# SD2411 Lightweight Structures and FEM 8.0 credits

#### Lättkonstruktioner och FEM

Foundations of structural mechanics, analysis of thin-walled stiffened shells, plates, stability theory and introduction to finite element methods.

### Offering and execution

#### No offering selected

Select the semester and course offering above to get information from the correct course syllabus and course offering.

## Course information

### Content and learning outcomes

#### Course contents *

Analysis of structural elements and design methods for lightweight structures. Introduction to the finite element method. Bending, shear, torsion and warping of open and closed thin-walled beams, with and without stiffeners. Kirchhoff plate theory. Local and global instability of beams and thin plates.

#### Intended learning outcomes *

The course will give the student basic knowledge of the structural behaviour of beams, plates and shells, and the analysis and design of these types of structures, specifically, strength, stiffness, and weight issues for unstiffened and stiffened thin-walled structures.

After the course the student should be able to

• explain the function and application of different structural elements in lightweight structures
• from a given problem statement, chose an appropriate lightweight structural element with respect to functionality and weight
• analyse and design thin-walled beams and stiffened shells with respect to strength, stiffness and structural stability
• comfortably work with concepts from basic courses in solid mechanics, such as centre of gravity and moments of inertia, as well as more advanced concepts introduced in this course, such as shear flow, warping and different buckling mechanisms
• describe the principles of finite element codes and use them for analysis of basic structural elements
• write a small finite element code in MatLab and use it to analyse beam problems
• explain discrepancies in results from different analytical methods through knowledge about the different approximations they involve

#### Course Disposition

No information inserted

### Literature and preparations

#### Specific prerequisites *

Calculus, differential equations, linear algebra, solid mechanics, strength of materials and basic computer programming skills. Some previous experience of FEM and Matlab programming is also beneficial but not formally required.

#### Recommended prerequisites

No information inserted

#### Equipment

No information inserted

#### Literature

Megson, T.H.G., Aircraft structures for engineering students, 4th Edition, Edward Arnold 2007. (2nd or 3rd edition work too except for page and chapter references.)

Compendiums

### Examination and completion

A, B, C, D, E, FX, F

#### Examination *

• LAB1 - Laboratory Work, 2.0 credits, Grading scale: P, F
• LAB2 - Laboratory Work, 2.0 credits, Grading scale: P, F
• TEN1 - Examination, 4.0 credits, Grading scale: A, B, C, D, E, FX, F

Based on recommendation from KTH’s coordinator for disabilities, the examiner will decide how to adapt an examination for students with documented disability.

The examiner may apply another examination format when re-examining individual students.

•  LAB1 - Laboratory Work, 2.0 credits, grade scale: P, F

•  LAB2 - Laboratory Work, 2.0 credits, grade scale: P, F

•  TEN1 - Examination, 4.0 credits, grade scale: A, B, C, D, E, FX, F

#### Other requirements for final grade *

Written exam (TEN1; 4 credits), computer assignments (ÖVN1 and ÖVN2; 2+2 credits).

#### Opportunity to complete the requirements via supplementary examination

No information inserted

#### Opportunity to raise an approved grade via renewed examination

No information inserted

### Further information

#### Course web

Further information about the course can be found on the Course web at the link below. Information on the Course web will later be moved to this site.

Course web SD2411

#### Offered by

SCI/Aeronautical and Vehicle Engineering

#### Main field of study *

No information inserted

#### Education cycle *

Second cycle

SD2413 Fibre Composites – Analysis and Design

SD2416 Structural Optimisation and Sandwich Design

SD2432 Lightweight Design

SD2450 Biomechanics and Neuronics

#### Ethical approach *

• All members of a group are responsible for the group's work.
• In any assessment, every student shall honestly disclose any help received and sources used.
• In an oral assessment, every student shall be able to present and answer questions about the entire assignment and solution.