole H-shaped section with heavy thickness was obtained. It will provide some basic data for reliability analysis and further investigation of the structural members using high-rise structural steel.

The Investigation of the Triaxial Residual Stress in the Friction Stir Welded Lap Joint Using Neutron Diffraction

2013 ◽  
Vol 768-769 ◽  
pp. 589-596
Author(s):  
Michael Bach ◽  
Ali Merati ◽  
Michael A. Gharghouri ◽  
Ronald Rogge ◽  
Robert Bell ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stress Distribution ◽  
Neutron Diffraction ◽  
Principal Direction ◽  
Alloy Sheet ◽  
Residual Stress Distribution ◽  
Lap Joint ◽  
Double Pass ◽  
Friction Stir ◽  
Principal Directions

A detailed study of the complex triaxial residual stress distribution of the double-pass friction stir welded (FSW) lap-joint between two different high strength aluminum alloy sheet materials was conducted. A non-destructive technique known as neutron diffraction was used to measure the internal residual stress distribution in the three principal direction of the lap-joint in the as-welded and hammer peened configurations to determine effects of hammer peening on redistribution of residual stresses across the weld. The residual stress variation across the weld in the transverse direction contained the highest values of tensile stress in all three principal directions. The residual stress in the hammer peened test specimen was in most cases reduced in all three principal directions.

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