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Failure of resistance spot welds | Fracture of solids | PEM Fuel cell | Bio-medical engineering | Structure joints
Research in Professor Chao¡¦s Group -Fracture
Mechanics
Transferability and Constraint Effect in Fracture:
To study the effect of
geometry and loading configuration on the fracture of solids
under both static and dynamic loading conditions. It is one
step beyond the conventional single parameter
fracture theory, e.g. KIC ,
JIC, J-R concept. We investigate the effect
of "constraint" on the fracture toughness, energy release rate,
crack curving, stable crack growth, non-uniqueness in slip-line
fields, cleavage fracture (shallow vs. deep crack; size effect),
creep, J-R curve characterization, fatigue crack growth, and
dynamic fracture toughness. Outcomes from these studies could
(a) provide theoretical basis for a two parameter fracture
toughness engineering testing procedure, and (b) establish the
procedures for transferability of fracture toughness values from
laboratory to structures.
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Representative
Publications
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Kim, Y. and Chao, Y.J., ¡§Effect of
Loading Rate on Dynamic Fracture Initiation Toughness of Brittle
Materials, ¡§ International Journal of Fracture, Jan 20,
2007.
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Chen, Zong-An, Zhen, Zeng, and Chao,
Yuh J., ¡§Effect of Crack Depth on the Shift of the
Ductile-Brittle Transition Curve of Steels,¡¨ Engineering
Fracture Mechanics, 74 (2007) 2437-2448.
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Chao, Y.J., Ward, Jr, J.D. and
Sands, R.G., ¡§Charpy Impact Energy, Fracture Toughness and
Ductile-Brittle Transition Temperature of Dual-Phase 590
Steels,¡¨ Materials and Design, 28, 551-557, 2007.
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Lam, P.S., Kim, Y. and Chao, Y.J.,
¡§The Non-Constant CTOD/CTOA in Stable Crack Extension under
Plane-Strain Conditions,¡¨ Engineering Fracture Mechanics, 73,
1070-1085, 2006.
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Chao, Y.J. and Zhu, X. K., ¡§Specimen Size Requirement for
Two-Parameter Fracture Toughness Testing,¡¨ International
Journal of Fracture, 135:117-136, 2005.
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Kim,
Y. and Chao, Y.J., ¡§Prediction of stable crack growth in surface
cracked plate of Aluminum 7050 alloy,¡¨ International Journal of
Fracture, 130: 583-600, 2004.
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Liu, S., Chao, Y.J. and Zhu, X.,
¡§Tensile-Shear Transition in Mode I/III Fracture¡¨, International
Journal of Solids and Structures, Vol. 41/22-23, 6147-6172,
2004.
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Chao, Y.J., Zhu, X., Kim, Y.,
Pechersky, M.J., and Morgan, M.J., and Lam, P.S.,
¡§Characterization of Crack-Tip Field and Constraint for Bending
Specimens under Large-Scale Yielding¡¨, International Journal of
Fracture, 127, 283-302, 2004.
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Kim, Y., Chao, Y.J., Pechersky, M.
J. and Morgan, M. J., ¡§C-Specimen Fracture Toughness Testing:
Effect of Side Grooves and h Factor,¡¨ ASME Journal of Pressure
Vessel Technology, 126, 293-299, 2004.
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Liu, S. and Chao, Y.J., ¡§Variation
of Fracture Toughness with Constraint,¡¨ International Journal of
Fracture, 124 (3-4): 113-117, 2003
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Hydrogen Embrittlement
of Structural Steels :
Hydrogen or
Helium trend to make structural steels brittle over time.
Working with Savannah River National Laboratory, we study how this
environment affects the fracture toughness values of materials.
Representative
Publications
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Kim, Y., Chao, Y.J., Pechersky, M.
J. and Morgan, M. J., ¡§On the Effect of Hydrogen on the Fracture
Toughness of Steels,¡¨ International Journal of Fracture, 134,
339-347, 2005.Kim, Y.,
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Chao, Y.J., Morgan, M.J. and Lam,
P.S., ¡§Comparison of Decoupled and Coupled Analyses for Hydrogen
Transport in Fracture Specimens,¡¨ Proceedings of PVP2007, 2007
ASME Pressure Vessels and Piping Division Conference, July
22-26, 2007, San Antonio, Texas.
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Kim, Y., Chao, Y.J., M.J. Pecherskey and M.J. Morgan,
¡§Investigation of Hydrogen Transport Related Fracture in
Stainless Steels,¡¨ IMECE2006-13823, Proceedings
of IMECE2006, 2006 ASME International Mechanical
Engineering Congress and Exposition, November 5-10, 2006,
Chicago, Illinois, USA.
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Other Links:
J-A2
Fracture Concept (written by Dr. G.P. Nikishkov)
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