Mechanical Analysis of a Novel Pipe Connection Martin

Mechanical Analysis of a Novel Pipe Connection Martin Sadhinoch 1

Outline Mechanical Analysis of a Novel Pipe Connection • Introduction • Mechanical Analysis • Experimental Validation • Conclusions & Recommendations Martin Sadhinoch 2

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

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

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

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

Refined Mechanical Analysis of a Novel Pipe Connection • Objective is to optimize the configuration: • Small : Collared Pipe 88. 9 mm x 4 mm – Muff 114. 3 mm x 6. 3 mm • Big : Collared Pipe 114. 3 mm x 4 mm – Muff 137. 9 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 Martin Sadhinoch 7

Refined 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? Martin Sadhinoch 8

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

Refined 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 Martin Sadhinoch 10

Refined Mechanical Analysis of a Novel Pipe Connection Martin Sadhinoch 11

Refined Mechanical Analysis of a Novel Pipe Connection Martin Sadhinoch 12

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

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

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

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

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

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

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

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

Refined 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 Step 1 • The design parameters R and θ does have a small influence on the manufacturing force in the Load Step 3 • 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 Martin Sadhinoch 21

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? Martin Sadhinoch 22

Experimental Validation Test Setup Tube Sinking Experiments Martin Sadhinoch 23

Experimental Validation Results Tube Sinking Experiments Martin Sadhinoch 24

Experimental Validation Test Setup Collapse Experiments Martin Sadhinoch 25

Experimental Validation Results Collapse Experiments 212 k. N 205 k. N Martin Sadhinoch 26

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 S 355 J 2 H • This approach can be used as a basis to create a more generic calculation method Martin Sadhinoch 27

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 Martin Sadhinoch 28

Questions Martin Sadhinoch 29