Numerical modelling of pipe internal stresses induced during the coating process – Influence of pipe geometric characteristics on stress state

2013 ◽  
Vol 52 ◽  
pp. 429-440 ◽  
Author(s):  
M.R. Tchoquessi Diodjo ◽  
L. Belec ◽  
E. Aragon ◽  
F.X. Perrin ◽  
M. Bonnaudet ◽  
...  
Keyword(s):  
Stress State ◽  
Numerical Modelling ◽  
Internal Stresses ◽  
Coating Process ◽  
Geometric Characteristics

3D Numerical Modelling of a Dip-coating Process by a Multidomain Macroscopic Approach

2007 ◽  
Vol 10 (3) ◽  
pp. 337-359
Author(s):  
Jérôme Bikard ◽  
José de Oliveira ◽  
Cyril Chaudemanche ◽  
Tatiana Budtova
Keyword(s):  
Numerical Modelling ◽  
Dip Coating ◽  
Coating Process ◽  
3D Numerical Modelling ◽  
Macroscopic Approach

Internal Stresses in Plasma Coatings with an Amorphous Structure

1998 ◽  
Author(s):  
Y. Borisov ◽  
V. Korzhyk
Keyword(s):  
Stress State ◽  
Boron Content ◽  
Amorphous Structure ◽  
Internal Stresses ◽  
Compressive Stresses ◽  
Stress Formation ◽  
Coating Layers ◽  
Plasma Sprayed ◽  
Amorphous Coatings ◽  
Material Temperature

Abstract The stress state of plasma sprayed amorphous coatings of the Fe-B based alloys with the boron content of 15-35 %, as well as of the above type alloys but with additions of Ni, Cr, Mo, was studied. Internal stresses depend on the type of a plasma gas, thickness and composition of the coatings, material, temperature and conditions of additional cooling of the substrate. Additional cooling of the substrate was found to be the most efficient method of decreasing the internal stress. Formation of compressive stresses in the coating layers adjoining the substrate is shown to lead to 25-30 % increase in its fatigue strength under alternating loads.

Residual Stress State at Different Scales in Deep Drawn Cup of Unstable Austenitic Steel

2006 ◽  
Vol 524-525 ◽  
pp. 95-100 ◽  
Author(s):  
M. Reda Berrahmoune ◽  
Sophie Berveiller ◽  
Karim Inal ◽  
Etienne Patoor
Keyword(s):  
Stress State ◽  
Residual Stresses ◽  
Austenitic Steel ◽  
Deep Drawing ◽  
Complex Loading ◽  
Tensile Tests ◽  
Loading Path ◽  
Internal Stresses ◽  
Drawing Ratio ◽  
Unstable Austenitic Steel

In this study, residual stresses state at different scales in the 301LN unstable austenitic steel after deep drawing was determined. The first part of the work deals with the characterization of the martensitic transformation during uniaxial loading. The austenite/martensite content which was determined by X-Ray Diffraction increases until a maximum of 0.6 for 30% strain. Internal stress distribution was determined by coupling in-situ tensile tests with sin²ψ method. As soon as martensite appears, the magnitudes of the internal stresses in this phase were found to be 400 MPa higher than in the austenite. To establish a relation between the complex loading path effect and the phase stress state, deep drawing tests were carried out for different drawing ratios. Both macroscopic tangential residual stresses and residual stresses in the martensite were determined. It appears that the macroscopic tangential residual stresses are positive and increase with increasing drawing ratios and the maximum value is located at middle height of the cup. It is about 850MPa for the Drawing Ratio (DR)=2.00. The tangential residual stresses in the martensite were found to be positive in the external face and have a same evolution as the macroscopic ones.

Estimation of the Probability of Cracking of Facade Coatings

2021 ◽  
Vol 1037 ◽  
pp. 675-683
Author(s):  
Valentina Loganina ◽  
Roman Fediuk ◽  
Daniil Taranov ◽  
Y.H. Mugahed Amran
Keyword(s):  
Stress State ◽  
Internal Stresses ◽  
Shear Stresses ◽  
Curing Process ◽  
Normal Stresses ◽  
Seasonal Fluctuations ◽  
Subsequent Increase ◽  
Exponential Decrease ◽  
Heavyweight Concrete ◽  
Façade Coatings

Information on the stress state of protective and decorative coatings during the curing process, in particular on the cohesive state of destruction, is given. The influence of the type of substrate on the change in internal stresses in the coating is considered. It was revealed that the greatest value of shear stresses is observed in coatings on a heavyweight concrete substrate. The subsequent increase in temperature after curing to 50°C leads to an increase in the value of the normal stresses. The probability of cracking of coatings during thermal aging is estimated. It was revealed that during aging there is an exponential decrease in the cohesive strength of coatings and an increase in internal stresses. Aging tends to increase the likelihood of cracking of coatings. The change in stresses in coatings as a result of seasonal fluctuations in air temperature is considered.

scholarly journals Elastic deformation of twinned microstructures

2017 ◽  
Vol 473 (2204) ◽  
pp. 20170330 ◽  
Author(s):  
Steffen Pfeiffer ◽  
Martin Franz-Xaver Wagner
Keyword(s):  
Stress State ◽  
Local Stress ◽  
External Loading ◽  
Internal Stresses ◽  
Slip Systems ◽  
Orientation Relationships ◽  
Crystalline Materials ◽  
Dislocation Plasticity ◽  
Local Stress State ◽  
Applied Stresses

Many crystalline materials exhibit twinned microstructures, where well-defined orientation relationships define the special symmetry between different, elastically anisotropic twin variants. When such twins are subjected to external loading, additional internal stresses necessarily occur at the twin boundaries in order to maintain compatibility. These compatibility stresses are constant inside each variant in repeating stacks of twins and considerably affect the local stress state. In this paper, we use anisotropic linear elasticity to derive general analytical solutions for compatibility stresses in a stack of twin variants in arbitrary materials, for arbitrary variant volume fractions and twin types, subjected to arbitrary applied stresses. By considering two examples, growth twins in electrodeposited Cu and B19′ martensite twins in the shape memory alloy NiTi, we further demonstrate that compatibility stresses can considerably alter the preferred slip systems for dislocation plasticity as well as the effective macroscopic behaviour of twinned microstructures.

Measurement of Residual Stresses in Work and Backup Rolls for Strip and Plate Mills and its Effect on the Final Load Situation

2014 ◽  
Vol 622-623 ◽  
pp. 949-955 ◽  
Author(s):  
Michael Hinnemann ◽  
Paul Josef Mauk ◽  
Vyacheslav Goryany ◽  
Christian Zybill ◽  
Rolf Braun
Keyword(s):  
Residual Stress ◽  
Stress State ◽  
Residual Stresses ◽  
Measurement Techniques ◽  
High Speed Steel ◽  
Core Material ◽  
Steel Shell ◽  
Internal Stresses ◽  
Residual Stress State ◽  
Work Rolls

Internal stresses or residual stresses remain in almost every part after manufacturing and/or further processing. Even if the entire stress state inside a system is in an equilibrium, single stresses due to their direction and strength may have positive or negative influences to the properties of a body. Especially in big parts, the residual stress state is relatively unknown, because it can only be determined by destructive methods as sectioning or slitting. The possibility of the use of non destructive measuring methods is only given for surface near regions or thin parts and not useful for the specification of the entire residual stress state inside a large compound work roll. This paper outlines an approach for the determination of residual stresses in centrifugal casted work rolls with an indefinite chill double poured or high speed steel shell. In several steps, different measurement techniques are tested and the results are to be presented. Beside the residual stress state, which is caused by manufacturing or heat treatment, these work rolls with different shell and core material differ in their thermophysical and elastic properties. These parameters in combination with the residual stress state and the thermal and load stresses, which arise during the hot rolling process, are causing a complex stress field that is presented by a combined model for work and backup rolls in operation.

Stress Dependence of Switching Field during the Devitrification of Finemet-Based Magnetic Microwires

2013 ◽  
Vol 543 ◽  
pp. 495-498 ◽  
Author(s):  
J. Olivera ◽  
Rastislav Varga ◽  
J. Anaya ◽  
Arkadi Zhukov
Keyword(s):  
Stress State ◽  
Thermal Treatment ◽  
Internal Stresses ◽  
Thermal Treatments ◽  
Stress Dependence ◽  
Switching Field ◽  
Microstructural Characteristics ◽  
Adequate Treatment ◽  
Magnetostriction Constant ◽  
Non Destructive

We have studied the influence of the thermal treatment on the stress dependence of the switching field during the devitrification of amorphous Fe73.5Cu1Nb3Si11.5B11 microwires. The non-destructive test (NDT) method based on the magnetization reversal of ferromagnetic materials is sensible to changes in microstructural characteristics and the stress state of the material. The stress dependence has been explained considering the magnetoelastic contribution to the switching mechanism which is modified applying the tensile stresses and changing the magnetostriction constant and strength of the internal stresses distribution through thermal treatments. We show that by properly setting a frequency during the measurement and adequate treatment of the sample, it is possible to vary the sensitivity, magnitude and stress dependence of the sample. Keywords: Magnetic bistability, glass-coated microwires, switching field, stress sensor

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