Evaluation of damage of polymeric toecaps used in protective footwear – case study

Kropidłowska, Paulina; Irzmańska, Emilia; Jurczyk-Kowalska, Magdalena

doi:10.14314/polimery.2019.7.8

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…Impact strength was measured using a universal tester (Pegasil, Portugal). The reference standard was PN-EN ISO 20344:2022-04 for measuring the impact strength of toe caps used in safety and protective footwear [ 18 , 19 ]. Due to the different purpose of the methods contained in the aforementioned standard, the experimental stand was modified to enable testing flat materials of different thicknesses with the characteristics described in this study.…”

Section: Methodsmentioning

confidence: 99%

An Approach to Testing Antivandal Composite Materials as a Function of Their Thickness and Striker Shape—A Case Study

Irzmańska,

Mizera,

Litwicka

et al. 2024

Polymers

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Our research material comprised antivandal fire-retardant hybrid composites modified with inorganic and organic fillers intended for application in public transport vehicles. This paper presents an approach to studying their impact strength as a function of the composite thickness (3 to 6 mm) and striker shape (hemispherical, semicylindrical, wedge-shaped) used in the experimental stand. Group A composites, made of single fabric layers (n = 5), were thinner and their impact strength was lower by 73% than that for Group B composites made of double fabric layers. Study results show an almost threefold improvement in impact strength for a thickness increase of as little as 0.3 mm. Statistical analysis (the Shapiro–Wilk test, p > 0.05) did not show any significant differences in the quantitative evaluation of changes (n = 3) on the surface of the examined materials caused by impacts with strikers of different shapes. In turn, a linear correlation (Shapiro-Wilk test, W = 0.0857, p = 0.022) was found between impact strength and the thickness of the studied materials. It was observed that appropriate arrangement of fabrics and powder fillers can lead to a different distribution of forces and energy absorbed by the tested material. A lower impact strength was observed for the composite which had powder fillers in its composition, which caused the formation of microvoids in the structure of the material and thus led to a weakening in their strength properties. An effect of the placement of the glass fabric layer in the composite on the results was also observed. Moreover, SEM evaluation of the composites revealed their layered structure and the impregnation of woven fabrics with resin.

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Section: Methodsmentioning

confidence: 99%

An Approach to Testing Antivandal Composite Materials as a Function of Their Thickness and Striker Shape—A Case Study

Irzmańska,

Mizera,

Litwicka

et al. 2024

Polymers

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Evaluation of the mechanical strength and protective properties of polycarbonate toecaps subjected to repeated impacts simulating workplace conditions

Kropidłowska

Irzmańska

Zgórniak

et al. 2020

International Journal of Occupational Safety and Ergonomics

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The objective of this work was to examine the mechanical strength properties of polycarbonate toecaps designed for commercially available protective footwear, subjected to repeated impacts simulating workplace conditions. The effects of impacts on the toecaps were expressed as the height of toecap clearance, which has a direct bearing on the safe use of protective footwear. Changes in toecap geometry were evaluated using an originally developed methodology taking into consideration the requirements of Standard No. EN ISO 22568-2:2019. Additionally, external and internal sides of toecaps were scanned in three dimensions after each impact and reverse engineering was used to analyze deformations in toecap geometry by comparing the shape of the toecaps before and after impact. Three-dimensional scanning made it possible to measure the remaining safe distance for toes between the footwear sole and the impacted toecap surface, which is an indicator of the protective properties and safety of toecaps during use.

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Mechanical Properties of Epoxy-Based Hybrid Composites Reinforced by Fabrics and Powder Fillers

Mizera

Sałasińska

Irzmańska

et al. 2023

MSF

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Different types of fabrics, such as aramid, carbon, basalt, glass, and flax, as well as powder fillers, were used to manufacture the epoxy-based hybrid composites by the vacuum bagging method. In this work, the resistance of hybrid composites was examined in terms of their resistance to acts of vandalism, such as resistance to cuts with sharp objects, impacts, and flames. These technics were applied to determine the impact of the type of fillers and fabrics on the performance of hybrid composites.

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Evaluation of damage of polymeric toecaps used in protective footwear – case study

Cited by 3 publications

References 13 publications

An Approach to Testing Antivandal Composite Materials as a Function of Their Thickness and Striker Shape—A Case Study

An Approach to Testing Antivandal Composite Materials as a Function of Their Thickness and Striker Shape—A Case Study

Evaluation of the mechanical strength and protective properties of polycarbonate toecaps subjected to repeated impacts simulating workplace conditions

Mechanical Properties of Epoxy-Based Hybrid Composites Reinforced by Fabrics and Powder Fillers

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