低温応力計測法

概要

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In the construction of tank and hull structures of LNG-carriers, it is of significant importance to assure their strength under cryogenic temperatures by both theoretical analysis and experimental stress measurements on the structures. In this paper, some problems which should be considered when measuring the stress at over -190℃, are discussed by presenting test results on the characteristics of strain gages, adhesives, coating materials and lead wires. Comparison of the test results concludes that the stress measurements can be accurately made at cryogenic temperatures with use of quality controlled strain gages for which a small amount of corrections is sufficient to insure their temperature-dependence characteristics. The corrections should be made on apparent strain, gage factor and modulus of elasticity of the structural material, and the influence of lead wire length on zero shift becomes significant. It is also necessary to measure accurately the temperatures at the strain-gage location.
財団法人日本海事協会の論文