Full-Field Temperature Measurement of Stainless Steel Specimens Subjected to Uniaxial Tensile Loading at Various Strain Rates

Żaba, K.; Trzepieciński, Tomasz; Rusz, Stanislav; Puchlerska, Sandra; Balcerzak, Maciej

doi:10.3390/ma14185259

Cited by 6 publications

(5 citation statements)

References 44 publications

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“…On the micro-level, the fracture surfaces of ductile materials exhibit voids generated by dislocation activities at the final fracture stage [ 32 , 33 ]. The nucleation of the voids takes place around the particles at the interface between the reinforcing phase and the matrix.…”

Section: Resultsmentioning

confidence: 99%

Static and Dynamic Properties of Al-Mg Alloys Subjected to Hydrostatic Extrusion

et al. 2022

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The aim of this study is to determine the influence of the amount of magnesium in Al-Mg alloys and strain rate on the grain refinement and mechanical properties of the material as determined in a dynamic tensile test. Hydrostatic extrusion was used to process the material. This method is not commonly used to impose severe plastic deformation of Al-Mg alloys. The article presents the results of static and dynamic strength tests on aluminium alloys subjected to plastic deformation in the hydrostatic extrusion process. Technically pure aluminium Al99.5 and three aluminium alloys with different magnesium content, Al-1Mg, Al-3Mg and Al-7.5Mg, were used in the tests. The samples were subjected to static tests using the uniaxial tensile test machine and dynamic tests using a rotary hammer. Compared to pure aluminium, increasing the magnesium content in Al-based alloys strengthened them in hydrostatic extrusion (logarithmic strain ε = 0.86) and caused an increase in the static ultimate tensile stress Rm, relative strain εr and the value of the yield stress. For strengthened aluminium alloys, an increase in the strain rate from 750 to 1750 s−1 caused an increase in the dynamic ultimate tensile stress from 1.2 to 1.9 times in relation to the static ultimate tensile stress. The increase in magnesium content results in the formation of a larger strengthening phase, influences a different state of stress during dynamic loading and leads to a change in the orientation of the fracture surface. It was also found that an increase in magnesium content is associated with an increased number of voids, which is also directly proportional to the strain rate in the dynamic rotary hammer test.

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Section: Resultsmentioning

confidence: 99%

Static and Dynamic Properties of Al-Mg Alloys Subjected to Hydrostatic Extrusion

et al. 2022

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“…The more measurements are made, the more accurate the final effect. Of course, this approach means longer measurement time and In the case of testing steel structures, the possibility of taking measurements during welding is also important [18][19][20][21][22]. It is required to use appropriate filters, but due to the lack of contact with the tested object, there is no risk of damaging the measuring sensor.…”

Section: D Laser Scannermentioning

confidence: 99%

Effectiveness of Selected Strain and Displacement Measurement Techniques in Civil Engineering

Szewczyk

Kudyba²

2022

Buildings

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The aim of this study was to assess how useful certain selected measurement techniques are in civil engineering. In this work, the focus was placed on the measurement of displacement and strain. Classical methods with an established position in the industry, such as electrical resistance strain gauge measurements and linear variable differential transducers (LVDT), were compared with modern techniques that do not require direct contact with the measured object, such as laser scanning and digital image correlation. A simply supported beam was bent in two types of tests. In the first test, a small load was applied on the beam, causing a slight deflection of the structure of approximately 0.5 mm. This enabled us to assess how effective the tested methods were, given the very precise measurement of the structure. In the second test, a much higher load was introduced, which caused displacement that can realistically be found in actual civil engineering structures. Ultimately, the model went through the plastic phase and was damaged. This enabled the measurement of displacement and strain that were much higher than those of the safe operating range of the structure. Based on conducted examinations, practical conclusions were drawn relative to the analyzed measurement methods.

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“…Using Equation (13), it is possible to indirectly determine the value of the coefficient of external friction µ(z) depending on the distance from the punch surface. The value of the coefficient of friction has been determined based on the form of the function σ z (z) describing stress distribution on the outer surface of the die, which was obtained in experimental measurements carried out using resistive strainometry, and the pressure distribution function p(z), which was obtained by analysing the images from X-ray tomography.…”

Section: Coefficient Of Frictionmentioning

confidence: 99%

“…The advantages of this method include the fact that the piezoelectric sensor, unlike strain gauges, is reusable. Another method used to measure deformation is the non-contact system for 3D deformation analysis and digital image correlation (DIC) which consists in overlaying photos taken at different angles with the help of a camera set, resulting in the creation of a graphical map of deformations [13,14]. This method allows the value of the deformation on the entire surface of the test element to be determined.…”

Section: Introductionmentioning

confidence: 99%

Experimental Compaction of a High-Silica Sand in Quasi-Static Conditions

Szwajka

Szewczyk²,

Trzepieciński³

2022

Materials

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In the compaction process, an uneven densification of the powder through the entire height of the die is a major problem which determines the strength properties of the final product, which vary throughout the entire volume. The aim of this investigation was to determine the distribution of the forming pressure inside the die and to visualise the differences in compaction. To determine the pressure inside the die during the compaction process, the deformation on the die surface was measured by means of strain gauges. However, in order to visualise the densification of high-silica sand during the compaction process, an X-ray tomograph was used, which permits one to visualise the interior of the die. The authors developed an analytical model of how the change in internal pressure influences the change in stresses arising on the outer surface of the die, and, as a result, the friction force. It has been observed that the highest values of pressure as well as the highest concentrations of the loose medium are found closest to the punch and decrease with distance from the punch. Moreover, based on the measurements of deformation, a dependence of the pressure distribution on the value of friction forces was observed, which prompted further analysis of this phenomenon. As a result, tests to determine the coefficient of friction between the die and the loose medium were carried out. This made it possible to describe the pressure distribution inside the die, based on the pressure applied and the height of the die.

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Full-Field Temperature Measurement of Stainless Steel Specimens Subjected to Uniaxial Tensile Loading at Various Strain Rates

Cited by 6 publications

References 44 publications

Static and Dynamic Properties of Al-Mg Alloys Subjected to Hydrostatic Extrusion

Static and Dynamic Properties of Al-Mg Alloys Subjected to Hydrostatic Extrusion

Effectiveness of Selected Strain and Displacement Measurement Techniques in Civil Engineering

Experimental Compaction of a High-Silica Sand in Quasi-Static Conditions

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