Computation of Composite Strengths by Limit Analysis

0506329 - ÚGN 2020 RIV CH eng J - Journal Article
Sysala, Stanislav - Blaheta, Radim - Kolcun, Alexej - Ščučka, Jiří - Souček, Kamil - Pan, P.
Computation of Composite Strengths by Limit Analysis.
Key Engineering Materials. Roč. 810, July 2019 (2019), s. 137-142. ISSN 1662-9795
R&D Projects: GA MŠMT LQ1602
Institutional support: RVO:68145535
Keywords : composite materials * compressive strength * failure * limit analysis * CT based FEM
OECD category: Applied mathematics
Method of publishing: Limited access
https://www.scientific.net/KEM.810.137

The paper is focused on computation of a compressive strength of composite materials by
limit analysis. This method enables to determine the strength or other types of limit loads by solution of
a specific optimization problem. It is also capable to predict failure zones. Abilities of the method are
investigated on a particular composite – a laboratory prepared sample consisting of a hard coal matrix
and a polyurethane binder. This sample is chosen due to available CT images of the inner structure and
laboratory experiments. Appropriate yield criteria are proposed for the coal and the binder in order to
define the limit analysis problem. This problem is penalized and then discretized by higher order finite
elements. For numerical solution, the semismooth Newton method and adaptive mesh refinements are
also used. Numerical experiments in 2D for various CT scans and material parameters are performed.
Permanent Link: http://hdl.handle.net/11104/0297604