Hot-spot stress determination of tubular arch bridge joints using strain gauges

2013 ◽  
Vol 55 (12) ◽  
pp. 681-687
Author(s):  
D Stael ◽  
H De Backer ◽  
P Van Bogaert
Keyword(s):  
Hot Spot ◽  
Strain Gauges ◽  
Stress Determination ◽  
Hot Spot Stress ◽  
Arch Bridge ◽  
Bridge Joints

Fatigue design using the structure stress concept for welded metal structures

2021 ◽  
Author(s):  
Niclas Rausch ◽  
Martin Mensinger
Keyword(s):  
Hot Spot ◽  
Local Stress ◽  
Correction Factors ◽  
Stress Determination ◽  
Hot Spot Stress ◽  
Static Tests ◽  
Metal Structures ◽  
Solution Strategies ◽  
Fatigue Design ◽  
Element Approach

<p>Due to the progress in FE calculations, local stress increases of welded metal structures can be evaluated more precisely using the structure stress approach (hot-spot stress concept). Inadequate regulations, however, lead to significant uncertainties with this approach. There is a deficiency in instructions on modelling, stress determination and methods for dealing with misalignment and thickness influences. Therefore, difficulties regarding the structure stress concept are pointed out and possible solution strategies are presented. To reduce uncertain influences from modelling, correction factors are specified based on the element approach, extrapolation rule and thickness. A series of static tests is carried out specifically for this purpose. The objective is to develop conclusive regulations for the hot-spot stress concept and evaluate it as an additional normatively anchored method for fatigue safety.</p>

Overview of the FPSO: Fatigue Capacity JIP

2002 ◽  
Author(s):  
Pa˚l G. Bergan ◽  
Inge Lotsberg ◽  
Wolfgang Fricke ◽  
Michel Franc¸ois ◽  
Henryk Pisarski
Keyword(s):  
Fatigue Crack ◽  
Fatigue Testing ◽  
Hot Spot ◽  
Measurement Data ◽  
Fillet Welds ◽  
Hot Spot Stress ◽  
Actual Measurement ◽  
Stress Evaluation ◽  
Service Inspection

This paper presents an overview of a joint industry project carried out in the period 2001 – 2003 to address the Fatigue Capacity of FPSOs. Numerical investigations and fatigue testing is performed in order to improve the accuracy, robustness and efficiency of finite element modeling and hot spot stress evaluation for typical FPSO details. Design criteria will be developed for fatigue crack growth from the root of fillet welds in typical details in FPSOs including fillet welds around attachments and fillet welds around pipes penetrating deck plates. Fatigue analysis methods for FPSOs with guidelines on determination of side pressures in the water line will be developed. This work will be supported by assessment of actual measurement data from the field and testing in a tank. Methods for planning in-service inspection of FPSOs based on a fracture mechanics and reliability analysis will be developed. Also a procedure for repair of a fatigue crack while the FPSO is on station in the field will be developed.

Hot spot stress investigation on rib-to-deck-to-floor beam connections in UHPC reinforced OSDs

2021 ◽  
Vol 179 ◽  
pp. 106517
Author(s):  
Bin Cheng ◽  
Hesham Abdelbaset ◽  
Liang Tian ◽  
Hai-Ting Li ◽  
Qingtian Su
Keyword(s):  
Hot Spot ◽  
Hot Spot Stress

DESTRUCTIVE METHODS FOR DETERMINING RESIDUAL STRESSES (review)

2021 ◽  
pp. 95-104
Author(s):  
A.D. Monakhov ◽  
◽  
N.O. Yakovlev ◽  
V.V. Avtaev ◽  
E.A. Kotova ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Residual Stresses ◽  
Speckle Interferometry ◽  
Image Correlation ◽  
Strain Gauges ◽  
Contact Method ◽  
Layer By Layer ◽  
Deep Hole ◽  
Destructive Methods

The paper presents an overview of methods for determining residual stresses. Methods such as splitting and segmentation, layer-by-layer removal, slitting (cutting, pliability), profiling, drilling holes (including a «deep» hole) are considered. The description of the methods for mea-suring the deformation used in the determination of residual stresses is given. The most common contact method using strain gauges, as well as non-contact methods: polarization-optical (photo-elasticity), optical speckle interferometry, digital image correlation.

scholarly journals Methods for Structural Stress Determination according to EN 13445-3 Annex NA – Comparison with other Codes for Unfired Pressure Vessels

2018 ◽  
Vol 165 ◽  
pp. 10003
Author(s):  
Ralf Trieglaff ◽  
Jürgen Rudolph ◽  
Martin Beckert ◽  
Daniel Friers
Keyword(s):  
Pressure Vessel ◽  
Pressure Vessels ◽  
Structural Stress ◽  
Stress Determination ◽  
User Friendliness ◽  
Fatigue Assessment ◽  
Shell Elements ◽  
European Working ◽  
The Status

The European Pressure Vessel Standard EN 13445 provides in its part 3 (Design) a simplified method (Clause 17) and a detailed method for fatigue assessment (Clause 18). Clause 18 “Detailed Assessment of Fatigue Life” is under revision within the framework of the European working group CEN/TC 54/WG 53 – Design methods with the aim of reaching a significant increase in user-friendliness and a clear guideline for the application. This paper is focused on the new informative annex NA ”Instructions for structural stress oriented finite elements analyses using brick and shell elements”. As an essential amendment for the practical user, the determination of structural stress ranges for fatigue assessment of welds is further specified in this new annex. Different application methods for the determination of structural stresses are explained in connection with the requirements for finite element models and analyses. This paper will give a short overview of the proposed approaches of structural stress determination in annex NA of the revised EN 13445-3. It will present the status of the approaches based on the results of fatigue analyses according to EN 13445-3 Clause 18 for different application examples. For verification purposes, the results of the approaches proposed in EN 13445-3 are compared with the results of other pressure vessel design codes for nuclear and non-nuclear application.

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