Yu et al. (2018) — Rate-dependent tensile properties of ultra-high performance...

Citation

Ke-Quan Yu, Jian-Guo Dai, Zhou-Dao Lu, Chi-Sun Poon (2018). Rate-dependent tensile properties of ultra-high performance engineered cementitious composites (UHP-ECC). Cement and Concrete Composites, Vol. 93, pp. 218-234.

DOI: 10.1016/j.cemconcomp.2018.07.016
Atlas layer: extension
Related Victor Li book chapter: Chapter 5: Ultra-High Performance ECC; Chapter 8: Dynamic and Impact Performance
Source PDF: yu-2018-rate-dependent-tensile-properties-of-ultra-high.pdf
Extracted text: atlas/full_text/yu-2018-rate-dependent-tensile-properties-of-ultra-high_full_text.md
Source note: atlas/source_notes/yu-2018-rate-dependent-tensile-properties-of-ultra-high_source_note.md

Why this paper matters

Characterizes the rate sensitivity of 150 MPa UHP-ECC across strain rates from quasi-static ($0.0001\text{ s}^{-1}$) to seismic loading ($0.05\text{ s}^{-1}$) for three PE fiber aspect ratios ($L_f/d_f = 500, 750, 900$), proving that initial cracking stress increases by $>50\%$ and tensile strength reaches 18.81 MPa while retaining $>6\%$ tensile strain capacity.

Main contribution

Quantified tensile rate sensitivity of UHP-ECC from quasi-static to seismic strain rates ($0.0001\text{--}0.05\text{ s}^{-1}$).
Demonstrated that $L_f/d_f = 900$ PE fibers maintain high tensile strain capacity ($6.13\%$) and energy absorption ($>1000\text{ kJ/m}^3$) under seismic strain rates without embrittlement.
Validated rate-dependent fiber-matrix interfacial friction enhancement via single-fiber pullout testing.

Evidence summary

UHP-ECC-900 properties across strain rates:
$\dot{\varepsilon} = 0.0001\text{ s}^{-1}$: $\sigma_{tc} = 10.04\text{ MPa}$, $\sigma_{tu} = 17.40\text{ MPa}$, $\varepsilon_{tu} = 7.56\%$, $g_{se} = 1098.8\text{ kJ/m}^3$
$\dot{\varepsilon} = 0.05\text{ s}^{-1}$: $\sigma_{tc} = 15.31\text{ MPa}$ (+52%), $\sigma_{tu} = 18.81\text{ MPa}$, $\varepsilon_{tu} = 6.13\%$, $g_{se} = 1023.0\text{ kJ/m}^3$ (Table 6, page 220).
Matrix and single-fiber tests: Matrix cracking strength and single-fiber pullout resistance both increase with loading velocity.
Compressive strength: 150 MPa at 28 days (50 mm cubes).

Linked Atlas nodes

02_concepts/extreme_ductility_ecc.md
02_concepts/interface_properties.md
05_experiments/direct_tensile_test.md
02_concepts/strain_hardening_criteria.md

Claim-evidence rows to add

Atlas node	Claim	Evidence summary	Page/Figure/Table	Status
`02_concepts/extreme_ductility_ecc.md`	UHP-ECC-900 maintains direct tensile strain capacity >6.1% and tensile strength of 18.81 MPa under seismic strain rates (0.05 s⁻¹).	Under $\dot{\varepsilon} = 0.05\text{ s}^{-1}$, $\sigma_{tu}$ reached 18.81 MPa and strain capacity remained 6.13% with strain energy $>1000\text{ kJ/m}^3$.	Page 220, Table 6, Figs. 6, 7	verified_from_pdf
`02_concepts/interface_properties.md`	Increasing loading rate significantly increases initial cracking strength (DIF > 1.5) due to rate-enhanced matrix toughness and fiber-matrix interfacial friction.	$\sigma_{tc}$ increased from 10.04 MPa to 15.31 MPa as strain rate increased from $10^{-4}$ to $5 \times 10^{-2}\text{ s}^{-1}$.	Page 220, Table 6, Section 4	verified_from_pdf

Verification status

PDF preserved: yes (yu-2018-rate-dependent-tensile-properties-of-ultra-high.pdf)
Text extracted: yes (atlas/full_text/yu-2018-rate-dependent-tensile-properties-of-ultra-high_full_text.md)
DOI verified: yes (10.1016/j.cemconcomp.2018.07.016)
Page/figure/table verified: yes
Claim-evidence matrix ready: yes

Cautions

Tested up to $0.05\text{ s}^{-1}$; higher ballistic/impact strain rates require Split-Hopkinson Pressure Bar testing.