A framework for identifying better cubature rules for plane and solid elements

Research output: Contribution to conferenceAbstractpeer-review

Abstract / Description of output

As simulation requirements on the performance of computational methodologies increase, higher-order interpolations, and therefore higher-order integration schemes, can be advantageous. In the past few decades, a lot of new Gaussian type cubature rules have been found [1], but their performance inside practical Finite Element simulation is hardly explored. It is therefore meaningful to identify the new rules that have better performance than the classic integration schemes, especially the rules that behave well in the simulations which have problems like locking and spurious zero energy mode. However, in the past, only few works [2, 3] have concentrated on the tests of numerical integration schemes and none of them have developed a systematic way to individually examine numerical integration schemes.

Our purpose is to identify new cubature rules with better performance through a novel framework which, for the first time, systematically examines the performance of cubature rules in plane and solid elements. Before tests, target rules are carefully selected and classified according to its number and distribution of integration points. The framework has four steps: eigenvalue analysis, patch test, beam/plate/shell tests and stability/accuracy analysis. The third step involves only representative tests that reflects the effect of integration schemes and thus requires fewer tests than a general framework designed for elements. Besides, Displacement Stability Plot and Pathological Tests Score are employed as qualitative and quantitive comparison methods. Based on this new framework, comparing the new rules with the classic full/reduced/selective reduced integration rules, cubature rules with better performance could be identified.

REFERENCES
[1] Cools, R. (1997). Constructing cubature formulae: the science behind the art. Acta Numerica, 6, pp.1–54.
[2] Rao, K.M. and Shrinivasa, U. (2001). A set of pathological tests to validate new finite elements. Sadhana, 26(6), pp.549–590.
[3] Sauer, G. (1999). Alternative reduced integration avoiding spurious modes for 8-node quadrilateral and 20-node hexahedron finite elements. Forschung im Ingenieurwesen, 65(5-6), pp.131–135
Original languageEnglish
Publication statusPublished - Jun 2022
Event8th European Congress on Computational Methods in Applied Sciences and Engineering - Oslo, Norway
Duration: 5 Jun 20229 Jun 2022

Conference

Conference8th European Congress on Computational Methods in Applied Sciences and Engineering
Abbreviated titleECCOMAS Congress 2022
Country/TerritoryNorway
CityOslo
Period5/06/229/06/22

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