Caption: Figure 1: Design stress
analysis for a subsize specimen showing the stress concentrating in the gauge length.
The ties were designed in order to reach the yielding design stress
in the ultimate (ULS-Ultimate Limit State) before the failure of struts and nodes (ductile behavior).
Although both materials are strong and durable, they vary in strength and other aspects, including their pressure capacity for design stress
The load-carrying structure was made from S355, where the limit design stress
for sheets with thickness <63 mm is 305 MPa .
The analysis in the design of strength failure criterion, strength evaluation to design stress
intensity based on different stress according to different size and area of the kettle body deformation effect and influence, has different criteria.
Also provided are the shell design formulae in accordance to the 1 -foot method for product design stress
and hydrostatic test stress.
The NTSB determined the probable cause(s) of this accident to include: "The pilot's loss of control due to spatial disorientation in instrument meteorological conditions, which resulted in an exceedance of the airplane's design stress
limitations, and a subsequent in-flight breakup." They couldn't really decide anything else.
This can be over 40 percent more than the original design stress
and can lead to the complete collapse of the discharge cone or skirt region of the silo.
"The revised guidance incorporates new design stress
values for copper tube, which were not included in the original European Standard.
During its operation, the leaf spring requires that the load rate should vary within limit ([+ or -] 7%) and the maximum stress induced should be lower than the maximum design stress
. For a given stress range the leaf spring should have maximum fatigue life or as specified.
Every element was checked and verified not to exceed the allowable design stress
of 225.33 MPa.
NSF/ANI Standard 14 requires materials for pressure pipe applications meet a minimum 50-year long-term strength requirement established through PPI's hydrostatic design stress
. This includes testing pipes from at least three different slots of material and at 73 degrees Fahrenheit and an elevated temperature typically 180 degrees Fahrenheit or higher.