Simulation of Stress Concentrations in Notches

Chmelko, Vladimír; Žlábek, Pavel; Margetin, Matúš; Ďurka, Róbert

doi:10.3390/met12010043

Cited by 14 publications

(6 citation statements)

References 16 publications

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“…[38] and a recent work by Chmelko et al [39]. The elastic solution in Figure 8b dropped to a lower level at which the stress field was placed dominantly within the elastic domain.…”

Section: Finite Element Analysis and Stress Distributionmentioning

confidence: 59%

“…The elastic solution in Figure 8b dropped to a lower level at which the stress field was placed dominantly within the elastic domain. [38] and a recent work by Chmelko et al [39]. The elastic solution in Figure 8b dropped to a lower level at which the stress field was placed dominantly within the elastic domain.…”

Section: Finite Element Analysis and Stress Distributionmentioning

confidence: 63%

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Local Ratcheting at the Notch Region of Non-Press-Fitted and Press-Fitted Al 7075-T6 Samples Undergoing Asymmetric Stress Cycles

Hatami,

Varvani-Farahani

2023

Metals

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The present study evaluated the ratcheting response of notched and press-fitted Al 7075-T6 specimens under stress-controlled asymmetric cycles. The degree of the interference fit (DIF) directly influenced the magnitude and the rate of progressive plastic strain at the notch edge region. Local ratcheting at the hole–pin interference region was analyzed by means of two kinematic-hardening rules—the Ahmadzadeh–Varvani (A–V) rule and the Chaboche rule—coupled with the Neuber rule. Ratcheting strains at the notch root of aluminum samples with DIF = 0 (non-press-fitting samples) were measured and found to be the highest in magnitude. For the press-fitted samples, however, ratcheting strains dropped noticeably as the DIF increased from 1% to 2%. The press-fitting process plastically deformed the perimeter edges of the notches and improved the materials strength locally at the notch edges, resulting in better resistance against ratcheting progress. Local ratcheting strains at distances of 0.5, 1.3, and 3.0 mm from the notch roots were predicted for both pinned and unpinned samples via the hardening rules and were compared with those of measured ratcheting values. The ratcheting curves predicted by means of the A-V and Chaboche hardening rules closely agreed with the experimental data. The predicted ratcheting curves were positioned, respectively, above and below the measured ratcheting data.

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“…[38] and a recent work by Chmelko et al [39]. The elastic solution in Figure 8b dropped to a lower level at which the stress field was placed dominantly within the elastic domain.…”

Section: Finite Element Analysis and Stress Distributionmentioning

confidence: 59%

Section: Finite Element Analysis and Stress Distributionmentioning

confidence: 63%

Local Ratcheting at the Notch Region of Non-Press-Fitted and Press-Fitted Al 7075-T6 Samples Undergoing Asymmetric Stress Cycles

Hatami,

Varvani-Farahani

2023

Metals

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“…Therefore, the yield force was evaluated as the point at which the mesh element reached 1125.0 MPa. To evaluate the effect of edgeless lattice structures on stress concentration reduction, the number of meshes subjected to stress ranging from 1012.5 MPa to 1125.0 MPa, corresponding to the top 10% of the von Mises stress distribution, were analyzed [ 46 ]. This number is referred to as the “Number of meshes in the top 10% stress range”.…”

Section: Methodologiesmentioning

confidence: 99%

Design Optimization of Additive Manufactured Edgeless Simple Cubic Lattice Structures under Compression

Park

Roh

2023

Materials

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This study proposed an optimization framework and methodologies to design edgeless lattice structures featuring fillet and multipipe functions. Conventional lattice structures typically experience stress concentration at the sharp edges of strut joints, resulting in reduced mechanical performance and premature failure. The proposed approach aimed to improve the compression behavior of lattice structures by introducing edgeless features. Through finite element analysis, the optimized fillet edgeless simple cubic unit cell with a fillet radius to strut radius ratio of 0.753 showed a 12.1% improvement in yield stress and a 144% reduction in stress concentration. To validate the finite element analysis, experimental compressive tests were conducted, confirming that the introduction of edgeless functions improved the compressive strength of lattice structures manufactured through additive manufacturing. The optimized fillet edgeless simple cubic lattice structure exhibited the most effective improvement. This approach has promising potential for lattice structure applications.

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“…Nowadays, the value of the Poisson ratio can be obtained by measuring deformations in general by any known measurement method-resistive strain gauges, optical FBG sensors, ESPI optical interferometry, the DIC optical digital image correlation method, etc. [8,9]. For the experimental determination of the Poisson ratio value, biaxial extensometers, based on the use of resistive strain gauges, are currently the most commonly used [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Poisson’s Ratio of Selected Metallic Materials in the Elastic–Plastic Region

Chmelko,

Koščo,

Šulko

et al. 2024

Metals

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Poisson’s ratio is one of the fundamental characteristics in the material models that are used. In engineering practice, its values are assumed to be constant in the elastic and in the plastic region. In this paper, the conventionally used values of this number for steel materials and aluminum alloys are confronted with experimental results. By using non-contact strain measurements with the DIC (digital image correlation) method, the evolution of the Poisson ratio value in the regions of transition from the elastic to the plastic region as well as in the regions of large plastic deformations was documented. The obtained experimental results are graphically compared using the proposed strain scaling. The gradient of the Poisson ratio changes in the vicinity of the yield stress is significant, indicating the need for a refinement of the material models in this region. Deviations from the conventionally used value of this number were found in the large plastic deformation region. In conclusion, a possible approach for improving the accuracy of simulations in FEM softwares was formulated.

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Simulation of Stress Concentrations in Notches

Cited by 14 publications

References 16 publications

Local Ratcheting at the Notch Region of Non-Press-Fitted and Press-Fitted Al 7075-T6 Samples Undergoing Asymmetric Stress Cycles

Local Ratcheting at the Notch Region of Non-Press-Fitted and Press-Fitted Al 7075-T6 Samples Undergoing Asymmetric Stress Cycles

Design Optimization of Additive Manufactured Edgeless Simple Cubic Lattice Structures under Compression

Poisson’s Ratio of Selected Metallic Materials in the Elastic–Plastic Region

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