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Crack Modelling and Regularisation
Continuum mechanics generally restricts to structures with continuous deformations. But due a limited tensile strength concrete is characterized by cracking as regular behavior. This is not a sudden event but occurs in a process leading gradually from continuous to discontinuous displacement fields. The chapter introduces the fictitious crack concept to treat complex transitions from micro‐ to macro‐cracking within the framework of continuum mechanics. This is connected with a softening behaviour, i.e. decreasing stresses with increasing deformations. Softening implies two fundamental aspects regarding the FEM: mesh dependency and discontinuity modeling due to cracking. Mesh dependency requires regularization to reach valid simulation results. The chapter presents the generally known regularization procedures. Furthermore, numerical methods for explicit modelling of displacement discontinuities are summarized and in particular specified with the strong discontinuity approach (SDA).
Crack Modelling and Regularisation
Continuum mechanics generally restricts to structures with continuous deformations. But due a limited tensile strength concrete is characterized by cracking as regular behavior. This is not a sudden event but occurs in a process leading gradually from continuous to discontinuous displacement fields. The chapter introduces the fictitious crack concept to treat complex transitions from micro‐ to macro‐cracking within the framework of continuum mechanics. This is connected with a softening behaviour, i.e. decreasing stresses with increasing deformations. Softening implies two fundamental aspects regarding the FEM: mesh dependency and discontinuity modeling due to cracking. Mesh dependency requires regularization to reach valid simulation results. The chapter presents the generally known regularization procedures. Furthermore, numerical methods for explicit modelling of displacement discontinuities are summarized and in particular specified with the strong discontinuity approach (SDA).
Crack Modelling and Regularisation
Häussler‐Combe, Ulrich (author)
Computational Structural Concrete ; 201-247
2022-10-20
47 pages
Article/Chapter (Book)
Electronic Resource
German
| Engineering Index Backfile | 1937
| Engineering Index Backfile | 1937