Evaluation of the Low-Cycle Fatigue Life in Seven Steel Bar Types

Hawileh, Rami A.; Tabatabai, Habib; Abu-Obeidah, Adi; Balloni, J.; Rahman, Adeeb

doi:10.1061/(asce)mt.1943-5533.0001476

Cited by 11 publications

(6 citation statements)

References 9 publications

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“…On the other hand, the model proposed by Mander et al [1] best represented the experimental results when only the plastic strain amplitude was considered. Hawileh et al [20] conducted LCF experimental tests on seven steel bars types. Correlations between fatigue life and chemical composition were assessed.…”

Section: Low-cycle Fatigue Modelsmentioning

confidence: 99%

Strain-ageing effects on the residual low-cycle fatigue life of low-carbon steel reinforcement

et al. 2022

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Low-cycle fatigue (LCF) failures can be expected when rebars are subjected to a small number of cycles at large stress/strain amplitudes. Major seismic events are often preceded or followed by other events of smaller/larger magnitude. During each event, the residual fatigue life of the steel reinforcement may reduce, eventually leading to failure of the bars due to the cumulative damage. Strain ageing may reduce even more the residual fatigue life of steel. This paper presents the results of an experimental testing campaign conducted on samples fabricated from New Zealand Grade 300E steel. A benchmark LCF life was obtained for 12-mm steel reinforcing bars subjected to axial-strain-controlled completely reversed cyclic tests at amplitudes ranging between 0.78 and 2.75%. The reduction in fatigue life attributed to strain ageing was obtained by comparing the benchmark fatigue life with that of steel reinforcing bars precycled up to 33% and 66% of the benchmark life and artificially strain aged for an equivalent period of 1 year at 15 °C. The Coffin-Manson and Koh-Stephens models were employed to evaluate the experimental results. The study demonstrates that, depending on the strain amplitude, strain ageing can cause a reduction in total and residual fatigue life ranging from 20 to 70%. Strain ageing should not be ignored during the assessment of earthquake-damaged steel reinforcing bars.

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Section: Low-cycle Fatigue Modelsmentioning

confidence: 99%

Strain-ageing effects on the residual low-cycle fatigue life of low-carbon steel reinforcement

et al. 2022

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“…Choosing a material also a crucial thing needs to consider. Material selection could be the critical part that could affect the life cycle of a product [7]. Referring to the application and manufacturing process of the product, the most suitable material that can be used is ASTM A36 [8].…”

Section: Materials Selectionmentioning

confidence: 99%

Lifting Kit for Flooded Furnitures: Mechanical Design and Strength Analysis

Dzulkifly

Frandito

Ramadhani

et al. 2021

JMEM

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<p>Almost every year, floods disaster becomes the scourge of many countries in the world, including Indonesia. When the flood comes and submerges the houses, every item and household furniture in it will also be submerged in flood water. Furniture that is heavy and difficult to move, especially electronic equipment such as refrigerators, may be left by the owner when a flood occurs. To prevent the furniture from submerging, a lifting kit is needed. For this reason, the purpose of this work is to design a mechanical tool/kit that can lift or elevate the electronic furniture such as refrigerator to a higher position and avoid the damage caused by flood. The kit is expected to be able to cover a 100 x 80 cm base of the refrigerator with maximum load of 200 kg. The elevation of the lifting kit is set to be higher than 50 cm. Calculation for the stress and fatigue analysis is also performed to determine the strength of the structure. As a result, the obtained safety factors for the critical components under static and fatigue loading conditions show values of more than one, indicating the product is safe for real operation. In addition, the required torque to produce the elevation is also calculated and discussed.</p>

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“…Therefore, an investigation of the properties of seven-wire strands under lateral bending is conducted. The S-N curve is a typical method to reflect the fatigue properties of materials, so we decide to study the S-N curve of seven-wire strands under lateral bending [39][40][41].…”

Section: The Fatigue Properties Of Seven-wire Strands Under Lateral Bmentioning

confidence: 99%

A Study on the Strength and Fatigue Properties of Seven-Wire Strands in Hangers under Lateral Bending

2020

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Hangers are important tensile members in half-through arch bridges and through arch bridges (HTABs and TABs). The floating deck structures of HTABs and TABs will commonly produce longitudinal deformation and rotate under the effect of temperature and the temperature gradient, which will cause bending deformation at anchorages of fixed-end hangers. This bending deformation can generate adverse bending stress for hangers and decrease the strength and fatigue properties of the seven-wire strands in the hangers. Firstly, theoretical derivation and finite element analysis are conducted to study the bending stress of hangers that is caused by bending deformation. We find that bending stress of hangers is mainly generated by lateral bending caused by the difference in longitudinal displacement at both ends of the hangers under the effect of temperature. Subsequently, the ultimate tensile strength of the seven-wire strands under lateral bending is obtained by FEM and an experimental study. The ultimate tensile strength of the seven-wire strands could decrease by 23.3% when lateral bending is considered. Moreover, the relationship between the fatigue properties of the seven-wire strands and lateral bending is obtained based on observing the ultimate tensile strength under lateral bending. Lateral bending significantly influences the fatigue properties of the seven-wire strands. When the lateral bending angle reaches about 50 mrad, the fatigue resistance of the seven-wire strands drop by almost 40%. The considerable decrease in the strength and fatigue properties of the seven-wire strands indicates that lateral bending has a significant adverse influence on hangers that consist of seven-wire strands. Finally, it is advised to use the tied arch structure for HTABs and TABs to mitigate the adverse influence of lateral bending on hangers.

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Evaluation of the Low-Cycle Fatigue Life in Seven Steel Bar Types

Cited by 11 publications

References 9 publications

Strain-ageing effects on the residual low-cycle fatigue life of low-carbon steel reinforcement

Strain-ageing effects on the residual low-cycle fatigue life of low-carbon steel reinforcement

Lifting Kit for Flooded Furnitures: Mechanical Design and Strength Analysis

A Study on the Strength and Fatigue Properties of Seven-Wire Strands in Hangers under Lateral Bending

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