Plastic stress concentration effects in fatigue strength

Liu, Mengen; Miranda, Antônio Carlos de; Antunes, Marcelo Avelar; Meggiolaro, Marco Antônio; Castro, Jaime Tupiassú Pinho de

doi:10.1016/j.ijfatigue.2022.107394

Cited by 4 publications

(1 citation statement)

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“…Numerous theories and methods have been developed to analyse the fatigue notch effect by using the concept of stress gradient [28,29]. Nonetheless, obtaining the necessary data, such as fatigue threshold and fatigue limit, to input into these models remains time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Fatigue Notch Sensitivity of High-Strength Steels through Fracture Toughness

Parareda

Frómeta

Casellas

et al. 2023

Metals

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This study presents an innovative approach for selecting high-strength materials for fatigue dimensioning parts, considering both fracture toughness and fatigue performance. Warm and hot forming processes enable the construction of high-strength parts above 1000 MPa with complex geometries, making them suitable for lightweight chassis in automotive and freight applications. This research reveals that high-strength steels can experience up to a 40% reduction in fatigue performance due to manufacturing defects introduced during punching and trimming. Fracture toughness has been proposed as a good indicator of notch sensitivity, with a strong correlation of 0.83 between fracture toughness and fatigue notch sensitivity. Therefore, by combining fracture toughness measurements and fatigue resistance obtained through the rapid fatigue test, it becomes possible to quickly identify the most fatigue-resistant materials to deal with defects. Among the nine materials analysed, warm-formed steels show promising characteristics for lightweight chassis construction, with high fatigue resistance and fracture toughness exceeding the proposed fracture threshold of 250 kJ/m2.

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Section: Introductionmentioning

confidence: 99%