0 Standardization on Mechanical T Safety and Reliability of Structures – Instrumented Indentation Department of Materials Science and Engineering, Seoul National University, Seoul, Korea Young-Cheon Kim, Seung-Kyun Kang, Hee-Jun Ahn, Dongil Kwon May 24, 2011
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Standardization on Mechanical Testing for Safety and Reliability of Structures
– Instrumented Indentation
Department of Materials Science and Engineering, Seoul National University, Seoul, Korea
Young-Cheon Kim, Seung-Kyun Kang, Hee-Jun Ahn, Dongil Kwon
May 24, 2011
1
Contents
::: I. Introduction▪ NMMRL & FRONTICS▪ Instrumented Indentation Test (IIT)
::: II. Evaluation of Mechanical Properties Using IIT
::: III. Standardizations & Activities▪ International Standardizations▪ Activities
1987, Ph.D., Materials Science & Eng., Brown University1981, M.S., Metallurgical Eng., Seoul Nat’l University1979, B.S., Metallurgical Eng., Seoul Nat’l University
Positions Held2008-2009, Ministerial Advisor in the Korean Ministry of
Education, Science and Technology2003, Visiting Professor, Massachusetts Institute of Technology1994~present, Professor, Seoul National University1990-1994, Associate Professor, Changwon National University1989-1990, Senior Researcher, KRISS1988-1989, Invited Researcher, Max Planck Institute
Research Areas
Ø Non-destructive evaluation of mechanical properties (In-situ & in-field evaluation)
Ø Evaluation of mechanical properties at various environmental conditions
Ø Investigating for mechanical behavior inmicro/nano scale
Ø Assessment of reliability of devices & products
3
FRONTICS
FRONTICS Inc.
High/low temperature chamber system(2007)
AIS compact (2009)
AIS 1000 AIS 2000
AIS 2100 (2003)
AIS 3000 m - AIS n - AIS
2000 2003 2008 2009
Fast & Precise Solutions for Quality & ReliabilityDigital Valley, Gasan-dong, Geumcheon-gu, Seoul, KoreaTEL : 82-2-884-8025 http://www.FRONTICS.com
Foundation1st AIS sellingNT certification
1st oversea sellingISO/ASTM memberKS, KEPIC code
ISO/TR 29381New Tech. awardLaunching n-AIS
ASME TFTMove to digital valley50 machines selling
4
MultiscaleCombined Environment
Simple Procedure
Smart Analysis
Selective Diagnosis
• Temperature• Pressure• Corrosion
• Macro• Micro• Nano
Center for Multi-scale Testing and Assessment at Combined Environment
Comparison of Indentation vs Hole-drilling vs Saw-cutting results(API X65)
-200
-150
-100
-50
0
50
100
150
200
250
-50 0 50 100 150 200 250
Distance from welding center line (mm)
Res
idua
l str
ess
(MPa
)
Indentation
Hole-drilling
Saw-cutting
Evaluation of Residual Stress for API X65
28
¡ Place: LG Electronics Inc. (April 2006)¡ Object: Residual stress measurement for fine tube (silver brazing)¡ Material: Copper¡ System: Nano/Micro indentation system¡ Remark: Comparison of residual stress with normal and failure specimen
Schematic diagram
Out dia.=20mm,t=2mm
Out dia.=2mm, t=1mm
Silver brazing
Nano / Micro Indentation system
Analysis of Damaged Cause for Cu Pressure Vessel (1)
29
0 4 8 12 16 20 24 28-200
0
200
400
600
800
1000
Resi
dual
stre
ss (M
Pa)
Distance (mm)
Normal specimen Failure specimen
σh (Circumferential stress)
σa (Longitudinal stress)t
r
Resisting pressure: P
tpr
a 2=s
ah tpr ss 2==
Longitudinal stress:
Circumferential stress:
Failure
Indentation result
Max. residual stress
- Normal specimen: 423.48MPa
- Failure specimen: 859.89MPa
Failure to vertical direction of circumferential stress
Failure region
Analysis of Damaged Cause for Cu Pressure Vessel (2)
30
Advanced Indentation System
FRONTICS
Fast & Precise Solutions for Quality & ReliabilityGasan-dong, Geumcheon-gu, Seoul, KoreaTEL : 82-2-884-8025 http://www.FRONTICS.com
¡ Place: Kori nuclear power plant (January, 2002)¡ Object: Kori No.1 main cooling water line of nuclear power plant (Dia:12 in)¡ Condition: Operating Temperature: 60℃,/90° pipe of elbow type ¡ Material: ASTM A106 B (base metal), AWS E7016(weld metal)¡ Attachment: Chain system¡ Remarks: Mechanical Properties of base material, weldment and HAZ for main cooling
water line of nuclear plant aged more than 20 years
Welded Joint
37
Testing spots
#2
#9
•AWS E7016: Y(410MPa), UTS(530MPa) All-weld-metal tensile test
¡ Place: GE Power System (May, 2003)¡ Object: Natural Gas Line (Mexico Guadalajara)¡ Condition: Evaluation of tensile properties of underground pipeline¡ Material: API X42, X52, X60¡ Attachment: Curvature magnet system¡ Remark: Evaluation of tensile properties of pipeline of removed coating material
Oil & Gas
39
¡ Place: Casper, WY, US – Shell (August, 2007)¡ Object: 7.625 inch Freeze Tubes¡ Condition: Non-destructive Yield Testing of 7.625 inch Freeze Tubes¡ Attachment: U-block system¡ Remarks: Evaluation of yield strength for oil & gas-pipeline (Casper, WY, US) in Shell
Sample
Attachment
Testing position
Oil & Gas
40
Yield strength of different heats
0
5
10
15
20
25
30
35
40
45
Heater number
Yie
ld s
tren
gth
(Ksi
)
Mill test NDE section 1 NED section 2NDE section 3 NDE section 11 NDE section 12
Limited
Oil & Gas
41
¡ Place: Korea Gas Corporation (December, 2001)¡ Object: Testing of weld specimen for API 5L¡ Condition: Evaluation of tensile properties of micro-region at welding depth¡ Material: API 5L X65 [parts of pipeline at 30 in]¡ Attachment: Micro-positioning stage¡ Remark: Sample test of weldment cross-section