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Development of High-Performance Electric Strain Gage for High-Pressure Hydrogen Gas Use
| Content Provider | Semantic Scholar |
|---|---|
| Author | Matsuo, Takashi Furukawa, Hiroaki Seki, Katsuo Shimizu, Kiyoaki Watanabe, Shogo Matsuoka, Saburo |
| Copyright Year | 2013 |
| Abstract | The changes in output of Cu-Ni, Ni-Cr and Fe-Cr-Al strain gages in 90 MPa hydrogen gas and 90 MPa nitrogen gas were investigated to reveal the basic principles of electrical resistance strain gages for high-pressure hydrogen gas use. In addition, the relationships between the electrical resistance and the hydrogen content of metallic specimens exposed to 100 MPa hydrogen gas at 270°C for 40 h were investigated to clarify the effects of hydrogen on the electrical resistance of metal foils (Cu-Ni, Ni-Cr and Fe-Cr-Al), gage lead (pure copper: Cu), and solder (lead-free solder: Sn-Ag-Cu) used in the strain gages. The output changes of the Cu-Ni gage and the Ni-Cr gage in 90 MPa hydrogen gas were much larger than those in 90 MPa nitrogen gas. On the other hand, the FeCr-Al gages showed almost the same output changes in 90 MPa hydrogen gas and 90 MPa nitrogen gas. These results suggested that the strain gage output was affected by both of the pressure of the gas and the invasion of hydrogen for Cu-Ni and Ni-Cr gages, while the output was affected only by the pressure of the gas for Fe-Cr-Al gage. This suggestion was supported by the hydrogen content measurement and electrical resistance measurement of the specimens exposed to 100 MPa hydrogen gas. The electrical resistance of Cu-Ni and Ni-Cr specimens was changed by exposure to hydrogen gas, because the large amount of hydrogen invaded into the specimens. On the other hand, the resistance of Fe-Cr-Al specimen was not changed by exposure to hydrogen gas, because almost no hydrogen invaded into the specimen. In addition, almost no hydrogen invaded into the copper and lead-free solder specimens, when they were exposed to hydrogen gas. It was concluded from these results that Fe-Cr-Al metal foil sensor, pure copper gage lead and solder joint are effective for the strain gage for high-pressure hydrogen gas use. Introduction The development of fuel-cell vehicles and hydrogen stations is demanded to solve global warming and other energy issues. The easiest way of transporting and storing hydrogen is to keep it in the form of high-pressure gas. Therefore, the strength evaluation of parts and components of hydrogen energy systems is essential for ensuring the safety of the systems. The Research Center for Hydrogen Industrial Use and Storage in Japan (HYDROGENIUS) has 1 MPa to 120 MPa hydrogen fatigue-testing machines. Electrical resistance strain gages are used in load cells and clip-on gages of the machines. Hydrogen Test and Research Center in Japan (HyTReC) is an experimental facility for the strength evaluation of parts and components of hydrogen energy systems. In HyTReC, strain gages are being used to measure the strains of parts and components in high-pressure hydrogen gas of up to 99 MPa. Figure 1 [1] is a schematic illustration of an electrical resistance strain gage. Metals are used for the foil (sensor), joint and lead. As a part is deformed, the strain gage attached to the part is deformed, causing the change in the electrical resistance of the metallic foil. Strain is calculated from the change in resistance as: |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.gruppofrattura.it/ocs/index.php/esis/ECF19/paper/download/8920/5696 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
