Solid Mechanics

Faculty of Engineering, LTH

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Hållfasthetslära AK I

Credits: 7.5. Compulsory for: M2 and M140p. Responsible teacher: Håkan Hallberg.
Prerequisites: Engineering Mechanics, Basic Course M, and Mathematics, Basic Course.
Teaching: Lectures 42 h, exercises 14 h, laboratory-work 2 h. Individual study: 140 h.
Assessment: A written examination, one compulsory hand-in assignment and one compulsory laboratory assignment. Study period: VT1


Please note that the course uses Live@Lund as web platform. Course material will only be available through Live@Lund to students who are registered on the course.

Aims of the course

The course aims at providing the basic introduction in the concepts and principles which are prerequisites for Basic Course M, part II. After finishing the course one should be able to:

  • use the concepts normal and shear force, bending and twisting moment, as well as account for and use the concepts normal and shear stress, normal and shear strain.
  • select a relevant constitutive model based on results from material tests and the problem at hand.
  • structure and solve statically indeterminate problems
  • account for the stress distributions which arise in applications of technical beam theory, and explain how they arise from assumed strain distributions at different constitutive relations.
  • calculate sufficient dimensions of beams, rods and struts with respect to criteria like plasticity, allowed deformations and stability.
  • account for the instability phenomena which arise in beam buckling.

Topics of the course

The course covers uniaxial stress and strain analysis with application to calculation of sufficient dimensions with respect to allowable stress and deformation in beams loaded in compression, elongation and bending, as well as rods loaded in twisting.

The basic concepts normal and shear stress and strain are defined. Based on measurents from uniaxial tensile test specimens, idealized material models exhibiting elastic, plastic and viscoelastic behavior are formulated. The difference between statically determinate and indeterminate problems is discussed with respect to methods of solution, and the need for conditions of deformation is recognized.

Elementary stability theory for axially loaded struts is discussed and dimensioning using the Euler elementary cases is introduced.


C. Ljung, N.S. Ottosen och M. Ristinmaa: Introduktion till Hållfasthetslära, Enaxliga tillstånd, Studentlitteratur, 2007
Handbok och formelsamling i Hållfasthetslära, KTH.


To qualify for a final grade in Basic Course M, students must have completed the compulsory assignment and the laboratory work. They must also have passed the written examination of Basic Course M, part I. The final grade is the average of the grades obtained in the Basic Courses part I and II.


The course is given by the division of Solid Mechanics. Questions can be addressed to the teachers in connection with lectures, seminars or exercises, or at the offices of the division.

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