Search

Start Over Coverage 155-163

2. The effect of critical distance on stability conditions for a crack at the interface between two polymer materials

Creator:
Zouhar, Michal, Náhlík, Luboš, Hutař, Pavel, Ševčík, Martin, and Knésl, Zdeněk
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
stability criterion, critical distance, bi-material interface, and generalized stress intensity factor
Language:
English
Description:
The aim of this work is to study the behaviour of a crack with its tip at the interface between two polymer materials. A numerical model of a cracked bi-material tension specimen is investigated and different stability criteria are tested. The stability criterion of a general stress concentrator usually needs a relation between the critical value of the generalized stress intensity factor (HIC) and critical value of the stress intensity factor KIC (fracture toughness). This relation is a function of the elastic mismatch of particular mterials; the fracture toughness of the main material and the critical distance d ahead of the stress concentrator, where the criterion is applied. Estimation of distance d is usually not straightforward and different authors use different approaches for its determination. Therefore the main aim of this study is the mutual comparison of published approaches for d estimaton and to quantify the influence of d choice on the critical load value. The results obtained can lead to a better residual lifetime prediction and safer design of layered structures. and Obsahuje seznam literatury
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public