Is Digital Simulation Good Enough to Replace Physical Tests?

Left: Nonlinear finite element analysis (FEA) of a coupler with MSC MD-Nastran including effects such as large deformation, buckling, and self-contact. Right: Nonlinear FEA of a rubber (elastomer) CV Boot performed in MSC.Marc including nonlinearly elastic Ogden material model, pre-stress associated with installation, large deformation, large strain, contact with other components, and self-contact.

During the live Q&A session in my previous webinar with Autodesk’s Amy Bunszel and PTC’s Sandy Joung (”Materialistic Engineering: Building Stronger, Better Parts Using Interactive Tables and Equations,” sponsored by Knovel), one caller raised the following question.

Is digital simulation good enough to replace physical tests?

To explore the topic further, I enlisted the help of Dr. Kim Parnell, founder and principal of PEC-Parnell Engineering & Consulting. (To hear webinar copresenters Amy and Sandy’s responses to the same question, you can download the archived webinar.)

According to Dr. Parnell, “[Digital] simulation has definitely come a long way from its initial applications in linear, structural analysis. Today, complex nonlinear structural analysis is commonplace ... the other area where it has grown is in fluid dynamics.”

On software-driven simulation’s reliability, he noted, “If the question is, ‘Can I totally replace physical testing [with digital simulation], and therefore do no physical testing and only do simulation?’ I would say, in most cases, ‘No.’ But you can definitely reduce the amount of [physical] prototypes you build by the use of simulation ... Tests can be expensive. Prototypes may be very expensive. By reducing the number of prototypes you build and the number of tests you perform, you get a tremendous amount of benefit.”

He also cautioned, “Simulation by itself is not enough. You need to do a certain amount of testing for understanding the variability, in geometry, materials, load, etc., and the environment in which the product is going to exist. The more high-value the product is, the more critical it is to life and safety, then the more you need to do beyond basic simulation.” For more, listen to my recorded interview below:

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About Kim Parnell

Dr. Parnell is an expert in the development and application of finite element analysis (FEA) techniques and the use of computational analysis to solve real-world problems. He has over 25 years of project experience involving critical engineering skills such as simulation, fracture/fatigue,  reliability, life testing, FMEA, metallography, SEM inspection, failure analysis,  forensic engineering, and root cause analysis with applications in fields including energy, medical devices, and vehicle crashworthiness. He can be reached via LinkedIN or PEC. Email at kim.parnell [at] stanfordalumni.org.

At the time of the interview, Dr. Parnell was senior manager in product management at MSC Software, an analysis software developer. Now, through his firm Parnell Engineering and Consulting (PEC), he continues to work with MSC Software and other clients as an independent consultant.

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Kenneth Wong

Kenneth Wong is Digital Engineering’s resident blogger and senior editor. Email him at [email protected] or share your thoughts on this article at digitaleng.news/facebook.

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