Electromechanical tensile test equipment for stretchable conductive materials

Wiranata, Ardi; Ohsugia, Yunosuke; Minaminosonoa, Ayato; Kuwajima, Yu; Maeda, Shingo

doi:10.1016/j.ohx.2022.e00287

Cited by 7 publications

(2 citation statements)

References 24 publications

(27 reference statements)

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“…The elastomer materials used in stretchable sensors are primarily acrylic rubber [16][17] and silicone rubber [6] [8], which are polymerized by heat [6][8] or ultraviolet (UV) light [18] [19]. Typical elastomers exhibit mechanical hysteresis characteristics [20] [21].…”

Section: A Mechanical Characteristicsmentioning

confidence: 99%

Pre-Strain Method for Stretchable Strain Sensors With Linear Sensitivity Using Acrylic Elastomer and CNTs Powder

Minaminosono,

Ohsugi,

Yamaguchi

et al. 2023

IEEE Access

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Stretchable sensors can measure large strains generated in the joints of the human body. Generally, in the characteristics of carbon nanotubes (CNTs) based stretchable resistive sensors, the reference resistance (resistance at 0% strain) increases with repeated strain, and the gauge factor (GF) which indicates sensitivity is not constant. These characteristics are related to the rupture of the CNT networks. This study proposes a pre-strain method to produce the resistive strain sensor with linear sensitivity. We discovered that this method aligns the agglomerated CNTs depending on the pre-strain. The pre-strain method is simple because it requires just a brush and stretching jig without the splay, bar-coater or 3D printer. The sensor is completed by applying CNT powder to an elastomer that has been pre-strained 47% in the uniaxial direction and then returning it to its initial state (0% strain). In the strain from 0% to 100%, the GF of the sensor is 1.46 constantly, and the variance of the normalized change in resistance of the sensor is less than 0.06. Therefore, the sensibility of the sensor has strong linearity. This result solves the problem of non-linear sensitivity of sensors using CNT powder in previous research. As a demonstration, we mounted this sensor onto a wearable device for the knee joint. We acquired static angle data and dynamic walking and running data. In static experiments, the relationship between knee joint angle and normalized change in resistance was linear. The maximum uniaxial deformation velocity of 122.1 mm/s could be measured in the dynamic experiment. When the angle was returned to 0° after repeated knee joint bending, the normalized change in resistance returned to the reference value, suggesting that the rupture of the CNT networks was suppressed. These features of constant gauge factor and reference resistance are expected to simplify the system's data processing.

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Section: A Mechanical Characteristicsmentioning

confidence: 99%

Pre-Strain Method for Stretchable Strain Sensors With Linear Sensitivity Using Acrylic Elastomer and CNTs Powder

Minaminosono,

Ohsugi,

Yamaguchi

et al. 2023

IEEE Access

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“…It is necessary to add an electronic device, including a microcontroller, to enable a graphical display to the tensile test machine. The microcontroller itself processes, communicates, and translates the data resulting from the tensile test machine (Pandiatmi et al, 2017;Wiranata et al, 2022). The microcontroller used is Arduino Uno, which will be connected to the load cell sensor on the tensile test machine and a computer as the output display of the test results.…”

Section: Introductionmentioning

confidence: 99%

Development of Data Acquisition System on an Arduino-Based Tensile Test Machine for Composite Materials

Zariatin,

Kurniawan,

Afika

2023

ASIIMETRIK

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A tensile testing machine with a lower load capacity is needed to identify the mechanical properties of composite materials. Tensile testing machines for composite materials are available in the market but at high prices. Previously, using a pneumatic system, a tensile testing machine for composite materials with a maximum load of 2000N was developed. However, this tensile test machine still needs improvement because the display of eventuating forces is only in numbers, not yet including a test graph. Therefore, this study developed a prototype data acquisition system for a tensile test machine to record the test results in more detail, both numbers and graphs. This data acquisition system uses the Arduino Uno Microcontroller, which processes data from the load cell through the HX711 module intermediary. A tensile test was carried out using a bamboo fiber composite material to validate the results of testing the prototype of this data acquisition system. Furthermore, the test results data are compared with the results on the indicators of the existing tensile test machine. The test was carried out nine times with an average tensile force of 1.66 N/mm2, while the average tensile force on the tool indicator was 2.02 N/mm2. There is a difference in the average test results equal to 12%. This difference is a systematic error because nine experiments have shown the same trend, with standard error and standard deviation of 0.3368 and 0.1123, respectively. The systematic error is compensated through calibration between the load cell of the tensile test machine and a series of data acquisition systems based on Arduino Uno.

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Characterization of hydrogel filaments: investigating behavior, mechanical strength, and degradation over time

Araujo Neto,

Silva

2024

Polym. Bull.

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Electromechanical tensile test equipment for stretchable conductive materials

Cited by 7 publications

References 24 publications

Pre-Strain Method for Stretchable Strain Sensors With Linear Sensitivity Using Acrylic Elastomer and CNTs Powder

Pre-Strain Method for Stretchable Strain Sensors With Linear Sensitivity Using Acrylic Elastomer and CNTs Powder

Development of Data Acquisition System on an Arduino-Based Tensile Test Machine for Composite Materials

Characterization of hydrogel filaments: investigating behavior, mechanical strength, and degradation over time

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