ABSTRACT
In the stress-controlled test [Fig. 8.15(a)] the lateral load Fa which induces shear is gradually increased until complete failure occurs. This can be done by placing weights on a hanger or by filling a counterweighted bucket of original weight W at a constant rate.· The shearing displacements are measured by means of a dial gauge G as a function of the increasing load Fa. The shearing stress at any shearing displacement, is
where A is the cross sectional area of the sample. A typical shape of a stress-strain curve of the stress-controlled test is shown in Fig. 8.15(a).
