Analysis Fracture Behaviour of Asphalt Mixtures in Freezing and Thawing Cycles Conditions Using Linear Elastic Fracture Mechanic (LEFM) Technic
DOI:
https://doi.org/10.24200/jrset.vol4iss04pp22-30Abstract
Considering the military implementation prohibitions and highly developed technologies of composite materials , this project studies about increasing the power of martial and fire in Gyroplanes and light Helicopters by design, optimization and manufacturing of composite launchers instead of isotropic types. Using composite type launchers have advantage of lower weight, higher life and simplicity in manufacturing. Modeling and analysis accomplished by Abaqus Software and the fiber composite directions improved by coding in Matlab Software. The optimization process completed by linking both softwares. Till now, more than 800 successful shots have been made in several centers using composite launchers. Because of easy manufacturing of this kind of launchers, there is no need to have advanced equipments and all the works have been provided by semi-skilled workers in the simple workshops.References
Qajar, R., “Fracture and Fatigue Mechanics” K.N.Toosi University of Technology. 2009.
A. A. Griffith, "The Phenomena of Rapture and Flow in Solids," Philosophical Transactions, 1920, vol. 221, pp. 163-198.
F. McClintock, "Discussion:" On the Crack Extension in Plates Under Plane Loading and Transverse Shear "(Erdogan, F., and Sih, GC, 1963, ASME J. Basic Eng., 85, pp. 519- 525), "Journal of Basic Engineering, 1963, vol. 85, pp. 525-527.
AAshto, "AAshto," American Association of State Highway and Transportation 2004.
R. C. G. Hass, and Phang, W. A., "Relationships between mix characteristics and low-temperature pavement cracking," AAPT, 1988, vol. 57, pp. 290-319.
M. K, "application of fracture mechanics for improved design of bituminous concrete" FHWA, 1976, vol. 1.
M. Aliha, H. Fazaeli, S. Aghajani, and F. M. Nejad, "Effect of temperature and air void on mixed mode fracture toughness of modified asphalt mixtures," Construction and Building Materials, 2015, vol. 95, pp. 545-555.
M. Aliha, H. Behbahani, H. Fazaeli, and M. Rezaifar, "Study of characteristic specification on mixed mode fracture toughness of asphalt mixtures," Construction and Building Materials , 2014, vol. 54, pp. 623-635.
X.-J. Li and M. Marasteanu, "Using semicircular bending test to evaluate low temperature fracture resistance for asphalt concrete," experiment of mechanics, 2010, vol. 50, pp. 867-876.
M. R. AYATOLLAHI and S. PIRMOHAMMAD, "Experimental Determination of Mode II Fracture Resistance in Asphalt Concretes," ISEM, 2012
M.A., Allahi, "the crack growth in concrete under combined loads tensile - shear (low-temperature)," Department of Transportation, Department of Transportation in 2012.
