β Scribed by M.S. Salib; A. Petrou; D.D.L. Chung
No coin nor oath required. For personal study only.
attributed to damage, as supported by the accompanying decrease in the elastic modulus. Damage occurs at stress amplitudes 1 58.1% of the fracture stress and increases wttb increasmg stress amplitude.
Irreversible strain occurs at stress amplitudes Z 73.1% of the fracture stress and increases with increasing stress amplitude.
Thus, damage occurs not only when there is irreversible strain, but also at a stress amplitude of 58.1% of the fracture stress, at which the strain is totally reversible. This suggests that damage can occur even in the regime of elastic deformation.
The strain sensitivity values given in Table 1 are slightly lower than those of Table 2 because the total strain was considered in Table 1 and the reversible strain was considered in Table 2. Nevertheless, in both cases, the strain sensitivity is quite independent of strain/stress for essentially the whole range of strain/stress up to fracture. The strain sensitivity values are higher than the
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