Transverse crack formation in unidirectional composites by linking of fibre/matrix debond cracks

2018 ◽  
Vol 107 ◽  
pp. 294-303 ◽  
Author(s):  
Linqi Zhuang ◽  
Ramesh Talreja ◽  
Janis Varna
Keyword(s):  
Transverse Crack ◽  
Crack Formation ◽  
Unidirectional Composites ◽  
Fibre Matrix

Fibre-Matrix Interface Development during High Temperature Exposition of Long Fibre Reinforced SiOC Matrix

2013 ◽  
Vol 592-593 ◽  
pp. 401-404
Author(s):  
Zdeněk Chlup ◽  
Martin Černý ◽  
Adam Strachota ◽  
Martina Halasova ◽  
Ivo Dlouhý
Keyword(s):  
High Temperature ◽  
Crack Formation ◽  
Fracture Behaviour ◽  
Point Of View ◽  
Reinforced Composites ◽  
Matrix Interface ◽  
Significant Damage ◽  
The Matrix ◽  
Fibre Matrix ◽  
Fibre Reinforced Composites

The fracture behaviour of long fibre reinforced composites is predetermined mainly by properties of fibre-matrix interface. The matrix prepared by pyrolysis of polysiloxane resin possesses ability to resist high temperatures without significant damage under oxidising atmosphere. The application is therefore limited by fibres and possible changes in the fibre matrix interface. The study of development of interface during high temperature exposition is the main aim of this contribution. Application of various techniques as FIB, GIS, TEM, XRD allowed to monitor microstructural changes in the interface of selected places without additional damage caused by preparation. Additionally, it was possible to obtain information about damage, the crack formation, caused by the heat treatment from the fracture mechanics point of view.

Simulation of transverse crack formation on continuously cast peritectic medium carbon steel slabs

1999 ◽  
Vol 70 (10) ◽  
pp. 412-419 ◽  
Author(s):  
Mikio Suzuki ◽  
Hiroshi Hayashi ◽  
Hiroyuki Shibata ◽  
Toshihiko Emi ◽  
In-Jae Lee
Keyword(s):  
Carbon Steel ◽  
Transverse Crack ◽  
Crack Formation ◽  
Medium Carbon Steel ◽  
Medium Carbon ◽  
Continuously Cast ◽  
Steel Slabs

Numerical Study of the Progression of the Micromechanical Debonding Damage in Composites

2018 ◽  
Vol 774 ◽  
pp. 644-649
Author(s):  
M.L. Velasco ◽  
Federico París ◽  
E. Correa
Keyword(s):  
Scale Effect ◽  
Release Rate ◽  
Transverse Crack ◽  
Numerical Study ◽  
Multiscale Model ◽  
Second Phase ◽  
Matrix Interface ◽  
Kinked Crack ◽  
The Matrix ◽  
Fibre Matrix

This paper deals with the study of the actual progression of the damage in the 90 degrees lamina of a composite. It has been proved and observed that isolated debondings between fibres and matrix are the first manifestation of damage in the weakest lamina, the 90 degrees lamina in a [0,90]S laminate. It was also numerically supported that this first phase was independent of the thickness of the 90 degrees lamina, not being then affected by the “scale effect”. The continuation of this first phase of damage is the objective of the present paper. To this end, a multiscale model is created involving the debonding between fibre and matrix and studying the kink of this crack, abandoning the fibre-matrix interface and entering into the matrix to produce a meso-transverse crack in the 90 degrees ply. The study is based on the application of Fracture Mechanics to an incipient kinked crack that starts from a debonding between fibre and matrix. It is concluded that this second phase of damage, playing with the thickness of the 90 degrees lamina, is not affected by the scale effect, as the variation of the energy release rate of the kinked crack is not significantly influenced by the variation of the thickness of the lamina.

On the mechanism of tensile fracture in notched fibre reinforced plastics

1978 ◽  
Vol 361 (1706) ◽  
pp. 325-341 ◽  
Keyword(s):  
Fracture Stress ◽  
Transverse Crack ◽  
Fracture Criterion ◽  
Experimental Results ◽  
Tensile Fracture ◽  
Structural Factors ◽  
Matrix Interface ◽  
Reinforced Plastics ◽  
Fibre Matrix ◽  
Fracture Processes

By observation of the tensile fracture processes occurring in continuous fibre reinforced plastics, the micro-structural factors which govern the unstable propagation of a transverse crack have been identified. A tensile fracture criterion is thereby developed in which the notch sensitivity is related to the properties of the fibre, matrix and fibre/ matrix interface. The fracture criterion is applied to elliptically notched laminates, whence predictions of the effect of notch size on tensile fracture stress are compared with experimental results for circular notches of various diameters.

Study of Transverse Crack Formation of a Nb-Peritectic Steel

2012 ◽  
Vol 706-709 ◽  
pp. 1466-1473
Author(s):  
S. Nafisi ◽  
L. Collins ◽  
E.S. Szekeres
Keyword(s):  
Transverse Crack ◽  
Crack Formation ◽  
Cast Steel ◽  
Infrared Camera ◽  
Temperature History ◽  
Hot Ductility ◽  
Peritectic Steel ◽  
Ductility Trough ◽  
Continuously Cast ◽  
Crack Susceptibility

The problem of transverse crack formation in continuously cast steel has been an issue for over 30 years. The crack susceptibility depends not only to the steel composition, but also to the temperature history during casting. To improve the surface quality, two key solutions have been suggested; adjusting the straightening stage to an appropriate temperature range, out of hot ductility trough, and/or alloy modification. These solutions have certain limitations and difficulties still exist for grades such as peritectic steels containing Nb or V. In this article, the hot ductility of a peritectic steel grade with Nb has been studied under direct cast conditions. This was performed using a Gleeble 3800 thermo-mechanical simulator under two critical strain rates. In addition, the transverse crack formation and appearance, as well as the application of infrared camera to study the surface temperature profile of the slabs is presented.

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