Contribution in the evaluation of a performance index of hot forging dies

Bendjoudi, Youcef; Becker, Eric; Bigot, Régis; Amirat, Abdelaziz

doi:10.1007/s00170-016-8829-4

Cited by 11 publications

(3 citation statements)

References 25 publications

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“…Its resistance to thermal fatigue cracking, a result of repeated heating and cooling cycles in hot working setups, is attributed to its hot hardness, which is synonymous with hot strength [7]. The value of the first effective strain, which is a critical parameter that requires careful evaluation, is closely related to the effect of temperature on die life [8]. The most pronounced die wear occurs near the die bearing, posing a higher risk of die failure due to significant plastic deformation, elevated die temperature, and interface pressure [9].…”

Section: Introductionmentioning

confidence: 99%

Reliability approach for lifetime prediction of the aluminum extrusion dies

Hadji,

Benamira,

Khelif

2024

Res. Eng. Struct. Mat.

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This paper introduces a probabilistic approach for predicting the lifetime of extrusion dies using a structural reliability method known as stress-strength interference. In our investigation, we have integrated the assessment of the die's cycle life by following behavioral and rheological law. The approach relies on estimating the reliability index through a combination of a behavioral model and a reliability analysis of the hot extrusion process. Subsequently, the reliability analysis is conducted using a mechanical model to depict the most likely failure conditions. In this regard, the rheological law of Hansel & Spittel emerges as the most suitable choice, as it incorporates the mechanical properties of the materials employed in the fabrication of hot tools. The proposed mechano-reliability approach enables us to estimate reliability and its sensitivity by adjusting the parameters controlling the input process in die formation. Numerous scenarios involving extrusion dies were considered. The results demonstrate that temperature's impact on the die during the extrusion process is manifested through fatigue and damage parameters, as well as the first equivalent strain, which affect the evolution of the reliability index β and subsequently enhance the number of billets extruded.

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Section: Introductionmentioning

confidence: 99%

Reliability approach for lifetime prediction of the aluminum extrusion dies

Hadji,

Benamira,

Khelif

2024

Res. Eng. Struct. Mat.

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Section: Introductionmentioning

confidence: 99%

Internal force transfer in segmental RC structures

Bashirzade,

Ozcan,

Cagdas

2024

Res. Eng. Struct. Mat.

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The primary objective of this numerical study is to provide a finite element (FE) analysis approach for segmental structures. The study was conducted using a hollow circular segmental structure model capable of adequately imitating real structural behavior and deals with the effect of varying number of segments on structural performance. In order to verify the FE procedure conducted by DIANA software, comparisons are made with the acquired numerical results and the results taken from previous experimental studies for 1 reinforced concrete (RC) beam, 2 post-tensioned (PT) beam, and 3 segmental post-tensioned beams (SPT). For the considered cases, 1D line, 2D shell, and 3D solid FE models are made, and it is found out that the 3D solid model with interface elements yields the most plausible results. Further, the FE model was constructed to accurately predict segment joint behavior concerning the relationship between the number of segments, concrete compressive strength, and the width of the openings at the segment joints up to collapse. In this study, a hollow circular segmental structure model is utilized to mimic real structural behavior, presenting a novel perspective on internal force transfer mechanisms within segmental structures. Moreover, the FE model is tailored to accurately predict segment joint behavior, elucidating the intricate relationship between the number of segments, concrete compressive strength, and the width of openings at segment joints up to collapse. In addition to presenting a robust numerical analysis framework, this study contributes novel insights into the complex interplay between segmental geometry, material properties, and structural behavior, thus advancing the state-of-the-art in segmental structural design. Thus, a modular construction methodology is proposed for segmental beam type structures ensuring safety, efficiency, and flexibility in challenging load conditions.

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“…Therefore, in the technical literature, the issue of exploitation is devoted to a lot of space and a number of studies are carried out to determine the relevant parameters affecting this phenomenon, as well as industrial research and development works that allow to increase the service life [20,25,29]. In the case of the forging industry, despite the large development in this area of technology, so that the production process is accurate, reliable and efficient [5], the durability of the tooling is still the key issue, ie the operation time is usually determined by the number of correct forgings produced. As is known, the time of the process of forming (forging) material in one stage / operation is about 0.08 to 0.2 s, which makes it very difficult to follow or observe and analyze the process in such a short period of time [34].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the impact of forging and trimming tools wear on the dimension-shape precision of forgings obtained in the process of manufacturing components for the automotive industry

Hawryluk¹,

Kondracki²,

Krawczyk³

et al. 2019

Eksploatacja i Niezawodność – Maintenance and Reliability

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Article citation info: (*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl HAWRYLUK M, KONDRACKI P, KRAWCZYK J, RYCHLIK M, ZIEMBA J. Analysis of the impact of forging and trimming tools wear on the dimension-shape precision of forgings obtained in the process of manufacturing components for the automotive industry. Eksploatacja i

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Contribution in the evaluation of a performance index of hot forging dies

Cited by 11 publications

References 25 publications

Reliability approach for lifetime prediction of the aluminum extrusion dies

Reliability approach for lifetime prediction of the aluminum extrusion dies

Internal force transfer in segmental RC structures

Analysis of the impact of forging and trimming tools wear on the dimension-shape precision of forgings obtained in the process of manufacturing components for the automotive industry

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