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Measurement of stresses under elastic-plastic strain conditions at elevated temperatures (550° F maximum)

A program to evaluate a strain gage suitable for measuring strains in the range of −0.2 percent to +0.6 percent for a 280-hr period with temperatures ranging from 150 to 550° F is discussed

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Abbreviations

D :

degrees rotation of jack bolt

D ij :

diameter of Mohr's circle for equivalent stress condition

G mod :

gage gactor based on a uniaxial-strain field

D mfg :

gage factor based on a uniaxial-stress field

K t :

lateral sensitivity of gage

S alt :

alternating shear stress

t :

beam thickness (includes height of sensing element from beam surface)

∈ 1m :

measured strain along axis of test beam

∈ 1t :

true strain along axis of test beam at height of sensing element

∈ 2m :

measured strain 45 deg from axis of test beam

∈ 2t :

true strain 45 deg from axis of test beam at height of sensing element

∈ 3m :

measured strain perpendicular to axis of test beam

∈ 3t :

true strain perpendicular to axis of test beam at height of sensing element

σ x :

stress along axis of element No. 1 of rectangular rosette

σ y :

stress along axis of element No. 3 of rectangular rosette

T xy :

shear stress

μ:

Poisson's ratio

References

  1. Hayes, J. K., “Experimental Test Report on Evaluation of Weldable Strain Gages and LVDT's,” Combustion Engineering Report CENC-1092.

  2. Perry, C. C., “Errors Due to Transverse Sensitivity in Strain Gages,” Presented to Technical Strain Gage Committee of SESA, May 13, 1969.

  3. Perry, C. C. andLissner, H. R., “The Strain Gage Primer,”McGraw-Hill Book Company, Inc., New York, 48 (1955).

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  4. Metals Handbook, 934 (1948).

  5. Nuclear Vessels ASME Boiler and Pressure Vessel Code, Section III, N-415.2, ASME.

  6. Criteria of Section III of the ASME Boiler and Pressure Vessel Code for Nuclear Vessels, ASME.

  7. Lawton, C. W., “High-temperature Low-cycle Fatigue: A Summary of Industry and Code Work,”Experimental Mechanics,8 (6),257 (1968).

    Article  Google Scholar 

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Author information

Authors and Affiliations

  1. Nuclear Components Test Laboratory, Combustion Engineering, Inc., Chattanooga, Tenn.

    J. K. Hayes (Supervisor and Senior Test Engineer) & B. Roberts

Authors
  1. J. K. Hayes
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  2. B. Roberts
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Hayes, J.K., Roberts, B. Measurement of stresses under elastic-plastic strain conditions at elevated temperatures (550° F maximum). Experimental Mechanics 10, 440–448 (1970). https://doi.org/10.1007/BF02319999

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  • DOI: https://doi.org/10.1007/BF02319999

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