Bending Calculus for Bio-Composite Sandwich Beams with Two Equal Consoles

2016 ◽  
Vol 859 ◽  
pp. 46-51
Author(s):  
Mihai Sorin Tripa ◽  
Sorcoi Dorina ◽  
Lucia Ghioltean ◽  
Adriana Sorcoi ◽  
Mihaela Suciu
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Composite Materials ◽  
Sandwich Beam ◽  
Thermal Characteristics ◽  
Composite Beams ◽  
Sandwich Beams ◽  
Polystyrene Foam ◽  
Foam Polystyrene ◽  
Composite Sandwich

Aeronautic industries, medicine, automotive industries are domains in which the composite materials are very important. In orthopedics and orthodontist domains, titanium and its alloys are very used, because their mechanical properties are similar to bone tissue. Bio-composite sandwich beams have high stiffness in flexion and good thermal characteristics. The analytical calculus for bending bio-composite beams is very important. We calculate the arrows for sandwich beams for two aspects: first – beam in four kinds of alloys (titanium alloys, stainless steel, aluminum alloys, Co-Cr-Mo alloys) and second – bio-composite sandwich beam, composed of two equal layers in same alloys and heart in: polyurethane foam, polystyrene foam, epoxide, phenolic, polyester, polyamides, balsa 1 and balsa 2 and compare its.

scholarly journals The Vibration Response of Composite Sandwich Beam with Delamination

2007 ◽  
Vol 16 (2) ◽  
pp. 096369350701600 ◽  
Author(s):  
Buket Okutan Baba ◽  
Ronald F. Gibson
Keyword(s):  
Finite Element ◽  
Natural Frequencies ◽  
Sandwich Beam ◽  
Laminated Composite ◽  
Sandwich Beams ◽  
Element Analysis ◽  
Composite Sandwich ◽  
Dimensional Finite Element ◽  
Vibration Tests ◽  
Non Destructive

The aim of this study is to report the effect of delamination on the vibration characteristics of composite sandwich beams. The natural frequencies and corresponding vibration modes of a free-free sandwich beam with delamination of various sizes and locations are predicted using a two-dimensional finite element analysis (FEA). The presence of delamination affects the stiffness of the delaminated beam and results in differences on the natural frequencies of the beam. Assessment of the differences light the way for the existence, size and location of the delaminated region and can be used for a non-destructive evaluation of the damage characteristics of the delaminated beams. Vibration tests are conducted on fully bonded sandwich beams with carbon/epoxy laminated composite faces and foam core to verify the finite element results. Agreement between predictions of the model and experimental observations is good.

Improve the thermal and mechanical properties of foam polystyrene by gebrile soil

2020 ◽  
Vol 27 (4) ◽  
pp. 8-12
Author(s):  
montajb Al-khodary ◽  
sabah AL-sibai ◽  
moaffaq Tellawi
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Thermal Insulation ◽  
Permissible Limit ◽  
Strength Increase ◽  
Thermal And Mechanical Properties ◽  
Polystyrene Foam ◽  
Natural Materials ◽  
Foam Polystyrene ◽  
Insulation Materials

n this research we tried to improve the thermal insulation efficiency of polystyrene foam by adding some natural materials. The gebrile soil was selected for several reasons, including abundance and ease of processing before the addition - There are many previous researches for soil treatment -. We have found at ratio 20%(The proportion of the soil in the compound) the coefficient of conduction is low and then rises after this percentage As for the absorption of water it increases by increasing the soil, but at this ratio the absorption is within the permissible limit according to the specifications required for the insulation materials and also compressive strength increase with the increasing of the soil ratio because of increasing of mechanical links between the polycarbonate and polystyrene particles and composite-material’s density increasing in general.

About Buckling Bio-Composite Sandwich Bars

2012 ◽  
Vol 245 ◽  
pp. 39-44 ◽  
Author(s):  
Mihaela Suciu
Keyword(s):  
Mechanical Properties ◽  
Bone Tissue ◽  
Sandwich Structures ◽  
Thermal Characteristics ◽  
Critical Value ◽  
Applied Force ◽  
Life Domains ◽  
Composite Sandwich ◽  
Composites Materials ◽  
Critical Buckling Force

Abstract. The bio-composites materials are very important for a lot of industry and life domains, particularly in the aeronautic industries and medicine, in orthopedics. Titanium and its alloys are most widely used, due to their mechanical properties similar to bone tissue. The sandwich structures are very light, they have a high stiffness in flexion and very good thermal characteristics. For the compressed sandwich structures, risks of buckling are higher than the conventional compressed structures, limited by a critical value of the applied force, then the deformations grow in importance and uncontrolled manner. We try to calculate the critical buckling force by the method presented in [2].

The response of pin-clamped carbon fibre-reinforced plastics composite sandwich beams with polyvinylchloride foam core under bending impact

2020 ◽  
Vol 39 (9-10) ◽  
pp. 384-405
Author(s):  
Umut Caliskan ◽  
M Kemal Apalak
Keyword(s):  
Failure Mechanism ◽  
Sandwich Beam ◽  
Sheet Thickness ◽  
Adhesive Layer ◽  
Failure Criteria ◽  
Face Sheet ◽  
Foam Core ◽  
Sandwich Beams ◽  
Composite Sandwich ◽  
Fibre Angle

The dynamic response of pin-clamped composite sandwich beam in terms of face-sheet effect with polyvinylchloride foam core subjected to bending impact loading was investigated in this paper. Composite sandwich beams with three different unidirectional skin layups of [0]4, [45]4 and [90]4 and two types of face-sheet thickness of 1 ([0]4) and 2 ([0]8) mm were fabricated. An explicit code, VUMAT, is written and implemented in ABAQUS/Explicit. The micro-computerised tomography scanning was used to detect adhesive layer failure. The ply angle orientation of face sheets plays an important role in the failure mechanism of the sandwich beam under bending loads. Although it is known that the fibre angle in the direction perpendicular to the bending direction is more stiff and strength, damage tolerances under bending impact loads of beams with other fibre angles were determined. In addition, as the number of layers increased, failure mechanism and load-carrying capacity of composite face sheets changed completely for increasing bending stiffness. This research provides fundamental information about the change of the failure mechanisms as the fibre angle and thickness of the face sheet were changed and in terms of interpretation with the help of finite elements using different failure criteria.

Experimental-Theoretical Research of Mechanical Properties of Perforated Composite Sandwich Panels

2015 ◽  
Vol 243 ◽  
pp. 1-10 ◽  
Author(s):  
A.N. Anoshkin ◽  
V.Yu. Zuiko ◽  
A.V. Tchugaynova ◽  
E.N. Shustova
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Theoretical Analysis ◽  
Tensile Testing ◽  
Sandwich Panels ◽  
Theoretical Research ◽  
Composite Sandwich Panels ◽  
Composite Sandwich ◽  
Fibrous Polymer ◽  
Fibrous Polymer Composite

This work is devoted to experimental-theoretical analysis of mechanical properties of sandwich panels made of fibrous polymer composite materials. The structures with tubular core were considered. Numerical simulations of the mechanical behaviour and tensile testing of full-scale samples of sandwich panels were done. The analysis of influence of perforation on mechanical properties of fiberglass laminates and sandwich panels was alsoperformed.

scholarly journals Research Progress of Cryogenic Materials for Storage and Transportation of Liquid Hydrogen

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1101
Author(s):  
Yinan Qiu ◽  
Huan Yang ◽  
Lige Tong ◽  
Li Wang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Aluminum Alloy ◽  
Composite Materials ◽  
Low Temperature ◽  
Hydrogen Storage ◽  
Large Scale ◽  
Liquid Hydrogen ◽  
Research Progress ◽  
Temperature Performance

Liquid hydrogen is the main fuel of large-scale low-temperature heavy-duty rockets, and has become the key direction of energy development in China in recent years. As an important application carrier in the large-scale storage and transportation of liquid hydrogen, liquid hydrogen cryogenic storage and transportation containers are the key equipment related to the national defense security of China’s aerospace and energy fields. Due to the low temperature of liquid hydrogen (20 K), special requirements have been put forward for the selection of materials for storage and transportation containers including the adaptability of materials in a liquid hydrogen environment, hydrogen embrittlement characteristics, mechanical properties, and thermophysical properties of liquid hydrogen temperature, which can all affect the safe and reliable design of storage and transportation containers. Therefore, it is of great practical significance to systematically master the types and properties of cryogenic materials for the development of liquid hydrogen storage and transportation containers. With the wide application of liquid hydrogen in different occasions, the requirements for storage and transportation container materials are not the same. In this paper, the types and applications of cryogenic materials commonly used in liquid hydrogen storage and transportation containers are reviewed. The effects of low-temperature on the mechanical properties of different materials are introduced. The research progress of cryogenic materials and low-temperature performance data of materials is introduced. The shortcomings in the research and application of cryogenic materials for liquid hydrogen storage and transportation containers are summarized to provide guidance for the future development of container materials. Among them, stainless steel is the most widely used cryogenic material for liquid hydrogen storage and transportation vessel, but different grades of stainless steel also have different applications, which usually need to be comprehensively considered in combination with its low temperature performance, corrosion resistance, welding performance, and other aspects. However, with the increasing demand for space liquid hydrogen storage and transportation, the research on high specific strength cryogenic materials such as aluminum alloy, titanium alloy, or composite materials is also developing. Aluminum alloy liquid hydrogen storage and transportation containers are widely used in the space field, while composite materials have significant advantages in being lightweight. Hydrogen permeation is the key bottleneck of composite storage and transportation containers. At present, there are still many technical problems that have not been solved.

Semi-active vibration control of SiC-reinforced Al6082 metal matrix composite sandwich beam with magnetorheological fluid core

2019 ◽  
Vol 234 (3) ◽  
pp. 408-424 ◽  
Author(s):  
J Vipin Allien ◽  
Hemantha Kumar ◽  
Vijay Desai
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Damping Ratio ◽  
Sandwich Beam ◽  
Magnetorheological Fluid ◽  
Sandwich Beams ◽  
Composite Sandwich ◽  
Fluid Core ◽  
Silicon Carbide Particles

Dynamic characterization of silicon carbide particles reinforced Al6082 alloy metal matrix composite sandwich beam with magnetorheological fluid core is experimentally investigated. The study is focused on determining the effect of magnetorheological fluid core on the dynamic behavior of the sandwich structure. The magnetorheological fluid core is enclosed between the top and bottom metal matrix composite beams. The metal matrix composite beams are cast with silicon carbide particles in Al6082 alloy varying from 0 to 20 wt%. The magnetorheological fluid is prepared in-house and contains 30 vol.% carbonyl iron powder and 70 vol.% silicone oil. The free vibration test is conducted to determine the natural frequencies and damping ratio. It is found that the natural frequencies and damping ratio of the sandwich beams increased with an increase in the applied magnetic flux density. The experimental forced dynamic response of sandwich beams is carried out using sine sweep excitation. Vibration amplitude suppression capabilities of the sandwich beams subjected to varying magnetic flux densities are determined. The experimental forced vibration results reveal that metal matrix composite–magnetorheological fluid core sandwich beams have excellent vibration amplitude suppression capabilities.

Finite Element Analysis of Centrally-Debonded Composite Sandwich Beam under Four Point Bending

2011 ◽  
Vol 335-336 ◽  
pp. 351-354 ◽  
Author(s):  
Meng Kao Yeh ◽  
Yu Wen Chiu
Keyword(s):  
Finite Element ◽  
Composite Structures ◽  
Sandwich Structure ◽  
Sandwich Beam ◽  
Core Material ◽  
Sandwich Beams ◽  
Element Analysis ◽  
Specific Strength ◽  
Composite Sandwich ◽  
Four Point Bending

Sandwich structure, with high specific strength, high specific stiffness facesheet and light-weighted core material bonded together, is one of commonly used composite structures. During the manufacturing process, it is possible to have debonding between facesheet and core. This facesheet/core debonding affects the mechanical property and strength of sandwich structure. In this study, sandwich beams are made of graphite/epoxy laminate as facesheet and MWNTs/epoxy nanocomposites as core material. The composite sandwich beam, with a central facesheet/core debond and under four point bending, was analyzed by the finite element method. The length of the debonding layer, the fiber orientation of the facesheet laminate and MWNTs content in core were varied to assess their effects on the bending behavior and the strengths of the centrally-debonded sandwich beams.

Effects of Microstructural Evolution and Mechanical Properties on 440C-TiC Composite Steel by HIP Treatment

2010 ◽  
Vol 129-131 ◽  
pp. 1114-1118
Author(s):  
Shih Hsien Chang ◽  
Tzu Piao Tang ◽  
Kuo Tsung Huang ◽  
Jhewn Kuang Chen ◽  
Cheng Liang
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
High Pressure ◽  
Stainless Steel ◽  
Composite Materials ◽  
Steel Matrix ◽  
High Chromium ◽  
Small Needle ◽  
Chromium Stainless Steel ◽  
Composite Steel

The aim of this paper is to investigate the effects of HIP treatment on 440C-TiC composite steel. In this study, AISI 440C stainless steel powders were added with different amounts of TiC powders (25, 33 and 40 wt%), the composite materials were sintered at 1473 K, 1573 K, and 1673 K, followed by different pressures of HIP and HIP plus heat treatment. HIP treatments were used 120 and 150 MPa at 1523 K 1 hour. Experimental results showed that the microstructure of matrix had small needle structures after HIP treatment, which were effective in improving the hardness and strength. Furthermore 440C-TiC composite steels which were added with 25wt% TiC powder after 1673 K sintered and high pressure HIP treatments, TiC powders were uniformly dispersed in the high chromium stainless steel matrix were observed and consequently possessed the higher hardness (HRA 85) and highest TRS (1213 MPa).

Bending Response of Composite Sandwich Beams with M-Type Folded Cores

2014 ◽  
Vol 1049-1050 ◽  
pp. 452-455
Author(s):  
Li Xin Cong ◽  
Yu Guo Sun
Keyword(s):  
Failure Modes ◽  
Fiber Composite ◽  
Sandwich Beam ◽  
Deformation Mode ◽  
Sandwich Beams ◽  
The Finite Element Method ◽  
Carbon Fiber Composite ◽  
Maximum Displacement ◽  
Three Point Bending ◽  
Composite Sandwich

Bending properties and failure modes of sandwich structure with carbon fiber composite M-type folded cores were investigated and presented in this paper. Three point bending responses of both sandwich beams were measured. The finite element method was utilized to determine deformation mode of sandwich beam with M-type folded cores. Cores buckling and debonding have been studied under three point bending and the maximum displacement was also studied using FE-analytical and experimental methods.

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