Publication detail

Experimental - computational modelling of adhesion strength in composite materials

JANÍČEK, P., BURŠA, J.

Original Title

Experimental - computational modelling of adhesion strength in composite materials

English Title

Experimental - computational modelling of adhesion strength in composite materials

Type

conference paper

Language

en

Original Abstract

Standardized tests for adhesion testing evaluate e.g. the pull - out force that enables us to compare adhesion strength of various materials. The results of tests are valid for the same sample shapes and dimensions only; the tests, where one of the geometric parameters of the sample differs, cannot be compared in this way. The results of these tests cannot be transformed into an adhesion strength that should be used as a limit value in computational modelling and in evaluation of damage risk. This limited scope of application is conditioned by stress concentration in the sample. Therefore, computational modelling was used to find another type of test which does not show any stress concentration on the material interface or which finally gives a uniform stress distribution in the whole contact surface. The computational modelling was realized for steel fibre in rubber matrix, i.e. materials showing a mismatch in moduli of elasticity on five orders. The Mooney Rivlin material model was used for modelling the hyper-elastic behaviour of rubber. The most uniform stress distribution was found in some types of torsion tests. The results of these tests, realized experimentally with a different type of material combination, show a considerably low dependence of the adhesion strength, defined as the mean shear stress in the material interface before fracture, on the sample dimensions. The dependence of the adhesion strength on normal stress in the contact area was solved by means of computational experimental modelling.

English abstract

Standardized tests for adhesion testing evaluate e.g. the pull - out force that enables us to compare adhesion strength of various materials. The results of tests are valid for the same sample shapes and dimensions only; the tests, where one of the geometric parameters of the sample differs, cannot be compared in this way. The results of these tests cannot be transformed into an adhesion strength that should be used as a limit value in computational modelling and in evaluation of damage risk. This limited scope of application is conditioned by stress concentration in the sample. Therefore, computational modelling was used to find another type of test which does not show any stress concentration on the material interface or which finally gives a uniform stress distribution in the whole contact surface. The computational modelling was realized for steel fibre in rubber matrix, i.e. materials showing a mismatch in moduli of elasticity on five orders. The Mooney Rivlin material model was used for modelling the hyper-elastic behaviour of rubber. The most uniform stress distribution was found in some types of torsion tests. The results of these tests, realized experimentally with a different type of material combination, show a considerably low dependence of the adhesion strength, defined as the mean shear stress in the material interface before fracture, on the sample dimensions. The dependence of the adhesion strength on normal stress in the contact area was solved by means of computational experimental modelling.

RIV year

2002

Released

15.10.2002

Publisher

Witpress, southampton, boston

Location

Kihei, USA

ISBN

1-85312-926-7

Book

Seventh International Conference Damage and Fracture Mechanics VII

Pages from

403

Pages to

411

Pages count

9

Documents

BibTex


@inproceedings{BUT10670,
  author="Přemysl {Janíček} and Jiří {Burša}",
  title="Experimental - computational modelling of adhesion strength in composite materials",
  annote="Standardized tests for adhesion testing evaluate e.g. the pull - out force that enables us to compare adhesion strength of various materials. The results of tests are valid for the same sample shapes and dimensions only; the tests, where one of the geometric parameters of the sample differs, cannot be compared in this way. The results of these tests cannot be transformed into an adhesion strength that should be used as a limit value in computational modelling and in evaluation of damage risk. This limited scope of application is conditioned by stress concentration in the sample. Therefore, computational modelling was used to find another type of test which does not show any stress concentration on the material interface or which finally gives a uniform stress distribution in the whole contact surface. The computational modelling was realized for steel fibre in rubber matrix, i.e. materials showing a mismatch in moduli of elasticity on  five orders. The Mooney Rivlin material model was used for modelling the hyper-elastic behaviour of rubber. The most uniform stress distribution was found in some types of torsion tests. The results of these tests, realized experimentally with a different type of material combination, show a considerably low dependence of the adhesion strength, defined as the mean shear stress in the material interface before fracture, on the sample dimensions. The dependence of the adhesion strength on normal stress in the contact area was solved by means of computational experimental modelling.",
  address="Witpress, southampton, boston",
  booktitle="Seventh International Conference Damage and Fracture Mechanics VII",
  chapter="10670",
  institution="Witpress, southampton, boston",
  year="2002",
  month="october",
  pages="403",
  publisher="Witpress, southampton, boston",
  type="conference paper"
}