SASCOM Courses - Composites delamination: modelling and characterisation

DAY 1: January, 25th, 2022

Lecture 1:

  • Introduction to delamination
  • Modelling interface cracks:
    • crack propagation modes
    • traction-separation behaviour
    • initiation, propagation, cohesive length
    • limit case: linear elastic fracture mechanics

Lecture 2:

  • Linear elastic fracture mechanics:
    • hypotheses and derivation
    • strain energy release rate and dissipated energy
    • stable and unstable crack propagation
  • Illustration: modelling the Double Cantilever Beam (DCB) test

Optional homework:

post-treatment of DCB test data according to ASTM standard


DAY 2: February, 1st, 2022

Lecture 3: 

  • Characterisation tests for composites delamination
    • DCB test standard (homework correction)
    • Mode II standards: 3- and 4- point End Notched Flexure (ENF)
    • Mixed mode standards: Mixed Mode Bending (MMB)
    • limitations

Lecture 4:

  • Characterisation tests for adhesives debonding
    • Climbing Drum Peel (CDP) test for sandwich debonding
    • Peel tests
    • Other testing configurations

 

About the Speaker

Federica Daghia is Associate Professor (Maître de Conférences HDR) at the École Normale Supérieure Paris-Saclay, in France. She earned her PhD in 2008 from the University of Bologna, in Italy, and her Habilitation in 2016 from École Normale Supérieure de Cachan, in France. Between 2016 and 2021, she was member of the French National Committee for Scientific Research (CoNRS) – Mechanics Section. Since 2016, she is Secretary of the French Society for Composites Materials (AMAC).

Her research interest involve the physics-based modeling of damage and failure of composite and architectured materials, from experimental characterisation to numerical simulation.

By Dr. Federica Daghia

  • École Normale Supérieure Paris-Saclay, France

Note: the registration is closed


SASCOM Courses - Introduction to Composite Materials

st lecture, Nov 2, 2021

  • Constituent materials, manufacturing processes and semi-products.
  • Matrices, fibers and interfaces. Role and selection of the constituents.
  • Properties of the constituents; effects of fiber sizing.
  • Semi-products: short-fiber, SMC, NCF, textiles and pre-pregs.
  • Examples of applications of different types of composite materials.
  • Processes for thermoset-based composites: RTM, autoclave, resin infusion, pultrusion, filament winding.
  • Processes for thermoplastic-based composites: automatic tape laying, stamp forming.
  • Additive manufacturing of composite materials.
  • Effects of manufacturing defects.

nd lecture, Nov 9, 2021

  • Mechanical behavior and characterization.
  • Properties of composite systems and how to measure them. Characterization of the mechanical properties of the constituents, fiber, matrix and interface. Mechanical tests from coupon to sub-component. Building-block approach.

rd lecture, Nov 16, 2021

  • Classical lamination theory.
  • Lamina stiffness, stiffness of symmetric laminates, stiffness of general laminates, warpage. Invariant-based approach to stiffness.

th lecture, Nov 23, 2021

  • Designing with composite materials.
  • Failure mechanisms. Ply-based failure criteria. Last-ply failure of multidirectional laminates. Omni-envelope approach. Effects of stress concentrations. Point- and average-stress methods. Finite Fracture Mechanics. Damage tolerance design

About the Speakers

Albertino Arteiro received a Master’s Degree in Mechanical Engineering – Specialisation in Structural Engineering and Machine Design – from the Faculty of Engineering – University of Porto in 2012, and a Doctoral Degree in Mechanical Engineering (cum Laude) from the same University in 2016, during which he was a Visiting Student Researcher at the Department of Aeronautics and Astronautics of Stanford University. He was awarded the Best PhD Thesis by the Portuguese Association of Theoretical, Applied and Computational Mechanics (APMTAC).

Albertino Arteiro was appointed Assistant Professor at the Materials and Technological Processes Group of the Department of Mechanical Engineering (DEMec) of the Faculty of Engineering – University of Porto in 2019. He is currently a member of the ECCOMAS Young Investigators Committee.

His research interests include material modelling at different length-scales, design and analysis of composite systems based on new concepts, and composites manufacturing.

Pedro Camanho (MSc in Mechanical Engineering, UPorto, 1995) received his PhD in Composite Materials from the Department of Aeronautics, Imperial College London, UK, in 1999. In the same year he joined the Institute of Mechanical Engineering and Industrial Management (INEGI – www.inegi.up.pt) as Director of the Structural Integrity Unit and the Department of Mechanical Engineering of the University of Porto as Assistant Professor. Since 2014 he has been Full Professor at the Department of Mechanical Engineering of the University of Porto. Pedro Camanho is currently the President of the Associated Laboratory in Energy, Transportation and Aeronautics (LAETA), and the Vice-President of INEGI.

The main research interests of Pedro Camanho are the mechanics of deformation and fracture of advanced polymer composite materials, and new concepts for lightweight composite materials and structures for aerospace applications such as hybrid, nano-structured, multi-functional, variable-stiffness, energy-storage and ultra-thin composites.

By Prof. Albertino Arteiro & Prof. Pedro Camanho

  • INEGI, University of Porto