The phase transition behavior from strain hardening
to strain softening appears gradually with the confining pressure increasing.
Comparison of the constant K specified in the material of the sheets of the material DC 04 with the measured values obtained for the examined materials of the F-M steels (Table 2) show that the constant K (K = 1052 - 1336 MPa) of all materials was higher that of a steel sheets DC 04 and the values of the strain hardening
exponent of materials produced by intercritical annealing were greater or comparable with the DC 04.
"We have found that the Strain Hardening
test delivers reproducible results which very nicely correlate with results of time-consuming traditional slow crack growth tests -- but in a much shorter time," says Frans Scholten, expert on material testing at Kiwa Technology.
The microstructure rearranges itself, creating strain hardening
. Strain hardening
consequentially allows for greater stress.
"Our new SabicVestolen A RELY products in combination with the strain hardening
method -- that measures their performance -- are key deliverables in Sabic's global strategy to supply the pressure pipe industry with breakthrough technologies," said Jean Engels, business manager HDPE Sabic.
Childs  worked on materials subjected to a range of thermal softening and strain hardening
and studied their FE simulations.
Fracture phenomenon during pull-out process is described in four stages, which are; pre-slip, slip, transition, and strain hardening
. The loads and displacements for each stage are presented in Table 1 and 2, columns (3) to (6) respectively.
Some types of AHSS have a higher strain hardening
capacity resulting in a strength-ductility balance superior to conventional steels.
The strain hardening
becomes more pronounced with increasing LCB-PP content.
The most interesting results, registered at such action on the investigated joints, are abnormal tensile properties and character of strain hardening
of a specimen, whereby main attention has to be paid to elongation of the specimen .
They combine good melt strength and draw-down ratio with sag resistance and strain hardening
. They are specifically recommended for extrusion blow molding, thermoforming, and blown film extrusion.