Transparent materials

Corrosion Cracking Stress Corrosion Cracking (SCC) is the growth of cracks with a under the combined effects of a static stress and a specific chemical environment. All SCC failures involve a macroscopic brittle performance, and the ductility of the material is reduced. It is universally acknowledged that there is no single mechanism for stress corrosion cracking (Ford, 1984). Stress corrosion spectrum (Parkins, 1972) demonstrates the significant alloy-environment the mechanism…

quickly. Alumina is a chemically inert ceramic compound and sliding interaction of diamond coatings against alumina material is purely mechanical. Low and stable friction coefficient values of around 0.0804 were observed with the boron doped NCD coating. The stable and low friction coefficient of the boron doped NCD coating was attributed to the chemical inertness of the mating materials and also due to the…

Did you know that some states have passed laws making it illegal to throw batteries away in the garbage? Many people are unaware of this fact. In 1991, the state of North Carolina rendered it illegal to discard of lead-acid batteries in a landfill, incinerator or any other type of waste-to-energy facility. The purpose of this report is to provide you with information on rechargeable batteries so you will have a better understanding on the benefits of a recycling program and possible…

Introduction: Selecting a pair of hunting boots is totally on the hunter and his needs. For serious hunters, who climb deep mountains, spend hours in the jungle and travel to colder regions in search of animals, choosing the right hunting boot is always essential. You will not only need the best quality hunting boot, but you will also need a pair of comfortable and lightweight boots too. Unlike any other shoe or boot you choose for yourself, these boots should be wisely selected. If you have…

ASTM STANDARDS Short introduction – ASTM standards are consensus standards for systems, services, materials and products. ‘ASTM International’ is one of the largest voluntary standard developing organization in the world. It is a non-profit organization that provides a forum for the development and publication of international voluntary standards. There are approximately 12,575 ASTM standards that operate globally. TESTING ASTM STANDARDS- Scope- There test methods help in the determining of…

with a wedge. The one in the lab was an MTS 647 Hydraulic Wedge Grip and an 810 Material Test System. The specimens had strain gages with a Wheatstone bridge to collect data such as time, distance, load, axial strain, and transverse strain in volts which was converted into pounds per force (lbf), pressure (psi), and etc. for data analysis. From the strain gages, evidence can support how and when the specimen material failed under the stress being applied to the specimen. The test would extend…

travel is increasing, it places a pressure on the aerospace industry to improve material performance and the efficiency of their transportation.2 Classically aircraft were constructed from metallic materials such as aluminium and titanium. Therefore, new materials must have specific properties and characteristics that the metallic materials possess, but in addition, present further beneficial properties. Aeronautical materials must possess a high Young’s modulus to prevent shape deformation…

which prevents corrosion by blocking oxygen diffusion to enter the passive layer and spreads rust into the internal material. As seen in Figure 1, stainless steel rather than forming a rust layer like other carbon steels, it produces an macroscopically invisible layer in which protects against rusting. [2] Figure 1: Stainless steel compared to other non-rust protection material Given that there…

Plastics (Phenolic resins, Epoxy resins, Polyesters and Polyurethanes) are materials which make up the objects which we use in our everyday lives such as phones, cars, cooking utensils, computers and shoes, (http://www.slideshare.net). Plastics are a group of material which can either be synthetic or naturally occurring. Plastics are considered as polymers a substance which has a molecular structure with a large number of units bonded together, (http://www.chemheritage.org). Most plastics are…

is of the total weight of the material. It is one of the parameters used to characterise it. In the D 80 were used the particle sizes below which lie 10%, 50% and 90% by mass, or is, D 10 , D 50 and D 90 , respectively. Another parameter was not the coefficient uniformity (CNU). The higher the value, the greater the grain band and present highest rated is the material. Furthermore, when the non-coefficient uniformity is less than 2, it can be said that the material has a uniform particle size…