Experimental evaluation of protected and unprotected hands under impact loading

Sosa, Eduardo M.; Alessa, Faisal M.

doi:10.1016/j.jbiomech.2021.110326

Cited by 10 publications

(16 citation statements)

References 20 publications

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“…The bending sensor of the data glove is the basic equipment for collecting data. We mainly collect the voltage ADC data change caused by the resistance change of the collected bending sensor [ 11 , 12 , 17 – 19 ]. This study mainly uses a flexible bending sensor coated with graphene, a new material, as a data acquisition sensor.…”

Section: Methodsmentioning

confidence: 99%

Design and Manufacture of Data Gloves for Rehabilitation Training and Gesture Recognition Based on Flexible Sensors

Guo

Zhang

Zhao

et al. 2021

Journal of Healthcare Engineering

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This work takes the production and usage scenarios of the data glove as the research object and studies the method of applying the flexible sensor to the data glove. Many studies are also devoted to exploring the transplantation of flexible sensors to data gloves. However, this type of research still lacks the display of specific application scenarios such as gesture recognition or hand rehabilitation training. A small amount of experimental data and theoretical analysis are difficult to promote the development of flexible sensors and flexible data gloves design schemes. Therefore, this study uses the self-made flexible sensor of the research group as the core sensing unit to produce a flexible data glove to monitor the bending changes of the knuckles and then use it for simple gesture recognition and rehabilitation training.

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Section: Methodsmentioning

confidence: 99%

Design and Manufacture of Data Gloves for Rehabilitation Training and Gesture Recognition Based on Flexible Sensors

Guo

Zhang

Zhao

et al. 2021

Journal of Healthcare Engineering

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“…In the past years, experimental studies with cadaveric hands have been completed to measure the forces resulting from low-velocity impacts (typically ≤ 5 m/s) on different regions of the hand [ 5 , 6 , 7 ]. While those tests provide valuable information regarding the order of magnitude of the forces resulting from the impact, they can be limited by the number and variability of testing specimens prompting the development of surrogate hands that can closely mimic the impact behavior of real hands.…”

Section: Introductionmentioning

confidence: 99%

“…In that study, surrogate hands were built as a combination of synthetic gels representing the soft tissues as a whole and surrounding a 3D-printed bone structure and used to assess the impact protection of typical metacarpal gloves. The surrogate hand specimens (shown in Figure 1 ) were subjected to controlled impact tests, and their calibration and validation were based on impact response data reported previously for cadaveric hand specimens [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…This study presents a systematic evaluation of the mechanical response of synthetic gels to a series of quasi-static tests and controlled impact tests to determine their firmness, hardness, and reaction against low-velocity (~2 m/s) impacts. The experimental work performed on cadaveric specimens subjected to controlled impact tests was reported in [ 7 ] and served as the basis for the development and testing of surrogate hands reported in [ 27 ]. The synthetic gels evaluated in this study correspond to the material candidates considered for creating surrogate hands that can be used for systematic impact testing reported in [ 27 ].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical Characterization of Synthetic Gels for Creation of Surrogate Hands Subjected to Low-Velocity Impacts

Sosa

Moure

2022

Gels

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The development of human body simulators that can be used as surrogates for testing protective devices and measures requires selecting synthetic materials with mechanical properties closely representative of the human tissues under consideration. For impact tests, gelatinous materials are often used to represent the soft tissues as a whole without distinguishing layers such as skin, fat, or muscles. This research focuses on the mechanical characterization of medical-grade synthetic gels that can be implemented to represent the soft tissues of the hand. Six grades of commercially available gels are selected for quasi-static hardness and firmness tests as well as for controlled low-velocity impact tests, which are not routinely conducted by gel manufacturers and require additional considerations such as energy level and specimen sizes relevant to the specific application. Specimens subject to impacts represent the hand thicknesses at the fingers, knuckles, and mid-metacarpal regions. Two impact test configurations are considered: one with the gel specimens including a solid insert representing a bone and one without this insert. The impact behavior of the candidate gels is evaluated by the coefficient of restitution, the energy loss percentage, and the peak reaction force at the time of impact. The resulting values are compared with similar indicators reported for experiments with cadaveric hands. Relatively softer gels, characterized by Shore OOO hardness in the range of 32.6 ± 0.9 to 34.4 ± 2.0, closely matched the impact behavior of cadaveric specimens. These results show that softer gels would be the most suitable gels to represent soft tissues in the creation of surrogate hands that can be used for extensive impact testing, thus, minimizing the need for cadaveric specimens.

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“…Work gloves are used for the protection of hands from potential physical, chemical, and biological hazards [6][7][8][9][10][11][12]. Typical physical hazards of hand exposure at work include cuts and stabs [13], vibrations of tools and machines [14][15][16][17], load and pressure [18][19][20], high and low temperature [11,[21][22][23], and so on. Typical chemical and biological hazards, on the other hand, include hazardous substances (such as pesticides and acids) and organisms such as insects, germs, and even viruses [9,12].…”

Section: Introductionmentioning

confidence: 99%

Assessments of Work Gloves in Terms of the Strengths of Hand Grip, One-Handed Carrying, and Leg Lifting

Zhao

2021

Applied Sciences

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Gloves are used at workplaces to protect hands and fingers from potential hazards. Three types of work gloves were assessed in terms of the strength of grip, carrying, and lifting. Thirty adults (14 males and 16 females) joined as human participants. The strength data were measured under bare hand and three gloved conditions. The grip spans in the grip strength measurements included 45 mm, 55 mm, 65 mm, and 75 mm. The carrying strength was measured for both dominant and non-dominant hands under leg straight and semi-squat postural conditions. The lifting strength was measured at a semi-squat posture. The results showed that glove (p < 0.0001), grip span (p = 0.001), gender (p < 0.0001), and handedness (p < 0.0001) all affected grip strength significantly. Wearing the gloves tested in this study led to a decrease of grip strength up to 22.9%, on average, depending on gender, grip span, and hand tested. Wearing the cotton gloves led to a decrease of one-handed carrying strength ranged from 3.5% to 9.7% for female participants. All the participants took advantages in carrying strength when wearing the cut-resistant gloves. The leg lifting strength data indicated that the effects of the gloves were insignificant. The information of this study is beneficial for practitioners in the design of manual materials handling tasks concerning the use of work gloves.

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Experimental evaluation of protected and unprotected hands under impact loading

Cited by 10 publications

References 20 publications

Design and Manufacture of Data Gloves for Rehabilitation Training and Gesture Recognition Based on Flexible Sensors

Design and Manufacture of Data Gloves for Rehabilitation Training and Gesture Recognition Based on Flexible Sensors

Mechanical Characterization of Synthetic Gels for Creation of Surrogate Hands Subjected to Low-Velocity Impacts

Assessments of Work Gloves in Terms of the Strengths of Hand Grip, One-Handed Carrying, and Leg Lifting

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