An apparatus has been developed for creep rupture testing in high-pressure hydrogen up to 49.1 MPa at elevated temperatures up to 873 K. The apparatus is designed to facilitate the measurement of the actual load on the specimen with an external load cell irrespective of axial load caused by high pressure in the vessel or friction at sliding seals where the pull rod enters the vessel. The exact strain of the specimen can be directly measured with an external extensometer. In addition, the specimen mounting assembly is also designed to simplify the installation and operation of the apparatus. Application of the apparatus to creep rupture testing of a low alloy steel in high pressure hydrogen at elevated temperature is briefly described.
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Yokogawa et al. (1982) studied this question.
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