Papers by Keyword: Shear Stress

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Authors: Kurt Wostyn, Tae Gon Kim, Paul W. Mertens, Jin Goo Park
Abstract: When a physical cleaning technology, such as megasonic and high-velocity-liquid aerosol cleaning, is considered for the removal of particles or photo resist residues, damage addition is a major concern. After detection of defects in long gate stack lines by bright field inspection (KT2800), SEM imaging shows they extend over a length in the order of 1μm (Figure 1) [1].
Authors: Alice Noreyan, Vesselin Stoilov
Abstract: In the present study molecular dynamics simulations were carried out to investigate the deformation of pure FCC aluminum and diamond cubic silicon interfaces under shear stress. A second nearest-neighbor modified embedded atom method was used to describe the interactions between Al-Al, Si-Si and Al-Si atoms. The critical shear stress (CSS) was determined for various Al/Si and Al/Al interfaces with different alignments and orientations. Structural analyses show that the deformation is localized at approximately 10 Å thickness of the interface in Al. The critical shear stress of Al/Si interface was found to be significantly lower than the critical tensile stress due to the partial stick-slip in sliding. In addition, it has been proven that there is no explicit relationship between shear and tensile critical stresses, which is fundamentally different from isotropic materials, where the shear stress is about half of the tensile stress. The misorientation has a dramatic effect in reducing shear stress at Al/Al interfaces, but has no effect on CSS in Al/Si. As a result, it was shown that introducing Si improves the strength of the interface (and the composite material in general) for different grain orientations.
Authors: Zhen De Hou, Wei Tian Yi, Lei Yang, Cheng Yue
Abstract: Bone is an anisotropic inhomogeneous material, and its piezoelectric behavior is more complex than mineral piezoelectric materials such as quartz crystal or ceramics. This article aimed to understand the piezoelectric properties of bone by investigating its converse piezoelectric effect. Bending deformation of bone specimens subjected to an external electric field was observed. Displacements or deflections of bone cantilever beams were measured by a high resolution digital microscope combined with digital image correlation technique. In order to demonstrate the validity of the experiment, specimens made of non piezoelectric materials were also tested in the same experimental condition as bone. The results indicate that the bending deformation of the bone cantilever may come from the non uniform piezoelectric properties of bone, compared to an analytical solution.
Authors: Yan Ru Li, Hai Bo Jiang, Zhong Qing Cheng
Abstract: The calculations of the elastic modulus and the internal stresses of the orthogonal symmetric laminated plates are very difficult, so experimental or numerical simulation methods were used generally. This paper proposed an Equivalent Strain Model, which can greatly simplify the derivation process of the analytical formulas. By the Equivalent Strain Model, the elastic modulus formula of two-layer plate was derived, and the formula shows that the elastic modulus of the laminated plate meets to the mixture rule of the cross-sectional area ratio of each its single-layer plate; Other formulas derived show that the stress within each single-layer plate is proportional to its elastic modulus and the external load stress, and is inversely proportional to the elastic modulus of the laminated plate. The formula of the average shear stress between two single-layer plates also was derived. Recursive method can be used for multilayer plate calculations.
Authors: Hai Feng Ji, Chun Fu Gao, Xin Sheng He, Guang Zhang
Abstract: With the purpose of studying the main influence on the cylinder-typed magneto-rheological fluid (MRF) clutch, the relationship between the output of shear stress and its affecting factors is presented in this paper; through theoretical derivation from the Bingham Model and the cylinder-typed shear model, the stress born by the MRF in the clutch is analysed, and the affecting factors on the clutch is also simulated and verified through experiments. The study shows that as the magnetic field strengthens, the shear stress of the cylinder-typed MRF clutch grows linearly, with proportionality constant at 0.162; the increase of shear rate, relevant to the magnetic field strength, makes little difference to the torque output, with proportionality constant at 0.00026B. The results indicate that mechanical-electrical integration of clutch devices can be achieved through the control of magnetic field output of the electromagnet.
Authors: Jia Jing Yuan, Wen Zhuang Lu, Dun Wen Zuo, Feng Xu
Abstract: The contact stress of cemented carbide with NCD coating in elastic contact was analyzed using ANSYS. Factors such as elastic modulus and thickness of NCD film and elastic modulus of interlayer which affect the shear stress distribution of NCD film on cemented carbide substrate were investigated. The results show that the maximum shear stress point moves towards the interface with the increase of film elastic modulus. Film thickness has a significant effect on shear stress distribution of NCD film. High shear stress develops in the film layer with the increase of film thickness. Interlayer with low elastic modulus will cause shear stress concentration in NCD film.
Authors: A.V. Samant, W.L. Zhou, P. Pirouz
Authors: Zhi Sheng Ren, Di Zheng, Li Yong Hu, Chao Bing Huang
Abstract: Rheology is an important property of MRF (Magnetorheological fluids) and an important basis for designing a MRF device. For researchers and engineers, therefore, a practical and reliable magnetorheometer is certainly required for the study and application of the MRF and its devices. In this paper, the principle of a novel magnetorheometer was introduced, the structure and the function of major components were explained, the test process for the rheological property of the MRF by using this magnetorheometer was illustrated, the distribution of the electromagnetic field in the gap, where the MRF is filled, was analyzed by means of ANSYS software tools, and experiments were conducted to ascertain the validity of the magnetorheometer.
Authors: Ye Min Guo, Lan Mei Wang, Rui Yong Xue
Abstract: According to the requirements of measurement of plantar pressure and shear stress in the meantime, this thesis puts forward a plan to construct a new insole plantar pressure and shear stress system based on multifunction data acquisition modular and Lab VIEW. Then the hardware part and software part are designed and developed respectively. There are 3 sensors are arrayed at each measurement point, that means 3 sensors are assembled in 3 different directions of X,Y and Z . The piezoelectric ceramic type sensors are designed, manufactured and calibrated according to scientific methods. Meanwhile, the DAQ card is selected carefully. Of course, the software part is developed based on Lab VIEW. A series of tests are performed in order to validate the function of the measurement system. The results satisfy the anticipated design requirements. At last, the problems and application trend of the measurement system are predicted.
Authors: Da Wei Guo, Xue Wei Bai, Yong Kui Li
Abstract: To measure and detect the shear stress directly in the field, we developed the device. Designed its structure, working principle, technical parameters and selected its material based on the mechanical characteristics of corn stubble in the field we wanted to get. Applied Solid Works software to construct model for it. In this way, people can know about it intuitively. It is able to detect shear stress of corn stubble in the field directly and accurately. Because shear stress is one of the most important theoretical basis for the design of corn stubbles broken to field machine, maize stubbles harvester machine and corn tillage planter, so design of shear stress detection device for corn stubble in this article is very meaningful and promising.
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