FE Simulations of Piercing and Trimming of AL and AHSS Alloys

Diaz-Infante, David; Narayanan, A.; Groseclose, Adam; Altan, Taylan

doi:10.1007/978-3-030-75381-8_243

Cited by 1 publication

(1 citation statement)

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“…In chassis parts, these surface irregularities are often introduced in the sheet shearing process (trimming, punching, etc.). It has been shown that the sheared edge morphology depends on various factors, including the material, punch geometry, shearing clearance, and tool wear [9,10]. Some strategies have been developed to overcome such problems.…”

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%