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**8cyVn4RJ** · 08-13-2012, 10:38 PM

From Top Science Blogs ‏@topscienceblogs

A pre-crack might propagate or stick under mechanical and electrical loading: (Science in China Press) Electric ... http://tinyurl.com/927xstu

http://www.eurekalert.org/pub_releas...medium=twitter

" A pre-crack might propagate or stick under mechanical and electrical loading

IMAGE: This is a schematic illustration of the hysteresis loops of a crack width versus (a) the applied displacement under a constant applied electric voltage, and (b) the applied electric voltage...
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Fracture under combined mechanical and electric loading is currently a hot research area in the global fracture community, while electric sticking is a major concern in the design and fabrication of micro/nanoelectromechanical systems. Professor ZHANG Tong-Yi and his student, Mr. Tao Xie, from the Department of Mechanical Engineering, Hong Kong University of Science and Technology, found that the two problems are switchable, depending on the loading conditions, sample geometries and material properties. Based on his 20-year research experience on the fracture of dielectric and piezoelectric ceramics, Prof. ZHANG developed a novel pre-cracked parallel-plate capacitor model to analytically investigate the role of electrostatic tractions in fracture and electric sticking behaviors."Prof. ZHANG and Mr. Tao Xie provided a new fracture criterion based on the energy release rate and crack opening. Their work, entitled "Effect of electrostatic tractions on the fracture behavior of a dielectric material under mechanical and/or electric loading", was published in SCIENCE CHINA Technological Sciences, 2012.

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08-13-2012, 10:38 PM	#1
8cyVn4RJ Join Date Oct 2005 Posts 488 Senior Member	any engineers care to try explaining this please? From Top Science Blogs ‏@topscienceblogs A pre-crack might propagate or stick under mechanical and electrical loading: (Science in China Press) Electric ... http://tinyurl.com/927xstu http://www.eurekalert.org/pub_releas...medium=twitter " A pre-crack might propagate or stick under mechanical and electrical loading IMAGE: This is a schematic illustration of the hysteresis loops of a crack width versus (a) the applied displacement under a constant applied electric voltage, and (b) the applied electric voltage... Click here for more information. Fracture under combined mechanical and electric loading is currently a hot research area in the global fracture community, while electric sticking is a major concern in the design and fabrication of micro/nanoelectromechanical systems. Professor ZHANG Tong-Yi and his student, Mr. Tao Xie, from the Department of Mechanical Engineering, Hong Kong University of Science and Technology, found that the two problems are switchable, depending on the loading conditions, sample geometries and material properties. Based on his 20-year research experience on the fracture of dielectric and piezoelectric ceramics, Prof. ZHANG developed a novel pre-cracked parallel-plate capacitor model to analytically investigate the role of electrostatic tractions in fracture and electric sticking behaviors."Prof. ZHANG and Mr. Tao Xie provided a new fracture criterion based on the energy release rate and crack opening. Their work, entitled "Effect of electrostatic tractions on the fracture behavior of a dielectric material under mechanical and/or electric loading", was published in SCIENCE CHINA Technological Sciences, 2012. ... "
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