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Oct, 2015

Hyundai engineering and construction had engaged UTC for forensic investigation of tower crane collapse.


Sept, 2015

UTC completed investigation on breakage of heavy duty manhole frameset.


Aug, 2015

UTC conducted failure analysis on medium duty manhole frameset.


Jul, 2015

In the evening of July 7, 2015, the entire North-South and East-West lines crippled, which affected an estimated 250,000 commuters, was caused by a series of power trips along both lines.

Three weeks later (29, July), LTA and SMRT released their findings that salty deposits triggered the incidents, with the help of experts from Parsons Brinckerhoff and Meidensh. They coincided with the views of our Chief Consultant Dr George, YU Yonghe.

Just days after the incidents, Dr YU told The Straits Times that deposits on 3rd rail insulator were the root cause of the incidents. After near 30 years of usage, the 3rd rail insulator surfaces are covered with a layer of deposits that consist of mainly graphite dusts and foreign substances/ contaminants, which may build an easy path for electricity to cross over the insulator surface, resulting in current leakage from the 3rd rail to its supporting metal brackets, especially when moisture and water are involved. When the leakage current in the 3rd rail insulator exceeds certain level, it will activate the protection device and trigger the power trip, resulting in MRT disruption.

Dr YU's views were published at TOP OF THE NEWS of Straits Times(A4) on 30 July, 2015.

PUB (ex-Public Utilities Board) awarded UTC one year contract for conducting a series of detailed failure analysis projects.


Jun, 2015

UTC was awarded project "Failure Analysis on Braking assembly damage" by Republic of Singapore Air Force (RSAF).


May, 2015

Ministry of Defence awarded UTC for failure analysis on brace structure fracture.


Apr, 2015

UTC was invited and attended 8th Conference on Venture and Innovation (Nanjing).


Mar, 2015

Our Chief Consultant Dr George, YU Yonghe had visited the site of LRT electrical fire and made his assessment.

Dr YU shared his views on the incident - "The electrical fire was caused by electrical arcing, which produced high temperature and much heat and ignited the surrounding combustible substances, resulting in the fire".

The views are consistent/conincide with those on news reported months later.


Feb, 2015

UTC was engaged by China Taiping Insurance for technical litigation related to accidents.


Jan, 2015

UTC was awarded three years contract for conducting failure analysis and forensic accident investigation by Singapore Civil Defence Force (SCDF).


Dec, 2014

Dr YU Yonghe was elected to be Executive Committee member of The Institute of Materials (East Asia).


Nov, 2014

UTC published “Enhancing transportation reliability through effective failure analysis” in Conference of ASEAN Federation of Engineering Organizations 2014 (CAFEO32), (Yangon, Myanmar), 10-13 November 2014
 

Technical litigation on crane collapse.


Assessment on gas pipe leakage.
 
 
Oct, 2014

UTC's Chief Technologist visited European Space Agency (Paris, France).
 
UTC collaborated with Institution of Engineers, Singapore (IES) to conduct technical training course.
 
Sep, 2014

UTC's Executive Director met CEO of Job Safety Solution Ltd (China) for strategic collaboration in safety and accident investigation.
Failure analysis on gearbox damages
 
Aug, 2014

UTC's Chief Consultant conducted course “Failure Investigation and Analysis” for Republic Singapore Air Force (RSAF).
 
Technical litigation and court assistance on crane accident.
 
Jul, 2014
 
UTC's Chief Technologist gave a technical talk “Aircraft Certification” to Aviation Industry Cooperation of China (AVIC) Commercial Aircraft Engine Company Limited,
 
Jun, 2014

UTC's Chief Consultant, as Expert/Technical Assessor, joined Singapore Accreditation Council (SAC) audit team and conducted assessment on Intertek Lab in Rolls Royce (S) for Singapore Laboratory Accreditation Scheme (Singlas).
 
Investigation on crane toppling accident
 
May, 2014
 
Condition assessment on ship propeller damages


Selected Publications
 

International Conferences


Enhancing transportation reliability through effective failure analysis, Conference of ASEAN Federation of Engineering Organizations 2014 (CAFEO32), (Yangon, Myanmar), 10-13 November 2014

Challenges in Developing a Light Weight Passenger Seat, Singapore Aerospace Technology & Engineering Conference 2014, Singapore

Investigation on fracture of Maraging 300 steel tie rod, 5th International Conference on Engineering Failure Analysis, The Hague, Netherland (1-4 July, 2012)

Application of mechanics in aviation industry, The cutting edge research and industry application of computational mechanics, Application for Computation Mechanics & Theoretical and Applied Mechanics Society Symposium (Singapore) , April 2012

Improving safety and reliability through effective failure analysis, 6th Conference on reliability, Asset Management and safety Kuala Lumpur, Malaysia (24-25, Sept. 2012)

Effective failure analysis, Certification & Inspection Conference: ‘Product & System Assurance for a Safer Tomorrow’, Singapore, 13 Sept. 2012

Fatigue Study in Helicopter Under-slug Operation, CAFEO, 27-30 November 2011, Brunei

Continued Education for Aviation Engineers, Inaugural Federation of Engineering Institutions of Asia and the Pacific (FEIAP) Convention 2011, Singapore 

PZT films grown on nickel substrate by pulsed laser deposition, Materials Science & Technology 2007 (MS&T’07), MST0307-2007, Detroit, USA (2007).

Failure analysis on cracking of ship-lifting system, Materials Science & Technology 2007, Detroit, USA (2007)

Measurement on elastic constants of thin films by Synchrotron X-ray diffraction, The 4th international Conference on Materials for Advanced Technologies (ICMAT07), Conf116a2326, Singapore (2007).

Using Hole Cold Working as A Fatigue Improvement Modification, Aerospace Technology Seminar, March 2007 Singapore

Finite Element Modelling of Super Puma, Aerospace Technology Seminar, March 2007, Singapore

Surface Engineering for Aerospace Industry Applications, Singapore Surface Finishing Society Symposium, Dec. 2006

Residual stresses of thin films measured by high resolution rocking curve technique, 1st International Symposium on Functional Materials, Kuala Lumpur, Malaysia (Dec. 2005)730-736

Measurement of elastic constants of thin films by XRD coupled with four-point bending technique, 2nd International Conference on Technological Advances of Thin Films & Surface Coatings, 34-GEN-951, Singapore (July, 2004)

Flight Loads Validation through Flight Test for a Specific Manevruor, Aerospace Technologies Seminar, Sept. 2001, Singapore

Growth of potassium lithium niobate (KLN) single crystals for second harmonic generation (SHG) application, National Conference on Crystal Growth, Shanghai, China (2000)

Numerical analysis for J integral of subinterface crack, 8TH International. Conf. on Fracture, Kiew, Ukraine(June, 1993)

Numerical Analysis Techniques for New BEMs of Arbitrary Plates and Shells, International Conference on CME'92, Nov. 11‑13, 1992, Singapore

Analytical Methods in Simplifying New BEM for Elastic Thin Shells, Proceedings of 4th National Conference on Weighted Residual Technique, 1992, Wuhan, China

Improvements on stress relaxation resistance of low carbon martensite, Proc. of 6th Inter. Conf. on Mechanical Behaviour of Materials, Japan (1991)

A New Approach to BEM of Elastic Thin Plates, Proceedings of 4th China ‑ Japan Symposium on Boundary Element Methods, Oct.1-5, 1991, Beijing, P. R. China

Numerical Calculation of Cauchy Principle Integrals and High Order Singular Integrals, Proceedings of 3rd  East‑China Conf. on Computation Mechanics, Oct. 1991, Huangsan, China

ψ-splitting in measuring residual stress of curvature by XRD, Proc. of 4th Int. Conf. on Shot Peening, Japan (1990) 373‑378

Hydrogen brittlement fracture analysis for ball stud of steering drag link, Proc. of  5th National Conf. on Machinery Failure Analysis, China (1989) 26‑27

The effect of shot peening on Strain‑controlled fatigue behaviors, Proc. of 4th Inter. Conf. on Shot Peening, Japan (1990) 411‑418

Error analysis for x‑ray stress measurement at the notch, Proc. of ICRS-2, France, (1988) 123‑129

Shot Peening on Torsion Fatigue, Proc. of 3th Inter. Conf. on Shot Peening, Germany (1987) 619‑624

Measurement of notch residual stress fields produced by shot peening, Proc. of Japan & China Conf. on Shot Peening, Nanjing, China (1987)

 Boundary Element Method for 2 ‑ D Transient Elastodynamics, Proceedings of the Beijing International Conference on BEM, Beijing, China, 1986.

Methodology and warm prestressing effect for pressurized thermal shock analysis in nuclear power plant, Proceedings of 2014 International Symposium on Structural Integrity, 49-58. 2014 International Symposium on Structural Integrity (invited keynote speaker), August 20-24, 2014, Lanzhou, China.

Probabilistic pressurized thermal shocks analysis for a reactor pressure vessel. 2014 ASME Pressure Vessel and Piping Division Conference, July 20-24, 2014, Anaheim, California, USA.

Constraint effects for a reactor pressure vessel subjected to pressurized thermal shock. 20th European Conference on Fracture (ECF20), June 30- July 4, Trondheim, Norway.

Investigation on constraint effect of a reactor pressure vessel subjected to pressurized thermal shocks. 2013 ASME Pressure Vessel and Piping Division Conference, July 14-18, 2013, Paris, France.

Crack propagation mechanism and life prediction for very-high-cycle fatigue of a structural steel in different environmental medias. Fracture and Structural Integrity, 2013 (25) 7-14. 2nd IJFatigue & FFEMS joint conference: characterization of crack tip stress fields. Malaga, Spain, April 15-17, 2013.

Probabilistic assessment of pipelines containing corrosion defect with correlated input parameters based on FITNET FFS procedure. Proceedings of the 1st international conference of the international journal of structural integrity, 2012.

Deterministic and probabilistic analysis of a reactor pressure vessel (RPV) subjected to pressurized thermal shocks (PTS). The Hague, the Netherlands, 5th International Conference on Engineering Failure Analysis, 2012.

Investigation of high cycle and very-high-cycle fatigue behaviours for a structural steel with smooth and notched specimens. Dresden, Germany, 18th European conference on Fracture, Aug., 2010.

Experiment and simulation of Very-High-Cycle fatigue behaviour for low alloy steels. Proceedings of the12th international conference on fracture, 2009.

Experimental investigation of Very-High-Cycle fatigue behaviour for a structural steel. Advances in Heterogeneous Material Mechanics 2008, 1199-1202.

Experimental Investigation of Very-High-Cycle Fatigue Behaviour for a Structural Steel. 2rd International Conference on Heterogeneous Material Mechanics. Huangshan, China, Jun., 2008.

Very high cycle fatigue study for a medium carbon low alloy steel. CCTAM, Beijing, China, Aug., 2007.

Fractography and Crack Initiation of Very-High-Cycle Fatigue for a High Carbon Low Alloy Steel. International Conference of Fracture Damage Mechanics, Harbin, China, Sept., 2006.

 

International Journals

Measurement of thin film piezoelectric constants using X-ray diffraction technique, Physica Scripta, T129(2008)353-357

Measurement on elastic constants of thin films by Synchrotron X-ray diffraction, Advances in of Synchrotron Radiation, DOI: 10.1142/S1793617908000288 V.01(2008)179.

Distribution in orientation axis of thin films grown by pulsed laser deposition, Thin Solid Films, DOI: 10.1016/j.tsf.2007.04.150 (2007)

Measurement of X-ray stress elastic constants of thin films, J of Smart Structure Materials, 16(2007)487-492

Highly (100) oriented PZT/LNO films grown on amorphous substrates by pulsed laser deposition, J. Applied Physics A, DOI: 10.1007/s00339-007-3968-y, A88(2007)365-370

Residual stresses of PZT thin films measured by synchrotron radiation, J. of Alloy and Compounds, DOI: 10.1016/j.jallcom.2006.02.109 (2007)

Measurement of elastic constants of crystalline solid films by XRD coupled with four-point bending technique, Surface and coating Technology, 200 (2006)4006-4010

Bi-axial aligned LNO thin films grown on SiO2 surface by PLD, submitted to J. Crystal Growth

Gap filler and brazing temperature on fracture and fatigue of wide gap brazed joint,  J. of  Materials Science, 30(1995)2101-2107

Fracture and fatigue of wide gap brazed stainless steel, J. of the Institute of Engineers (Singapore),34, No.6(1994)91-95

Wide gap brazing of stainless steel with nickel-based eutectic filler metals, J of The Institute of Materials (East Asia), 2, No.2(1993)75-80

Comparison on strengthening methods for crankshaft, J of Automobile Technology & Materials, No4 (1992) 1-4

Improvements on stress relaxation resistance of low carbon martensite, J of Light Automobile Technology, No3(1992) 39-42

BEM for Arbitrary Elastic Thin Shells, Acta Mechanica Sinica (English Edition), 1992, No.4, pp355-362

Exploring on Deformation Analysis of Convex Continuous Solids by Image Reconstruction Method, J. of  Mechanical Strength (in Chinese) 1992, No.2,  pp1-6

Research on Establishing BEM of Various Plates with Kelvin's Fundamental Solution,  J. of Solid Mechanics Sinica,(English Edition),1992, vol.5, No.3, pp-311-321

Integral Equations Derivation of BEM for Plates and Shells, J of Southeast University, vol. 22, 1992, No. 6, pp 58~64

Fatigue performance study for medium carbon steels, J. of Light Automobile Technology, No.2,(1989) 34‑42

Error analysis for x‑ray stress measurement at the notch, J. of Physical Testing (In Chinese) 25, No3(1989)30‑34

Measurement of notch residual stress fields produced by shot peening, J. of Light Automobile Technology, No.5(1987)77‑81

Dynamic Stress Concentration Factors of the Fibres in Interlamented Hybrid Composites, J. of  Xi'an Jiaotong University, 1983, Vol.17, No.6, pp85‑90

A model to predict S-N curves for surface and subsurface crack initiations in different environmental medias. International Journal of Fatigue, 2015 (71) 35-44.

Investigation on constraint effect of a reactor pressure vessel subjected to pressurized thermal shocks. ASME Journal of Pressure Vessel Technology, 2015 (137) (011204-1)-(011204-7).

Deterministic and probabilistic analysis of a reactor pressure vessel subjected to pressurized thermal shocks. Nuclear Engineering and Design, 2014 (273) 381-395.

Probabilistic PTS analysis of a reactor pressure vessel by considering realistic crack distributions. Nuclear Engineering and Design, 2014 (270) 312-324.

In-plane and out-of-plane constraint effects under pressurized thermal shocks. International Journal of Solids and Structures, 2014 (51) 1311-1321.

Procedures, methods and computer codes for probabilistic assessment of reactor pressure vessels subjected to pressurized thermal shocks. Nuclear Engineering and Design, 2013 (258) 35-50.

Integrity analysis of a reactor pressure vessel subjected to pressurized thermal shocks by considering constraint effect. Engineering Fracture Mechanics, 2013 (112-113) 14-25.

Markus Niffenegger, Wenxing Zhou, Shuxin Li. Effect of correlated input parameters on the failure probability of pipelines with corrosion defects by using FITNET FFS procedure. International Journal of Pressure Vessel and Piping, 2013 (105-106) 19-27.

Probabilistic leak-before-break analysis with correlated input parameters. Nuclear Engineering and Design, 2013 (254) 266-71.

Experimental and theoretical investigation of environmental media on very-high-cycle fatigue behavior for a structural steel. Acta Materialia, 2011 (59) 1321-27.

Probabilistic analysis of pipeline with corrosion defects by using FITNET FFS procedure. Corrosion Science, 2011 (53) 855-61.

Probabilistic fracture assessment of piping systems based on FITNET FFS procedure. Nuclear Engineering and Design, 2011 (241) 714-22.

Investigation of high cycle and very-high-cycle fatigue behaviors for a structural steel with smooth and notched specimens. Engineering Failure Analysis, 2010 (17) 1517-25.

Effects of environmental media on high cycle and Very-High-Cycle fatigue behaviors of structural steel 40 Cr. Acta Metallurgica Sinica, 2009 (45) 1356-63.

Integrity analysis of reactor pressure vessels subjected to pressurized thermal shocks by XFEM. Nuclear Engineering and Design, 2014 (275) 336-43.

XFEM integrity analysis of quasi laminar flaws in a reactor pressure vessel subjected to pressurized thermal shocks. Nuclear Engineering and Design, 2014 (280) 464-72.

Fatigue strength and crack initiation mechanism of Very-High-Cycle fatigue for low alloy steels. Metallurgical and Materials Transactions A, 2012 (8) 2753-62.

Essential characteristics and influential factors for Very-High-Cycle fatigue behavior of metallic materials. Acta Metallurgica Sinica, 2009 (45) 769-80.

Effect of aqueous environment on high cycle and Very-High-Cycle fatigue behavior for a structural steel. Key Engineering Materials, 2011 (462-463) 355-60.

Youshi Hong. Fractography and crack initiation of Very-High-Cycle fatigue for a high carbon low alloy steel. Key Engineering Materials, 2006 (324-325) 1113-16.

Investigation of constraint and warm prestressing effects with a micromechanics model. Engineering Fracture Mechanics (under revision), 2015.

Calibration of Beremin model with the Master Curve. Engineering Fracture Mechanics (under revision), 2015.

Probabilistic pressurized thermal shocks analysis for a reactor pressure vessel. ASME Journal of Pressure Vessel Technology, 2015 (under revision).

Location of initial debonding and stress singularity at interface endAdvanced Materials Research, 2008, 33-37: 315-320.

Predictions of stiffness and strength of Nylon 6/MMT nanocomposites with an improved staggered modelComposites B2008, 39: 1062-68.

Stiffness prediction of nylon 6/caly nanocomposites with a staggered model, Solid State Phenomena, 2007, 121-123: 1443-1445.

Effect of stress singularity on stress distribution and initial debonding of interface end, Key Engineering Materials, 2007, 334-335: 641-644.

Specimen design for IFSS measurement in fiber pullout test, Key Engineering Materials, 2006, 312: 149-154.( 10139826)

The reliability of fragmentation test, Key Engineering Materials, 2006, 312: 155-160.
Re-evaluation of fragmentation test based on the stress singularity of interface end, Composite Interfacs, 2006, 13(1): 67-88.( 0927-6440).

Numerical study of the single fibre push-out test: Part III. Singularity of interface stresses, Composite Interfaces, 2003, 10(1): 17-40.

Transient response of airport runway, Key Engineering Materials, 2003, 243-244: 135-140.

Interface theory and re-evaluation in interfacial strength test methods, Composite interface, 2003, 10(6): 567-580

Micro-crack initiation at tip of a rigid line inhomogeneity in piezoelectric materials, International Journal of Engineering Science, 2003, 41(2), 137 –147.

Exact solution of multi-layered piezoelectric diaphragm, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2003, 50(10): 12621271.