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Master Thesis in solid mechanics; Weld/AM material effect on structural margins

Country:
Sweden
Work Location:
Trollhattan
Advertising End Date:
31 Dec 2017
Job Type:
Intern/Co-op
About The Opportunity
Master Thesis

Proposed thesis title: Weld/AM material effect on structural margins

Period of time and amount of credits: 30 credits/20 weeks

Number of students: 1

Start date: Jan/feb 2018

Assignment description:

The main task is to find guidelines when it is necessary to include the weld geometry/material properties in the FE-analysis and when it is necessary to use anisotropic models for additive material for typical space nozzle applications. The commercial FE-code Ansys will be used. Both simple FE-models and full nozzle models will be used through the project.  The analyses are nonlinear w.r.t. geometric effects and material behaviour. The structural margins that will be investigated includes crack initiation, strength (yield and ultimate), buckling and crack stability.

Background of thesis project:

The structural margins in welds and additive material (AM) are commonly evaluated by post-processing FE analyses results where the FE simulation has been performed using base material data, i.e. the weld is not apparent in the model. Usually knock-down factors are applied to the base material capability.

It is of interest to understand the following two main questions:

1.             How are the margins for welds affected by including the weld in the FE-analysis?

2.             How are the margins for additive material affected by modelling the AM-part with anisotropic material?

 
Key Responsibilities

Qualifications:

M.Sc. student. Recommended to have a background in Engineering Physics or Mechanical Engineering with interest in mechanical computations. Some experience in FEA is favourable.

Contact and application:

Send your resume and cover letter to Robert Tano, robert.tano@gknaerospace.com, +46 520 292763.

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