Revealing Mechanical Strength of Nanopores Using Atomic Finite Element Techniques

2018 ◽  
Vol 934 ◽  
pp. 24-29
Author(s):  
Prapasiri Pongprayoon ◽  
Attaphon Chaimanatsakun
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Fluid Flow ◽  
Mechanical Strength ◽  
Impact Force ◽  
Pore Surface ◽  
Vertical Rectangle ◽  
The Impact ◽  
Graphene Nanopore

Graphene nanopore has been widely employed in nanofilter or nanopore devices due to its outstanding properties. The understanding of its mechanical properties at nanoscale is crucial for device improvement. In this work, the mechanical properties of graphene nanopore is thus investigated using atomistic finite element method (AFEM). Four graphene models with different pore shapes (circular (CR), horizontal rectangle (RH), and vertical rectangle (RV)) in sub-nm size which could be successfully fabricated experimentally have been studied here. The force normal to a pore surface is applied to mimic the impact force due to a fluid flow. Increasing pore size results in the reduction in its strength. Comparing among different pore shapes with comparable sizes, the order of pore strength is CR>RH>RV>SQ. In addition, we observe that the direction of pore alignment and geometries of pore edge also play a key role in mechanical strength of nanopores.

Simulation of the Impact Behaviour of Diffusion-Bonded and Adhered Perforated Hollow Sphere Structures (PHSS)

2009 ◽  
Vol 294 ◽  
pp. 27-38 ◽  
Author(s):  
Fabian Ferrano ◽  
Marco Speich ◽  
Wolfgang Rimkus ◽  
Markus Merkel ◽  
Andreas Öchsner
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behaviour ◽  
Hollow Sphere ◽  
Large Deformations ◽  
The Finite Element Method ◽  
Impact Behaviour ◽  
New Type ◽  
The Impact

This paper investigates the mechanical properties of a new type of hollow sphere structure. For this new type, the sphere shell is perforated by several holes in order to open up the inner sphere volume and surface. The mechanical behaviour of perforated sphere structures under large deformations and strains in a primitive cubic arrangement is numerically evaluated by using the finite element method for different hole diameters and different joining techniques.

Spectral-Domain Based Impact Force Identification for Rod Structures

2013 ◽  
Author(s):  
Pooya Ghaderi ◽  
Steven I. Rich ◽  
Andrew J. Dick
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Impact Force ◽  
Force Identification ◽  
Identification Method ◽  
Spectral Finite Element Method ◽  
Spectral Finite Element ◽  
Rod Structures ◽  
The Impact ◽  
Element Method

Indirect impact force identification has attracted researchers due to the simplicity of indirect methods for calculating the applied force during the impact incident. In this paper, an impact force identification method for rod structures is proposed. The proposed method uses the spectral finite element method. The spectral finite element method is a frequency-based finite element method that takes advantage of the benefits of spectral methods and the simplicity of the finite element method. Using the frequency domain method for impact force identification simplifies the calculations and allows for the identification of impact forces with high frequency content, including MHz and above. The impact force identification method uses the collected data of the response of a section of the structure and utilizes the spectral finite element model of the structure to calculate the impact force. The results of the numerical study display strong agreement between the simulated impact force and the identified force. The performance of the force identification method is verified by applying it to experimental data collected from an impacted rod structure.

scholarly journals Impact of falling cables on bulkhead beams / Impacto da queda de cabos nas vigas das anteparas

2021 ◽  
Vol 7 (10) ◽  
pp. 95029-95037
Author(s):  
Victor Casulli De Oliveira ◽  
Marcelo Araujo Da Silva ◽  
Reyolando Manoel Lopes Rebello Da Fonseca Brasil
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Energy Conservation ◽  
Cross Section ◽  
Impact Force ◽  
Steel Beam ◽  
The Impact ◽  
Impact Of Falling ◽  
The Ideal ◽  
Element Method

In this work, 585.95 meters long falling cable will be considered to compute its impact on a steel beam. The beam is lifted by two cranes and used as a shield to protect structures under the cables, during its installation. Using energy conservation concepts, it is possible to find the impact force on the beam, and, with that, to design the ideal steel cross section to support such impact. A model was also developed using the STRAP software, via Finite Element Method, to perform a more refined analysis and check the design of the metal beam.

scholarly journals Elastic Responses of a Composite Shell Structure Subjected to Impact Loading

2021 ◽  
Author(s):  
Shiuh-Chuan HER ◽  
Ching-Chun LIAO
Keyword(s):  
Differential Equation ◽  
Finite Element Method ◽  
Finite Element ◽  
Composite Laminate ◽  
Composite Shell ◽  
Impact Force ◽  
Laminate Shell ◽  
The Finite Element Method ◽  
Elastic Responses ◽  
The Impact

Received 17 December 2019; accepted 17 June 2020 This work investigated the elastic responses of a composite laminate shell subjected to a transverse low-velocity impact. The governing equation based on the equations of motion of both the impactor and target was developed to detetrmine the impact force. The displacement of the shell subjected to unit impulse loading was solved using the finite element method. A non-linear differential equation in terms of the indentation depth was derived by incorporating the Hertzian contact law and theory of convolution. Runge-Kutta method was employed to solve the non-linear integro-differential equation, leading to the determination of the impact force at the point of contact between the impactor and the composite shell. The elastic responses including the displacement and stress of the composite laminate shell were evaluated using the finite element method by exerting the impact force on the apex of the composite shell. Present approach was verified with the analytical, experimental and numerical results reported in the existing literatures. The influences of stacking sequence of the composite laminate shell on the impact responses were examined through a series of parametric studies. In addition, impact responses of the spherical shells with different materials such as steel, aluminum and glass were studied.

Analysis on the Drop of PCB Packaged by Cushion Material Based on Finite Element Method

2013 ◽  
Vol 288 ◽  
pp. 303-307
Author(s):  
Gai Mei Zhang ◽  
Heng Yi Guo ◽  
Yue Lou ◽  
Qi Lu Tao ◽  
Wei Yuan ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Elastic Modulus ◽  
Printed Circuit Board ◽  
Impact Force ◽  
Circuit Board ◽  
Drop Height ◽  
Printed Circuit ◽  
Finite Element Software ◽  
The Impact

This paper analyzes the stress of the printed circuit board (PCB) packaged by cushion materials after drop and investigates the stress of PCB under the different drop height, different cushion materials and different drop ground using ANSYS finite element software. The stress of PCB is analyzed quantitatively and qualitatively after drop, the results show: (1) The stress of the product is effected by drop height and the performance of dropping ground in a large extent; (2) The protect performance varies with the ways of cushioning packaging; (3) Within a certain range, the cushion material with smaller elastic modulus is better due to absorb the impact more energy and can bear the impact force is greater.

A Fracture Mechanics Based Parametric Study of the Copper-to-Copper Direct Thermo-Compression Bonded Interface Using Finite Element Method

2013 ◽  
Author(s):  
Ah-Young Park ◽  
Satish Chaparala ◽  
Seungbae Park
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Parametric Study ◽  
Initial Crack ◽  
Bonding Interface ◽  
Interface Condition ◽  
Large Temperature ◽  
Bonded Interface ◽  
The Impact ◽  
Element Method

Through-silicon via (TSV) technology is expected to overcome the limitations of I/O density and helps in enhancing system performance of conventional flip chip packages. One of the challenges for producing reliable TSV packages is the stacking and joining of thin wafers or dies. In the case of the conventional solder interconnections, many reliability issues arise at the interface between solder and copper bump. As an alternative solution, Cu-Cu direct thermo-compression bonding (CuDB) is a possible option to enable three-dimension (3D) package integration. CuDB has several advantages over the solder based micro bump joining, such as reduction in soldering process steps, enabling higher interconnect density, enhanced thermal conductivity and decreased concerns about intermetallic compounds (IMC) formation. Critical issue of CuDB is bonding interface condition. After the bonding process, Cu-Cu direct bonding interface is obtained. However, several researchers have reported small voids at the bonded interface. These defects can act as an initial crack which may lead to eventual fracture of the interface. The fracture could happen due to the thermal expansion coefficient (CTE) mismatch between the substrate and the chip during the postbonding process, board level reflow or thermal cycling with large temperature changes. In this study, a quantitative assessment of the energy release rate has been made at the CuDB interface during temperature change finite element method (FEM). A parametric study is conducted to analyze the impact of the initial crack location and the material properties of surrounding materials. Finally, design recommendations are provided to minimize the probability of interfacial delamination in CuDB.

The Study on Crashworthiness Performance of Thin-Walled Structures and the Effect of Welding Performance on it

2011 ◽  
Vol 63-64 ◽  
pp. 655-658
Author(s):  
Qi Hao ◽  
Sheng Jun Wu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Welded Joints ◽  
Impact Force ◽  
Deformation Energy ◽  
Optimal Shape ◽  
Explicit Finite Element Method ◽  
Explicit Finite Element ◽  
Thin Walled Structures ◽  
Thin Walled

Explicit finite element method is adopted to simulate the crashworthiness performance of four types of typical thin—walled structures used in vehicle by software LS-DYNA. The structures with the same material、area and length are crash by a rigid body with 40km/h in10ms, The crash processes and crashworthiness characters are analyzed by a series crash parameters: deformation energy with unit displacement, impact force and deceleration to look for the optimal shape with crashworthiness. With comparing, the double caps section has ascendant performance than the others. The simulating methods of welded-joints are discussed to analysis their effects on crashworthiness simulation.

Collapse of Tubes Under Combined Bending and Axial Compression Loads

2018 ◽  
Author(s):  
Shan Jin ◽  
Shuai Yuan ◽  
Yong Bai
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Axial Compression ◽  
Local Buckling ◽  
Practical Application ◽  
Buckling Modes ◽  
Combined Loads ◽  
Bending Loads ◽  
Good Agreement

In practical application, pipelines will inevitably experience bending and compression during manufacture, transportation and offshore installation. The mechanical behavior of tubes under combined axial compression and bending loads is investigated using experiments and finite element method in this paper. Tubes with D/t ratios in the range of 40 and 97 are adopted in the experiments. Then, the ultimate loads and the local buckling modes of tubes are studied. The commercial software ABAQUS is used to build FE models to simulate the load-shortening responses of tubes under combined loads. The results acquired from the ABAQUS simulation are compared with the ones from verification bending experiment, which are in good agreement with each other. The models in this paper are feasible to analyze the mechanical properties of tubes under combined axial compression and bending loads. The related results may be of interest to the manufacture engineers.

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