Optimization of test specimen dimensions for thermal power station exposure device

Chvostová, Eva; Horvath, Jürgen; Konopík, Pavel; Rzepa, Sylwia; Melzer, Daniel

doi:10.1088/1757-899x/723/1/012009

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…The usability of the MTT technique to assess the mechanical properties of various structure states was previously demonstrated for conventionally and additively processed materials by Chvostova et al [40], Gotterbarm et al, and Džugan et al [43]. The application of MTT specimens was also presented by Melzer et al In this study, the sub-sized specimens were employed in order to investigate local mechanical properties of the interface of two different materials in a functionally graded block providing a deep insight into the location-and orientation-related properties [44]. The MTT was performed following the internal methodology RD 2/30 (accredited) according to the standard DIN EN ISO 6892-1/ASTM E8 [42].…”

Section: Small Samples Design Testing Device and Strain Measurementmentioning

confidence: 85%

Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

et al. 2022

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Additive manufacturing (AM) becomes a more and more standard process in different fields of industry. There is still only limited knowledge of the relationship between measured material data and the overall behaviour of directed energy deposition (DED)-processed complex structures. The understanding of the structural performance, including flow curves and local damage properties of additively manufactured parts by DED, becomes increasingly important. DED can be used for creating functional surfaces, component repairing using multiple powder feeders, and creating a heterogeneous structure with defined chemical composition. For thin parts that are used with the as-deposited surface, this evaluation is even highly crucial. The main goal of the study was to predict the behaviour of thin-walled structures manufactured by the DED process under static loading by finite element analysis (FEA). Moreover, in this study, the mechanical performance of partly machined and fully machined miniaturized samples produced from the structure was compared. The structure studied in this research resembles a honeycomb shape made of austenitic stainless steel AISI 316L, which is characterized by high strength and ductility. The uncoupled damage models based on a hybrid experimental-numerical approach were used. The microstructure and hardness were examined to comprehend the structural behaviour.

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Section: Small Samples Design Testing Device and Strain Measurementmentioning

confidence: 85%

Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

et al. 2022

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“…The tensile properties were investigated by miniaturized tensile test (MTT) [ 36 , 37 ]. The testing specimens were extracted from the additively manufactured part by a wire electric discharge machine (WEDM), in accordance with the geometrical dimensions depicted in Figure 9 a.…”

Section: Resultsmentioning

confidence: 99%

Heat Source Modeling and Residual Stress Analysis for Metal Directed Energy Deposition Additive Manufacturing

et al. 2022

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The advancement in additive manufacturing encourages the development of simplified tools for deep and swift research of the technology. Several approaches were developed to reduce the complexity of multi-track modeling for additive manufacturing. In the present work, a simple heat source model called concentrated heat source was evaluated for single- and multi-track deposition for directed energy deposition. The concentrated heat source model was compared with the widely accepted Goldak heat source model. The concentrated heat source does not require melt pool dimension measurement for thermal model simulation. Thus, it reduces the considerable time for preprocessing. The shape of the melt pool and temperature contour around the heat source was analyzed for single-track deposition. A good agreement was noticed for the concentrated heat source model melt pool, with an experimentally determined melt pool, using an optical microscope. Two heat source models were applied to multi-track 3D solid structure thermo-mechanical simulation. The results of the two models, for thermal history and residual stress, were compared with experimentally determined data. A good agreement was found for both models. The concentrated heat source model reported less than the half the computational time required for the Goldak model. The validated model, for 3D solid structure thermo-mechanical simulation, was used to analyze thermal stress evolution during the deposition process. The material deposition on the base plate at room temperature results in lower peak temperatures in the layers near the base plate. Consequently, the higher thermal stress in the layers near the base plate was found, compared to the upper layers during the deposition process.

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“…Specimens outline and cutting scheme within the extracted piece of material can be seen in Figure 5 a). For 10Cr-3W-3Co-1Mo material, test specimens with a diameter of two millimeters [5] were used. Both dimensions are based on the shape of the sample with dimensions of 20x20x4 mm, that can be extracted from real in service components by semi-destructive device EDSE (the Electric Discharge Sampling Equipment).…”

Section: Materials Sampling and Sub-size Specimensmentioning

confidence: 99%

Methodology for investigation of Creep Properties using Sub-size Specimen

CHVOSTOVÁ,

KONOPÍK

2023

METAL Conference Proeedings

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One of the methods of evaluating the mechanical properties of a material in the case of its limited amount l is the use of techniques that employ the miniaturized test specimens. The basic properties used mostly for residual life evaluation are tensile strength, impact notch toughness or impact notch toughness transition curve, fracture toughness, creep and high cycle fatigue. This paper investigates the creep properties using sub-size specimens with a cross section 2x1mm. The methodology of the creep properties evaluation is presented. Materials manufactured using laser-directed energy deposition process Inconel 718, and 10Cr-3W-3Co-1Mo creep-resistant steel without nitrogen content were tested at a temperature of 650 °C.

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Optimization of test specimen dimensions for thermal power station exposure device

Cited by 7 publications

References 9 publications

Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

Prediction of Behaviour of Thin-Walled DED-Processed Structure: Experimental-Numerical Approach

Heat Source Modeling and Residual Stress Analysis for Metal Directed Energy Deposition Additive Manufacturing

Methodology for investigation of Creep Properties using Sub-size Specimen

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