Your test data show a linear relationship of ASD from tab to tab at certain
Amp as well as an nonlinear relationship of ASD vs. Amp on the same tab.
With simple regression method I reached the following equation:
ASD = A * ((T - N)/T) * ((Amp) ^ B), where:
A = 11.405, constant.
T = Total number of tabs, T = 5 in this case.
N = Number of tabs between the target tab and anode, N = 3 for the center
tab in this case.
B = 2.058, constant.
For the third stress tab, the ASD data vs. predicted values using the above
equation are like:
Amp 0.2 0.4 0.6 0.8 1.0
Test 0.24 1.2 2.1 4.2 7.2
Predicted 0.249 1.038 2.392 4.32 6.843
So to extrapolate to 27 ASD, we need to apply nearly 1.95 Amp of current.
Please notice that at the high end, this equation predicts lower than actual
value.
If you need a more detailed analysis, you can reach me at:
Yu-shan Han
Lead One Technology, Inc.
20101 47th Ave., N.E.
Seattle, WA 98155
Phone: (206)368-8429
E-mail: [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Schram Steve
Sent: Tuesday, January 26, 1999 6:19 AM
To: [log in to unmask]
Subject: [TN] Stress Testing
This is the first time I have used this e-mail system. We are not plating
PCB's, we make compact disc, specifically the mold plate used to mold
compact disc. We are not electroplating, we are electroforming, the metal
we are plating on is passivated so there is no bonding of the two metals.
The electroformed piece is completely seperate from its parent when
completed. The mold plate or stamper as we call it has all the music
physically embedded on its surface, as microscopic metal forms (125
nanometers tall x 500 nanometers wide and .5 - 3 micrometers long). The
nickel plates are 149mm in diameter and are plated at a max current of 48
amps to a thickness of 300 micrometers. The current density runs about
27-28 amps/square decimeter.
The test we are performing with the hull cell uses stress tabs, a special
panel with 5 copper foils which only plate on their front sides. The tab
closest to the anode tests the highest current density the tab farthest away
tests the lowest current density. If set up properly the first and second
tabs (the closest) should curl towards the anode due to tensile stress the
third tab should remain strait and the fourth and fifth should be curled
away from the anode due to compressive stress.
The chart sent with the stress tabs reads as follows:
Amps #1ASD #2ASD #3ASD #4ASD #5ASD
1.0 12 9.6 7.2 4.8 2.4
0.8 7 5.6 4.2 2.8 1.4
0.6 3.5 2.8 2.1 1.4 0.7
0.4 2 1.6 1.2 0.8 0.4
0.2 0.4 .32 .24 .16 .08
As you can see the 1.0 amp is the highest current for the chart and tests a
current density of 7.2ASD on the third tab. My question is how do I
interpolate this chart to test 27ASD on the third tab.
Thanks for your reply, any help is appreciated,
Steve Schram
CD Mastering Manager
Universal Studios, Universal Music and Video Dist.
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