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Fragmentation analysis of a bar with the Lip-field approach

Journal Article · · Mechanics of Materials
 [1];  [2];  [3]
  1. Ecole Centrale Nantes (France); Institut Univ. de France (IUF), Paris (France)
  2. Ecole Centrale Nantes (France)
  3. Sandia National Lab. (SNL-CA), Livermore, CA (United States)

The Lip-field approach was introduced in Moës and Chevaugeon (2021) as a new way to regularize softening material models. It was tested in 1D quasistatic in Moës and Chevaugeon (2021) and 2D quasistatic in Chevaugeon and Moës (2021): this paper extends it to 1D dynamics, on the challenging problem of dynamic fragmentation. The Lip-field approach formulates the mechanical problem to be solved as an optimization problem, where the incremental potential to be minimized is the non-regularized one. Spurious localization is prevented by imposing a Lipschitz constraint on the damage field. Here, the displacement and damage field at each time step are obtained by a staggered algorithm, that is the displacement field is computed for a fixed damage field, then the damage field is computed for a fixed displacement field. Indeed, these two problems are convex, which is not the case of the global problem where the displacement and damage fields are sought at the same time. The incremental potential is obtained by equivalence with a cohesive zone model, which makes material parameters calibration simple. A non-regularized local damage equivalent to a cohesive zone model is also proposed. It is used as a reference for the Lip-field approach, without the need to implement displacement jumps. These approaches are applied to the brittle fragmentation of a 1D bar with randomly perturbed material properties to accelerate spatial convergence. Both explicit and implicit dynamic implementations are compared. Favorable comparison to several analytical, numerical and experimental references serves to validate the modeling approach.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003525
OSTI ID:
1883189
Alternate ID(s):
OSTI ID: 1871767
Report Number(s):
SAND2022-6656J; 706282
Journal Information:
Mechanics of Materials, Journal Name: Mechanics of Materials Vol. 172; ISSN 0167-6636
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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