Numerical simulations of tests on atypical specimens for estimation of fracture parameters of quasi brittle materials

Numerical simulations of tests on atypical specimens for estimation of fracture parameters of quasi brittle materials

Abstrakt

The work deals with a numerical analysis of fracture propagation in atypical test specimens (made of material with quasi-brittle manner) subjected to a novel test configuration. The aim is to select suitable test geometries and specimen shapes/sizes for future studies and real tests. The tests will be simulated in ATENA 2D software enabling modeling of cohesive crack propagation. The test specimens/geometries should represent wide line of different shapes: from compact specimens (like WST) to long ones (3PB) which should considerably differ in constraint conditions. The same type of loading will be used for the whole specimen/geometry set - a wedge mechanism causing splitting the test specimen (apart from compressing/bending of the specimen in the direction perpendicular to the splitting forces). The specimens shapes/test configurations selected for the real testing will be further numerically analyzed in detail in order to investigate the stress and displacement fields in the cracked bodies. So, a part of the present research is also focused on the over-deterministic analysis of the fields around the crack tip described via Williams power series.

The work deals with a numerical analysis of fracture propagation in atypical test specimens (made of material with quasi-brittle manner) subjected to a novel test configuration. The aim is to select suitable test geometries and specimen shapes/sizes for future studies and real tests. The tests will be simulated in ATENA 2D software enabling modeling of cohesive crack propagation. The test specimens/geometries should represent wide line of different shapes: from compact specimens (like WST) to long ones (3PB) which should considerably differ in constraint conditions. The same type of loading will be used for the whole specimen/geometry set - a wedge mechanism causing splitting the test specimen (apart from compressing/bending of the specimen in the direction perpendicular to the splitting forces). The specimens shapes/test configurations selected for the real testing will be further numerically analyzed in detail in order to investigate the stress and displacement fields in the cracked bodies. So, a part of the present research is also focused on the over-deterministic analysis of the fields around the crack tip described via Williams power series.

numerické simulace, atypická tělesa, lomové parametry, kvazikřehké materiály

numerické simulace, atypická tělesa, lomové parametry, kvazikřehké materiály

SOBEK, J.; VESELÝ, V.

2013

12.11.2012

Špičák, Česká republika

978-80-261-0157-4

Computational Mechanics 2012

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