The expansion coefficients of specimens under tensile stress and after the stress has been removed have been measured for three steels (0.20, 0.40, 0.80% carbon) and for two types of Invar. If the applied stress is below the elastic limit the change in expansion coefficient α, with stress σ is shown to be given by , where E is Young's modulus and T the temperature; if the stress is removed the expansivity returns to its original value. When the applied stress exceeds the elastic limit, there is a discontinuous change in expansion coefficient, and the expansivity on unloading differs from the original value. The lattice distortion associated with the onset of even a slight plastic strain (2×10−6) appears sufficient to change the expansion coefficient both under load and after the load is removed.
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February 1956
Research Article|
February 01 1956
Effect of Stress on the Expansion Coefficient Available to Purchase
A. R. Rosenfield;
A. R. Rosenfield
Massachusetts Institute of Technology, Cambridge, Massachusetts
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B. L. Averbach
B. L. Averbach
Massachusetts Institute of Technology, Cambridge, Massachusetts
Search for other works by this author on:
A. R. Rosenfield
Massachusetts Institute of Technology, Cambridge, Massachusetts
B. L. Averbach
Massachusetts Institute of Technology, Cambridge, Massachusetts
J. Appl. Phys. 27, 154–156 (1956)
Article history
Received:
October 03 1955
Citation
A. R. Rosenfield, B. L. Averbach; Effect of Stress on the Expansion Coefficient. J. Appl. Phys. 1 February 1956; 27 (2): 154–156. https://doi.org/10.1063/1.1722325
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