Mechanical response of unidirectional composite bars loaded in transverse compression

Tanks, Jonathon; Harris, Devin K.; Sharp, Stephen R

doi:10.1016/j.compositesb.2016.04.051

Cited by 18 publications

(11 citation statements)

References 25 publications

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“…These microcracks may result in invasion of the matrix by the surrounding mediums (alkaline and water) which in turn may reach and attack the fibers. 3,27 In this study, the CFCC specimens were subjected to a sustained load equivalent to 40% and 65% of their guaranteed capacity specified by the manufacturer for 3000, 5000 and 7000 h. The effect of sustained load was studied by comparing the as-received specimens to the specimens subjected to sustained load only for the specified durations (at the same alkaline solution and elevated temperature). The effect of the stress levels on the tensile strength retention of the CFCC strands is comparatively presented in Tables 2 and 3 and Figure 10.…”

Section: Test Results and Analysismentioning

confidence: 99%

Effect of applied sustained load and severe environments on durability performance of carbon-fiber composite cables

Ali

Mohamed

Benmokrane

et al. 2018

Journal of Composite Materials

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The research work reported in this paper involves investigation of the mechanical and durability performance of unstressed and stressed Tokyo Rope carbon-fiber composite cables for prestressing applications. This research is critical in order to establish the critical (allowable) stress and safety factors for the use of carbon-fiber composite cable tendons for prestressed precast-concrete members. The carbon-fiber composite cable specimens were exposed to simultaneous high alkali environment and sustained loading at different elevated exposure temperatures (22℃ and 60℃) for 3000, 5000, and 7000 h. The high alkali environment (12.8 pH) simulated the concrete pore solution and the elevated temperature was used to accelerate the aging process. The applied sustained stress on the carbon-fiber composite cable strands was equivalent to 40% and 65% of their guaranteed tensile strength. This was achieved through testing 171 carbon-fiber composite cable specimens subjected to stress levels of 0%, 40%, and 65% of their guaranteed strength, under tensile load. Also, 136 carbon-fiber composite cable specimens were tested to investigate the transverse shear strength. In addition, the durability characteristics of the constituent materials of the carbon-fiber composite cable strands were assessed to understand the long-term behavior of these materials. The results showed the effect of sustained stress on the degradation of carbon-fiber composite cable strands. Under sustained stress of 40% and 65%, the reductions in tensile strength were 10.6% and 12.3%, respectively. Scanning electron microscope results on epoxy resin indicated that no degradation is detected since the surface remains smooth without any pitting or loose material.

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Section: Test Results and Analysismentioning

confidence: 99%

Effect of applied sustained load and severe environments on durability performance of carbon-fiber composite cables

Ali

Mohamed

Benmokrane

et al. 2018

Journal of Composite Materials

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“…Substitution of the strain-displacement relations (equation (3)) into the constitutive equation (equation (2)) and then substitution of the results into the equilibrium equation (equation 1) yields a nonhomogeneous second-order ordinary linear differential equation [25,28,57]. Equations (4) and (5) are the general solutions for radial displacement fields of both domains (see equations (31) to (35) in Appendix 1 for details) (5) Note that in the inner filler region, w ðiÞ r ¼0 ¼ 0 j…”

Section: Derivation Of Exact Analytical Solutions For Displacement Fimentioning

confidence: 99%

“…There have been many studies to analytically, numerically, and experimentally investigate the effective properties of traditional composites, nanocomposites, and their constructing unit cells [21–39]. As a result, various micromechanical models are available to predict the macroscopic behaviors of traditional fiber-reinforced composites [e.g., 21–26,37], some of which assume that both fiber and matrix have isotropic or transversely isotropic properties [26].…”

Section: Introductionmentioning

confidence: 99%

Generally cylindrical orthotropic constitutive modeling of matrix-filled carbon nanotubes: Transverse mechanical properties and responses

Askari

Ghasemi‐Nejhad

2018

Jnl of Sandwich Structures & Materials

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The main objective of this article is to introduce exact analytical closed-form solutions for the prediction of effective transverse Young’s modulus and Poisson ratio of a matrix-filled nanotube (i.e., a representative element of nanotube-based nanocomposites), as well as its mechanical behavior, when subjected to external loads. In this work, both the nanotube and its filler were considered to be generally cylindrical orthotropic. To ensure no loss of generality, the no plane strain condition was used, and the axial strain was taken into consideration to obtain a more precise set of solutions. Analytical formulae were developed based on the well-established principles of linear elasticity and continuum mechanics, considering effective orthotropic properties for both constituents as continuum tubes. To validate and verify the accuracy of the closed-form solutions obtained from the analytical approach, a three-dimensional finite element analysis was performed, and results were compared to those obtained from the analytical exact solutions. Excellent agreement was achieved, and the analytically obtained solutions were verified.

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“…In 2009, Ye et al [13] proposed a theory perfect test method to estimate the tensile elastic modulus of rock materials adopting Brazilian disc test. is test method has attracted much attention not only from the field of rock engineering [14,15], but also from the field of material science, such as composite materials [16][17][18] and ceramics [19]. After that, Ye et al [20] further improved the method to measure the tensile and compressive elastic modulus of rock materials synchronously by adopting the digital image correction (DIC) technique.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Test Method for Tensile Elastic Modulus of Rock Materials

Zhang

2019

Advances in Civil Engineering

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Rock material has different mechanical behaviors under compressive and tensile loading. Correspondingly, there are two types of elastic modulus: compressive elastic modulus Ec and tensile elastic modulus Et, respectively. To distinguish which indirect test methodology, including three-points bending test and Brazilian disc test, is more suitable to measure the tensile elastic modulus Et of rock materials, a series of uniaxial compressive test (UCT), direct tensile test (DTT), three-points bending test, and Brazilian disc test are performed for three typical types of rock: marble, granite, and sandstone. Comparative investigation on the reliability of measurement results of tensile elastic modulus Et is systematically conducted. Finally, it is found that Brazilian disc test could be a suitable method to measure tensile elastic modulus of rock materials, due to the excellent agreement with that measured by DTT and the simplicity of sample preparation, as well as test operation.

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Mechanical response of unidirectional composite bars loaded in transverse compression

Cited by 18 publications

References 25 publications

Effect of applied sustained load and severe environments on durability performance of carbon-fiber composite cables

Effect of applied sustained load and severe environments on durability performance of carbon-fiber composite cables

Generally cylindrical orthotropic constitutive modeling of matrix-filled carbon nanotubes: Transverse mechanical properties and responses

Comparative Study on the Test Method for Tensile Elastic Modulus of Rock Materials

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