Effects of stress ratio on fatigue life of carbon-carbon composites

Mahfuz, Hassan; Maniruzzaman, Md.; Krishnagopalan, J.; Haque, A.; Ismail, Muammar Ibrahim; Jeelani, Shaik

doi:10.1016/0167-8442(95)00028-d

Cited by 23 publications

(10 citation statements)

References 3 publications

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“…It can be noted from the figure that beam F-5 exhibited higher deflection at any given number of cycles, which may be attributed to the lower concrete strength of beam F-5. Findings and conclusions of the effect of load range and maximum load are in general similar to those reported in the literature for the material level studies (Do et al 1993, Harmon et al 1998, Mahfuz et al 1995 and member level studies (Barnes andMays 1999, Shahawy andBeitleman 1999) studies of unconfined and confined concrete, FRP coupons and RC beams.…”

Section: Test Observations and Failure Modessupporting

confidence: 81%

Fatigue Behavior of Concrete-Filled Fiber-Reinforced Polymer Tubes

2008

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AHMAD, IFTEKHAR. Shear Response and Bending Fatigue Behavior of Concrete-Filled Fiber Reinforced Polymer Tubes. (Under the direction of Amir Mirmiran.) Recent field applications and research findings have demonstrated the effectiveness of concrete-filled fiber reinforced polymer (FRP) tubes (CFFT) as an efficient and promising hybrid system for designing main components such as pier columns, girders and piles for a bridge system. The vision was to provide a cost-competitive unified system composed of FRP/concrete hybrid members, which may act as a viable alternative to conventional reinforced and prestressed concrete structural systems. To achieve their broad-based implementation in civil infrastructure, understanding of their behavior and developing analytical tools under full spectrum of primary and secondary load demands are essential. Response characterizations under primary load demands namely, axial compression, flexural and axial-flexural, and seismic loadings have already been reported. However, investigations under primary shear and secondary fatigue load demands remain to be addressed. The present study consists of two phases. In the first phase, an experimental and analytical investigation was undertaken to characterize the behavior of a CFFT beam. Study on shear was primarily focused on the deep beam behavior. Comparisons of behavior of deep, short and slender beams were also highlighted. A strut-and-tie model approach, pertinent to analysis of deep reinforced and prestressed concrete members, was proposed to predict the shear strength of deep CFFT beams. Prediction showed good agreement with test results. It was concluded that shear failure mode is only critical for beams with shear span less than their depth.

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Section: Test Observations and Failure Modessupporting

confidence: 81%

Fatigue Behavior of Concrete-Filled Fiber-Reinforced Polymer Tubes

2008

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“…Since this continued up to 50% load level, we were able to find an intersection point at around the 60% marker which was defined as a threshold load level. Below this threshold stress level, we believe the fatigue failure mechanisms such as matrix cracks, filament splitting, and delamination [29][30][31] are significantly slowed down with 1.5% system. And that is quite possible, since nanoinfusion (1.5%) certainly improves the matrix properties and matrix dominated failure modes as we have seen earlier.…”

Section: Fatigue Testsmentioning

confidence: 92%

Fabrication and mechanical characterization of carbon/SiC-epoxy nanocomposites

Chisholm

Mahfuz

Rangari

et al. 2005

Composite Structures

289

126

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“…In this method, the approximated fatigue limit w' is obtained by using only one specimen. As shown in figure 3, the stress amplitude was increased by 2 MPa after every application of 2x10 4 cycles. We can approximate the fatigue limit by the stress amplitude of one stage before the specimen breaks within 10 4 cycles of stress application.…”

Section: Introductionmentioning

confidence: 83%