SEgan_Materials Selection Methods and Information Databases for Design_Cambridge2013
Transcript of SEgan_Materials Selection Methods and Information Databases for Design_Cambridge2013
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www.grantadesign.com
Materials Selection Methods and Information
Databases for Design of Optimised Medical
Devices
Dr Sarah Egan
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Introduction to Granta Company overview
Brief history
Rational Materials Selection
Principles of rational materials selection
Case study:
Advanced Information for Medical Device Design
Biological response to synthetic materials Biomechanics of human tissues
Information databases in action
Outline
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Company overviewBrief history
Introduction to Granta
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The materials information technology experts
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Selected customers
Aermacchi
Airbus
ASCO Industries
Baker Hughes
Baxter Healthcare
Boeing
Bombardier Aerospace
Bosch
Carrier
Centro Ricerche Fiat
Chengdu Aircraft
Cochlear
Constellium
Covidien
DePuy
Deutsches Zentrum fr Luft- & Raumfahrt
EADS Astrium
ESA
Eurocopter
GE - Aviation & GE - Energy
Honeywell Aerospace
Ishikawajima-Harima Heavy Industries
JLR
Lab 126 (Kindle)
LL Products
Lockheed Martin
MASCO
MBDA Group
MTU
NASA
Northrop Grumman
Novo Nordisk
Owens Corning
Parker Aerospace
Perkins EnginesPhilips Technologie
Raytheon
Rheinmetall (KSPG Automotive)
Rhodia
Rolls-Royce
RUAG Space
Suzlon
Sulzer
Toshiba Corporation
The Timken Company
Thyssen Krupp Steels
TRW Automotive
VestasWhirlpool
The Granta team
The worlds largest concentration of materials
information technology expertise
110 engineers, scientists, developers, support staff
Locations & service partners in US, Europe, A/P
Providing software, data products, services
Consistent growth with profitability
Customers: many of the worlds leading
engineering enterprises
Grantakey facts
Cambridge team, July 2010
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Granta for industry
Materials &Processes
Materialsdecision
support
Eco design &
environmentalregulations
Materialsinformation
management
Materials
support forCAD, CAE
http://www.ugs.com/http://www.simulia.com/ -
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GrantasCES EduPack is used to supportteaching of materials & processes at 800
universities and colleges worldwide
Granta for education
The next generation of
engineers is familiar with
Granta and its technology
Materials Education Symposium, April 2011
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Granta Designinnovating since 1994
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1994: Granta Design is founded; key
UIPs:
Extensive materials data compilation
Materials property charts (Ashby
charts)
Performance index concept
1stProduct: Cambridge Material
Selector
1995-7: Development and refinement of materials data compilation using first
implementations of Grantasunique data checking and estimation techniques
1998: 1strelease of Cambridge Process Selector
1999: CES Selector launched1stintegrated material and process selector
2000: Strategic investment by ASM International, Granta now extends
expertise to management and publication of materials data
2001: Granta provides digital online version of MIL-HDBK 5
Granta Designinnovating since 1994
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2002: Launch of MDMC by Granta, ASM, NASA.
New tools for plastics selection
2004: First release of GRANTA MI, later to become industry standard for
corporate materials information management
2005: New CES Edupak, building on materials data and selection tools with
content, tailored databases and resources for teaching
2006: Materials Strategy Consortium startsfocus on cost optimisation
2007: New Materials for Medical Devices database
2008: Eurocopter hosts first meeting of new Environmental Materials
Information Technology (EMIT) consortium
2010: Granta opens new headquarters at Rustat House and expands team to
80 people
2011: First overseas offices (in US & Germany)
Collaboration with Autodesk to deliver a new eco design tool
New software for coatings and composite data management.
Granta Designinnovating since 1994
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Principles of rational selectionCase Study: Medical Forceps
Rational Material Selection
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Conventional approaches:
Use previous material, use a familiar material
Ask materials vendor
Ask colleague or consultant
Unstructured database/Web search
Rational Selection methodology:
Rational materials selection:
Exhaustive
Systematic
Auditable
Requirements:
Complete & comparable dataset for all materials
Use of Perform ance indic es (e.g. co st per un it of st i f fness)
Design Requirements
Optimal material for applicationAll materials
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5 obstacles to rational materials selection:
Lack of a rational, systematic method
Lack of relevant data
Non-comparable data
Holes in the data
Lack of information on material price
Why is it difficult?
Exhaustive
Systematic
Auditable
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CES Selector
Material selection for a new product
Replacement of a material in an existing product
Evaluation of materials recommended by a vendor
Expert PC-based tool for material users and producers
that aids cr i t ical design & bus iness decis ions:
Key components
Rational Selectionmethodology
Data on materials & processes
Visualization & selection tools
Prediction & evaluation tools
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Rational selection methodology - Ashby
All Materials
Breakdown design requirements into:
FunctionWhat does the component do?
ConstraintsWhat essential conditions must be met?
ObjectivesWhat is to be maximized or minimized?
Screen on constraints - Go / no-go criteria (usually many)
Rank on objectives - Ordering of materials that go
Supporting informationSpecialist databases, contact suppliers
Local conditionsPreferred suppliers, process capability, location
Top Candidate Materials
Final Selection
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Ranking - Performance Index Finder
Key component of Rational Select ion methodology
Identifies & plots Performance index
Covers main standard load cases
(mech anical, therm al, electrical, vapo ur barri er)
Optimize: mass, volume, cost, eco footprint...
Trade-off multiple objectives
Mass per
unit of stiffness
Mass vs cost
trade-off
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Example of resulting Ashby chart
LowerCost
Lower Permeability
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Case study: Medical forceps handle
Function:
Handleof minimally-invasive electrosurgical forceps
Constraints:
Biocompatibility USP class VI or ISO 10993 Sterilizability (steam autoclave) Good or Excellent
Mechanical Stiffness & strength in bending
Mechanical toughness Impact Strength >7 kJ/m^2
Electrical Insulator
Dimensional stability Water absorption @ 24hr < 0.5%
Processing 3D complex shape; surface finish
Objectives:
Minimize cost
Minimize volume (component size)
Beam loaded in bending
Stiffness-limited design
Length, section shape specified
Section area freeCurrent material:
PEEK (unfilled)
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Biological response to synthetic materials
Biomechanics of human tissues
Information databases in action
Advanced Information for
Medical Device Design
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Information needs:
1. Properties of materials used to make devices
2. Properties of surrounding tissues:
Biological response Mechanical properties
Materials in medical device design
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Information needs:
1. Properties of materials used to make devices
2. Properties of surrounding tissues:
Biological response Mechanical properties
Materials in medical device design
Medical Materials Database
Cardiovascular module
Orthopaedic module
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In addition to mechanical/physical properties, information is
needed on: Chemical and biological properties
Regulatory classifications
Compatibility of materials, surface treatments, coatings and drugs
Predicate devices
Historically, this information has been:
Complex and poorly structured
Sometimes of questionable quality
Widely dispersed (literature, books, suppliers, FDA, patents)
Time-consuming to find and compile
Information gap between engineers and medical personnel
Engineers often do not understand the biology and vice-versa
Medical materials information needs
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An information resource & associated tools providing:
Engineering propertiesANDbiological response
ANDcoating and drug compatibility information
Application information
where materials are used in predicate devices
Covering materials used in:
Cardiovascular implantable devices, plus catheters
Orthopaedic implantable devices and trauma
Developed in conjunction with:
Guidance committee
Peer review panel
What is the Medical Materials database?
DEMONSTRATION
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Information needs:
1. Properties of materials used to make device
2. Properties of surrounding tissues:
Biological response Mechanical properties
Materials in medical device design
Human Biological Materials
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Textbooks
Quickly find simple data
Limited detail concerning age, direction dependencies
Journal articles
Wide range of articles covering different tissues, testing methods,
dependencies etc.
Time consuming do exhaustive search
Difficult to analyse effects of different tissues, testing methods etc.
Animal tissue testing
Not human tissue
Costly
CT scan data
Dependent on empirical density/property relationships
Person specific
Typical data sources
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Material properties of human tissues
Mechanical
Physical
Current coverage: Load bearing bones
Femur
Tibia
Vertebrae
Acetabulum
Age and direction dependence
Export directly to FEA packages
Human Biological Materials
DEMONSTRATION
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1. GRANTA MI
Access from company internal servers
Combine with synthetic material databases AND
proprietary dataCOMPLETE RESOURCE
2. Online
As part of ASM Medical Materials database series
Availability