Structural integrity seminar at Indian Institute of Science 30-7-2015
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Transcript of Structural integrity seminar at Indian Institute of Science 30-7-2015
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Indian Structural Integrity Society
Seminar on Structural Integrity Indian Institute of Science Bangalore
30th July 2015
Invited Lecture
Dr S ShamasundarMD, ProSIM R&D Pvt Ltd
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Structural Integrity Assessment
for RLA Studies – Indian context
Dr S Shamasundar
ProSIM R&D Pvt Ltd
www.pro-sim.com
small improvement in predictive capabilities will
create huge impact on cost, safety, and reliability.
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Its good to be back!
ProSIM pioneered the discussion on Structural Integrity in 2006.
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Structural Integrity Indian Context
– Aerospace– Power Plants
• Nuclear/ Thermal/ Hydel/ Wind
– Oil and Gas– Marine / Naval– Other large assets (Bridges, Heavy Equipment…)
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Structural Integrity Indian Context - Design Stage
• Fairly good level of adaptation of SI in design stage
• Significant maturity in Nuclear, Aerospace sectors
– Materials testing and characterisation
– Damage assessment
– Modelling
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However, same thing can’t be said about RLA (Remaining Life Assessment)
Significant need (and hence an opportunity)
exists for adapting structural integrity
assessment in the RLA stage.
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(Multi) Million Dollar Question
Retire? Or Repair and Reuse???
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RLA Studies
Key Concerns
Risk Reliability Cost
Can we invoke R&D, technology to
derive commercial benefit for
operators, users ???
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QUESTIONS::: How do we ---
• Assess the extent of damage and life
consumed?
• assess the remaining useful life in a
scientific manner?
• Assess Probability. ensure
reliability?
• minimise risks of failures?
• put confidence?
• do these in a cost effective manner?
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An example of similar project
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RLA studies on Landing Gear
Main Landing Gear
Challenges
NO INFORMATION ON
Design data
CAD models
Operational history / Load Spectra
Materials
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nth block loading
Case 1- x cycles
Case 2- x cycles
Case 3 - y cycles
Case 4- z cycles
1st block loading2nd block loading
Nose Landing Gear
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Effect of dwell period on crack growth in an Aero
engine turbine disc – (DMRL)
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Creep-Fatigue analysis steam turbine IP turbine shaft
MST Piping Life
Criticality -
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Usage Pattern
• Load Spectra
• Damage Inspection
• Failure Histories
Physical Testing
• Material / Damage Characterisation
• Instrumented Strain gauge tests
NDT• Damage
sizing , hot spots
Physics based modelling
• Stress, temperature
• cyclic life
• Time dependent life
• Crack Growth
Statistical Modelling
• Data Analysis
• Neural Network
Computational Intelligence
• Retire Repair
Online data
monitoring
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Real Challenge• design and material data is not available from OEM.
• Even the GA and floor drawings are not updated /
‘as-installed’
• RLA work depends on the quality of maintenance
data – not available in proper format
• Our forces and BRDs do not have a track of keeping
these data. Relevant data is not often recorded.
• The data is insufficient, amd
• Operators have to be guided to obtain needed data, in
a proper format.
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Real Challenge• In power plants – maintenance period is only 4 to 6
weeks. Within that time frame entire RLA work has
to be completed.
• Eg. Hangar layouts, type are not as what will be in
the drawing.
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Some Thoughts on
InSIS activities
• SI study- cross functional, multi-industry, and inter-disciplinary– InSIS to create subgroups
• Create forum for interaction between users/ operators/ R&D/ academia /regulators / technology providers/ and all related groups.
• Involve direct beneficiary industries for problem definition
• Create user / operator education programs and follow-it up with online forums, white boards for interaction
• Generate and define research projects (PhD and MSc engineering / ME)
• Identify major bottlenecks and R&D needs.
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To know more, Contact:
ProSIM R&D Pvt. Ltd.,
#4, 1st ‘B’ Main, 1st ‘N’ Block,
Rajajinagar, Bangalore – 560010 , India
Web: www.pro-sim.com
Email: [email protected]
Phone: +91-80- 233 230 20 / 412 777 92 / 412 777 93