An Improved Lagrangian-Inverse Method for Evaluating the Dynamic Constitutive Parameters of Concrete

Yu, Xiaodong; Fu, Yingqian; Dong, Xiaomei; Zhou, Fenghua; Ning, Jianguo

doi:10.3390/ma13081871

Cited by 7 publications

(5 citation statements)

References 48 publications

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“…

where

is the static strength and

is the dynamic maximal compression stress. When analyzing the dynamic properties of concrete by an SHPB device, the increase rate of the dynamic strength is often evaluated by the relationship between DIF and the logarithm of strain rate [ 29 , 30 , 31 , 32 , 34 , 35 , 36 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

“…The dynamic mechanical properties of concrete materials have attracted much attention, and the Split Hopkinson Pressure Bar (SHPB) has been used as a common testing device to evaluate materials' impact performance. The strain rate sensitivity is proven to be one of the significant properties of concrete [28][29][30][31][32][33]. In recent years, some researchers found that severe environmental factors would seriously deteriorate the dynamic performance of concrete [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

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An Experimental Study on the Dynamic Mechanical Properties of Epoxy Polymer Concrete under Ultraviolet Aging

Liao

Liu

et al. 2021

Materials

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Epoxy polymer concrete (EPC) is widely applied in engineering for its excellent mechanical properties. The impact loads and severe climatic conditions such as ultraviolet radiation, temperature change and rain erosion are in general for its engineering practice, potentially degrading the performance of EPC. In this paper, a procedure of accelerated aging for EPC, imitating the aging effect of ultraviolet radiation and hygrothermal conditions based on the meteorological statistics of Guangzhou city, was designed. After various periods of accelerated aging, the dynamic behaviors of EPC were studied by using a Split Hopkinson Pressure Bar (SHPB). The verification of the experimental data was performed. The two-stage dynamic compression stress-strain curves were obtained: (a) linear growth stage following by strain hardening stage at impact velocity 12.2 m/s and 18.8 m/s, (b) linear growth stage and then a horizontal stage when impact velocity is 25.0 m/s, (c) linear growth stage following by strain softening stage at impact velocity 29.2 m/s. The experimental results show that the specimens after longer accelerated aging tend to be more easily broken, especially at impact velocity 12.2 m/s and 18.8 m/s, while the strain rate is the main factor affecting the compression strength and stiffness. Ultimately the influence of strain rate and equivalent aging time on dynamic increase factor was revealed by a fitting surface.

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“…

where

is the static strength and

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Experimental Study on the Dynamic Mechanical Properties of Epoxy Polymer Concrete under Ultraviolet Aging

Liao

Liu

et al. 2021

Materials

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“…In 2019, Ding et al introduced multichannel photon Doppler velocimeter (PDV) technology on the basis of the "nV + T0" analysis method and obtained the dynamic constitutive relationship of PMMA [138]. In the year of 2020, Yu et al combined the Lagrangian inverse analysis method with optical technology and proposed an improved "lsv + nv" analysis method to obtain the dynamic constitutive behavior of ordinary concrete under high-strain-rate loading [139]. All the above studies confirm the effectiveness and reliability of the combination of the Lagrangian analysis method and the split-Hopkinson pressure bar technique.…”

Section: Application Of Lagrangian Analysis Methods To Impact Test Of...mentioning

confidence: 99%

Review of SHPB Dynamic Load Impact Test Characteristics and Energy Analysis Methods

Yang,

Li,

Qiao

2023

Processes

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Since the split-Hopkinson pressure bar (SHPB) test technology was proposed, it has played an important role in the study of dynamic mechanical properties of materials under the impact of dynamic load. It is a major test technology for the study of dynamic mechanical properties of materials. The expansion of the range of materials studied has also posed a challenge to the SHPB test technique, requiring some improvements to the conventional SHPB test apparatus and analysis methods to meet the test conditions and ensure the accuracy of its results. Based on a systematic review of the development of the SHPB test technique and the test principles, the main factors that influence the test’s ability to meet the two basic assumptions at this stage are analyzed, and the ways to handle them are summarized. The stress wave dispersion phenomenon caused by the transverse inertia effect of the pressure bar means that the test no longer satisfies the one-dimensional stress wave assumption, while the pulse-shaping technique effectively reduces the wave dispersion phenomenon and also has the effect of achieving constant strain rate loading and promoting the dynamic stress equilibrium of the specimen. Impedance matching between the pressure bar and specimen effectively solves the problem of the test’s difficulty because the transmitted signal is weak, and the assumption that the stress/strain is uniformly distributed along the length of the specimen is not satisfied when studying low-wave impedance material with the conventional SHPB test device. The appropriate pressure bar material can be selected according to the value of the wave impedance of the test material. According to the wave impedance values of different materials, the corresponding suggestions for the selection of pressure bar materials are given. Moreover, a new pressure bar material (modified gypsum) for materials with very-low-wave impedance is proposed. Finally, for some materials (foamed concrete, aluminum honeycomb, porous titanium, etc.) that cannot meet the two basic assumptions of the test, the Lagrangian analysis method can be combined with SHPB test technology application. Based on the analysis and calculation of the energy conservation equation, the dynamic constitutive relationship of the materials can be obtained without assuming the constitutive relationship of the experimental materials.

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“…For a traction separation model, the stiffness of the interface relating the nominal traction stress to the separation displacement can be carried over to a cohesive layer of the initial thickness, T 0 , as described in Equation (14).…”

Section: Cohesive Elements Of Itzmentioning

confidence: 99%

“…[ 5 , 6 , 7 , 8 , 9 ]. Especially for brittle materials, the influence of the boundary conditions has a pronounced effect on the mechanical performance of the quickly softening regime caused by the evolution of the inherent damage [ 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

A 3D Meso-Scale Model and Numerical Uniaxial Compression Tests on Concrete with the Consideration of the Friction Effect

Wang,

Yu,

et al. 2024

Materials

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Achieving the real mechanical performance of construction materials is significantly important for the design and engineering of structures. However, previous researchers have shown that contact friction performs an important role in the results of uniaxial compression tests. Strong discreteness generally appears in concrete-like construction materials due to the random distribution of the components. A numerical meso-scale finite-element (FE) method provides the possibility of generating an ideal material with the same component percentages and distribution. Thus, a well-designed meso-FE model was employed to investigate the effect of friction on the mechanical behavior and failure characteristics of concrete under uniaxial compression loading. The results showed that the mechanical behavior and failure profiles of the simulation matched well with the experimental results. Based on this model, the effect of friction was determined by changing the contact friction coefficient from 0.0 to 0.7. It was found that frictional contact had a slight influence on the elastic compressive mechanical behavior of concrete. However, the nonlinear hardening behavior of the stress–strain curves showed a fairly strong relationship with the frictional contact. The final failure profiles of the experiments showed a “sand-glass” shape that might be expected to result from the contact friction. Thus, the numerical meso-scale FE model showed that contact friction had a significant influence on both the mechanical performance and the failure profiles of concrete.

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An Improved Lagrangian-Inverse Method for Evaluating the Dynamic Constitutive Parameters of Concrete

Cited by 7 publications

References 48 publications

An Experimental Study on the Dynamic Mechanical Properties of Epoxy Polymer Concrete under Ultraviolet Aging

An Experimental Study on the Dynamic Mechanical Properties of Epoxy Polymer Concrete under Ultraviolet Aging

Review of SHPB Dynamic Load Impact Test Characteristics and Energy Analysis Methods

A 3D Meso-Scale Model and Numerical Uniaxial Compression Tests on Concrete with the Consideration of the Friction Effect

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