Fatigue life prediction of steel bridge connections using fracture mechanics models

Abdulla, Warda; Menzemer, Craig C.

doi:10.17515/resm2021.264st0310

Cited by 2 publications

(4 citation statements)

References 14 publications

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“…Controlling die failure mechanisms, such as thermal fatigue and surface wear, is essential for achieving economically viable tool longevity. Additional load effects may also be caused by fatigue damage [1]. 70% of diecasting die failures are caused by thermal fatigue, one of the several failure modes.…”

Section: Introductionmentioning

confidence: 99%

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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%

“…The kinetics of crack formation can be represented by a variety of models. [1]. Compared to other steels in its class, AISI H13 is a hot work tool steel containing 5% chromium and a higher than average amount of vanadium By virtue of its high hardenability, material chemical composition presented in Table .1 [3.4].…”

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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show abstract

Section: Introductionmentioning

confidence: 99%

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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Fatigue life prediction of steel bridge connections using fracture mechanics models

Cited by 2 publications

References 14 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

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