Calibration and validation of three fracture criteria for alloy 718 subjected to high strain rates and elevated temperatures

Sjöberg, Ted; Kajberg, Jörgen; Oldenburg, Mats

doi:10.1016/j.euromechsol.2018.03.010

Cited by 14 publications

(4 citation statements)

References 27 publications

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“…Digital image correlation (DIC), or Particle Image Velocimetry (PIV), has since its introduction in the 1980s evolved into one of the most versatile and widespread techniques in experimental mechanics [1][2][3][4][5][6]. Recent examples are found in diverse scientific fields such as biomechanics [7], infrastructure [8], material science [9], composite structures [10], and microfluidistics [11], but the technique is not restricted to these scientific fields. A quick search on a popular search engine lists over 50,000 contributions out of which 16,000 are published throughout the last four years.…”

Section: Introductionmentioning

confidence: 99%

Gradient Correlation Functions in Digital Image Correlation

Sjödahl

2019

Applied Sciences

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The performance of seven different correlation functions applied in Digital Image Correlation has been investigated using simulated and experimentally acquired laser speckle patterns. The correlation functions were constructed as combinations of the pure intensity correlation function, the gradient correlation function and the Hessian correlation function, respectively. It was found that the correlation function that was constructed as the product of all three pure correlation functions performed best for the small speckle sizes and large correlation values, respectively. The difference between the different functions disappeared as the speckle size increased and the correlation value dropped. On average, the random error of the combined correlation function was half that of the traditional intensity correlation function within the optimum region.

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Section: Introductionmentioning

confidence: 99%

Gradient Correlation Functions in Digital Image Correlation

Sjödahl

2019

Applied Sciences

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“…These triaxiality values should be seen as average values since the notched specimens especially tend to drift towards plane strain territory close to fracture. The gauge area of these geometries can be seen (in order from left to right) in Figure 2 with full geometries presented in previously published papers [24,33]. These tests were only performed for high strain rates and not quasi-static conditions since higher strain rates dominate in typical crash situations.…”

Section: Tensile Testingmentioning

confidence: 99%

“…The method works for different stress states and gives the evolution of the triaxiality as a function of the equivalent plastic strain. SMM has been successfully used to characterise the hardening behaviour [21] and to calibrate different fracture loci [24].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Crashworthiness Using High-Speed Imaging, 3D Digital Image Correlation, and Finite Element Analysis

Jonsson,

Kajberg

2023

Metals

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To promote the use of newhigh-strengthmaterials in the automotive industry, the evaluation of crashworthiness is essential, both in terms of finite element (FE) analysis aswell as validation experiments. Thiswork proposes an approach to address the crash performance through high-speed imaging combined with 3D digital image correlation (3D-DIC). By tracking the deformation of the component continuously, cracks can be identified and coupled to the load and intrusion history of the experiment. The so-called crash index (CI) and its decreasing rate (CIDR) can then be estimated using only one single (or a few) component, instead of a set of components with different levels of intrusion and crushing. Crash boxes were axially and dynamically compressed to evaluate the crashworthiness of TRIP-aided bainite ferrite steel and press-hardenable steel. Acalibrated rate-dependent constitutivemodel, and a phenomenological damage model were used to simulate the crash box testing. The absorbed energy, the plastic deformation, and the CIDR were evaluated and compared to the experimentally counterparts. When applying the proposed method to evaluate the CIDR, a good agreement was found when using CI:s reported by other authors using large sets of crash boxes. The FE analyses showed a fairly good agreement with some underestimation in terms of energy absorptions. The crack formation was overestimated resulting in too high a predicted CIDR. It is concluded that the proposed method to evaluate the crashworthiness is promising. To improve the modelling accuracy, better prediction of the crack formation is needed and the introduction of the intrinsic material property, fracture toughness, is suggested for future investigations and model improvements.

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“…Both models are extensively used in the metal forming process. The modified Mohr-Coulomb model Sjöberg et al (2018) was also used to characterize the fracture behavior of Inconel 718 at elevated temperatures. The tensile test performed at various temperatures showed that the strains of this model agree well with the experimental data of Inconel 718.…”

Section: Introductionmentioning

confidence: 99%

Accurate Prediction of Residual Stresses in Machining of Inconel 718 Alloy through Crystal Plasticity Modelling

Kesriklioglu

Kapci

BUYUKCAPAR

et al. 2023

Afyon Kocatepe University Journal of Sciences and Engineering

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This study presents the dynamic and buckling analysis of the laminated composite thin arch plate frame structures employing Classical Plate Theory with Finite Element Analysis. For this purpose, the effects of the radius of curvature, aspect ratio, and stacking order of such structures on the first ten natural frequencies, mode shapes, critical buckling load, and the first unstable regions are investigated. Besides, the two-bay curved plate frame structure is investigated. In order to perform dynamic and buckling analyses, a computer code is developed and executed via MATLAB. The results are compared and validated with those of ANSYS. It is concluded that the aspect ratio or the stacking order affects the dynamic characteristics of the curved plate frame structure considerably while the radius of curvature relatively has less impact on such dynamic properties of the structure.

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Calibration and validation of three fracture criteria for alloy 718 subjected to high strain rates and elevated temperatures

Cited by 14 publications

References 27 publications

Gradient Correlation Functions in Digital Image Correlation

Gradient Correlation Functions in Digital Image Correlation

Evaluation of Crashworthiness Using High-Speed Imaging, 3D Digital Image Correlation, and Finite Element Analysis

Accurate Prediction of Residual Stresses in Machining of Inconel 718 Alloy through Crystal Plasticity Modelling

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