The Influence of Interfacial and Structural Parameters on the Elastic Modulus of SiCp/6066Al Composites

2007 ◽  
pp. 653-656
Author(s):  
Fu Sheng Pan ◽  
Wen Ming Wang ◽  
Yun Lu ◽  
Su Min Zeng
Keyword(s):  
Elastic Modulus ◽  
Structural Parameters

scholarly journals In Vivo Reconstruction of the Acetabular Bone Defect by the Individualized Three-Dimensional Printed Porous Augment in a Swine Model

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Jun Fu ◽  
Yi Xiang ◽  
Ming Ni ◽  
Xiaojuan Qu ◽  
Yonggang Zhou ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Elastic Modulus ◽  
Bone Defect ◽  
Bone Ingrowth ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Acetabular Bone ◽  
Acetabular Bone Defect ◽  
3D Printed ◽  
Matching Degree

Background and Purpose. This study established an animal model of the acetabular bone defect in swine and evaluated the bone ingrowth, biomechanics, and matching degree of the individualized three-dimensional (3D) printed porous augment. Methods. As an acetabular bone defect model created in Bama miniswine, an augment individually fabricated by 3D print technique with Ti6Al4V powders was implanted to repair the defect. Nine swine were divided into three groups, including the immediate biomechanics group, 12-week biomechanics group, and 12-week histological group. The inner structural parameters of the 3D printed porous augment were measured by scanning electron microscopy (SEM), including porosity, pore size, and trabecular diameter. The matching degree between the postoperative augment and the designed augment was assessed by CT scanning and 3D reconstruction. In addition, biomechanical properties, such as stiffness, compressive strength, and the elastic modulus of the 3D printed porous augment, were measured by means of a mechanical testing machine. Moreover, bone ingrowth and implant osseointegration were histomorphometrically assessed. Results. In terms of the inner structural parameters of the 3D printed porous augment, the porosity was 55.48 ± 0.61 % , pore size 319.23 ± 25.05   μ m , and trabecular diameter 240.10 ± 23.50   μ m . Biomechanically, the stiffness was 21464.60 ± 1091.69   N / mm , compressive strength 231.10 ± 11.77   MPa , and elastic modulus 5.35 ± 0.23   GPa , respectively. Furthermore, the matching extent between the postoperative augment and the designed one was up to 91.40 ± 2.83 % . Besides, the maximal shear strength of the 3D printed augment was 929.46 ± 295.99   N immediately after implantation, whereas the strength was 1521.93 ± 98.38   N 12 weeks after surgery ( p = 0.0302 ). The bone mineral apposition rate (μm per day) 12 weeks post operation was 3.77 ± 0.93   μ m / d . The percentage bone volume of new bone was 22.30 ± 4.51 % 12 weeks after surgery. Conclusion. The 3D printed porous Ti6Al4V augment designed in this study was well biocompatible with bone tissue, possessed proper biomechanical features, and was anatomically well matched with the defect bone. Therefore, the 3D printed porous Ti6Al4V augment possesses great potential as an alternative for individualized treatment of severe acetabular bone defects.

scholarly journals Mechanical properties of blueberry stems

2018 ◽  
Vol 64 (No. 4) ◽  
pp. 202-208
Author(s):  
Margus Arak ◽  
Kaarel Soots ◽  
Marge Starast ◽  
Jüri Olt
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Structural Parameters ◽  
Tensile Tests ◽  
Measuring Instrument ◽  
Test Results ◽  
Average Value ◽  
Agricultural Machines

In order to model and optimise the structural parameters of the working parts of agricultural machines, including harvesting machines, the mechanical properties of the culture harvested must be known. The purpose of this article is to determine the mechanical properties of the blueberry plant’s stem; more precisely the tensile strength and consequent elastic modulus E. In order to achieve this goal, the measuring instrument Instron 5969L2610 was used and accompanying software BlueHill 3 was used for analysing the test results. The tested blueberry plant’s stems were collected from the blueberry plantation of the Farm Marjasoo. The diameters of the stems were measured, test units were prepared, tensile tests were performed, tensile strength was determined and the elastic modulus was obtained. Average value of the elastic modulus of the blueberry (Northblue) plant’s stem remained in the range of 1268.27–1297.73 MPa.

Optimizing the anchoring structure for a super large cable-net structure with improved fatigue resistance

2019 ◽  
Vol 23 (4) ◽  
pp. 657-669
Author(s):  
Wanxu Zhu ◽  
Runhui Sang ◽  
Long Yang ◽  
Huan Lei
Keyword(s):  
Elastic Modulus ◽  
Radio Telescope ◽  
Structural Parameters ◽  
Steel Wire ◽  
High Stress ◽  
Fretting Wear ◽  
Optimized Design ◽  
Element Analysis ◽  
Chill Casting ◽  
Auxiliary Anchor

During its operation, the vast cable-net structure of China’s Five-hundred-meter Aperture Spherical radio Telescope is subject to super high stress amplitude (up to 500 MPa) that the current anchoring structure is unable to bear. As a solution to this problem, this article presents an optimized anchoring structure that includes a main anchor cup and an auxiliary anchor cup. Typically used to compose Five-hundred-meter Aperture Spherical radio Telescope’s cable-net structure, the S3-type cable is selected as the subject of analysis. In addition to anchoring limit and fatigue tests, a finite element analysis is conducted using the software ANSYS to set up a one-sixth three-dimensional high-precision numerical model to examine the contact–slip relationship between the steel wires and the chill casting. The following combination of structural parameters is found for an optimized design of the S3-type cable anchoring structure: auxiliary cup internal inclination angle, 3°; friction coefficient between anchor cup and chill casting, 0.12; and elastic modulus of the chill casting, 36 GPa. This optimal structural setting eliminates fretting wear in the main cup section; instead, fretting wear most likely occurs at the narrow end of the auxiliary anchor cup. When the structure bears the maximum working load, the slip amplitude between the chill casting and the tendons is 25 μm at the narrow end of the auxiliary anchor cup, and the radial compressive stress of the steel wire is −20 MPa. It is determined that this innovative anchoring structure with the S3-type cable boasts excellent static and dynamic load-bearing qualities with the elastic modulus of the cable remaining almost unchanged during the testing processes, which indicates that this anchorage meets the highly demanding requirements of the Five-hundred-meter Aperture Spherical radio Telescope project and offers a prototype to facilitate future anchoring enhancing efforts.

scholarly journals Modeling and analysis of high aspect ratio wing considering random structural parameters

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Bangsheng Fu ◽  
Ya Yang ◽  
Hui Qi ◽  
Jiangtao Xu ◽  
Shaobo Wang
Keyword(s):  
Elastic Modulus ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Structural Parameters ◽  
Torsional Stiffness ◽  
Statistical Characteristics ◽  
Modeling And Analysis ◽  
One Dimensional ◽  
Advanced Composite Materials ◽  
Aeroelastic Model

AbstractWith the application of advanced composite materials in High-Aspect-Ratio wings (HARW), the randomness of structural parameters, such as elastic modulus and Poisson's ratio, is enhanced. Hence, in order to explore the whole picture of aeroelastic problems, it is of great significance to study the role of random structural parameters in aeroelastic problems. In this paper, the dynamic response of flexible HARW considering random structural parameters is analyzed. An aeroelastic model of a one-dimensional cantilevered Euler–Bernoulli beam considering aerodynamic forces acting on the wing is established based on Hamilton's principle. Adopted the idea of simplifying calculation, the effect of random structural parameters is analyzed. Then, considering the elastic modulus and torsional stiffness as continuously one-dimensional random field functions, and discretized by local method. The first and second order recursive stochastic nonlinear finite element equations of wing are derived by using perturbation method. Based on it, statistical expression of aeroelastic effects of the wing is derived. Monte Carlo method is adopted to verify the effectiveness of the method. Numerical simulations indicate that the method proposed can well mirror the statistical characteristics of aeroelastic response.

Effect of Random Material Parameter in the Shell Structures

2013 ◽  
Vol 275-277 ◽  
pp. 1302-1305
Author(s):  
Hyuk Chun Noh
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Elastic Modulus ◽  
Isotropic Material ◽  
Material Parameter ◽  
Structural Parameters ◽  
Shell Structures ◽  
Random Nature ◽  
Good Agreement

The random nature of structural parameters is to affect the behavior of the structure which cannot be detected in the context of deterministic analyses. Taking into account the randomness in the material parameter, we evaluate probabilistic behavior of the shell structures made of isotropic material. Specifically, the elastic modulus is taken to be random since the parameter plays an utmost important role in the behavior of structures. The results of the proposed scheme are compared with those based on Monte Carlo simulation. It is observed that the proposed scheme is in good agreement with the MCS, which shows the adequacy of the proposed scheme.

The Influence of Interfacial and Structural Parameters on the Elastic Modulus of SiCp/6066Al Composites

2007 ◽  
Vol 546-549 ◽  
pp. 653-656
Author(s):  
Fu Sheng Pan ◽  
Wen Ming Wang ◽  
Yun Lu ◽  
Su Min Zeng
Keyword(s):  
Elastic Modulus ◽  
Volume Fraction ◽  
Poisson Ratio ◽  
Structural Parameters ◽  
The Matrix ◽  
Specific Elongation ◽  
Matrix Modulus ◽  
Particulate Volume Fraction ◽  
Optimal Approach ◽  
Particulate Volume

The effects of the interfacial parameters (interface/matrix modulus ratio, interface Poisson ratio and interface volume fraction) and the structural parameters (particulate volume fraction, particulate shape, arrangement pattern and dimensional variance mode) on the elastic modulus of SiCp/6066Al composites were calculated and analyzed. The results showed that component and interface performance significantly influenced the elastic modulus of the composite; but the particulate shape, arrangement pattern and dimensional variance mode were found to have little influence. This means that the effect of the above structural parameters can be negligible. The optimal approach to enhance the elastic modulus and specific elongation of a composite is to improve the interfacial bonding of the particulate. Optimal results are obtained when the interface modulus is 20% ~ 30% of the matrix modulus.

Correlation between Mechanical Properties and Structure in Polymer Gels with Controlled Network Structure

2014 ◽  
Vol 1622 ◽  
pp. 7-16
Author(s):  
Takamasa Sakai ◽  
Yuki Akagi ◽  
Ung-il Chung
Keyword(s):  
Elastic Modulus ◽  
Fracture Energy ◽  
Molecular Design ◽  
Structural Parameters ◽  
Polymer Network ◽  
Polymer Networks ◽  
Network Models ◽  
Polymer Gels ◽  
Reaction Conversion ◽  
First Time

ABSTRACTElastmeric materials are of great importance in both academic and industrial field due to the soft and highly stretchable properties. Thus, many theories and models are proposed to correlate the physical properties and structural parameters. However, in general, it is difficult to validate these models experimentally. Thus, to this day, we do not know the requirement conditions for each model or even the validity of each model. The validation of these models has been inhibited by the inherent heterogeneity of polymer networks.Recently, we, for the first time, succeeded in fabricating polymer network with extremely suppressed heterogeneity with a novel molecular design of prepolymers. The homogeneous polymer network, called Tetra-PEG gel, is prepared by AB-type crosslink-coupling of mutually reactive tetra-arm prepolymers. In this study, we examined the models of elastic modulus and fracture energy using Tetra-PEG gel as a model system. We controlled the structural parameters with tuning the molecular weight and concentration of prepolymers, and reaction conversion of the reaction. This series of controlled network structures, for the first time, enabled us to quantitatively examine these models. We performed the stretching and tearing measurements for these polymer gels. As for the elastic modulus, we observed the shift of the models from the phantom to affine network models around the overlapping concentration of prepolymers. As for the fracture energy, we confirmed the validity of the Lake-Thomas model, which is the most popular model predicting fracture energies of elastomers.

Modeling of energy transfer and parameter effects on it of a vibrator-ground system

2020 ◽  
Vol 23 (15) ◽  
pp. 3251-3262 ◽  
Author(s):  
Gang Li ◽  
Wen Qi ◽  
Zhiqiang Huang ◽  
Zhifei Tao ◽  
Guo Li ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Elastic Modulus ◽  
Total Energy ◽  
Frequency Band ◽  
Structural Parameters ◽  
Reaction Mass ◽  
Soil Parameters ◽  
Frequency Change ◽  
Ground System ◽  
Ground Energy

The amount of energy transferred to the ground truly represents the performance of the seismic vibrator. So, it is crucial to investigate the transfer of energy in the vibrator-ground system and how parameters affect it. For this purpose, a model of vibrator-ground system considering frequency change is developed based on half-space theory, and methods of calculating energy transfer is innovatively proposed. Results show that the total energy done by the hydraulic force on the vibrator-ground system in the frequency band of 3–200 Hz is 3.156×105 J, and 9.11% of the energy is transferred to the ground. In addition, effects of structural parameters and soil parameters on energy transfer are carried out. It is concluded that lightweight reaction mass can significantly increase the total energy, but heavier reaction mass generates more ground energy. Baseplate with small mass not only helps the vibrator to transmit energy uniformly but also generates more ground energy above 100 Hz. Larger baseplate area can improve the baseplate-ground interaction to transfer more energy to the ground. For the effects of soil on energy transfer, the ground energy in low-frequency band is mainly dominated by soil elastic modulus, and both elastic modulus and density of soil have great effects on energy transferred to ground at high frequencies.

Optimal design of a high homogeneous and small-size shim coil for atomic spin gyroscope based on 0-1 linear programming

2020 ◽  
Vol 64 (1-4) ◽  
pp. 165-172
Author(s):  
Dongge Deng ◽  
Mingzhi Zhu ◽  
Qiang Shu ◽  
Baoxu Wang ◽  
Fei Yang
Keyword(s):  
Linear Programming ◽  
Power Consumption ◽  
Low Power ◽  
Optimization Design ◽  
Structural Parameters ◽  
Axial Position ◽  
Low Power Consumption ◽  
Optimal Method ◽  
Atomic Spin ◽  
Shim Coil

It is necessary to develop a high homogeneous, low power consumption, high frequency and small-size shim coil for high precision and low-cost atomic spin gyroscope (ASG). To provide the shim coil, a multi-objective optimization design method is proposed. All structural parameters including the wire diameter are optimized. In addition to the homogeneity, the size of optimized coil, especially the axial position and winding number, is restricted to develop the small-size shim coil with low power consumption. The 0-1 linear programming is adopted in the optimal model to conveniently describe winding distributions. The branch and bound algorithm is used to solve this model. Theoretical optimization results show that the homogeneity of the optimized shim coil is several orders of magnitudes better than the same-size solenoid. A simulation experiment is also conducted. Experimental results show that optimization results are verified, and power consumption of the optimized coil is about half of the solenoid when providing the same uniform magnetic field. This indicates that the proposed optimal method is feasible to develop shim coil for ASG.

Effect Of Elevated Temperatures On Complete Concrete Deformation Diagrams

2019 ◽  
pp. 9-14
Keyword(s):  
Experimental Data ◽  
Elastic Modulus ◽  
Elevated Temperatures ◽  
Peak Load ◽  
Relative Deformation ◽  
Deformation Characteristics ◽  
Compression Tests ◽  
Strain Behavior ◽  
Different Temperatures ◽  
Deformation Diagrams

The analysis of the previous results of the study on concrete stress-strain behavior at elevated temperatures has been carried out. Based on the analysis, the main reasons for strength retrogression and elastic modulus reduction of concrete have been identified. Despite a significant amount of research in this area, there is a large spread in experimental data received, both as a result of compression and tension. In addition, the deformation characteristics of concrete are insufficiently studied: the coefficient of transverse deformation, the limiting relative compression deformation corresponding to the peak load and the almost complete absence of studies of complete deformation diagrams at elevated temperatures. The two testing chambers provided creating the necessary temperature conditions for conducting studies under bending compression and tension have been developed. On the basis of the obtained experimental data of physical and mechanical characteristics of concrete at different temperatures under conditions of axial compression and tensile bending, conclusions about the nature of changes in strength and deformation characteristics have been drawn. Compression tests conducted following the method of concrete deformation complete curves provided obtaining diagrams not only at normal temperature, but also at elevated temperature. Based on the experimental results, dependences of changes in prism strength and elastic modulus as well as an equation for determining the relative deformation and stresses at elevated temperatures at all stages of concrete deterioration have been suggested.

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