1. of a Novel Pipe Connection
Mechanical Analysis
of a Novel Pipe Connection

2. Outline Mechanical Analysis of a Novel Pipe Connection Introduction
Experimental Validation
Conclusions & Recommendations
I want to thank Professor Rixen for the introduction. For the up-coming 25 to 30 minutes I will try to explain what I did for my graduation project. By first I giving a short introduction of the origin of the project, explain what the aim is of the project and which approach that I took. For that approach I will only discuss the most important topics in my presentation, like the mechanical analysis of the novel pipe connection. Where I will try to explain what I did to meet my requirements, the aim of the project.
A model is still a model if there is no experimental validation, so it is very important to verify the model en hopefully it will become apparent why this is very important. Last but not least I treat the conclusions and recommendations.
After my presentation you will get the opportunity to ask questions, so please keep your questions until after the presention.

3. Introduction Mechanical Analysis of a Novel Pipe Connection Origin
Replace expensive screw-type of connections

4. Introduction Mechanical Analysis of a Novel Pipe Connection Objective
Develop a generic method to calculate:
manufacturing force
collapse strength

5. Introduction Mechanical Analysis of a Novel Pipe Connection Basic Idea
Sequence Forming Process

6. Approach Introduction Mechanical Analysis of a Novel Pipe Connection
Literature
Study
Material
Charaterization
Design Equipment
Layout and Die
Conclusions
&
Recommendations
Preliminary
Study
Refined
Analysis
Experimental
Validation

7. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Objective is to optimize the configuration:
Small : Collared Pipe 88.9 mm x 4 mm – Muff mm x 6.3 mm
Big : Collared Pipe mm x 4 mm – Muff mm x 6.3 mm
Optimalisation can easily be preformed on a Surface Response Function (SRF)
SRF is obtained with Finite Element Analysis by means of DOE

8. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Which Design Of Experiments (DOE) is used to find maximum collapse strength?
Why is material modelling important?
How is Finite Element Model (FEM) Build-up?
How do the design parameters influence the manufacturing forces and collapse strength?

9. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
LHD is able to capture trend of Response Surface (RS)
30 evaluation points are chosen in the 2D design space

10. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Higher stress for the same amount of total strain, results into a higher predicted force.
Therefore the real material behavior is very important

11. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection

12. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection

13. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Load Step 1

14. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Load Step 2

15. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Load Step 3

16. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Load Step 4

17. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Load Step 5

18. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Small Novel Pipe Connecting
Big Novel Pipe
Connection
Load Step 1
Manufacturing Force

19. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Small Novel Pipe Connecting
Big Novel Pipe
Connection
Load Step 3 Manufacturing Force

20. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Small Novel Pipe Connecting
Big Novel Pipe
Connection
Load Step 5
Collapse Strength

21. Refined Mechanical Analysis
Mechanical Analysis of a Novel Pipe Connection
Conclusions:
The design parameters R and θ does not really have an influence on the manufacturing force in the Load Step1
The design parameters R and θ does have a small influence on the manufacturing force in the Load Step3
The maximum Collapse Strength for the:
Small Novel Pipe Connection is for R = 8 and θ = 24
Big Novel Pipe Connection is for R = 9 and θ = 24

22. Experimental Validation
Mechanical Analysis of a Novel Pipe Connection
Design to be validated is chosen in between DOE points to include SRF in validation
How are the experiments Setup for the
Tube Sinking Process
Collapse Strength Verification
How well are the forces predicted compared to the experimental validation?

23. Experimental Validation
Test Setup Tube Sinking Experiments

24. Experimental Validation
Results Tube Sinking Experiments

25. Experimental Validation
Test Setup Collapse Experiments

26. Experimental Validation
Results Collapse Experiments
212 kN
205 kN

27. Conclusions Mechanical Analysis of a Novel Pipe Connection
The RS is a good approximation, because the predicted maximum:
manufacturing force is 6.1% off
collapse strength is 3.3 off
The found optimum for a:
Small Novel Pipe Connection is R = 8 and θ = 24
Big Novel Pipe Connection is R = 9 and θ = 24
Note: Prerequisites are valid for seamless tubes, same dimensional configuration and steel quality S355J2H
This approach can be used as a basis to create a more generic calculation method

28. Recommendations Mechanical Analysis of a Novel Pipe Connection
Duration test needs to be performed to get inside on the “relaxation” process of the novel pipe connection
Feasibility of welded tubes should be investigated and failure mode during the ultimate collapse test

29. Questions