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Study of Fracture Behavior of Cord-Rubber Composites for Lab Prediction of Structural Durability of Aircraft Tires II. Fatigue Damage Accumulation of Bias Carcass
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Abstract
Current phase of the study was undertaken to examine tensile fatigue behavior of cord-rubber composites representing bias tire carcass under various frequencies up to the level which closely simulates loading during high-speed take-off of aircraft. At a given stress amplitude, the use of higher cyclic frequency was found to affect strain response and heat build-up characteristics of composites significantly. The lower level of initial strain observed at higher frequency stems clearly from strain rate dependence of deformation of rubber matrix composites. The temperature profile of the specimens subjected from 20 to 30 Hz loading showed that hysteretic heating under these conditions may lead to thermal fatigue failure as well as chemical degradation influencing both fiber-matrix adhesion strength and matrix strength. The involvement of material degradation process was indicated by the fact that gross failure of composites requires lower value of dynamic creep when the frequency is increased. At the same time, the use of higher frequency resulted in exponentially higher dynamic creep rate. For load range tested, the energy loss per cycle was found to be nearly constant and independent of the frequency. As a result, the energy loss per unit time became linearly proportional to the frequency. Since fatigue life of carcass composites is linearly proportional to the inverse of frequency, it was postulated that the rate of energy loss determines the lifetime of composites. The study revealed that the specimen surface temperature may not describe such critical parameters as internal heating particularly at the point of crack initiation or true heat dissipation rate.
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Citation
Lee, B., Smith, J., Medzorian, J., Chawla, M. et al., "Study of Fracture Behavior of Cord-Rubber Composites for Lab Prediction of Structural Durability of Aircraft Tires II. Fatigue Damage Accumulation of Bias Carcass," SAE Technical Paper 922011, 1992, https://doi.org/10.4271/922011.Also In
References
- Lee B. L. Medzorian J. P. Fourspring P. M. Migut G. J. Champion M. H. Wagner P. M. Ulrich P. C. “Study of Fracture Behavior of Cord-Rubber composites for Lab Prediction of Aircraft Tire Durability” SAE Int'l , Aerospace Technology Conference, Paper # 901907 Long Beach, CA 1990
- Lee B. L. Medzorian J. P. Hippo P. K. Liu D. S. Ulrich P. C. “Fatigue Lifetime Prediction of Angle-Plied Fiber-Reinforced Elastomer Composites as Pneumatic Tire Materials” ASTM Committee E-9 , Second Symposium on Advances in Fatigue Lifetime Predictive Techniques Pittsburgh, PA 1992
- Liu D. S. Lee B. L. “Cumulative Fatigue Damage of Cord-Rubber Composites” The Tire Society , Eleventh Annual Meeting Akron, OH 1992
- Personal communications with the researchers in tire industry
- Bobo S. N. “Fatigue Life of Aircraft Tires” Tire Science and Technology 16 4 208 1988
- Clark S. K. “Loss of Adhesion of Cord-Rubber Composites in Aircraft Tires” Tire Science and Technology 14 1 33 1986
- Lou A. Y. C. Walter J. D. “Interlaminar Shear Strain Measurements in Cord-Rubber Composites” Experimental Mechanics 18 457 1978
- Walter J. D. “Cord-Reinforced Rubber” Mechanics of Pneumatic Tires Clark S. K. U.S. Department of Transportation Washington D.C. 1982
- Stalnaker D. O. Kennedy R. H. Ford J. L. “Interlaminar Shear Strain in a Two-Ply Balanced Cord-Rubber Composites” Experimental Mechanics 20 87 1980
- Ford J. L. Patel H. P. Turner J. L. “Interlaminar Shear Effects in Cord-Rubber Composites” Fiber Science and Technology 17 255 1982
- Rothert H. Nguyen B. Gall R. “Comparative Study on the Incorporation of Composite Material for Tyre Computation” Composite Structures Proc. of 2nd Int'l Conf. on Composite Structures Paisley College of Technology Scotland, UK 549 Applied Sci. Publ. 1983
- Cembrola R. J. Dudek T. J. “Cord/Rubber Material Properties” Rubber Chemistry and Technology 58 830 1985
- Interlaminar Response of Composite Materials Pagano N. J. Composite Materials Series 5 Elsevier Science Publ. Co. New York, NY 1989
- Breidenbach R. F. Lake G. J. “Mechanics of Fracture in Two-Ply Laminates” Rubber Chemistry and Technology 52 96 1979
- Breidenbach R. F. Lake G. J. “Application of Fracture Mechanics to Rubber Articles Including Tyres” Philosophical Trans. Royal Soc. London A299 189 1981
- Gehman S. D. “Rubber Structures and Properties” Mechanics of Pneumatic Tires Clark S. K. U.S. Department of Transportation Washington D.C. 1982
- Dodge R. N. Clark S. K. “Properties of Aircraft Tire Materials” SAE Int'l , Aerospace Technology Conference, Paper # 881358 Anaheim, CA 1988