First Year and Beyond - Granta Design

Lecture videos — views per week (spring 2009)E1E4E2spring breakE3FEUsage highest …… during exam weeks… with less familiar material

Lecture videos — views per lecture (spring 2009)For 298 enrollees:Median number of views perlecture: ~85After first 4 weeks: ~75 viewsper lecture (average)“Hermiones”FEE4E3E2E1

Observations: InfoTech for a large first-yearcourse Challenge: keeping students engaged in large lectures Strategy: Vary the pace!• Demonstrations • Anecdotes • Videos• Chalk-talk • Document camera • Volunteers … Even demos over the document camera work Lecture attendance: ~50% Details on slides don’t transfer well to video make slides available to students

CES EduPack in a first-year courseThree required homework assignments (10% of grade):• #1: The interatomic potential & materials properties• “Scavenger hunt” • Melting point vs. thermal expansion• #2: Thermodynamics & materials processing• Embodied energy • Recycling• #3: Thermal, mechanical, electrical properties• Thermal & electrical conductivity (Wiedemann-Franz law)• Simple materials selection problemsIllustrating basic science with real materials

Melting temperature vs. thermal expansion• Start with Elements database• Primary vs. secondary bonding• Best fit?Thermal expansion coefficient at 300K (µstrain/°C)100010010120 50 100 200 500 1000 2000Melting temperature (K)

Melting temperature vs. thermal expansionSwitch to Level 1 database:• Trend is general• Materials clusterby category• Ranges vs.discrete valuesThermal expansion coefficient (µstrain/°C)2001005020105Polyethylene (PE)Lead alloysConcrete2500 1000 2000Melting point (K)

First-year undergraduate research projectWhat goes into “embodied energy”?• Sources of data• Variability of values• Specific materialsEmbodied energies for alternative-energy materials*• Photovoltaics• Fuel cell materials• Thermoelectrics• Batteries*) not in EduPack

2 nd - through 4 th -year students: Intro. to MS&E• Specificembodiedenergy, E e,m(J/kg)• Embodiedenergy perunit volume,E e,v = E e,m ρ(J/m 3 )

2nd- through 4 th -year students: Intro. to MS&E• Specificembodiedenergy, E e,m(J/kg)• Embodiedenergy perunit volume,E e,v = E e,m ρ(J/m 3 )• Annual energyconsumption,by material

2nd- through 4 th -year students: Intro. to MS&EPedagogical goal: translate design criteria tomaterials selection constraints (or objectives)Example*: A cylindrical rod 120 mm long andhaving a diameter of 15.0 mm is to be deformedusing a tensile load of 35.0 kN.35.0 kN15.0mmIt must experience neither• plastic deformation nor• reduction in diameter of more than1.2 x10 –2 mm.120 mmWhat materials are possible candidates?*) From Callister, Materials Science & Engineering: anIntroduction

Re-express design criteria asconstraints on materials properties“No plastic deformation”⇒ applied stress < elastic limit (yield strength)⇒“Diameter reduction < 1.2 x 10 –2 mm”⇒

Graphical solution•Plot E/ν vs. σ y• Select fromhundreds ofmaterials,instead of4 or 5• Noticegroupings ofmaterials bycategory

More Intro. to EMSEThermal shockresistance:•Can groupmechanicalpropertiesvs. thermalproperties

Usage of CES EduPack in other coursesEBME 370: Principles of Biomedical Engineering DesignEBME 380: Biomedical Engineering Design ExperienceEMAE 372: Relation of Materials to DesignEMSE 303: Mechanical Behavior of MaterialsEMSE 313: Engineering Applications of MaterialsEMSE 421: Fracture of Materials

Senior design project: Triathlon bike frameKen Craymer, mechanicalengineeringMaterials selection criteria:• Young’s modulus• Specific yield strengthMaterial selected: Graphitefiber-reinforced polymer(GFRP)

Senior design project: Triathlon bike frameKen Craymer, mechanicalengineeringMaterials selection criteria:• Young’s modulus• Specific yield strengthMaterial selected: Graphitefiber-reinforced polymer(GFRP)

Senior design project: Torsion testing deviceAshley McKee,mechanical engineering:“I am working on designinga torsion testing device andI need to see what type oftorque we can expect toobtain for differentmaterials used in metallicbone screws in order tomake sure we buy a motorthat can withstand thesevalues.”

Senior design project: Minimally invasive tool to insertelectrodes for functional electrical stimulationJoseph Gabra, KatherineElhert, Robert Jiang, KennyNam, Jonathan Shaul,biomedical engineering:“The grooved teeth will help hold theelectrode. … when the tool is movinginto the patient the electrode iscontinually held and when the tool ispulled out the electrode is released.”

Senior design project: Minimally invasive tool to insertelectrodes for functional electrical stimulationJoseph Gabra, KatherineElhert, Robert Jiang, KennyNam, Jonathan Shaul,biomedical engineering:Materials selection criteria:• Yield strength• Fracture toughness• Flexural modulus• Fatigue stress• FDA approval for Class IIbioengineering• PriceMaterials: Stainless steel,titanium

AcknowledgmentsCase Western Reserve University LibrariesWilliam “Bud” Baeslack, CWRU ProvostNorman Tien, Dean of Case School of EngineeringCWRU Office of Instructional Technology andComputationGranta