Repeated-Impact Response of Ultrashort Steel Fiber Reinforced Concrete

Wang, Z.L.; Zhu, Hehua; Wang, Jianguo

doi:10.1111/j.1747-1567.2011.00722.x

Cited by 26 publications

(5 citation statements)

References 15 publications

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“…Based on the strain equivalence hypothesis proposed by Lemaitre, 39,50 the damage caused by repeated impact can be characterized by the change of the dynamic elastic modulus as follows.

D_{E} goodbreak= 1 goodbreak- \frac{E_{normaln}}{E_{1}}

where E 1 and E n are the dynamic elastic modulus in the first and n th impact, respectively.…”

Section: Damage Evaluation Methodsmentioning

confidence: 99%

“…Hence, it is crucial to reveal the damage evolution law of UHPFRC subjected to repeated impact loads. Wang et al 39 utilized the elastic modulus calculated from the ascending segment of the stress–strain curve to quantify the damage in steel fiber‐reinforced concrete. Lai et al 40 employed ultrasonic velocity measurements to assess the damage of reactive powder concrete after different impact numbers.…”

Section: Introductionmentioning

confidence: 99%

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A novel damage evaluation method for ultra‐high‐performance fiber reinforced concrete under multiple impact loads

Shi,

Chen,

Ning

et al. 2023

Fatigue Fract Eng Mat Struct

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In this study, repeated compression tests were conducted for ultra‐high‐performance fiber reinforced concrete (UHPFRC) under three different impact pressures. Results showed that as the impact number increased, the strain rate approximately showed a proportional increase, and the plateau region of the dynamic stress–strain curve became more prominent. Besides, when the repeated impacts increased, the maximum strain and dynamic toughness both exhibited upward trends, while the peak stress decreased. The average toughness was positively correlated with the strain rate. Additionally, under high repeated impact loads, a single crack propagated rapidly within the UHPFRC specimen after single impact. Conversely, cracks propagated from the center to the periphery on the surface of the specimen when repeated loads were low. Furthermore, a quantitative evaluation method for the damage of UHPFRC under repeated impact loads was proposed based on the characteristic parameters of the gray‐level co‐occurrence matrix (GLCM).

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“…Based on the strain equivalence hypothesis proposed by Lemaitre, 39,50 the damage caused by repeated impact can be characterized by the change of the dynamic elastic modulus as follows.

D_{E} goodbreak= 1 goodbreak- \frac{E_{normaln}}{E_{1}}

where E 1 and E n are the dynamic elastic modulus in the first and n th impact, respectively.…”

Section: Damage Evaluation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel damage evaluation method for ultra‐high‐performance fiber reinforced concrete under multiple impact loads

Shi,

Chen,

Ning

et al. 2023

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Split Hopkinson pressure bar (SHPB) device is an effective technique to analyze and characterize the mechanical properties and dynamic behaviors of brittle materials at high strain rate. In recent years, researchers studied the dynamic mechanical properties of brittle materials, such as rock or rock-like materials [19,20,21,22,23], concrete-like materials [24,25,26,27,28], and ceramics materials [29,30], by using an SHPB device under strain rates ranging from 10 2 to 10 4 s −1 . Many factors have obvious influences on the strain rate sensitivity of concrete.…”

Section: Introductionmentioning

confidence: 99%

Effect of Silica Fume in Concrete on Mechanical Properties and Dynamic Behaviors under Impact Loading

Zhao

Zhang

2019

Materials

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The effect of silica fume (SF) in concrete on mechanical properties and dynamic behaviors was experimentally studied by split Hopkinson pressure bar (SHPB) device with pulse shaping technique. Three series of concrete with 0, 12%, and 16% SF as a cement replacement by weight were produced firstly. Then the experimental procedure for dynamic tests of concrete specimens with SF under a high loading rate was presented. Considering the mechanical performance and behaviors of the concrete mixtures, those tests were conducted under five different impact velocities. The experimental results clearly show concrete with different levels of SF is a strain-rate sensitive material. The tensile strength under impact loading of the tested specimens was generally improved with the increasing content of SF levels in concrete. Additionally, the tensile strength under impact loading of the concrete enhances with the increase of the strain rates. Finally, failure modes, dynamic tensile strength, dynamic increase factor (DIF), and critical strain are discussed and analyzed. These investigations are useful to improve the understanding of the effect of SF in concrete and guide the design of concrete structures.

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“…Various experiments devices have been used to explore a wide range of strain rates. Split Hopkinson pressure bar (SHPB) technique, which decouples cleverly the inertia effect in structures and strain rate effect in materials, has been widely used to characterize the dynamic performance of various engineering materials at high strain rate, such as rock [29][30][31][32][33], concrete [34][35][36][37][38], and ceramics [39,40] at high strain rates (10 2 ∼10 4 s −1 ). e strain rate sensitive behavior of brittle materials has been under investigation for several decades.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Crack Propagation and Fracture Behavior of Pre-cracked Specimens under Impact Loading by Split Hopkinson Pressure Bar

Zhao

Zhang

2019

Advances in Materials Science and Engineering

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Deformation and fracture of brittle materials, especially crack propagation, have drawn wide attention in recent years. But dynamic crack propagation under impact loading was not well understood. In this paper, we experimentally tested Brazilian disk (BD) fine sandstone specimens containing pre-cracks under cyclic impact loading by the Φ 74 mm diameter split Hopkinson pressure bar (SHPB) test device. The pre-cracked specimens were named central straight through crack flattened Brazilian disk (CSCFBD). By using the low air-pressure loading conditions (0.1 MPa, equal to the impact velocity of 3.76 m/s), a series of dynamic impact tests were detected successfully, and the effects of pre-cracks on dynamic properties were analyzed. Experimental results show that the multiple cracks mostly initiate at/or near the pre-crack tips and then propagate in different paths and directions varying by inclination angles, leading to the ultimate failure. Compared to static or quasi-static loading, dynamic crack propagation and fracture behavior are obviously different. Furthermore, we characterized the crack propagation paths, directions, and fracture patterns and discussed the influences of the pre-cracks during the breakage process. We concluded that the results obtained are significant in investigating the failure mechanism and mechanical properties of brittle materials under impact loading.

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Repeated-Impact Response of Ultrashort Steel Fiber Reinforced Concrete

Cited by 26 publications

References 15 publications

A novel damage evaluation method for ultra‐high‐performance fiber reinforced concrete under multiple impact loads

A novel damage evaluation method for ultra‐high‐performance fiber reinforced concrete under multiple impact loads

Effect of Silica Fume in Concrete on Mechanical Properties and Dynamic Behaviors under Impact Loading

Dynamic Crack Propagation and Fracture Behavior of Pre-cracked Specimens under Impact Loading by Split Hopkinson Pressure Bar

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