scholarly journals The role of microcracking on the crack growth resistance of brittle solids and composites

1994 ◽  
Author(s):  
S.B. Biner
2018 ◽  
Vol 85 (11) ◽  
Author(s):  
Emilio Martínez-Pañeda ◽  
Norman A. Fleck

The sensitivity of crack growth resistance to the choice of isotropic or kinematic hardening is investigated. Monotonic mode I crack advance under small scale yielding conditions is modeled via a cohesive zone formulation endowed with a traction–separation law. R-curves are computed for materials that exhibit linear or power law hardening. Kinematic hardening leads to an enhanced crack growth resistance relative to isotropic hardening. Moreover, kinematic hardening requires greater crack extension to achieve the steady-state. These differences are traced to the nonproportional loading of material elements near the crack tip as the crack advances. The sensitivity of the R-curve to the cohesive zone properties and to the level of material strain hardening is explored for both isotropic and kinematic hardening.


2016 ◽  
Vol 84 ◽  
pp. 28-39 ◽  
Author(s):  
Sertan Alkan ◽  
Piyas Chowdhury ◽  
Huseyin Sehitoglu ◽  
Richard G. Rateick ◽  
Hans J. Maier

2019 ◽  
Vol 126 ◽  
pp. 136-150 ◽  
Author(s):  
Emilio Martínez-Pañeda ◽  
Vikram S. Deshpande ◽  
Christian F. Niordson ◽  
Norman A. Fleck

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2746
Author(s):  
Mingjin Liu ◽  
Jiaxu Luo ◽  
Jin Chen ◽  
Xueqin Gao ◽  
Qiang Fu ◽  
...  

With the development of polymer science, more attention is being paid to the longevity of polymer products. Slow crack growth (SCG), one of the most important factors that reveal the service life of the products, has been investigated widely in the past decades. Here, we manufactured an isotactic polypropylene (iPP) sample with a novel shear layer–spherulites layer alternated structure using multiflow vibration injection molding (MFVIM). However, the effect of the alternated structure on the SCG behavior has never been reported before. Surprisingly, the results showed that the resistivity of polymer to SCG can be enhanced remarkably due to the special alternated structure. Moreover, this sample shows unique slow crack propagation behavior in contrast to the sample with the same thickness of shear layer, presenting multiple microcracks in the spherulites layer, which can explain the reason of the resistivity improvement of polymer to SCG.


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