A Research on Strength Characteristics of Compact Tension Specimens with Heterogeneous Composite Materials Bonded by Adhesives

2020 ◽  
Vol 17 (7) ◽  
pp. 3218-3223
Author(s):  
Jung-Ho Lee ◽  
Jeong-Ick Lee ◽  
Jae-Ung Cho
Keyword(s):  
Stainless Steel ◽  
Composite Material ◽  
Composite Materials ◽  
Stress Concentration ◽  
Material Property ◽  
Manufacturing Process ◽  
Deformation Energy ◽  
Strength Characteristics ◽  
Good Ductility ◽  
Process Ability

With CT specimen models of CFRP with cracks and adhesive interfaces, this study aims at investigating the strength characteristics of heterogeneous composite materials bonded by adhesives through the analyses. Even minor cracks or defects that may occur inside a composite material in the manufacturing process can result in the stress concentration, and this will lead to the material breakage. So, we designed CT specimen models with CFRP alone and CFRP with stainless steel or aluminum by using their material properties of CFRP, stainless steel, and aluminum. The simulation analyses were carried out and their strength characteristics were investigated. It is necessary to prepare a way to relieve stress concentration at the stage of design under the assumption those cracks actually occur at manufacturing process. By combining CFRP with stainless steel or aluminum, both of which have good ductility, we found that the deformation and deformation energy increased and the maximum equivalent stress decreased. It is thought that this material can lower the risk of material breakage by changing some of the impact energy which may damage CFRP, into the deformation energy. This deformation energy brings about the good ductility by utilizing stainless steel and aluminum under the situations where the sudden tension and impact loads are expected or applied. The results revealed that when CFRP was combined with the heterogeneous metal, it was possible for CFRP to be used where otherwise it could not be used alone and provided CFRP with better material property and more diverse process-ability So, this composite material can be prevented from breakage in the process of manufacturing and increase the safe use. As CFRP with the rigidity better than metals can be applied to composites, the composites with CFRP can be improved to have better material property and more diverse process-ability

Development of Forming Method of Deployable Boom from Thermoplastic Polymer Composite

2021 ◽  
Vol 887 ◽  
pp. 105-109
Author(s):  
A.M. Iuvshin ◽  
Y.S. Andreev ◽  
S.D. Tretyakov
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Polymer Composite ◽  
Manufacturing Process ◽  
Polymer Composite Material ◽  
Polymer Composite Materials ◽  
Thermoplastic Polymer ◽  
Labour Intensity ◽  
Thermoset Polymer ◽  
Length Limitation

This paper studies deployable elements which are used in satellites and different terrestrial antenna devices. Many deployable elements are made from steel or thermoset polymer composite materials and have the following disadvantages like length limitation of deployable elements, labour intensity of manufacturing process of deployable elements etc. For this purpose a deployable tube boom element was chosen and a forming method for manufacturing deployable tube element from thermoplastic polymer composite material was developed.

scholarly journals A study on the sandwich-style notched tensile specimens for different materials through a simulation analysis

2018 ◽  
Vol 7 (3.3) ◽  
pp. 324
Author(s):  
Jung Ho Lee ◽  
Jae Ung Cho
Keyword(s):  
Tensile Strength ◽  
Stainless Steel ◽  
Composite Material ◽  
Statistical Analysis ◽  
Composite Materials ◽  
3D Modeling ◽  
Simulation Analysis ◽  
Maximum Load ◽  
Design Software ◽  
Strength And Durability

Background/Objectives: This study designed a model that used the sandwich-style notched tensile specimens of the same specifications by applying to the properties of CFRP, stainless steel, and aluminum, and performed a test simulation.Methods/Statistical analysis: The study used CATIA design software to perform the 3D modeling of the sandwich-style notched tensile specimens with the properties of CFRP, a composite material, and stainless steel and aluminum, both ordinary metals, and then, performed a tensile test simulation.Findings: By designing the sandwich-style notched tensile specimens of the same specifications and performing a test simulation, we were able to verify the tensile strength and durability of the specimens for the different materials. This study result showed that unlike the specimens for the ordinary metals, those specimens with the properties of the composite material of CFRP first showed maximum load instead of breaking immediately due to the fibers in CFRP, before they resisted displacement in response to the alternately increasing and decreasing load until it fractured. To be specific, we saw that the CFRP specimens had the more excellent tensile strength and durability.Improvements/Applications: The data obtained from the studies will serve as the basic data for studies on the composite materials like CFRP and other various materials.  

Electromagnetic Shielding Effect of Aluminum Foam in 10~500 kV Electrical Substations

2017 ◽  
Vol 898 ◽  
pp. 2378-2383 ◽  
Author(s):  
Qian Qian Yang ◽  
Wen Xiao Qian ◽  
Jing Yuan Liu ◽  
Ming Chen ◽  
Hao Li ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Composite Material ◽  
Composite Materials ◽  
Electric Field ◽  
Aluminum Foam ◽  
Electromagnetic Shielding ◽  
Shielding Effect ◽  
304L Stainless Steel ◽  
Power Frequency ◽  
Frequency Electric Field

With the growing attention drawn to the electrical substation electromagnetic environmental problem, the application of material with electromagnetic shielding effect gains more and more popularity. This work evaluated the electromagnetic shielding effect of aluminum foam in 10 kV Xifaxian transformer dado and three electrical substations, a 66 kV Niluo substation, a 220 kV Hexi substation and a 500 kV Keerqin substation. 304L stainless steel and its composite material were also used as a comparison. By comparing with the environmental data, it showed that the power frequency electric field intensity next to the transformer of 500 kV Keerqin substation was slightly higher than the national standard, whereas the other power frequency electric field and magnetic induction intensities were lower than the limit values. The power frequency electric field and magnetic induction intensities attenuated with the increase of measuring distance from enclosing wall. 304L stainless steel, aluminum foam and their composite materials all had certain electromagnetic shielding effect. Aluminum foam and composite materials had almost the same shielding effect for power frequency electric field, which was slightly better than 304L stainless steel. Unlike the electric shielding effect, the magnetic shielding effect of aluminum foam was significantly superior to that of the 304L stainless steel. Meanwhile, their composite material had the best one.

Multi-Layer Metal Matrix Alloy Surfacing Composite Material Fusion Research on the 45Mn-Austenitic Stainless Steel-(Cr-Ni) System

2013 ◽  
Vol 813 ◽  
pp. 148-152
Author(s):  
Yu Ping Zhao ◽  
Yu Hai Xu
Keyword(s):  
Stainless Steel ◽  
Composite Material ◽  
Composite Materials ◽  
Austenitic Stainless Steel ◽  
Abrasion Resistance ◽  
Metal Alloy ◽  
Fusion Welding ◽  
Resistance Testing ◽  
Carbon Equivalent ◽  
The Matrix

This article in view of the 45Mn-austenitic stainless steel-(Cr-Ni) system composed of metal alloy surfacing multilayer composite materials of the fusion mechanism research, through the hardness testing, impact test and analysis of the abrasion resistance testing, the results show that: Cr-Ni surfacing welding metal alloy system has good abrasion resistance, but the fusion welding the gender is poorer, as long as the matrix in martensite properly morphology of carbon dioxide, its hardness &abrasion resistance may achieve in, high carbon equivalent to achieve performance, show that the alloy elements Mn composite materials plays an important role in improving the wear resistance. Then define the matrix with 45Mn as metal materials, with austenitic stainless steel as sandwich bond, Cr-Ni system alloy metal as surfacing welding surface layer, a new multi-level composite material with excellent comprehensive performance. For multilayer compound material field research provides a theoretical basis.

Stiffness analysis of the sarafix external fixator of composite materials

2016 ◽  
Vol 5 (1) ◽  
pp. 20
Author(s):  
Nedim Pervan ◽  
Elmedin Mesic ◽  
Mirsad Colic ◽  
Vahid Avdic
Keyword(s):  
Stainless Steel ◽  
Composite Material ◽  
Composite Materials ◽  
Structural Analysis ◽  
External Fixator ◽  
Cad Model ◽  
Connecting Rod ◽  
Stiffness Analysis ◽  
Different Types ◽  
Characteristic Points

This paper describes a structural analysis of the CAD model three versions fixators Sarafix which to explore the possibility of introducing composite materials in the construction of the connecting rod fixators comparing values of displacement and stiffness at characteristic points structure. Namely, we investigated constructional performance of fixators Sarafix with a connecting rod formed from three different composite materials, the same matrix (epoxy resin) with three different types of fibers (E glass, kevlar 49 and carbon M55J). Results of structural analysis fixators Sarafix with a connecting rod made of composite materials are compared with the results of tubular connecting rod fixators made of stainless steel. After comparing the results, from the aspect of stiffness, we gave the final considerations about composite material which provides an adequate substitution for the existing material. 

Composite Material Property Database Using Smooth Specimens to Generate Design Allowables With Uncertainty Estimation

2010 ◽  
Author(s):  
Pranav D. Shah ◽  
Jose Daniel D. Melo ◽  
Carlos A. Cimini ◽  
Jeffrey T. Fong
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Material Property ◽  
Composite Structures ◽  
Uncertainty Estimation ◽  
Specimen Preparation ◽  
Test Machine ◽  
Raw Data ◽  
Transverse Tensile ◽  
Uncertainty Estimates

For brevity, the class of “composite materials” in this paper is intended to refer to one of its subclasses, namely, the fiber-reinforced composite materials. In developing composite material property databases, three categories of data are needed. Category 1 consists of all raw test data with detailed information on specimen preparation, test machine description, specimen size and number per test, test loading history including temperature and humidity, etc., test configuration such as strain gage type and location, grip description, etc. Category 2 is the design allowable derived from information contained in Category 1 without making further experimental tests. Category 3 is the same design allowable for applications such that new experiments prescribed by user to obtain more reliable properties for the purpose on hand. At present, most handbook-based composite material property databases contain incomplete information in Category 1 (raw data), where a user is given only the test average values of properties such as longitudinal, transverse, and shear moduli, major and out-of-plane Poisson’s ratios, longitudinal tensile and compressive, transverse tensile and compressive, and shear strengths, inter-laminar shear strength, ply thickness, hygrothermal expansion coefficients, specific gravity, fiber volume fraction, etc. The presentation in Category 1 ignores the inclusion of the entire test environment description necessary for a user to assess the uncertainty of the raw data. Furthermore, the design allowable listed in Category 2 is deterministically obtained from Category 1 and the user is given average design allowable without uncertainty estimation. In this paper, it is presented a case study where average design allowable failure envelopes of open hole specimens were obtained numerically for two different quasi-isotropic carbon fiber-epoxy laminates using the appropriate Category 1 data. Using the method of statistical design of experiments, it is then showed how the average design allowable can be supplemented with uncertainty estimates if the Category 1 database is complete. Application of this methodology to predicting reliability of composite structures is discussed.

Study of the Composite Materials Optimal Structure Containing a Hollow Aluminum and Silica Microsphere Dependence on Humidity

2020 ◽  
Vol 12 ◽  
Author(s):  
Alexandra Atyaksheva ◽  
Yermek Sarsikeyev ◽  
Anastasia Atyaksheva ◽  
Olga Galtseva ◽  
Alexander Rogachev
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Strength Function ◽  
Theory And Practice ◽  
Optimal Structure ◽  
Optimal Size ◽  
Structure And Properties ◽  
Power Functions ◽  
Silica Microsphere ◽  
Heat Engineering

Aims:: The main goals of this research are exploration of energy-efficient building materials when replacing natural materials with industrial waste and development of the theory and practice of obtaining light and ultra-light gravel materials based on mineral binders and waste dump ash and slag mixtures of hydraulic removal. Background.: Experimental data on the conditions of formation of gravel materials containing hollow aluminum and silica microsphere with opportunity of receipt of optimum structure and properties depending on humidity with the using of various binders are presented in this article. This article dwells on the scientific study of opportunity physical-mechanical properties of composite materials optimization are considered. Objective.: Composite material contains hollow aluminum and silica microsphere. Method.: The study is based on the application of the method of separation of power and heat engineering functions. The method is based on the use of the factor structure optimality, which takes into account the primary and secondary stress fields of the structural gravel material. This indicates the possibility of obtaining gravel material with the most uniform distribution of nano - and microparticles in the gravel material and the formation of stable matrices with minimization of stress concentrations. Experiments show that the thickness of the cement shell, which performs power functions, is directly related to the size of the raw granules. At the same time, the thickness of the cement crust, regardless of the type of binder, with increasing moisture content has a higher rate of formation for granules of larger diameter. Results.: The conditions for the formation of gravel composite materials containing a hollow aluminosilicate microsphere are studied. The optimal structure and properties of the gravel composite material were obtained. The dependence of the strength function on humidity and the type of binder has been investigated. The optimal size and shape of binary form of gravel material containing a hollow aluminosilicate microsphere with a minimum thickness of a cement shell and a maximum strength function was obtained. Conclusion.: Received structure allows to separate power and heat engineering functions in material and to minimize the content of the excited environment centers.

Hierarchical ZSM-22/PHTS composite material and its hydro-isomerization performance in hydro-upgrading of gasoline

2021 ◽  
Author(s):  
Jiyuan Fan ◽  
Chengkun Xiao ◽  
Jinlin Mei ◽  
Cong Liu ◽  
Aijun Duan ◽  
...  
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Impregnation Method ◽  
Molar Ratios

CoMo series catalysts based on ZSM-22/PHTS (ZP) composite materials with different SiO2/Al2O3 molar ratios were prepared via the impregnation method. The properties of the ZP material and the corresponding catalysts...

scholarly journals Acoustic Emission and K-S Metric Entropy as Methods for Determining Mechanical Properties of Composite Materials

Sensors ◽  
2020 ◽  
Vol 21 (1) ◽  
pp. 145
Author(s):  
Lesław Kyzioł ◽  
Katarzyna Panasiuk ◽  
Grzegorz Hajdukiewicz ◽  
Krzysztof Dudzik
Keyword(s):  
Mechanical Properties ◽  
Acoustic Emission ◽  
Composite Material ◽  
Composite Materials ◽  
Testing Machine ◽  
Measurement Data ◽  
Entropy Method ◽  
Displacement Sensor ◽  
Metric Entropy ◽  
Plastic Phase

Due to the unique properties of polymer composites, these materials are used in many industries, including shipbuilding (hulls of boats, yachts, motorboats, cutters, ship and cooling doors, pontoons and floats, torpedo tubes and missiles, protective shields, antenna masts, radar shields, and antennas, etc.). Modern measurement methods and tools allow to determine the properties of the composite material, already during its design. The article presents the use of the method of acoustic emission and Kolmogorov-Sinai (K-S) metric entropy to determine the mechanical properties of composites. The tested materials were polyester-glass laminate without additives and with a 10% content of polyester-glass waste. The changes taking place in the composite material during loading were visualized using a piezoelectric sensor used in the acoustic emission method. Thanks to the analysis of the RMS parameter (root mean square of the acoustic emission signal), it is possible to determine the range of stresses at which significant changes occur in the material in terms of its use as a construction material. In the K-S entropy method, an important measuring tool is the extensometer, namely the displacement sensor built into it. The results obtained during the static tensile test with the use of an extensometer allow them to be used to calculate the K-S metric entropy. Many materials, including composite materials, do not have a yield point. In principle, there are no methods for determining the transition of a material from elastic to plastic phase. The authors showed that, with the use of a modern testing machine and very high-quality instrumentation to record measurement data using the Kolmogorov-Sinai (K-S) metric entropy method and the acoustic emission (AE) method, it is possible to determine the material transition from elastic to plastic phase. Determining the yield strength of composite materials is extremely important information when designing a structure.

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