Materials

Small cracks, cavities, and notches in perfect material can dramatically reduce the tensile strength by producing stress concentration around them [ref]. We believe that in mammalian connective bone tissues, canaliculi, osteocyte lacunae, blood vessels and muscle insertions produce stress concentration to delay the progressive spread of minute cracks. Often times the cracks that are running against lacunae, for examples, stop on entering the lacunae, Hessian canals and blood vessels [ref]. We…

1.1 What is a composite material? Composite materials are materials in which a homogenous matrix is reinforced by a stronger and stiffer constituent that is usually fibrous but may have a particulate or other shape (web.mit.edu). They are produced when two or more materials or phases are used together to give a combination of properties that cannot be attained otherwise. For example steel reinforced concrete, plywood and fibre glass. 1.2 What is a Ceramic Matrix Composite (CMC)? CMCs are a…

(3) The boundary layer mass transfer equation in batch system is as: dq/dt=(3k_f R(C-C_s ))/(D_s ρ(1-ε)) (4) The equation of material balance for slurry adsorption system is studied using…

snow Goggles and All terrain goggles, Food container’s insulation and gaskets etc. Material performs well to the qualitative requirement of troops and is equally good for hot summer in desert as well as in extreme cold up to -50oC in glacier regions. Certain properties of the…

grandma. The headband itself might be very cheep and easy to break, the surfaces of it already falling off, but the connotation of the object is irreplaceable. This is like the argument Purbrick made in her paper “The Emotion of Material Culture” that "To consider material forms as repositories of affection, not just desire" (Purbrick 11). That is especially true in my case because I value my headband by the memories, not even its purpose as a…

2.9 Material Properties 2.9.1 Hardness Test Hardness is defined as a measure of a material’s resistance to contained plastic deformation (e.g., a small dent or scratch). Hardness testing comprises a small indenter being enforced into the surface of the material being confirmed under organized circumstances of load and rate of application. The depth or size of the resulting indentation is measured, which in turn is linked to a hardness number; weaker the material, indentation will be the…

characteristics of hazardous materials stored in stationary tanks and facilities. The system is known as NFPA 704 and uses diamond shaped placards with blue, red, yellow and white to denote different levels of hazards for each category. Blue denotes the hazards to health with a number system from least to most severe, red denotes a fire hazard, yellow is an…

one of those fields being genetics. Geneticists use the information they collect to help decide traits that are passed on. Meaning, they study how and why organisms end up with blue eyes color or cancer. What is the role of the genetic material? Genetic material or DNA provides the blueprint for all living organisms. Museum of the Future, (N.D.) Genetics is undoubtedly responsible for the biological makeup, of all organisms, but this wasn’t always the case. Prior to that era, DNA was nothing…

Metallic bearings Steelair’s bimetallic bearing represents advancement in bearing technology and it can be assembled, accustomed or soldered into place. Along with high load capacity and good fatigue properties, it is also an excellent wear-resistant material. The bimetallic bearing is the composite of low friction copper alloy and is perfect for use when provided with excellent requisite strength and the finest carrying capacity by means of derived remains and secondary wedging technology. It…

A Few Options To Consider When Buying A New Asphalt Shingle Roof When it's time to put a new roof on your home, you'll likely go with asphalt shingles, especially if you currently have asphalt now. That's because this roofing material is less expensive and therefore more popular than other types of roofing. If you take a look around your neighborhood, your likely to see most of the homes have asphalt shingles no matter what climate you live in. However, just because you choose asphalt, it…