The ZapperBox
1) Fracture Marking Challenge Conventional fracture marking methods (High R-ratio blocks) do not work well with metals like Ti, nor at near threshold conditions. Innovation Local Heat Tint using electric pulse promises good observability in heat- tintable materials all the way down to threshold levels. 2) Local Heat Tint Technique •Local current
density with 1/√r singularity at tip •Local
resistance heating proportional to 1/r •Steep linear
temperature gradient near tip
•Can be
tailored to size local tint zones 3)
Electrical Field Analogous to Mode III Analogous to deformation, we can express the singular voltage field in terms of a scalar multiplier. Franc3D updated to obtain accurate KE | 4) Proof of Concept: High Amp Pulse in Ti Foil Digitally enhanced tint colors from oxide layer film. Tint radius 0.14 inch—100x larger than required to mark. Asymptotic Electrothermal solution developed to enable temperature control. 5) Crack-tip Temperature Control •Franc3D/Mode
III handbook solutions used to obtain KE solution. •Steady-state
thermal solution depends on external boundary conditions. •Local
Transient thermal solution insensitive to external boundary conditions. •High-Amp
transient electric pulses renders local thermal response largely geometry
independent for given (KE, tpulse), and enables
sharp tint lines.
•KE and transient thermal solutions built-in to
FractureLab software to enable precision crack tip heating/local tinting for
common specimens. | 8) The Takeaways The •4000 Amp, precision pulse capability •115 lbs, 19”inch rack
mount or wheels
•Windows
compatible software Portfolio of products for exploratory research requiring High Ampere, Short Duration Pulse •Series 4000 for Entry Level Marking |