ASM Chicago Regional Chapter Guest Lecture

When:  Jun 12, 2021 from 11:00 to 12:30 (CT)

Failure in realistic composite structures: A long journey to safety

Christos Kassapoglou Professor of Design of Composite Structures
Department of Aerospace Engineering
Chair of Aerospace Structures and Computational Mechanics
Delft University of Technology


Structural failure has something irrevocable about it:  By the time it occurs, it is too late to do something about it.  Designing around failure and predicting failure require deep understanding of failure processes, advanced, and often complex, simulations, and a lot of expensive and time consuming tests.  Despite a lot of progress over the past 150 years we never cease to be surprised.  In the case of composite materials, the situation is even more challenging than in metals.  The multiplicity of failure modes of realistic composite structures and the fact that we still do not understand many of them, combine to create a nearly unsolvable problem:  How do we put together a composite structure such that, by the time we do a full-scale test the risk of surprise and failure is minimized all the while staying within budget and being competitive?  In this presentation, an attempt will be made to show the state of the art in this area by discussing:

  • Practices for accounting for failure in design of composite structures
  • Trade-offs between (over-conservative) design and cutting edge optimization
  • The price for accuracy (computational cost, cost of experiments)
  • Sequencing of failure modes for benign failure and residual strength

We have made a lot of progress over the years but we still have a long way to go…


Speaker Bio

 Professor of Design of Composite Structures at the Aerospace Structures and Computational Mechanics Chair of the Aerospace Engineering Department at Delft University of Technology.  Prior to that, 24 year experience in US industry (Beech Aircraft, Sikorsky Aircraft, independent consultant) specializing on design and analysis of composite structures, minimum weight and cost designs, damage tolerance and fatigue of composites.  Two books on Design and Analysis of Composite Structures and Modeling the Effect of Damage in Composite Structures (both published by Wiley).  Four patents.  BS and two MS degrees from MIT.  PhD degree from Delft University of Technology.



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