Pure rate effect on the concrete compressive strength in the split Hopkinson pressure bar test

Lee, Sang-Ho; Kim, Kyoung-Min; Park, Jamin; Cho, Jae-Yeol

doi:10.1016/j.ijimpeng.2017.11.015

Cited by 78 publications

(33 citation statements)

References 14 publications

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“…2. For each DIF case, pure rate DIF was obtained by eliminating inertia effects from apparent DIF in accordance with Lee et al [5]. Eqns (1) and (2) indicate the pure rate DIFs from D150 H300 specimen and the same diameter specimen, respectively.…”

Section: Shpb Test Resultsmentioning

confidence: 99%

“…As results of the analyses, stresses of the incident and transmitted bars were obtained, and dynamic strength was calculated using one-dimensional stress wave theory. Then, apparent strength ratio was calculated using eqn (3), which was introduced to evaluate predictive accuracy of DIF by Lee et al [5]. If apparent strength ratio is close to 1, it means that the corresponding DIF gives good prediction.…”

Section: Finite Element Analysis Program and Resultsmentioning

confidence: 99%

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Effect of Specimen Size of Static Compressive Test on the Dynamic Increase Factor of Concrete Compressive Strength

Lee

Kim

Cho

2018

WIT Transactions on the Built Environment

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Compressive strength of concrete increases as the strain rate increases, so this rate effect should be considered when conducting finite element analysis to evaluate behavior of structure under high strain rate. Accordingly, numerous split Hopkinson pressure bar (SHPB) tests have been conducted to evaluate dynamic strength at high strain rate. However, there is no standard test method for SHPB test. As a result, researchers have performed SHPB test for concrete and analyzed the results as their own method. Especially, since various sizes of specimen have been used for SHPB test, various shapes and sizes of specimens have been used for static compressive test to obtain static strength. In this study, SHPB test for concrete specimen was performed. Then, finite element analyses of concrete SHPB test were conducted using two types of dynamic increase factor (DIF) obtained from two types of static strengths in order to find out which static strength is appropriate to obtain DIF; one is static strength from standard cylinder specimen, and the other is static strength from specimen of same diameter as that of specimen of SHPB test. Then, the results were compared to each other. The comparison showed that DIF obtained from standard cylinder test is more valid than DIF obtained from specimen of same diameter as SHPB test specimen.

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Section: Shpb Test Resultsmentioning

confidence: 99%

Section: Finite Element Analysis Program and Resultsmentioning

confidence: 99%

Effect of Specimen Size of Static Compressive Test on the Dynamic Increase Factor of Concrete Compressive Strength

Lee

Kim

Cho

2018

WIT Transactions on the Built Environment

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“…Then, the apparent DIFs, which involve other effects as well as rate effect, were calculated as the ratio of compressive strength to find out the influence of heterogeneity induced by the different size of aggregate. Furthermore, the pure rate DIFs, which removes the inertia effect from the apparent DIF, suggested by Lee et al [1], were evaluated to confirm the effect of maximum aggregate size on strength enhancement at various strain rate.…”

Section: Limitations Of Previous Studiesmentioning

confidence: 99%

“…And by comparing apparent dynamic increase factor (DIF) of compressive strength, which involves rate effect and other effects such as inertia effect and etc., the effect of homogeneity according to the maximum aggregate size was investigated. Furthermore, to consider pure rate effect on mortar and concrete, pure rate DIF suggested by Lee et al [1] was calculated and compared according to the maximum aggregate size.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation Into the Effect of Aggregate Size on Dynamic Compressive Strength of Mortar and Concrete

Kim

Lee

Cho

2018

WIT Transactions on the Built Environment

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Split Hopkinson pressure bar (SHPB) has been widely used to the obtain dynamic strength of materials such as metals and concrete-like materials at high strain rates. A specimen size for SHPB test is limited depending on diameters of each SHPB apparatus. Especially for concrete SHPB test, maximum aggregate of small size has been used to avoid constraints in preparing small specimens. However, it has not been validated whether specimen with small maximum aggregate represents concrete material properties with large maximum aggregate size used normally for concrete structures, or not. This study conducted concrete and mortar SHPB tests under the same test conditions using a variety of maximum aggregate sizes to investigate the effect of maximum aggregate size on results of SHPB test. Then, the obtained values of dynamic increase factor (DIF), which is defined as a ratio of dynamic compressive strength to static compressive strength, were compared to one another. The results show that it is necessary to consider the effect of maximum aggregate size on concrete compressive DIF. In addition, the results can be used to establish guidance about the specimen of SHPB test.

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“…In order to determine the J-C material model, it is essential to conduct dynamic experiments along with quasi-static and high temperature experiments. That needs a SHPB test setup, which is immensely studied [14][15][16][17][18]. Many studies pertain to the identification of the J-C model parameters were performed via the setups.…”

Section: Introductionmentioning

confidence: 99%

Confirmation of Johnson-Cook Model Parameters for Nimonic 80A alloy by Finite Element Method

Korkmaz¹,

Günay²

2020

Politeknik Dergisi

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Bu makaleye şu şekilde atıfta bulunabilirsiniz(To cite to this article): Korkmaz, M.E and Günay, M., "Confirmation of johnson-cook model parameters for nimonic 80A alloy by finite element method", Politeknik Dergisi, 23(3): 625-632, (2020).Erişim linki (To link to this article): http://dergipark.org.tr/politeknik/archive Highlights  The determination of material constitutive model (Johnson-Cook) of Nimonic 80A superalloy.  Three different types of compression tests (quasi-static, dynamic and high temperatures) in order to determine the equation parameters.  The confirmation of Johnson-Cook parameters of Nimonic 80A superalloy.  A suggestion of finite element simulation of any plastic deformation processes such as forging, rolling and deep drawing by using JC parameters of Nimonic 80A material as a next study. Graphical AbstractThe aim of the study is to confirm the predetermined J-C model parameters for Nimonic 80A superalloys using finite element method. Figure. Experimental procedure AimThe aim of the study is to confirm the predetermined J-C model parameters for Nimonic 80A superalloys using finite element method. Design & MethodologyJC parameters of Nimonic 80A nickel-based superalloys were identified via quasi-static tests, dynamic tests and different temperature tests. OriginalityBy considering the literature, it is obviously seen that there is no study on simulation of plastic deformation processes based on finite element method for Nimonic 80A superalloy. FindingsThe mean deviation between experimental results and simulation results obtained with FEM were calculated as average of %3.23. ConclusionConsequently, the Johnson-Cook model parameters of Nimonic 80A was confirmed based on overall results. Hence, it was concluded that JC model parameters of the material can be confidently used for any plastic deformation processes. ABSTRACTNimonic 80A superalloy is frequently used due to its high creep resistance, oxidation resistance and high resistance to high temperature corrosion. On the other hand, due to compatibility of simulation of plastic deformation processes, Johnson-Cook model is chosen among the materials models such as Zerille Armstrong, Bordner Partom, Steinberg-Guinan etc. In this study, primarily, quasi-static compression tests were performed for 10-3, 10-2 and 10-1 s-1 strain rates at room temperature. Secondly, dynamic compression tests were secondly conducted at high strain rates ranging from 370 to 954 s-1 using the Split Hopkinson Pressure Bar (SHPB) apparatus. Then, the compression tests were conducted at a temperature level from 24~200 °C at the reference strain rate. Johnson-Cook model parameters of Nimonic 80A were determined by analyzing the data obtained from the tests. Lastly, the compression simulations with finite element method (FEM) were performed in ANSYS Workbench to confirm the accuracy of the parameters. In the light of the results, it was determined that there is an average of %3.23 deviation between the experimental and the simulation values. The result showed that acc...

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Pure rate effect on the concrete compressive strength in the split Hopkinson pressure bar test

Cited by 78 publications

References 14 publications

Effect of Specimen Size of Static Compressive Test on the Dynamic Increase Factor of Concrete Compressive Strength

Effect of Specimen Size of Static Compressive Test on the Dynamic Increase Factor of Concrete Compressive Strength

Experimental Investigation Into the Effect of Aggregate Size on Dynamic Compressive Strength of Mortar and Concrete

Confirmation of Johnson-Cook Model Parameters for Nimonic 80A alloy by Finite Element Method

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