Research on the Impact Mechanic Property of the Silicon Carbide with Tungsten (SiC-W) Composite Material

2014 ◽  
Vol 675-677 ◽  
pp. 52-57
Author(s):  
Hong Chan Sun ◽  
Bing Hu ◽  
Huan Zhang ◽  
Li Na Zhang ◽  
Xin Ge Wang
Keyword(s):  
Silicon Carbide ◽  
Composite Material ◽  
Brittle Material ◽  
Lamellar Structure ◽  
Performance Test ◽  
Micro Structure ◽  
Mechanics Performance ◽  
The Impact ◽  
Mechanic Property

This article does some research on SiC-W composite material. Getting the material with SPS, the micro-structure was observed. The micro-structure of SiC is mainly lamellar structure and the Tungsten did not infiltrate the SiC. Via mechanics performance test of SiC-W, we found although both SiC and SiC-W show the characters of brittle material, but the Tungsten mixing can improve the toughness in certain level.

Rupture by impact-induced fatigue of a copper foil strip embedded in a multifunctional composite material

2021 ◽  
pp. 002199832199432
Author(s):  
Yacine Ouroua ◽  
Said Abdi ◽  
Imene Bachirbey
Keyword(s):  
Composite Material ◽  
Mechanical Characteristics ◽  
Glass Fibers ◽  
Energy Levels ◽  
Fatigue Tests ◽  
Repeated Impact ◽  
Aeronautical Industry ◽  
Repeated Impacts ◽  
Cracking Mode ◽  
The Impact

Multifunctional composite materials are highly sought-after by the aerospace and aeronautical industry but their performance depends on their ability to sustain various forms of damages, in particular damages due to repeated impacts. In this work we studied the mechanical behavior of a layered glass-epoxy composite with copper inserts subjected to fatigue under repeated impacts with different energy levels. Damage evolution as a function of impact energy was carefully monitored in order to determine the effect of the copper inserts on mechanical characteristics of the multifunctional composite, such as endurance and life. Results of repeated impact tests show that electric current interruption in the copper inserts occurs prior to the total perforation of the composite material, and after about 75% of the total number of impacts to failure. This is the case for the three energy levels considered in this study, [Formula: see text] = 2, 3 and 4 Joules. The epoxy resin was dissolved chemically in order to preserve the mechanical structure of the damaged copper inserts and the composite fibers for further inspection and analysis. Scanning electron microscopy (SEM) of the fractured copper inserts revealed interesting information on the nature of the damage, including information on plastic deformation, strain hardening, cracking mode, temperature increase during the impacts, and most importantly the glass fibers and their roles during the impact-fatigue tests.

Impact action on fiber and composite material based on it

2020 ◽  
Vol 6 ◽  
pp. 69-74
Author(s):  
V.V. Kudinov ◽  
◽  
I.K. Krylov ◽  
N.V. Korneeva ◽  
◽  
...  
Keyword(s):  
Composite Material ◽  
Deformation Behavior ◽  
Failure Mechanisms ◽  
Basic Mechanism ◽  
Impact Action ◽  
Uhmwpe Fiber ◽  
Mechanism Of Failure ◽  
First Moment ◽  
The Impact ◽  
Ib Method

The low-velosity impact properties and failure mechanisms of ultra-high molecular weight polyethylene (UHMWPE) fiber (Dyneema®SK-75) and a composite material (CM) based on it with the rigid and flexible matrices were investigated by the “Impact Break” (IB) method. A fundamental difference in deformation behavior and failure mechanisms upon impact on the UHMWPE-fiber and on the CM based on this fiber has been investigated experimentally. It is shown that impact has a little effect on the properties of UHMWPE-fiber, since it is an isotropic material. It has been established that upon impact, the properties of a fiber without a matrix were significantly higher than the properties of CM based on it. Impact action stimulates the interaction between CM components (fibers and matrix). Mechanism of stepwise deformation of anisotropic CM is occurred, which begins from the first moment of impact and ends with the destruction of the CM. A “stairway of deformation” behavior is observed in anisotropic materials. Stepwise deformation is the main form of deformation and the basic mechanism of failure of anisotropic composite materials upon impact.

Analysis of Forward Surge Performance of SiC Schottky Diodes

2018 ◽  
Vol 924 ◽  
pp. 621-624 ◽  
Author(s):  
Rahul Radhakrishnan ◽  
Nathanael Cueva ◽  
Tony Witt ◽  
Richard L. Woodin
Keyword(s):  
Silicon Carbide ◽  
Failure Analysis ◽  
Ohmic Contact ◽  
Schottky Diodes ◽  
Forward Bias ◽  
Device Failure ◽  
Electrical Failure ◽  
The Impact ◽  
Surge Current

Silicon Carbide JBS diodes are capable, in forward bias, of carrying surge current of magnitude significantly higher than their rated current, for short periods. In this work, we examine the mechanisms of device failure due to excess surge current by analyzing variation of failure current with device current and voltage ratings, as well as duration of current surge. Physical failure analysis is carried out to correlate to electrical failure signature. We also quantify the impact, on surge current capability, of the resistance of the anode ohmic contact to the p-shielding region.

Experimental Study on the Performance of the Basalt Fiber Concrete Resistance to Freezing and Thawing

2014 ◽  
Vol 584-586 ◽  
pp. 1304-1308 ◽  
Author(s):  
Sheng Ji Jin ◽  
Zhong Liang Li ◽  
Jian Zhang ◽  
Yan Ling Wang
Keyword(s):  
Composite Material ◽  
Modulus Of Elasticity ◽  
Dynamic Modulus ◽  
Performance Test ◽  
Basalt Fiber ◽  
Fiber Reinforced Concrete ◽  
Quality Loss ◽  
Freezing And Thawing ◽  
Dynamic Modulus Of Elasticity ◽  
Fiber Concrete

The concrete composite material with basalt fiber as enhancing system in it has a lot of advantages ,including excellent mechanical properties , high temperature resistant, resistant to acid and alkali, low cost, environmental protection materials and resistance production process. It has been applied to the field of construction project. Damage of northern environment of freezing and thawing on the properties of the composite material has become a new hot issue. In order to study the characteristics of basalt fiber reinforced concrete as building composite materials in the process of freezing and thawing, this research uses the freeze-thaw cycle test to carry out the performance study on change of dynamic modulus of elasticity and quality loss of basalt fiber concrete. We use basalt fiber volume content of 0, 0.1%, 0.2% and 0.3% respectively of four groups of concrete specimens as the research object, to carry them on the freezing-thawing resisting performance test research. Research results show that the performance of dynamic modulus of elasticity and quality loss of basalt fiber concrete in freezing and thawing process is obviously better than the plain concrete. The dosage of 0.3% basalt fiber concrete freezing-thawing resisting performance is the best in the four groups of concrete samples.

scholarly journals Organizational governance of inter-firm resource combinations: The impact of structural embeddedness and vertical resource relatedness

2016 ◽  
Vol 23 (4) ◽  
pp. 524-544 ◽  
Author(s):  
Sungho Kim ◽  
Kyuho Jin
Keyword(s):  
Mergers And Acquisitions ◽  
Vertical Dimension ◽  
Firm Boundaries ◽  
Micro Structure ◽  
Organizational Governance ◽  
Structural Embeddedness ◽  
Focal Firm ◽  
The Impact ◽  
Flow Of Information ◽  
Governance Choice

AbstractFirms not only combine resources within firm boundaries but tap into, acquire, or consolidate resources outside firm boundaries. Alliances and mergers and acquisitions (M&A) are distinct vehicles for governing inter-firm resource combinations. Prior studies on the governance choice between them have relied on firm- or dyad-level attributes to explicate the choice firms make about the governance. However, any firm or dyad is a micro-structure embedded in networks that shape the flow of information and resources to the focal firm or dyad. In addition, although alliances and mergers and acquisitions involve either horizontal or vertical resource combinations, the vertical dimension of resource relatedness has been largely neglected in prior research. This study examines the impact of structural embeddedness and vertical resource relatedness on governance choice. We find that structural embeddedness is an important driver of governance choice and that a significant portion of resource combinations occurs along the vertical dimension of relatedness.

ASPECTS OF STRUCTURE FORMATION DISPERSION-STRENGTHENED METAL COMPOSITE MATERIAL OBTAINED ON THE BASIS OF SHAVINGS AND POWDER OF ALUMINUM CORROSION-RESISTANT ALLOY

2021 ◽  
pp. 39-46
Author(s):  
A.V. Gololobov ◽  
◽  
A.N. Nyafkin ◽  
A.N. Zhabin ◽  
◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Composite Material ◽  
Mechanical Alloying ◽  
Structure Formation ◽  
Metal Composite ◽  
Corrosion Resistant ◽  
Resistant Alloy ◽  
Aluminum Corrosion ◽  
Corrosion Resistant Alloy

A metal composite material (MCM) based on an aluminum corrosion-resistant alloy of the AMg6 brand, containing 22.5 % (vol.) Silicon carbide, obtained by mechanical alloying, has been investigated. Aspects of the formation of the MCM structure based on chips and powder from this alloy are considered. The influence of the initial components on the structure of the dispersion-strengthened MCM was investigated, and samples were made from this composite material.

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