Material and structural design based on biological information using optimized stress distribution

ABSTRACTIn order to evaluate the practical strength of a joint and its fracture mode, it is important to find the stress distribution near the edge of the interface by analyses of strength and fracture. The index of stress singularity based on theoretical analysis is a useful tool to indicate the stress distribution.In this paper, investigations on the evaluation of the practical strength of bonded dissimilar materials based on the stress singularity are carried out. The secant stiffness module, which was used for plastics analysis, was applied to the evaluation of thermal elastoplastic behavior near the interface. Spherical conditions of the interface shape were used for the evaluation of stress behavior and the experiment of bonding strength. The relationship between the index of stress singularity, λ, and the practical strength of the bonded TiB2-Ni system was investigated by comparing theoretical λ, which was determined by substituting the secant stiffness module into Bogy's eigenequation, with the practical strength in the edge angle of the interface between 60° and 90° The correlation factor of the relationship between λ and the practical bonding strength of the TiB2-Ni system was found positive. These results show that the structural design of a geometrical interface which is getting a higher strength joint based on the index of stress singularity is verified experimentally.

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Optimization of Orthotropic Laminates

Journal of Engineering for Industry ◽

10.1115/1.3610064 ◽

1967 ◽

Vol 89 (3) ◽

pp. 399-402 ◽

Cited By ~ 10

Author(s):

L. Fischer

Keyword(s):

Stress Distribution ◽

Structural Design ◽

Single Layer ◽

Design Criteria ◽

Shear Stresses ◽

Stress Strain ◽

Mathematical Procedure ◽

Optimum Structural Design ◽

Interaction Equation

Stress-strain relationships for a single layer are used to obtain the stress distribution in a laminate composed of any number of orthotropic layers subjected to axial and shear stresses. The mathematical procedure is simplified for an isotropic laminate. An interaction equation is presented to predict failure of a laminate. Optimum structural design criteria are obtained by considering different combinations of layer orientations.

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Study on Fengdu Second Yangtze River Bridge the Cable Anchorage Structure in a Girder Transfer Mechanism

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.291-294.2320 ◽

2011 ◽

Vol 291-294 ◽

pp. 2320-2323

Author(s):

Xie Dong Zhang ◽

Jin Zhi Wang ◽

Xiao Dong Wang

Keyword(s):

Stress Distribution ◽

Structural Design ◽

Yangtze River ◽

Analysis Method ◽

Analysis Software ◽

Design Load ◽

Cable Stayed Bridge ◽

Plane Analysis ◽

General Plane ◽

The Common

The cable anchorage region in a girder is the key part of cable stayed bridge， in which stress distribution is rather complicated. A general plane analysis method is hard to reflect actual stress status. According to the design of Fengdu Second Yangtze River Bridge In this paper, the analysis of the spatial stress distribution of the cable anchorage structure in a girder is carried out in design load by making use of the common analysis software-Midas FEA and spatial finite element method, the verification and assessment of Fengdu Second Yangtze River Bridge Anchor Plate rational structural design is conducted, in order to put forward optimize the design suggestions, to ensure that such structures the realization of economy and reliability.

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A Finite Element Analysis in Structural Design of Wall-Troweling Robot

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.325-326.1083 ◽

2013 ◽

Vol 325-326 ◽

pp. 1083-1086

Author(s):

Yu Ming Han ◽

Mei Jing Guo

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Stress Distribution ◽

Static Analysis ◽

Structural Design ◽

Research Effort ◽

Virtual Prototype ◽

Element Analysis ◽

The Finite Element Analysis ◽

Design And Manufacturing

The troweling of wall space is an essential decorative process and the development of wall-troweling robots, which are expected to release labors from the burdensome pargeting tasks, is growing to be a promising sector in todays architectural industry. In this paper, a static analysis is conducted for the key components of troweling disk and vertical guiderail, based on the proposed virtual prototype of wall-troweling robots. The stress distribution across these components provides a sound basis for the structural design. With the finite element analysis module of SolidWorks package, the paper investigates the modal characteristics of the key components operating under practical conditions. The research effort in this paper is contributive to the design and manufacturing of wall-troweling robots.

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Structural Design and Analysis of Thrust Collar in Main Wind Turbine Speed-Increasing Gearboxes

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.86.717 ◽

2011 ◽

Vol 86 ◽

pp. 717-720

Author(s):

Qing Qi Xiang ◽

Min Li ◽

Yue Chun Zhang ◽

Hong Bo Zhou

Keyword(s):

Stress Distribution ◽

Wind Turbine ◽

Structural Design ◽

Design Method ◽

Turbine Speed

Analysis has been made on the structure of thrust collar adaptedin main wind turbine gearboxes and a new design method for the thrust collar has been proposed. In addition, we presented a model of thrust collar which allows us to compute the stress distribution. It is showed that the design method is a practical one in thrust collar project of the main wind turbine gearboxes.

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The Stress Distribution and Influence of VDMOS Device Based on ANSYS

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.981.936 ◽

2014 ◽

Vol 981 ◽

pp. 936-939

Author(s):

Jing Hua Yin ◽

Shu Ting Gao ◽

Ming Hua Chen

Keyword(s):

Stress Distribution ◽

Structural Design ◽

Empty Space ◽

Structure Design ◽

Bonding Layer ◽

Three Dimension ◽

Heat Conductivity Coefficient ◽

Stress Effects ◽

Finite Element Software ◽

Micro Deformation

In this paper, the device of VDMOS packaged in a TO-220C power is acted as research object. ANSYS finite element software simulation is used to build the three dimension model, the software is also used to imitate the stress distribution under the frequency of 220Hz ~ 400Hz. The simulation result shows that the stress of the chip of corresponding to the empty space is bigger than the others as the increasing frequency on the boundary of bonding layer and the chip, which easily leads to micro deformation of the bonding layer and the micro crack of the chip. The value of stress effects by changing the bonding layer material and layer thickness, the simulation results show that the bigger heat conductivity coefficient and the thinner thickness of bonding layer is the smaller stress, Which the design of the bonding layer can be optimized. The results of the study provide the theoretical basis for the structural design of the device, founding the weakness of structure design, having guiding significance for improving the reliability of the device.

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The concerted use of SEM, TEM, and SCM for examination of resin-dentin interfaces

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100170116 ◽

1994 ◽

Vol 52 ◽

pp. 476-477

Author(s):

B. Van Meerbeek ◽

L. J. Conn ◽

E. S. Duke

Keyword(s):

Surface Layer ◽

Stress Distribution ◽

Phosphoric Acid ◽

Bonding Mechanism ◽

Restorative Dentistry ◽

Dental Adhesive ◽

Low Viscosity ◽

Dentin Adhesives ◽

Acid Etch ◽

Tooth Tissue

Restoration of decayed teeth with tooth-colored materials that can be bonded to tooth tissue has been a highly desirable property in restorative dentistry for many years. Advantages of such an adhesive restorative technique over conventional techniques using non-adhesive metal-based restoratives include improved restoration retention with minimal sacrifice of sound tooth tissue for retention purposes, superior adaptation and sealing of the restoration margins in prevention of caries recurrence, improved stress distribution across the tooth-restoration interface throughout the whole tooth, and even reinforcement of weakened tooth structures. The dental adhesive technology is rapidly changing. An efficient resin bond to enamel has already long been achieved. Its bonding mechanism has been fully elucidated and has proven to be a durable and reliable clinical treatment. However, bonding to dentin represents a greater challenge. After the failures of a dentin acid-etch technique in imitation of the enamel phosphoric-acid-etch technique and a bonding procedure based on chemical adhesion, modern dentin adhesives are currently believed to bond to dentin by a micromechanical hybridization process. This process is developed by an initial demineralization of the dentin surface layer with acid etchants exposing a collagen fibril arrangement with interfibrillar microporosities that subsequently become impregnated by low-viscosity monomers. Although the development of such a hybridization process has well been documented in the literature, questions remain with respect to parameters of-primary importance to adhesive efficacy.

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