Abstract
We discuss some principle concepts of damage mechanics and outline a possibility to address the open question of the damage-to-deformation relation by suggesting a parameter identification setting. To this end, we introduce a variable motivated by the physical damage phenomenon and comment on its accessibility through measurements. We give an extensive survey on analytic results and present an isotropic irreversible partial damage model in a dynamic mechanical setting in form of a second-order hyperbolic equation coupled with an ordinary differential equation for the damage evolution. We end with a note on a possible parameter identification setting.
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- 1.
Especially in the mechanics of solids, there are so-called anisotropic properties, whose response to external influences depends on the direction of those influences. Properties that do not show this directional dependency are referred to as isotropic.
- 2.
This description separates damage mechanics from fracture or crack mechanics, respectively, which focuses on crack propagation rather than initiation.
- 3.
- 4.
Partial damage refers to a damage state \(0\le d\le \delta _0<1\), where \(\delta _0\) denotes the maximal damage possible. Partial damage models are more feasible for mathematical analysis, because they preserve uniform coercivity of the effective elasticity tensor, whereas complete damage leads to a degenerate momentum balance equation.
- 5.
This approach was also continued in some subsequent publications of the author, e.g. in the analysis of a contact problem in an otherwise equal setting in [8] or a dynamic frictional contact problem of a visco-elastic material with damage in [7]. Both these articles further developed the ideas presented in [10].
- 6.
For numeric investigations and results see [9].
- 7.
This is why, as a long-term project, we aim to identify g. The only assumptions on g stem from the regularity needed to perform the analysis (see [18]).
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The authors are indebted to Michael Böhm for initiating and supporting this research.
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Grützner, S., Muntean, A. (2018). Brief Introduction to Damage Mechanics and Its Relation to Deformations. In: van Meurs, P., Kimura, M., Notsu, H. (eds) Mathematical Analysis of Continuum Mechanics and Industrial Applications II. CoMFoS 2016. Mathematics for Industry, vol 30. Springer, Singapore. https://doi.org/10.1007/978-981-10-6283-4_10
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