The Dynamic Mechanical Constitutive Equation of Concrete under High Temperture

Jia, Baohua; Li, Zheng Liang; Tao, Jun Lin; Zhang, Chun Tao

doi:10.4028/www.scientific.net/amm.99-100.782

Cited by 10 publications

(4 citation statements)

References 3 publications

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“…Concrete is obviously a brittle material under freeze–thaw action and impact load, and its plastic strain is very small. Therefore, the plastic deformation part can be ignored [ 22 ]. The concrete damage is continuous during the loading process.…”

Section: Dynamic Visco-elastic Damage Constitutive Modelmentioning

confidence: 99%

“…Studies have shown that [ 22 , 23 , 24 , 25 , 26 , 27 ] Weibull distribution is particularly suitable for describing the fracture process of materials such as concrete and rock, then

where

and

are the scale parameters and shape parameters, respectively.

is the position parameter, which was the damage threshold.…”

Section: Dynamic Visco-elastic Damage Constitutive Modelmentioning

confidence: 99%

“…Studies have shown that [22][23][24][25][26][27] Weibull distribution is particularly suitable for describing the fracture process of materials such as concrete and rock, then…”

Section: Damage Variablementioning

confidence: 99%

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Dynamic Mechanical Properties and Visco-Elastic Damage Constitutive Model of Freeze–Thawed Concrete

Zhai

Liang

et al. 2020

Materials

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To study the dynamic mechanical characteristics and constitutive relation of concrete materials under freeze–thaw (FT) cycle conditions, C35 concrete was taken as the research object in this paper, and FT tests were carried out with a freeze–thaw range of −20–20 °C and a freeze–thaw frequency up to 50 times. By using the separated Hopkinson pressure bar (SHPB) system, impact compression tests of concrete specimens under different FT cycle actions were developed, then the dynamic fracture morphology, fracture block distribution, stress–strain curve, peak stress and other dynamic mechanical properties of concrete were analyzed, and the influence law of FT action and strain rate was obtained. Through introducing the freeze–thaw deterioration damage factor and the stress damage variable, the dynamic visco-elastic damage constitutive equation of freeze–thawed concrete was constructed based on component combination theory. Furthermore, the damage evolution process and mechanism of freeze–thawed concrete materials were revealed. The research results show that the dynamic mechanical properties of concrete under a freeze–thaw environment are the combined results of the freeze–thaw deterioration effect and the strain rate strengthening effect. The dynamic visco-elastic damage constitutive model established in this paper can effectively describe the dynamic mechanical properties of freeze–thawed concrete, and has the characteristics of few parameters and good effect. The stress damage evolution path of concrete goes backward with the increase of FT cycles and the development speed gradually slows down. The greater the difference in FT cycles, the greater the difference in stress damage path.

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Section: Dynamic Visco-elastic Damage Constitutive Modelmentioning

confidence: 99%

“…Studies have shown that [ 22 , 23 , 24 , 25 , 26 , 27 ] Weibull distribution is particularly suitable for describing the fracture process of materials such as concrete and rock, then

where

and

are the scale parameters and shape parameters, respectively.

is the position parameter, which was the damage threshold.…”

Section: Dynamic Visco-elastic Damage Constitutive Modelmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic Mechanical Properties and Visco-Elastic Damage Constitutive Model of Freeze–Thawed Concrete

Zhai

Liang

et al. 2020

Materials

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“…Concrete is a non-homogeneous brittle material with a low plastic strain, and the plastic deformation of concrete can be partially neglected. The damage to concrete is continuous during dynamic loading, and it can be assumed that the strength of each microunit obeys a probability distribution

[ 47 ]; the damage factor

is related to

…”

Section: Dynamic Constitutive Model Of Pfrcmentioning

confidence: 99%

Dynamic Compression Mechanical Properties of Polyoxymethylene-Fiber-Reinforced Concrete

Guo

Yan

et al. 2022

Materials

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The excellent overall performance of polyoxymethylene (POM) fiber enables it to show great potential for engineering applications. The effect of POM fibers on the dynamic compression mechanical properties of concrete is an important issue for its application in engineering structures such as airport pavement and bridges. It is necessary to investigate the dynamic compressive mechanical properties of POM-fiber-reinforced concrete (PFRC) under impact loading. The PFRC specimens with various POM fiber lengths (6, 8, 12, 16, and 24 mm) and ordinary-performance concrete (OPC) specimens were tested by utilizing the split Hopkinson pressure bar (SHPB). We studied the effect of fiber length and strain rate on the dynamic compression mechanical properties of PFRC and established a damage dynamic constitutive model for PFRC. The results indicate that the dynamic compressive strength, peak strain, ultimate strain, dynamic peak toughness, dynamic ultimate toughness, and dynamic increase factor (DIF) of the PFRC increased obviously with the increase in strain rate. POM fiber was found to be able to effectively improve the deformation ability and impact toughness of concrete. The dynamic compressive strength and impact toughness of PFRC with a fiber length of 8 mm was optimal at different strain rates. The POM fibers with 16 mm and 24 mm lengths negatively affected the dynamic compressive strength of the concrete. The fiber length variation had an insignificant effect on the DIF of PFRC. The established damage dynamic constitutive model for PFRC was fitted and analyzed, and it was found that the model is able to describe the dynamic characteristics of PFRC well. This study can extend POM fibers to engineering structures that may be subjected to impact loading and act as a reference for the design of PFRC under impact loading.

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Thermal degradation of dynamic compressive strength for two mortars

Yao

Liu

et al. 2017

Construction and Building Materials

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The Dynamic Mechanical Constitutive Equation of Concrete under High Temperture

Cited by 10 publications

References 3 publications

Dynamic Mechanical Properties and Visco-Elastic Damage Constitutive Model of Freeze–Thawed Concrete

Dynamic Mechanical Properties and Visco-Elastic Damage Constitutive Model of Freeze–Thawed Concrete

Dynamic Compression Mechanical Properties of Polyoxymethylene-Fiber-Reinforced Concrete

Thermal degradation of dynamic compressive strength for two mortars

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