1. OBJECTIVES
• To understand how a mechanical tester works and to acquire the basic skills to operate a mechanical tester.
• To obtain mechanical properties of materials using the tester.
• To reinforce the concepts of mechanical properties of materials through hands-on experience.
• To understand the influence of microstructure on mechanical properties of materials.
2. THEORY
2.1 INTRODUCTION
Mechanical and physical properties of the material determine the potential of a material to meet design and service requirements into proper dimensions. The relationship between forces acting on a material and the resistance of material to deformation and fracture are mechanical properties of a material. The most frequent mechanical test used is the
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3. There is a sudden drop of load occurs at the point in which is called the upper yield point. The constant load is known as the lower yield point and the elongation occurs at the constant load is known as the yield-point elongation. The lower yield point here is used to define the yield strength.
Percent elongation (%EL) and percent reduction in area (%RA) is used to measure the ductility of a material. Both properties occur after fracture.
The slope of the linear portion of the stress-strain curve is the modulus of elasticity or Young’s modulus (shown in Fig. 4.) , it is a measure of the stiffenes of the material and is determined by the binding forces between atoms. The Young’s modulus is material dependent as the type of atomic bonding can’t be changed without changing the basic nature of the material.
2.4 TESTING SPECIMENS The tensile specimen has enlarged ends or shoulders for gripping. The crucial part of the specimen is the gauge section, the width of which is reduced so that deformation and failure can be localized. Gauge length is centered within the reduced section is the region over which measurements are made. For metals, a round specimen is commonly used; for sheet materials (including rolled metal sheet), a plate specimen is generally
Test driving a vehicle will help you to decide how the forklift handles, how well it turns, how well it works in tight spaces, regardless of whether the engine and lifts are sufficiently solid, and so on. By test driving the vehicle you will have the capacity to figure out whether the forklift is quality or not, which is the reason it is so imperative for you to take the utilized forklift for a twist before you purchase it.
The elastic modulus of even amorphous diamond is around 800 GPa which is already much higher than any other MEMS material that is currently ...
These include, high strength, low weight, high chemical resistance and high cut resistance. This material does not corrode or rust and is also unaffected when placed in or under water.
There are issues with the theories though that causes them to be slightly unreliable. Strains can be measured in numerous ways. Every study of general strain theory can look at completely different strains and measure them in different ways. Looking at different strains while implementing different measurement techniques makes determining the accuracy and validity of strain theory to become difficult. Theories need to be empirically tested and replicated to determine their value.
and I started to take it out. They test broken down machinery using computerized diagnostic programing, these particular programs designed to run various tests and find the problem in the machine. It is very important that as an industrial machinery mechanic keeps records of what they repaired, how long it took to repair the machinery, and how much the repair cost. They know how to carry on a conversation about business and talk with others to ask for help when they need it. An industrial machinery mechanic needs to know how to communicate; this is a major part of this particular job.
contains for stresses; there is a strong caesura in the middle of the lines and
This is know as resistivity. The factors I can investigate are : Ÿ Temperature Ÿ Length Ÿ Cross-sectional area/width Ÿ Material (resistivity) The factor I shall investigate is the length of a wire. Background Knowledge Resistance is when electrons travelling through the wire are impeded by the atoms within the wire. Since the electrons are charge carriers when they collide with the atoms in the wire less pass through.
L = Length of the conductor(m). A = Area of cross section of the conductor (m2). = the resistivity of the material of which the conductor is made. (Îm) The experimental determination of the resistivity of a material. involves measuring the resistance of a specimen of the material.
where μ = the Newtonian viscosity and γ = shear rate or the rate of strain.
This is the textbook for my materials science and engineering class. It contains information about the behaviors and properties of materials such as metals and polymers. This source will prove useful because in the field of tensegrity, the type of material used to make a structure is very important. In the field of engineering/tensegrity, this source is considered as a reference
When the object is loaded through spring freely that can be considered as elasticity. The simple elasticity consists of a mass, a mass hanger, a steel spring and a retort stand.
Some examples of mechanical engineering is bridges, dams, buildings, solar energy, and many more. So basically mechanical engineering
Mechanical engineering is a type of engineering which applies principles of physics and material science for the purpose of analyzing, designing, manufacturing and maintaining of mechanical systems (Gorp, 2005). It is involved with the production and usage of mechanical power in the operation of various machines and tools. Mechanical engineering is considered to be the most diverse engineering and has its breadth derived from the need to design tools and manufacture products which range from small individual parts to large systems. Mechanical engineering, as thought of by scholars, is related to Aerospace engineering, Manufacturing and Mechanical engineering (Van et al, 2011).
Experimental Mechanics involves the experimental investigations of the static and dynamic response of structures and machines, and in the development of improved techniques to obtain and analyze experimental data.
Metals are widely use in industrial, economic growth and most importantly our daily life. Metals can be found in our car (steel), cell phones (gold, tin), computers (mercury, lithium), electrical wires (copper) and soda can (aluminium). But what is the prime factor that really determines the quality of metals? I would say TOUGHNESS.