1.What are the effects of changes in the strain hardening index?
The ability of a material to resist localized thinning and uniform deformation during stretching.
A larger n value indicates stronger work hardening, more uniform deformation distribution, and stronger tensile crack resistance.
2.What are the effects of changes in the plastic strain ratio?
The ratio of strain in the width direction to strain in the thickness direction measures the resistance to thinning.,
A larger r-value indicates greater difficulty in thinning the thickness and stronger resistance to tensile cracking and wrinkling of the sidewalls.
3.What should you do if you suspect that a batch of materials is "not working properly"?
Perform cupping tests on suspected problematic batches and known合格 (qualified) batches under the same conditions.
A difference in IE (Intrudement) value > 1.0 mm is sufficient to determine a significant performance difference between batches.
Critical criterion: Materials with an IE value < 9.0 mm are generally not capable of deep drawing.
4.What are the effects of changes in the anisotropy of a plane?
The degree of difference of r values in different directions
The closer Δr is to 0, the smaller the anisotropy, and the less pronounced the ear (bulging) after stamping.
5.How to quickly make lateral comparisons in the cupping test?
Perform cupping tests on suspected problematic batches and known合格 (qualified) batches under the same conditions.
A difference in IE (Intrudement) value > 1.0 mm is sufficient to determine a significant performance difference between batches.
Critical criterion: Materials with an IE value < 9.0 mm are generally not capable of deep drawing.