Strain rate dependence of HPFRCC cylinders in monotonic tension |
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Authors: | K S Douglas and S L Billington |
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Affiliation: | (1) CalStar Products, Inc., Newark, CA, USA;(2) Stanford University, Stanford, CA, USA; |
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Abstract: | High-Performance Fiber-Reinforced Cementitious Composite (HPFRCC) materials exhibit strain hardening in uniaxial, monotonic
tension accompanied by multiple cracking. The durability of HPFRCC materials under repeated loading makes them potentially
suitable for seismic design applications. In this paper, the strain rate dependence of tensile properties of two HPFRCC materials
in cylindrical specimens is reported from a larger study on strain rate effects in tension, compression and cyclic tension–compression
loading. The cylindrical specimens were loaded in monotonic tension at strain rates ranging from quasi-static to 0.2 s−1. To evaluate the impact of specimen geometry on tensile response, coupon specimens loaded in monotonic tension under a quasi-static
strain rate were compared to corresponding cylindrical specimens made from the same batch of material. Tensile strength and
ductility of the HPFRCC materials were significantly reduced with increasing strain rate. Multiple cracking, strain hardening,
strain capacity, and the shape of the stress–strain response were found to be dependent on specimen geometry. SEM images taken
of the fracture plane of several specimens indicated that pullout and fracture of the fibers occurred for both HPFRCC materials
studied here. |
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