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2014, 8(1): 2003-2020 Back to browse issues page
Assessment of fatigue behavior of Alvand monzogranite rocks
Gh Khanlari *1, AS Momeni, Murat Karakus
1- , khanlari_reza@yahoo.com
Abstract:   (6235 Views)
Comprehensive laboratory tests were performed to assess fatigue behavior of Alvand monzogranite rock subjected to uniaxial cyclic loading. A series of static loading tests was done to obtain the required data for the fatigue tests. Three maximum load levels (85, 90, 95% uniaxial compressive strength (&sigmac)) at amplitudes 70% were used with 1Hz cyclic loading frequency. The results indicated that maximum stress level significantly influenced fatigue behavior of this rock. It was found that fatigue life decreases in a power function with increasing maximum stress level. Accumulative fatigue damage process shows three stages of behavior including crack initiation phase, uniform velocity phase and acceleration phase. Fatigue damage process were analyzed according to axial and lateral maximum and minimum strain, tangent and second modulus, toughness and hysteresis energy in both loading and unloading conditions. Among these parameters, lateral strain, axial strain and second modulus show the best three-stage fatigue damage behavior. Also, it should be noted that most of the cracks generated in parallel to loading direction and lateral strain are affected by more than axial strain.  
Keywords: Cyclic loading, Load amplitude, Loading frequency, fatigue life, toughness
Full-Text [PDF 544 kb]   (1687 Downloads)    
Type of Study: Research Paper | Subject: En. Geology
Accepted: 2016/10/5 | Published: 2016/10/5
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Khanlari G, Momeni A, Karakus M. Assessment of fatigue behavior of Alvand monzogranite rocks. Journal of Engineering Geology. 2014; 8 (1) :2003-2020
URL: http://jeg.khu.ac.ir/article-1-417-en.html

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Volume 8, Issue 1 (7-2014) Back to browse issues page
نشریه زمین شناسی مهندسی Journal of Engineering Geology
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