Stress-Strain Response Determination during Incremental Step Tests and Variable Loadings on Flat Specimens

Šeruga, Domen; Nagode, Marko; Klemenc, Jernej

doi:10.3390/technologies7030053

Cited by 4 publications

(3 citation statements)

References 16 publications

(18 reference statements)

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“…The force was measured with a 100-kN tensile-compressive load cell that is integrated into the testing machine. An in-house-developed guiding device was used to prevent any buckling of the specimens [37,38]. The experimental arrangement is presented in Figure 7.…”

Section: Experimental Datamentioning

confidence: 99%

Comprehensive Modelling of the Hysteresis Loops and Strain–Energy Density for Low-Cycle Fatigue-Life Predictions of the AZ31 Magnesium Alloy

et al. 2019

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Magnesium is one of the lightest metals for structural components. It has been used for producing various lightweight cast components, but the application of magnesium sheet plates is less widespread. There are two reasons for this: (i) its poor formability at ambient temperatures; and (ii) insufficient data on its durability, especially for dynamic loading. In this article, an innovative approach to predicting the fatigue life of the AZ31 magnesium alloy is presented. It is based on an energy approach that links the strain–energy density with the fatigue life. The core of the presented methodology is a comprehensive new model for tensile and compressive loading paths, which makes it possible to calculate the strain–energy density of closed hysteresis loops. The model is universal for arbitrary strain amplitudes. The material parameters are determined from several low-cycle fatigue tests. The presented approach was validated with examples of variable strain histories.

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Section: Experimental Datamentioning

confidence: 99%

Comprehensive Modelling of the Hysteresis Loops and Strain–Energy Density for Low-Cycle Fatigue-Life Predictions of the AZ31 Magnesium Alloy

et al. 2019

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“…The force was measured using a 100‐kN tensile‐compressive load cell that is integrated into the test rig. An in‐house‐developed antibuckling support was used to prevent any buckling of the specimens 37,38 (Figure 2B). Two constant temperature histories were considered during the study: −25°C and 150°C.…”

Section: Methodsmentioning

confidence: 99%

Determination of Stress–Strain Behaviour of Magnesium Alloy AZ31 under Variable Thermomechanical Loading

Šeruga

Bešter

Nagode

et al. 2021

Fatigue Fract Eng Mater Struct

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Growing environmental demands and higher fuel efficiency encourage the use of new light‐weight load‐bearing materials even for operation under rougher environmental conditions. Consequently, as the materials used in the vital load‐bearing components of the chassis, brake system or exhaust system are subjected to thermomechanical fatigue during the operation due to variable mechanical and thermal loads, it is crucial for design engineers and CAE analysts to understand the cyclic behaviour of new materials under such conditions. Here we have analysed the stress–strain behaviour of magnesium alloy AZ31 and the influence of variable thermomechanical loads. A uniaxially loaded flat specimen has been first mechanically loaded at −25°C. The temperature was then increased to 150°C whilst the variable mechanical loading remained unchanged. The tests have been strain‐controlled using a video extensometer. The stress–strain behaviour of the magnesium alloy AZ31 has been then investigated considering both variable temperature and variable mechanical load.

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“…The compressor has a maximum operating pressure limit up to 10 bar, and compressed air can be stored in the receiver tank of 6 L to ensure the continuous airflow through the piping. To boost the precise control over the readings, incremental step of the pressure used is 0.25 bar [43,44]. With the help of the pressure control valve and pressure regulator, steady pressure can be achieved in Fig.…”

Section: Experimental Methodsmentioning

confidence: 99%

Parametric design analysis of meridional deflection stresses in metal expansion bellows using gray relational grade

Pagar

Gawande

2020

J Braz. Soc. Mech. Sci. Eng.

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Unpredictable and uncertain failure of the bellows needs the attention of the designer toward maximum meridional deflection stresses generated on the U-shaped convolutions. Evaluation of these maximum stress points on the flexible convolutions is multifaceted. This paper deals with the identification of these stresses induced on the bellows convolutions by analytical and experimental methods. Further, the influence of the pivotal design parameters on meridional deflection stresses is studied mainly in two aspects: (1) effect of number of convolutions (N) and pitch diameter (d p) on the meridional deflection stresses and (2) the determination of the optimized design parameters to reduce the stress levels using effective multi-response gray relational grade (GRG) optimization technique. Three bellows of stainless steel material (Grade SS321) are used for the experimentation with a different number of convolutions (N) and pitch diameters (d p). The optimal design parameter setting is found by using GRG analysis through ANOVA and regression mathematical model. The effect of design factors on GRG is analyzed. Besides, using GRG, the regression model enhances to give alternative optimal solutions; in turn, it increases the designer's choice for the selection of the parametric levels. In the confirmation test, it is seen that the average improvement in GRG for all selected Taguchi orthogonal runs is 23%.

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Stress-Strain Response Determination during Incremental Step Tests and Variable Loadings on Flat Specimens

Cited by 4 publications

References 16 publications

Comprehensive Modelling of the Hysteresis Loops and Strain–Energy Density for Low-Cycle Fatigue-Life Predictions of the AZ31 Magnesium Alloy

Comprehensive Modelling of the Hysteresis Loops and Strain–Energy Density for Low-Cycle Fatigue-Life Predictions of the AZ31 Magnesium Alloy

Determination of Stress–Strain Behaviour of Magnesium Alloy AZ31 under Variable Thermomechanical Loading

Parametric design analysis of meridional deflection stresses in metal expansion bellows using gray relational grade

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