A Numerical-Experimental Approach of Indentation Problem: Part II — Force-Dent Response of Polymeric Coated Steel Pipes

2017 ◽  
Author(s):  
Mario A. Polanco-Loria ◽  
Håvar Ilstad ◽  
Erik Levold
Keyword(s):  
Technology Development ◽  
Experimental Tests ◽  
Polymeric Coating ◽  
Coated Steel ◽  
Steel Pipes ◽  
Environmental Consequences ◽  
Reliable Assessment ◽  
Indentation Problem ◽  
Impact Events ◽  
Analytical Expressions

Accidents by trawling impact have the potential of environmental consequences, in terms of safety, monetary values and reputation. Aware of this situation a technology development plan on “Pipeline subject to high interference loads” has been established at STATOIL in close collaboration with GASSCO. The overall achievement is to adapt and introduce more reliable assessment methods in the load and response of pipelines under a trawling impact scenario. Polymeric coating systems have been manly designed and used as thermal isolating material for flow assurance; and little attention has been addressed to mechanical benefits to dissipate energy by large deformation. This property is of special interest to handle impact events typically found during the trawl board impact scenario. The experimental results show the beneficial effect of polymeric coating to protect the steel pipe against indentation when compared to an uncoated system. The results presented in this work focus on new developed analytical expressions to predict the force-dent response of polymeric coated steel pipes using a numerical-experimental research methodology. The proposed equations are validated against experimental tests and the findings indicate fairly good predictions.

A Numerical-Experimental Approach of Indentation Problem: Part I — Force-Dent Response of Steel Pipes

2017 ◽  
Author(s):  
Mario A. Polanco-Loria ◽  
Håvar Ilstad ◽  
Erik Levold
Keyword(s):  
Experimental Approach ◽  
Technology Development ◽  
Experimental Tests ◽  
Assessment Methods ◽  
Development Plan ◽  
Close Collaboration ◽  
Steel Pipes ◽  
Environmental Consequences ◽  
Reliable Assessment ◽  
Indentation Problem

Accidents by trawling impact have the potential of environmental consequences, in terms of safety, monetary values and reputation. Aware of this situation a technology development plan on “Pipeline subject to high interference loads” has been established at STATOIL in close collaboration with GASSCO. The overall achievement is to adapt and introduce more reliable assessment methods in the load and response of pipelines under a trawling impact scenario. This work includes a review of some known force-indentation models appeared in the literature. Some comments on the recently updated version of the DNV-RP-F111 document. Next, the description of the numerical results of 12 analyses of steel pipes studied is described and based on these results a new force-dent proposal is presented. The proposed equations are validated against experimental tests and the findings indicated fairly good predictions as indicated in the conclusions.

scholarly journals Application of Bonded Joints for Quantitative Analysis of Adhesion

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Jarmila Trpčevská ◽  
Mária Kollárová ◽  
Eva Zdravecká ◽  
Jana Tkáčová
Keyword(s):  
Steel Substrate ◽  
Zinc Coating ◽  
Experimental Tests ◽  
Coated Steel ◽  
Bonded Joints ◽  
Steel Sheets ◽  
Galvanized Coating ◽  
Zinc Coatings ◽  
Peel Tests

The performance of hot-dip coated steel sheets is associated with properties of the zinc coatings on steel substrate. For the characterization of the adhesion behaviour of zinc coating on steel various tests were employed. The study was focused on quantification assessment of galvanized coating adhesion to substrates. Methods for evaluation of the bonding strength of zinc coating by the shear strength and the T-peel tests applying four special types of adhesives were used. The experimental tests of bonded joints show that the adhesion of the zinc coating to the substrate was higher than that of the applied adhesive with the highest strength.

scholarly journals Numerical and Experimental Study on the Locally Blast Loaded Polyurea Coated Steel Plates

2019 ◽  
Vol 56 (3) ◽  
pp. 492-499
Author(s):  
Florina Bucur ◽  
Eugen Trana ◽  
Adrian Rotariu
Keyword(s):  
Experimental Tests ◽  
Cost Effective ◽  
Experimental Results ◽  
Steel Plates ◽  
Coated Steel ◽  
Quick Response ◽  
Blast Mitigation ◽  
Private Research ◽  
Set Up ◽  
Research Facilities

The damages and casualties inflicted by mine and IED attacks in security challenging areas generated a strong and quick response from nations all over the world. As a part of this response several national and private research facilities increased their efforts in identifying and implementing new ways or technologies to enable blast wave mitigation. The current paper aim to investigate the opportunity of using polyurea coated steel plates as a possible new blast mitigation approach, as suggested by several investigators. In order to objectively conclude about the ability of polyurea coated plates to sustain locally blast loads several experimental tests were performed according to STANAG 4569 demands for a 1/6 scaled plate structure. In order to numerically validate the experimental results several Autodyn simulations were set-up. The numerical and experimental results exibits a fair correlation, both pointing towards a dismiss of the idea of using polyurea coated steel plates as structural and cost effective blast mitigation approach.

Analytical and Experimental Analysis of Static Friction Forces of Moving Cables Inside Curved Pipes

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Eduardo A. W. de Menezes ◽  
Filipe P. Geiger ◽  
Eduardo A. Perondi ◽  
Javier M. Fernández ◽  
Hugo F. L. Santos
Keyword(s):  
Experimental Tests ◽  
Static Friction ◽  
Polymeric Coating ◽  
General Strategy ◽  
Friction Forces ◽  
Simulation Performance ◽  
Curved Pipes ◽  
New Equation ◽  
Umbilical Cable ◽  
Hydrate Plug

In-pipe robots are a powerful tool for hydrate plug removal inside ultradeepwater pipes. Most of these robots operate with the energy supplied by umbilical cables. The present work focuses on the development of a general strategy for computing the required forces for pulling such cables confined in ducts of generic length and geometry. Based on classical mathematical models applied in cable friction evaluation, a new equation set was developed and implemented in a computational algorithm designed to evaluate the static friction force related to the cumulative effects along the arbitrary set of curves present in a generic pipe. Therefore, the proposed computational routine can calculate the static friction forces associated with a cable inside a given pipe, whose coordinates are fed by the user. To evaluate the simulation performance, the achieved results were compared with the data obtained through experimental tests performed using a cable with polymeric coating positioned inside ducts. Different geometries, loads, and lubricating conditions were tested, and the analytical model could suitably estimate the required force to move an umbilical cable inside pipes.

IDENTIFICATION OF GRANULAR SOILS STRENGTH AND STIFFNESS PARAMETERS BY MATCHING FINITE ELEMENT RESULTS TO PMT DATA

2014 ◽  
Vol 11 (02) ◽  
pp. 1342001 ◽  
Author(s):  
Y. ABED ◽  
R. BAHAR ◽  
J.-C. DUPLA ◽  
DJ. AMAR BOUZID
Keyword(s):  
Finite Element ◽  
Experimental Tests ◽  
Loading Path ◽  
Soil Parameters ◽  
Model Parameters ◽  
Expansion Curve ◽  
The Difference ◽  
Strength And Stiffness ◽  
Analytical Expressions

This paper describes an efficient methodology for the identification of soil parameters using the combination of the finite element method and the in situ pressuremeter test (PMT). The objective of the procedure applied here is to identify the parameters of generalized Prager model associated with the Drucker and Prager failure criterion from a pressuremeter expansion curve. The approach consists of minimizing the function representing the difference between the experimental curve and the curve obtained by integrating the model along the loading path in the in situ testing. First, both analytical expressions governing the problem of cavity expansion and those related to the finite element modeling are given in detail. Then, a Fortran computer program called "Press-Sim" along with the solution strategy are described and clearly explained. The influence of some model parameters as well as the probe geometry on the computed pressuremeter curves is examined. The paper finishes by presenting some identification examples drawn from real experimental tests for which the targeted parameters are compared with those of other experimental procedures. Results of comparison show a very good agreement.

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