nominal stress

nominal stress

[′näm·ə·nəl ′stres]
(metallurgy)
The stress calculated by simple elasticity theory, ignoring stress raisers and plastic flow; in tensile testing of a notched specimen, the load applied at the notch divided by the initial cross-sectional area at the notch.
References in periodicals archive ?
The maximum nominal stress decreased slowly in the area of negative a-values, until a minimum was reached for a = -90[degrees], when the stress concentration acted on the flow split area.
with a = crack length, [sigma] = nominal stress and C = geometry factor (18):
Welded specimens exhibited a large reduction in the maximum nominal stress compared with nonwelded specimens, an abrupt drop in the stress after maximum and limited elongation capability.
the as-molded materials), the material strain softens: the nominal stress drop occurs just past the yield point due to the failure and disconnection of the lamellas and remains stationary while the tie molecules are pulled out from the fragmented lamella and become part of the amorphous layers.
Here [[sigma].sub.y] corresponds to the yield stress as conventionally determined for polymers, i.e., the maximum on a nominal stress versus engineering strain plot.
Zone III is also characterized by a strong dispersion and the nominal stress at failure is relatively smaller (<16 MPa) compared to the other cases.
The breaking stress can be obtained from the top load basing on the load, deformation and the curve of nominal stress and strain.
There are several damage initiation criteria, such as the maximum nominal stress criterion, the maximum nominal strain criterion, and the quadratic nominal stress criterion.
The nominal stress at which visible water flow started is plotted against cross-head speed in Fig.
The resulting increase in the internal lever arm, a long critical cross section, stands as the reason for the increased nominal stress. These considerations are not confirmed for the HPFRC specimens.
According to the above theory, if the material element of V-shaped notch bottom is equivalent to the smooth bar, the fatigue life [N.sub.f] for the smooth bar under the action of [DELTA][epsilon] is regarded as the crack initiation time [N.sub.i] under the action of nominal stress range [DELTA][sigma].
Results of pulsating tension tests Stress Material ratio R [N.sub.G] amorphous 0,1 6,7-[10.sup.5] +/-45[degrees] tissue 2,2-[10.sup.5] unidirectional 45[degrees] 6,7-[10.sup.6] unidirectional 0[degrees] 6,5-[10.sup.5] unidirectional 90[degrees] 4,8-[10.sup.6] Nominal stress amplitude [sigma] [A.sub.n] [MPa] Material [P.sub.A]=50% [P.sub.A]=10% amorphous 9,0 8,4 +/-45[degrees] tissue 6,7 5,8 unidirectional 45[degrees] 5,2 4,9 unidirectional 0[degrees] 27,1 24,4 unidirectional 90[degrees] 3,2 2,9 Scatter range Material Slope k [T.sub.N] amorphous 4,94 2,02 +/-45[degrees] tissue 7,95 10,80 unidirectional 45[degrees] 17,83 12,73 unidirectional 0[degrees] 16,98 34,34 unidirectional 90[degrees] 16,18 28,02