DFMS: Dynamic fracture of materials and structures

Minisymposium organized by

Dynamic fracture of materials and structures is an important issue in the safety evaluation of structures under extreme loading. It is well known that most materials exhibit a dynamic response that is highly dependent on the loading rate. As the loading rate increases, the resistance increases and the failure mode changes. At least this can be observed in experimental tests. It is known that as the loading rate increases, the role of inertia increases at both the global and local (micro) levels. This affects the stress distribution and the fracture process. This mini-symposium aims to facilitate fruitful discussions and exchange of ideas and concepts between different approaches used by researchers in the fields of experiments, modeling and simulations. Contributions are welcome to discuss different perspectives on the same problems.

The minisymposium will discuss a number of fundamental questions that are not yet well understood, such as: How does strain rate affect material properties, strength, and fracture energy? What is the reason for the phenomena of crack branching and change in failure mode? What is the role of inertia? What is the maximum crack velocity in different materials? How does crack propagation affect the constitutive tensile law of concrete-like materials in quasi-static tests? What is the role of moisture and porosity? What is the role of aggregate shape and size? What is the effect of high temperature induced damage on dynamic response? What is the role of the rate-dependent constitutive law in the dynamic analysis of the structure? How should the effects observed in experimental tests be taken into account in the design of structures?

In addition, some technical aspects, experimental and numerical, are of great importance to improve our understanding of various phenomena. For example: What are the most efficient loading systems to measure dynamic crack propagation in experiments? How can we measure a dynamically propagating crack and can we observe the initiation of a dynamically loaded crack? What are the problems in objective evaluation of experimentally measured data? How can the influence of inertia be filtered out in experimental tests? What are reliable numerical models and approaches for simulating materials and structures under dynamic loading: cohesive crack models, X- FEM, EFG or SPH, finite element cancelation? Are multi-scale modeling approaches useful for modeling dynamic crack propagation, e.g., is it possible to predict crack rate sensitivity at the micro-scale of the material? What are the limitations of fragmentation simulations in terms of fragment size and residual velocities?

All contributions from the fields of experimental, numerical and theoretical research are welcome. In addition, presentations on industrial applications from the field are also of great interest and welcome.