Naslov
On characterising fracture resistance in mode-I delamination
(O karakterizaciji lomne otpornosti kod delaminacije u modu I)

Autori
Škec, Leo ; Jelenić, Gordan ; Alfano, Giulio

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Skup
9th International Conference of the Croatian Society of Mechanics

Mjesto i datum
Split, Hrvatska, 18.09.2018. - 22.09.2018

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Recenziran

Ključne riječi
linear elastic fracture mechanics ; cohesive zone models ; mode I delamination, double cantilever beam, equivalent crack length

Sažetak
In this work we focus on the mode-I quasi- static crack propagation in adhesive joints or composite laminates. For this problems a number of different standards have been approved. The most widely used are based on the double cantilever beam (DCB) test and on linear elastic fracture mechanics (LEFM) but differ in some aspects of the testing procedure and the recommended data-reduction schemes. The applicability of these methods is still a matter of debate in the scientific community, particularly in the case of ductile interfaces. We revisit the accuracy of the most used standards and compare it with other methods based on either LEFM or J- integral theory. All the methods analysed in our work are based on either Euler- Bernoulli or Timoshenko beam theories. We present a number of numerical examples where we compare different expressions for fracture resistance obtained with different methods. The input for the analysis, which includes applied load, cross-head displacement and rotation, crack length and cohesive zone length, is obtained from the numerical model which simulates real experiments. In these simulations, we use a Timoshenko beam model with a bi-linear CZM, which allows us accurate comparison with analytical formulas for fracture resistance based on Euler-Bernoulli and Timoshenko beam theory.

Izvorni jezik
Engleski

Znanstvena područja
Temeljne tehničke znanosti

POVEZANOST RADA