Application of Instrumented Charpy Method in Characterisation of Materials

Alar, Željko; Mandić, Davor; Dugorepec, Andrija; Sakoman, Matija

doi:10.7906/indecs.13.3.12

Cited by 8 publications

(6 citation statements)

References 1 publication

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“…Therefore, it is postulated to add the test of real susceptibility to brittle fracture of structural steel cooled after undergoing a fire incident, as a recommended test, to the set of basic tests conditioning rational conclusions regarding the possibility of its further application in building structures [6]. In Authors' opinion the instrumented Charpy impact test [7][8][9][10][11] should be recommended in this field. The test of this type allows for determination and detailed analysis of the F − s curves depicting the relationship between the force breaking the tested sample and the displacement at the force application point.…”

Section: Introductionmentioning

confidence: 99%

Post-Fire Susceptibility to Brittle Fracture of Selected Steel Grades Used in Construction Industry—Assessment Based on the Instrumented Impact Test

et al. 2021

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The change in the value of the breaking energy is discussed here for selected steel grades used in building structures after subjecting the samples made of them to episodes of heating in the steady-state heating regime and then cooling in simulated fire conditions. These changes were recorded based on the instrumented Charpy impact tests, in relation to the material initial state. The S355J2+N, 1H18N9T steels and also X2CrNiMoN22-5-3 duplex steel were selected for detailed analysis. The fire conditions were modelled experimentally by heating the samples and then keeping them for a specified time at a constant temperature of: 600 °C (first series) and 800 °C (second series), respectively. Two alternative cooling variants were investigated in the experiment: slow cooling of the samples in the furnace, simulating the natural fire progress, without any external extinguishing action and cooling in water mist simulating an extinguishing action by a fire brigade. The temperature of the tested samples was set at the level of −20 °C and alternatively at the level of +20 °C. The conducted analysis is aimed at assessing the risk of sudden, catastrophic fracture of load-bearing structure made of steel degraded as a result of a fire that occurred previously with different development scenarios.

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Section: Introductionmentioning

confidence: 99%

Post-Fire Susceptibility to Brittle Fracture of Selected Steel Grades Used in Construction Industry—Assessment Based on the Instrumented Impact Test

et al. 2021

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“…Therefore it is postulated to add the test of real susceptibility to brittle fracture, as a recommended test, to the set of basic tests conditioning rational conclusions regarding the possibility of further application of structural steel cooled after undergoing a fire incident in building structures [6]. In our opinion the instrumented Charpy impact test [7][8][9][10][11] should be recommended in this field. In the following part of this paper we will show the way of interpreting the results obtained after application of this test [12,13].…”

Section: Introductionmentioning

confidence: 99%

Post-Fire Susceptibility to Brittle Fracture of Selected Steel Grades Used in Construction Industry – Assessment Based on the Instrumented Impact Test

Maślak¹,

Pazdanowski²,

Stankiewicz³

et al. 2021

Preprint

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The change in the value of the breaking energy is discussed here for selected steel grades used in building structures after subjecting the samples made of them to episodes of heating in the steady-state heating regime and then cooling in a simulated fire conditions. These changes were recorded based on the instrumented Charpy impact tests, in relation to the material initial state. The S355J2+N, 1H18N9T steels and also X2CrNiMoN22-5-3 duplex steel were selected for detailed analysis. The fire conditions were modelled experimentally by heating the samples and then keeping them for a specified time at a constant temperature of: 600°C (first series) and 800°C (second series), respectively. Two alternative cooling variants were investigated in the experiment: slow cooling of the samples in the furnace, simulating the natural fire progress, without any external extinguishing action, and cooling them in water mist simulating an extinguishing action by a fire brigade. The temperature of the tested samples was set at the level -20oC and alternatively at the level + 20oC. The conducted analysis is aimed at assessing the risk of sudden, catastrophic fracture of load-bearing structure made of steel degraded as a result of a fire previously occurred with different development scenarios.

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“…Even though the tensile test and impact test are dissimilar due to their different parameters to define a material strength, somewhat researchers show great interest in relating the two methods to save time and cost. Driven by the idea of discovering another way to acquire mechanical properties that are usually obtained by using the tensile test, Alar et al, [24] executed the instrumented Charpy impact test that allowed them to gather the result in term of the force-displacement curve and later compared the result with the tensile test. The yield force and maximum force from both tests indicated a good correlation between each other.…”

Section: Literature Reviewmentioning

confidence: 99%

Impact Strain Signal Characteristics of Al and Mg under Instrumented Charpy Test

Hikmah Zainuddin,

Mohd Basri Ali,

Nurlaela Muhammad Said

et al. 2024

ARASET

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Impact strain signal is used to examine strain signal patterns under various parameters. Impact is a complicated phenomenon that occurs within a millisecond timeframe. Material toughness is measured by the energy absorption recorded by the Charpy machine and closely related to the specimen fracture deformation. By utilizing the strain gauge and data acquisition, the impact strain signal provides additional data regarding impact duration, maximum strain value and the area under curve for a deeper understanding of the impact problem. A material with high toughness has great energy absorption and the capability to withstand high impact load. Although magnesium is lighter in weight compared to aluminium, aluminium is a better corrosion-resistant material and is stronger, which makes it more suitable to be fabricated as automotive structural components. Tensile test is typically used for investigating a material’s mechanical properties. In the automotive industry, materials are required to have good crashworthiness. This study investigates the relationship between the energy absorbed with the power spectral density and the area under strain–time graph for different materials, impact speeds, and material thicknesses. Furthermore, the relationship between the stress–strain curve and impact strain signal were examined. In this study, the behaviour of two materials, namely Aluminium 6061-T6 and Magnesium AM60, was investigated using instrumented Charpy test, by referring to the impact strain signal pattern result. For the experiment, strain gauge attached to the Charpy machine striker was employed and linked to the data acquisition system. Charpy impact specimen has three different thicknesses; 10 mm, 7.5 mm and 5 mm. Impact speed is at 3.35 m/s and 5.18 m/s. Results show a correlation between energy absorbed with strain energy. Strain energy obtained is directly proportional to the energy absorbed. Aluminium 6061-T6 has the highest energy absorption, maximum strain, and strain energy under power spectral density graph compared to Magnesium AM60. Relation of strain signal from Charpy test and stress–strain curve from tensile test shows a significant finding where the material deforms and fracture points are identified through the signal pattern and curve. Thus, the strain signal pattern can be used to predict material behaviour.

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Application of Instrumented Charpy Method in Characterisation of Materials

Cited by 8 publications

References 1 publication

Post-Fire Susceptibility to Brittle Fracture of Selected Steel Grades Used in Construction Industry—Assessment Based on the Instrumented Impact Test

Post-Fire Susceptibility to Brittle Fracture of Selected Steel Grades Used in Construction Industry—Assessment Based on the Instrumented Impact Test

Post-Fire Susceptibility to Brittle Fracture of Selected Steel Grades Used in Construction Industry – Assessment Based on the Instrumented Impact Test

Impact Strain Signal Characteristics of Al and Mg under Instrumented Charpy Test

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