In addition, the fatigue strength
of welding seam depends on weld's quality, but there are differences because of different welding technology level for technical staffs.
Since the fatigue strength
of steel is appreciably less when the surface is rough or has a notch-sensitive stress riser, a good rule of thumb is not to have any more than 3.5 tons/[in.sup.2] of pressure on materials having a hardness value of 300 Brinell (32 Rockwell C), or any more than 5 tons/[in.sup.2] on materials having a hardness value of 50 Rockwell C.
The stress seems to be negligible when compared with the fatigue strength
of the rod tip of 300 MPa .
The distribution characteristics of model uncertainty parameters such as the fatigue strength
exponent b, fatigue ductility exponent c, fatigue strength
coefficient [[sigma]'.sub.f], and fatigue ductility coefficient [[epsilon]'.sub.f] are also considered as random variables as listed in Table 3 .
Based on the longer crack initiation phase, the quality of steel now has a role in the increase of fatigue strength
The life span and fatigue strength
of a metallic substance can upgrade surprisingly after LSP as a result of the occurrence of compressive residual stresses in the substance [7, 9].
Furthermore, these polyaldehyde compounds make it possible not only to obtain rubber compositions exhibiting the same low-strain stiffness as conventional rubber compositions using HMT or H3M methylene donors, but also, surprisingly, to greatly improve the fatigue strength
of the rubber compositions and thus the endurance of the tires.
Among the topics are the effect of shot peening on the surface topography and fatigue strength
of selected sheets, some possibilities for evaluating the corrosion resistance of metal and non-metal coatings, evaluating specific environmental and degradation characteristics of surface-treated wood, predicting wrinkling and optimizing the sheet metal forming process by numerical simulation, and the possibility of increasing the mechanical strength of carbon/epoxy composites by adding carbon nanotubes.
They studied the effect of a high, 4 MPa, and a low, 0.8 MPa, weld pressure on the static and fatigue strength
of VW specimens at room temperature.
Fatigue tests were also conducted to verify the fatigue strength
of group stud shear connection.