On the Reason that Passenger Tire Sidewalls are Based on Blends of Natural Rubber and cis-Polybutadiene

2000 ◽  
Vol 73 (4) ◽  
pp. 743-752 ◽  
Author(s):  
H. J. Kim ◽  
G. R. Hamed
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Natural Rubber ◽  
Crack Growth ◽  
Slow Crack Growth ◽  
Longitudinal Crack ◽  
Crack Branching ◽  
Butadiene Rubber ◽  
Good Resistance

Abstract A tire sidewall must have good resistance to fracture over a range of conditions covering rapid as well as slow crack growth. A vulcanizate based on a 50/50 natural rubber (NR)/cis-butadiene rubber (cis-BR) blend seems to meet this requirement. It retains the ability for longitudinal crack branching and has catastrophic rupture resistance near that of a corresponding NR vulcanizate. At the same time, the blend has good resistance to slow fatigue crack growth, much like that of a cis-BR vulcanizate. The combination of desired properties in the blend may result from co-continuity of its NR and BR phases.

COMPARISON OF SINE VERSUS PULSE WAVEFORM EFFECTS ON FATIGUE CRACK GROWTH BEHAVIOR OF NR, SBR, AND BR COMPOUNDS

2010 ◽  
Vol 83 (4) ◽  
pp. 391-403 ◽  
Author(s):  
G. Andreini ◽  
P. Straffi ◽  
S. Cotugno ◽  
G. Gallone ◽  
G. Polacco
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Natural Rubber ◽  
Crack Growth ◽  
Fine Tuning ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Pulse Waveform ◽  
Tearing Energy ◽  
Styrene Butadiene

Abstract Fatigue crack growth experiments on carbon black-filled rubber compounds have been carried out to evaluate the influence of testing conditions over different compound formulations. Investigations on the influence of waveform, data acquisition, and compound formulation have been performed on strip-tensile specimens reproducing the mode I of crack opening. The response of three different compound formulations (based on either natural rubber, butadiene rubber, or styrene-butadiene rubber) to the application of two different waveforms, pulse and sine, has been analyzed, showing significant differences in fatigue behavior and ranking of the various compounds. Compared to the sinusoidal waveform, the use of a pulse waveform provided an improved correlation of the tearing energy with the crack propagation speed. This difference was particularly evident in the case of natural rubber and butadiene rubber, while it resulted negligible in the case of styrene-butadiene rubber. Such a different behavior could be attributed to differences in macromolecular chains orientation. Fine-tuning of video acquisition parameters provided an accurate observation of the crack growth process, as confirmed by the low standard deviation of the estimated tearing energy and crack growth rate.

Estimation of fatigue crack growth retardation due to crack branching

2004 ◽  
Vol 29 (4) ◽  
pp. 446-452 ◽  
Author(s):  
D.G. Pavlou ◽  
N.V. Vlachakis ◽  
M.G. Pavlou ◽  
V.N. Vlachakis
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Growth Retardation ◽  
Crack Branching ◽  
Crack Growth Retardation

Fatigue crack growth dynamics in filled natural rubber

2012 ◽  
Vol 41 (7) ◽  
pp. 273-276 ◽  
Author(s):  
L. Munoz ◽  
L. Vanel ◽  
O. Sanseau ◽  
P. Sotta ◽  
D. Long ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Natural Rubber ◽  
Crack Growth ◽  
Growth Dynamics

scholarly journals Fatigue crack growth in natural rubber: The role of SIC investigated through post-mortem analysis of fatigue striations

2018 ◽  
Vol 201 ◽  
pp. 353-365 ◽  
Author(s):  
B. Ruellan ◽  
J.-B. Le Cam ◽  
E. Robin ◽  
I. Jeanneau ◽  
F. Canévet ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Natural Rubber ◽  
Crack Growth ◽  
Post Mortem ◽  
Fatigue Striations

Fatigue crack growth dynamics in filled natural rubber

2011 ◽  
pp. 343-346
Author(s):  
L Vanel ◽  
L Munoz ◽  
O Sanseau ◽  
P Sotta ◽  
D Long ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Natural Rubber ◽  
Crack Growth ◽  
Growth Dynamics
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