Force attenuation properties of shear-thickening polymer (STP)-based hip protector in simulated sideways fall

Yum, Haeun; Kim, Yeonha; Kim, Bobae; Lee, Yeokyeong; Lee, Taeyong

doi:10.1007/s12206-020-1135-y

Cited by 4 publications

(4 citation statements)

References 36 publications

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“…However, under high shear rates, hydroclusters are formed and STP becomes macroscopically rigid, which improves the protection of the human body against external physical shocks as mechanical dampers. 29 Therefore, STP has gained considerable attention in protective applications like body armors 29,30 and hip protectors 21 to improve resistance against the impacts. To understand the characteristics or behaviors of STP and improve applications in STP-based hip protectors, this study investigated the effect of STP thickness in the hip protectors composed of STP and polyurethane foam.…”

Section: Discussionmentioning

confidence: 99%

“…We evaluated the force attenuation capacity of the hip protectors under the same conditions as the previous study by Yum et al 21 We used a drop weight impact testing system mounted with a hip model and an embedded load sensor in the femoral neck of the hip model.…”

Section: Methodsmentioning

confidence: 99%

“…In a previous study, Yum et al 21 developed an STP-based hip protector which can utilize the protective performance of STP; it enhances the energy dissipation. There are some types of dispersed phase particles in STP systems and the main base of the STP used was cornstarch.…”

Section: Introductionmentioning

confidence: 99%

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Effects of shear-thickening polymer on force attenuation capacities in hip protectors

Yum

Lim

Min

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Many elderly people use hip protectors to prevent hip fractures from sideways falls. These hip protectors absorb or shunt away the energy applied to the greater trochanter. Herein, shear-thickening polymer (STP)-based hip protectors composed of STP and polyurethane foam are studied. The purpose of this study was to identify the main factor that reduces the impact force directly applied to the femoral neck region and to determine the optimal thickness of STP in hip protectors. Seven hip protectors of different thicknesses were prepared, and two sets of free-fall mechanical tests with a low impact energy of 25.1 J and moderate impact energy of 44.1 J were conducted for each hip protector. When the thickness of STP exceeded 8 mm, the resultant peak force tended to plateau under both impact conditions, and the force attenuation capacity decreased even under low impact energy conditions. Thus, a hip protector with a 6 mm or 8 mm STP and 5 mm foam was recommended. The STP was the key factor affecting force attenuation capacity, not the polyurethane foam. However, the foam also played an important role in helping the STP function and improving compliance for users.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Effects of shear-thickening polymer on force attenuation capacities in hip protectors

Yum

Lim

Min

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Impact resistance of the composite based on STF rheological properties has been conducted variously so far, for example, microcapsule structure, 85,86 honeycomb skeleton structure, 87 lattice sandwich structure, [88][89][90] fabric structure, 68,91 cork structure, 92,93 and PU foam structure. 81,94,95 Hence, the impact behaviors of STFCs are significantly affected by many factors in fabric reinforcement, which deserve more attention and are highlighted in this section.…”

Section: Influencing Factors Of Fabric Reinforcementmentioning

confidence: 99%

Shear thickening fabric composites for impact protection: a review

Tan

2022

Textile Research Journal

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Fabrics with proper mechanical properties and high structural designability are frequently selected as the reinforcement of flexible composites. Shear thickening materials (STMs), including shear thickening fluid and shear thickening gel, are dense colloidal suspensions exhibiting an abrupt increase in viscosity with increasing shear rate. Shear thickening fabric composites (STFCs) which combined STM with fabrics, have been increasingly in demand for impact protective applications due to their tremendous potential. Herein, the characteristics of STM and the effects of fabric reinforcement on STFC impact behaviors are discussed for optimizing their properties and structures. Subsequently, the impact behaviors of STFCs obtained by multiple testing approaches with different impact threats are reviewed systematically. Furthermore, a comprehensive summary of the existing literature on stab, drop-weight, split Hopkinson pressure bar, and ballistic impact protective mechanisms of STFCs is presented. It is found that based on the proper selection of STM types, thorough mechanistic explanations of STFC impact behaviors are instructive and could facilitate the development of wearable protective equipment. The purpose of this critical review is to provide a framework for comparison of the effective impact resistances of STFCs across many applications and to discuss issues for future research.

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Improvement of spall liner performance with smart fluid applications

Gürgen

Kuşhan²

2022

Thin-Walled Structures

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Force attenuation properties of shear-thickening polymer (STP)-based hip protector in simulated sideways fall

Cited by 4 publications

References 36 publications

Effects of shear-thickening polymer on force attenuation capacities in hip protectors

Effects of shear-thickening polymer on force attenuation capacities in hip protectors

Shear thickening fabric composites for impact protection: a review

Improvement of spall liner performance with smart fluid applications

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