As previously mentioned, fatigue strength of every welded detail depends on imperfections inside the weld and local stress concentrations due to the effect of detail geometry or the notch effect
Most plastics are not sensitive and the increased stress at the notch is called the "Notch Effect
." Sharp internal corners in particular can produce stress concentration that inherently reduces the apparent ductility of the material.
Finally, it should be pointed out that, in Figure 14 and 15, the increased throat thickness due to the presence of a large weld convexity was also considered in the calculation of the nominal stress; this was considered to be necessary because, in fact, the weld convexity represents an increase of the throat thickness and thus an inherent reinforcement against root cracking--while it represents a strong additional notch effect
for toe cracking.
on multiaxial low cycle fatigue, International Journal of Fatigue 33(8): 959-968.
The notch effect
is modeled by an increase of the local stress in a restricted volume, compared to the distribution of nominal stress.
The shot peening by glass beads (method-4) shortened the time, possibly due to the notch effect
. Threshold strain was unaffected by the shot peening, but was low at 0.22%.
This variation technique distributes the notch effect
from machining onto different areas of the cutting edge and effectively postpones the development of the notch.
The stress intensity is highest at the edge of the specimen due to the notch effect
, where it is the ideal site for cracks to initiate.
Radially adjustable cylindrical pins are required for the first type, and these are prone to fatigue failure due to the notch effect
in the area where they protrude through the barrel.
The gradual change of the graphite shape from flakes in gray iron to a wormlike shape in compacted graphite iron reduces the notch effect
inside the iron.
The article also includes results of the notch effect
on a stress triaxiality under the elastic stress state with the evolution to the increasing elastic-plastic deformation.