Large-scale 3D modeling of projectile impact damage in brittle plates

In the second example considered, we investigate the fracture patterns in normal impact of spheres on thin, unconfined ceramic plates over a wide range of loading rates

A. Seagraves

2015

Key concepts

Scholarcy highlights

  • The damage and failure of brittle materials subjected to impact loads is characterized by the development of intricate patterns of three-dimensional cracks
  • The damage and failure of brittle plates subjected to projectile impact is investigated through large-scale three-dimensional simulation using the DG/CZM approach introduced in
  • In the second example considered, we investigate the fracture patterns in normal impact of spheres on thin, unconfined ceramic plates over a wide range of loading rates
  • For both the edge-on and normal impact configurations, the full field description provided by the simulations is used to interpret the mechanisms underlying the crack propagation patterns and their strong dependence on loading rate
  • Cracks are driven by complex dynamic stress fields which arise as a result of stress wave propagation
  • In order to gain insight into this problem, there has been a strong effort over the last fourty years to study impact damage through plate impact experiments where the cracking patterns were analyzed in recovered specimens
  • The experiments show the same fracture modes observed in the simulation, including a localized fragmented zone under the impactor, radial cracks, a box-shaped cracking pattern, and localized cracking at the specimen edges which results in rectangular fragments

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