Single-Course English 5 ECTS

Composite Materials and Fibres

Overall Course Objectives

– To give the students thorough knowledge of materials structures and properties, with special emphasis on fibres and their function in composite materials
– To give the students insight into the micromechanical models describing the function and properties of composite materials
– To make the students capable of selecting composite materials with specific property profiles
– To give the students improved skills in oral communication of engineering topics

Learning Objectives

  • Describe and calculate the mechanical properties of materials based on their chemistry and structure
  • Explain and calculate the effect of defects on material strength, and identify the methods of obtaining strong fibres
  • Describe the chemistry and structure, processing and properties of practically relevant fibres in composites (glass, carbon, cellulose, polyethylene)
  • Explain scatter in strength of fibres by a statistical method (Weibull), and use the method to calculate the scale effects of fibre strength
  • Convert between weight and volume fractions in composites, and understand the relationship between volume fractions of fibres, matrix and porosity, in composites with different fibre weight fractions
  • Describe and calculate the load distribution and load transfer in unidirectional composites with continuous and non-continuous fibres
  • Calculate stiffness of composites with a given composition and configuration, and design of composites in relation to specific property profiles
  • Explain and calculate the strength of unidirectional composites with micromechanical models predicting single and multiple fracture
  • Identify and estimate the work of fracture of unidirectional composites from the mechanisms of debonding, elastic stretching and fibre pull-out

Course Content

Introduction to strong and light materials; theoretical maximum strength of materials; the effect of defects on practical lower strength; reinforcement of materials; principles of reinforcement with inclusions, in particular fibres; relevant fibres, their structure, fabrication, and properties; statistical analysis of fibre strength; volumetric composition of composite materials, in particular porosity; micromechanical models for composite materials; load transfer between fibre and matrix; critical fibre length; debonding and fibre pull-out energy for composite materials; single and multiple fracture; stiffness, strength and fracture energy for composite materials.

Recommended prerequisites


Teaching Method

Lectures, discussions, exercises

See course in the course database.





13 weeks




DTU Lyngby Campus

Course code 46420
Course type Candidate
Semester start Week 35
Semester end Week 48
Days Mon 13-17

7.500,00 DKK