Digital Image Speckle Correlation
Minutes of Meeting – 3/4/16
(1:00 PM US Central)
Present on the Call:
Terry Fischer (Hitachi Chemical)
Professor Lu (Ryerson University)
Thilo Sack (Celestica)
Laurence Schultz (HDPug)
Discussion Details:
 While awaiting other team members to join the call, Thilo gave Terry a
view of the previous meeting with other HDPug members who signed
up for this project.
 An earlier project has done the reliability testing on some of the
stacked via structures and HDPug has the data. There are also bare
boards left over that haven’t been through Thermal Cycling for some
of these same configurations. These boards will be ideal as they will
provide a direct correlation between what failed in ATC (and when it
failed) verses some virgin structures for Professor Lu to analyze. There
is the question arises as to how to prep the boards for Professor Lu to
analyze.
 Thilo will move the team toward a Capibility Study prior to
committing full resources.
 When Professor Lu joined the call, Thilo spoke of Professor Lu‘s
project proposal for stacked via structures and gave an overview of an
approach using reliability data from a previous project, along with
virgin boards to evaluate how Digital Speckle agreed with the data.
The question of board preparation was also discussed. Thilo asked if
Professor Lu agreed that this would be a good first step, and Professor
Lu agreed (8:13). He had seen that the team from the previos project
had accumulated a large volume data, some of which agreed with his
hypothesis; some of which did not.
 Thilo said that one of the things needed was for us to map the“As
Received“ boards verses those which have been stressed, but that we
should not begin by analyzing every combination. We should pick a
couple for Professor Lu to prove the concept, then go back and analyze
the remaining 12 or 14 samples to complete the data set. Thilo
suggested that we look at a couple of boards for which we have the
reliability data and try to select boards where the reliability data is
significantly different enough that when Professor Lu does his
analysis, we would expect to see a bigger difference. That way we
would know that Digital Speckleis showing the same order of
magnitude difference as was seen in the reliability data. Professor Lu
agreed that this approach makes sense.
 Thilo’s next question was if this approach were taken would Professor
Lu still need a graduate student in order to accomplish this phase of
5722 E. Sugarloaf Trail
Cave Creek, AZ 85331
Email: [email protected]
Phone: +1 480 951 1963
Fax: +1 480 951 1107
Digital Image Speckle Correlation
Minutes of Meeting – 3/4/16
(1:00 PM US Central)
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the project. Professor Lu replied that by starting with the
measurements, he can give some quick results and others will be
interested. He was confident that we be able to do that.
The one concern that Thilo, Ivan and Bill had was around sample
preparation and how to cross-section the parts for Professor Lu‘s team
to do the Digital Speckle analysis, and as a result of the cross-section
would we stress relieve certain of the structures, and potentially
influence the results. Professor Lu answered that a symetrical place,
either front to back or side to side, would have to be used for the crosssection.
Thilo suggested that, as a next step, we would talk to bill to find out
which samples we have as-received boards for. From there we will
decide which ones we are going to use. We will need a very detailed
set of instructions on how to go about cross-sectioning them. Professor
Lu said that that will require a couple more conference calls once they
determine which kind of test vehicle they want to persue.
Laurence’s input was that, before moving forward, the team needs to
define exactly what we will do. Thilo and Terry agreed.
Laurence asked what days would be best for this call which allow
advanced notice so that the other team members can get it on their
calendars. Professor Lu is currently on sebatical and has a month-long
trip to China scheduled for April. Other than that, his schedule ispretty
clear. Thilo has a standing meeting from noon until 1 PM (CDT) on
Thursdays, otherwise Thursdays work well for both he and Terry.
Terry suggested Thursdays at 8:00 AM CDT, which works for
everyone. Thilo will be travelling next week and APEX is in 2 weeks.
March 24 was selected as the date for the next call.
Thilo volunteered to draft up a synopsis of our discussion today.
The meeting ended at 1:27 PM.
Action Items:
 Laurence1
 .
The next team call is scheduled for 3/24/16 at 8:00 AM CDT.
5722 E. Sugarloaf Trail
Cave Creek, AZ 85331
Email: [email protected]
Phone: +1 480 951 1963
Fax: +1 480 951 1107