Reed, P.A.S. and Knott, J.F.
Investigation of the role of residual stresses in the warm prestressing (WPS) effect part I: experimental
Fatigue and Fracture of Engineering Materials and Structures, 19, (4), .
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The role of residual stresses in the warm prestress (WPS) effect has been investigated in the following two papers. Three types of specimen have been tested in this investigation : smooth uniaxial tensile specimens, blunt notched single edge notched bend (SENB) specimens and sharply precracked SENB specimens. Room temperature prestraining of uniaxial tensile specimens leads to a dramatic decrease in the measured nominal fracture stress at -196?C. Such an embrittling effect may be expected to reduce the beneficial increase in subsequent fracture toughness commonly observed in WPS sequences. The blunt-notched specimens were prestressed in tension and compression. Compressive prestressing was found to lead to a decrease in subsequent fracture load whereas tensile prestressing leads to an increase. The load decrease following a compressive WPS was greater than the load increase following a tensile WPS. Various sequences of loading, unloading and cooling have been investigated and the differences in the subsequent fracture behaviour of specimens have been explained qualitatively by superposition arguments. The theories of Chell  and Curry  have been supported by the general trend of results, but a more thorough critical review of their models can be found in the following paper (Part II - Analysis).
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