Summary data for the tensile tests: [S.sub.y] = 0.2% offset yield strength; strength units are MPa and strain rate units are mm/mm/s.
Figures 10 and 11 plot the summary data for 0.2 % offset yield strength [S.sub.y] and tensile strength [S.sub.u], by build and by orientation.
The 0.2% offset yield when converting from MPa to psi would equal 8700 psi (60.0 MPa), and a 0.25% offset yield strength would equal 9000 psi (62.1 MPa) and match the allowable stress level given in ASME B31.5.
For example, a comparison of two identical metals that followed different forming processes yielded a 21% difference in 2% offset yield strength. Tube and fittings of various sizes were selected based on the refining, cold working, grain size, and annealing processes.
An effect of lowered and elevated temperature on ultimate tensile strength and 0.2 percent offset yield strength for both steels using marked points is presented in Fig.
1 it is visible that both ultimate tensile strength as well as 0.2 percent offset yield strength of ASTM A505 steel are quite higher than at ASTM A709 steel.
A polymer-polymer joint obtained by mechanical fastening at a compressive stress of 5% (or less) of the 1% offset yield strength
of the polymer (nylon-6) was found to exhibit irreversible decrease in the contact electrical resistance upon repeated fastening (loading) and unfastening [unloading].
According to this report, resonant frequency or ultrasonic velocity measurements can be used to predict the effect of small changes in graphite form on the tensile strength, offset yield strength
and other properties of ductile iron castings of known similar matrix structure containing up to 70% non-nodular graphite.
Offset yield strengths
and hardness, however, do not seem to be significantly affected.
Tensile strengths were reportedly lowered by 20% but offset yield strengths
and hardness were relatively unaffected.