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Reports Outline Applied Fracture Mechanics Findings from Hunan University (Emission criterion of a screw dislocation near a semi-infinite wedge crack...

September 9, 2014



Reports Outline Applied Fracture Mechanics Findings from Hunan University (Emission criterion of a screw dislocation near a semi-infinite wedge crack partially penetrating a nanoscale piezoelectric inhomogeneity with interface effect)

By a News Reporter-Staff News Editor at Journal of Technology -- Current study results on Applied Fracture Mechanics have been published. According to news reporting out of Changsha, People's Republic of China, by VerticalNews editors, research stated, "The electro-elastic interaction between a piezoelectric screw dislocation and a semi-infinite wedge crack partially penetrating a circular nanoscale piezoelectric inhomogeneity is investigated. Using Riemann-Schwartz's symmetry principle integrated with the analysis of singularity of complex functions and the conformal mapping technique, the expressions of electro-elastic fields in matrix and inhomogeneity regions are derived explicitly."

Our news journalists obtained a quote from the research from Hunan University, "The image force, the stress intensity and electric displacement intensity factor of crack tip, as well as the critical applied stress and the critical electric displacement intensity factor for dislocation emission are discussed in detail. The results show that the positive piezoelectric screw dislocation can reduce the stress intensity factor of the wedge crack tip and shield the crack growth. If the coupling of electric displacement and positive stress at the interface is considered, the shielding effect will increase and the situation of image force will change. The most probable angle for dislocation emission is zero, and the greater the shear modulus and piezoelectric constant of the matrix, the greater the wedge crack opening angle, the more difficult for dislocation emission."

According to the news editors, the research concluded: "In addition, the positive (negative) interface stress blocks (boosts) dislocation emission, and the existence of electric displacement at the interface makes dislocation emission more difficult."

For more information on this research see: Emission criterion of a screw dislocation near a semi-infinite wedge crack partially penetrating a nanoscale piezoelectric inhomogeneity with interface effect. Theoretical and Applied Fracture Mechanics, 2014;70():83-90. Theoretical and Applied Fracture Mechanics can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Theoretical and Applied Fracture Mechanics - www.elsevier.com/wps/product/cws_home/505665)

Our news journalists report that additional information may be obtained by contacting Y.B. Zhang, Hunan Univ, Coll Mech & Vehicle Engn, Changsha 410082, Hunan, People's Republic of China. Additional authors for this research include Q.H. Fang and Y.W. Liu.

Keywords for this news article include: Changsha, People's Republic of China, Asia, Applied Fracture Mechanics

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Journal of Technology


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