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Home > The Amp Hour Electronics Podcast > #399 – An Interview with Steve Kreuzer


	Podcast:		The Amp Hour Electronics Podcast
	Episode:		#399 – An Interview with Steve Kreuzer
	Category:		Science & Medicine
	Duration:		01:18:55
	Publish Date:		2018-07-15 21:37:36
	Description:		Welcome Dr Steven Kreuzer! Before we start, we were asked to mention: “The opinions and views expressed in this episode are those of Steve Kreuzer and do not in any way reflect the opinions and values of Exponent” Background Steve and Chris went to high school together, Case Western Reserve together, ended up as roommates together in Austin and now work in similar industries. 0h 1m 23s He got introduced to biomech via a program at Duke which later lead to grad school at UT Austin. 0h 2m 22s He work at the (now former) GE appliance division (they were sold to Haier in 2016) 0h 3m 49s At UT Austin, he worked on the effects of acceleration on cells. 0h 5m 6s This included understand how proteins unfold. 0h 7m 17s PhD program 0h 8m 32s Difficulty of funding sources 0h 8m 39s Salary of PhD 0h 9m 50s Lots of simulation work 0h 12m 14s Pharma seemed like the right path 0h 12m 20s Exponenet Ended up at Exponent, wanting to get a hand back into industry. 0h 12m 44s Lots of people who work there are interdisciplinary 0h 12m 52s Ended up in Menlo Park doing mechanical engineering work for them. 0h 13m 40s This included lots of CFD and FEA (links below) 0h 13m 55s Started working on Consumer Electronics devices 0h 14m 15s Steve explained the types of companies that call Exponent 0h 17m 12s Size of companies that call vary, but large companies all the way down to startups. 0h 18m 15s Exponent deals with more specified problems rather than generics. They don’t do design work, it’s more working with existing, unique problems. 0h 20m 13s One example is companies dealing with recalls. 0h 22m 10s Consulted on the Samsung Galaxy battery fires. 0h 22m 44s They helped identifying the problem. 0h 23m 47s Could it have been caught by simulation? 0h 26m 15s A big piece of prevention is reliability audits. 0h 26m 25s Another large piece is understanding if things will go wrong by doing accelerated testing, which includes temperature cycling. 0h 28m 10s Working with Lithium Ion (and other types of batteries) Steve recommends to always use Battery management units 0h 30m 12s Want to protect the cell from the environment 0h 30m 52s 18650 packs 0h 31m 51s Forces on the batteries 0h 33m 47s Protecting environment from the cell 0h 34m 31s Failing well 0h 35m 0s Simulating thermal runaway of batteries 0h 36m 10s Color maps of stresses using programs like Abaqus 0h 38m 43s Ties into Solidworks 0h 38m 57s Finite Element Analysis 0h 39m 15s Testing allows you to assign material properties 0h 41m 37s Test at their labs/facilities under a hood 0h 43m 20s “Exponents model is that we shouldn’t do anything that’s standardized” 0h 44m 0s Design an experiment where you recreate the worst case scenario 0h 46m 1s MatWeb 0h 47m 1s Reactive vs Proactive 0h 51m 23s Decision to call Exponent is often based on internal reliability testing 0h 52m 22s BGAs and working with boards in consumer products Failures in thermal cycles 0h 54m 32s Arrhenius Equation 0h 55m 12s Computational Fluid Dynamics 0h 55m 23s Was listening to episode with Dave about BGAs 0h 55m 53s Have looked at the reflow process 0h 57m 11s Viscoelasticity 0h 57m 24s Thermal stresses plus drop scenario 0h 59m 24s Simulating drops of PCBs inside enclosures 1h 1m 9s How easily a die is getting rid of heat 1h 4m 36s Human factors aspect of devices 1h 6m 3s Sony laptop that was burning “laps” 1h 6m 52s Lithium ion batteries getting thinner 1h 9m 8s What is the output of CFD research? Suggestions around changes to airflow or design. 1h 11m 29s Not as much publishing in their industry, because of 1h 13m 19s Publishing usually happens around educating the public in a field 1h 13m 32s Contact Exponent is hiring! But with a caveat…need PhD 1h 15m 54s You can email Steve directly if you have a problem you want a consultation on. 1h 17m 5s Reach out to Steve on LinkedIn 1h 17m 27s Follow him on Twitter if you want some sports updates.
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