Abstract
The performance of pretensioned, laminated, unidirectional (UD), carbon fiber reinforced polymer (CFRP) straps, that can potentially be used for example as bridge deck suspender cables or prestressed shear reinforcements for reinforced concrete slabs and beams, was investigated at elevated temperatures. This paper aims to elucidate the effects of elevated temperature specifically on the tensile performance of pretensioned, pin-loaded straps. Two types of tests are presented: (1) steady state thermal and (2) transient state thermal. Eight steady-state target temperatures in the range of 24 °C to 600 °C were chosen, based on results from dynamic mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA). Transient state thermal tests were performed at three sustained tensile load levels, namely 10, 15, and 20 kN, corresponding to 25%, 37%, and 50% of the ultimate tensile strength of the pin-loaded straps at ambient temperature. In general, the straps were able to retain about 50% of their ambient temperature ultimate tensile strength (UTS) at 365 °C.
Highlights
Carbon fiber reinforced polymers (CFRPs) have been extensively used in aerospace, automotive, and structural engineering applications for more than 50 years [1]
The tensile performance of pretensioned, laminated, titanium pin-loaded CFRP straps exposed to elevated temperatures up to 600 ◦ C was investigated and presented
A pretensioning mold able to preload the straps with 10% of their average ultimate failure load at ambient temperature was developed
Summary
Carbon fiber reinforced polymers (CFRPs) have been extensively used in aerospace, automotive, and structural engineering applications for more than 50 years [1]. The high strength-to-weight ratios and tensile rigidity facilitate their use as both reinforcing materials and in stand-alone applications [2,3,4]. Previous researchers have extensively documented the tensile behavior of unidirectional (UD) CFRP. The basic damage mechanisms of UD CFRP laminate plates under tensile loading have been documented by Talreja and Singh [5]; these include fiber breakages/splitting, fiber/matrix debonding, and microcracking in a plane transverse to the fiber direction. In terms of the tensile strength of unidirectional elements, it is generally assumed that fiber breakage is the dominant initiating failure mechanism. Under quasi-static tensile loading, the failure process may be a complex progression of ply cracking, delamination (initiated due to radial stresses caused by bending) and sudden fiber breakage [7,8]
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