New Materials Technology for Achieving Both Crashworthiness and Weight Reduction Using Energy-Absorbing Steel with Higher Strain-Rate Sensitivity

Nakanishi, Eizaburo; Tateno, Hideyuki; Hishida, Yuji; Shibata, K.

doi:10.4271/980953

Cited by 8 publications

(2 citation statements)

References 2 publications

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“…Several recent studies have evaluated the mechanical properties of selected TRIP steels with laboratory tensile tests or component crush tests. [8][9][10] In this study two low carbon steels were chosen, based on previous results, [11][12][13][14] to allow systematic assessment of the effects of retained austenite and carbon content on the high strain rate behavior of TRIP steels.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behavior of Low Carbon TRIP Sheet Steels at High Strain Rates.

et al. 2002

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Two high strength transformation-induced plasticity (TRIP) sheet steels with 0.10 wt% and 0.14 wt% carbon were produced with retained austenite volume fractions varying from less than 3 % up to 16 %. These TRIP steels were tensile tested at strain rates ranging from 10 Ϫ3 to 2.5ϫ10 2 s Ϫ1 to determine the effects of strain rate and retained austenite volume fraction on tensile properties. Increasing the retained austenite volume fraction increases UTS, total elongation, uniform strain and total absorbed energy, but decreases yield strength and absorbed energy below 10 % engineering strain. Increasing strain rate increases yield strength and UTS, and creates a better-defined yield point, but has little effect on strain hardening behavior for TRIP steels with 11 % or less retained austenite. The TRIP steel with 16 % retained austenite shows increasing strain hardening rate with strain rate at low strains.KEY WORDS: high speed deformation; strain rate sensitivity; absorbed energy; strain hardening; TRIP steels; retained austenite. Table 1. Chemical compositions (wt%) and critical temperatures (°C) for the TRIP steels studied.

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Section: Introductionmentioning

confidence: 99%

Deformation Behavior of Low Carbon TRIP Sheet Steels at High Strain Rates.

et al. 2002

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“…Toecaps are widely used elements of protective footwear that should be designed to meet the requirements of the EU's Regulation 2016/425 on personal protective equipment [1]. A defining property of toecaps is impact resistance [2], which is evaluated in accordance with the EN 22568 standard [3]. The toecaps applied in protective footwear are usually made of aluminum or high-strength steel [4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Impact Resistance of Toecaps by the Finite Element Method: Preliminary Studies

Kropidłowska

Irzmańska

Gołębiowski

et al. 2022

IJERPH

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A key property in the manufacture of toecaps for protective footwear is resistance to impacts, deformations, and cracking, as the resulting defects may lead to serious workplace accidents involving the lower extremities. The present paper proposes a new approach to qualitative verification of toecap design based on numerical simulations of impact tests. Computational experiments were conducted for toecaps made from different materials (AISI 10450, S235, S355 and A36 steels, as well as Lexan polycarbonate) and characterized by different geometries, which were recreated by 3D scanning. The impact resistance of the toecaps was analyzed using a numerical model simulating an experimental impact test. The results were used to determine the location of critical stresses and to plot equivalent stress maps for the studied toecaps. The finite element analysis of the impact tests was carried out with an explicit elastoplastic finite element code: ANSYS (Ansys, Inc., Canonsburg, PA, USA) with the Explicit Dynamics module of the Workbench solver. The presented analysis of the impact resistance of toecaps by the finite element method for impact simulation may be used to optimize the spatial geometry of toecaps and to verify the construction of toecaps and the material deformations that may occur. In addition, it could eliminate unsuitable materials that are likely to undergo dangerous deformations, and draw attention to the deformation caused by the impact of the toecaps used in footwear in the working environment.

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