Tensile Properties of CFRP and Hybrid FRP Composites at Elevated Temperatures

Abstract

The performance of fiber reinforced polymer (FRP) composites at high temperatures is a serious concern that needs investigation before the incorporation of these composites into important engineering structures. This article presents an experimental study on the tensile properties of carbon fiber reinforced polymer (CFRP) sheets, hybrid carbon/glass fiber reinforced polymer (C/GFRP) sheets and hybrid carbon/basalt fiber reinforced polymer (C/BFRP) sheets at different temperatures. The specimens of FRP sheets were tested at temperatures ranging from 16 to 200°C, while corresponding dry fiber sheets (without resin impregnation) were tested at 16°C as a reference. The test results show that the tensile strength of carbon fibers in different FRP sheets decreases significantly with increasing temperature, and remains almost stable at an ultimate value (3000 MPa) after the polymer exceeds its glass transition temperature (T g), which is higher than the tensile strength of the non-impregnated fiber sheets at room temperature. At elevated temperatures, the hybridization of fibers can reduce the scatter of the tensile strengths of CFRP composites. Additionally, the tensile strength of CFRP sheets with different dimensions is significantly different, but size dependence is independent of temperature. Furthermore, elevated temperature also influences the failure modes of FRP composites.

Performance of Concrete Confined with a Jute–Polyester Hybrid Fiber Reinforced Polymer Composite: A Novel Strengthening Technique

“…Many experimental studies reported that external wrapping by FRP composite could remarkably increase the load-carrying ability of circular, square, and rectangular concrete columns [5][6][7]. Different types of FRPs have been used for the lateral confinement of concrete columns, which includes carbon [8][9][10][11][12][13][14], glass [7,[15][16][17][18], aramid [6,[19][20][21], polyethylene napthalate (PEN) [22,23], polyethylene terephthalate (PET) [22][23][24][25][26], and basalt [27][28][29]. These FRP composites are effectively used in enhancing the load-bearing capacity and energy absorption of masonry and reinforced concrete infrastructures.…”

Fire behaviour of FRP-strengthened reinforced concrete structural elements: A state-of-the-art review

“…Since then, a number of additional relevant studies performed on tensile properties of FRPs specifically used for civil engineering strengthening applications have been presented, including the work of Cao et al [12], Wang et al [13], Chowdhury et al [14], and Yu and Kodur [15]. Two basic types of test procedures (similar to those typically used at ambient temperature 1 ) were used in these prior studies: specimens were (i) heated up to a predefined temperature and then loaded up to failure (steady state (S) conditions); or (ii) loaded to a fraction of their ambient temperature strength and then heated up to failure (transient state (T) conditions).…”

“…Cao et al [12] performed a series of tensile tests on CFRP and hybrid (carbon/glass fibre) FRP sheets from ambient temperature up to 200 C under steady state (S) conditions. Fig.…”

A strain rate and temperature dependent criterion to describe the linear - non linear behaviour’s transition of organic matrix composite materials in shear: Application to T700GC/M21

“…The mechanical behaviour of CFRP is known to be strain rate dependent [2][3][4][5], especially with shear loading [4,6,7] and temperature dependent [2,3,8]. One important conclusion of these studies is that their mechanical shear behaviour can be decomposed into two different phasis: a first linear, a second non linear, followed by the final rupture of the material [4,6,9,10].…”