Summary The objective of this lab is to illustrated the procedures required to perform tensile tests. Using data obtained from the test will enable the student to determine various material characteristics that affect the design process. Some findings/interpretations are the stress vs strain curve will help us show how the metal reacted to the forces applied, and the point of failure is very important as it is the ultimate strength. Introduction To test if a metallic material is viable candidate to be used in the construction of a product the material must pass a tension test. A sample of the material is machined to standard length and dimensions. The sample is placed between an extensometer and stretched mechanically at a known rate. The results of the tensile test are used to determine various properties of a material. It can be determined from these properties if a material is appropriate for any specific application in engineering. Equipment List 1- SATEC material …show more content…
The results all show how metallic materials have elastic and plastic properties which can be observed on the stress vs strain curve. The Results also indicate that denser metal such as steel have greater strength than the lighter materials such as brass. The energy of rupture is in pascals which is also J/m3. Percent Elongation Aluminum: % Elongation = Final Length – Original Length/ Original Length X 100 = 53.72-50.04/50.04 X 100 =7.35 percent Energy of Rupture Total Deformation/ Original Length =
Elastic strain region at small and big end of connecting rod is shown in figure no. 10. The maximum and minimum equivalent strain values are 0.00033975 and 2.1407e-10 respectively. Due to applied pressure there will be change in original dimensions of the connecting rod and hence strain developed can be
For almost as long as civilizations began they have been fighting against each other. Often times these wars come down to who has the better military equipment. When one army creates an elite war machine another army is sure to soon copy or improve it. For example the U.S. Army Signal Corps purchased the first ever military aircraft in 1902 (Taylor). Two years later the Italians were also using aircrafts. The trebuchet catapult is no exception; it was one of the most destructive military machines of its time (Chevedden, 2000). A trebuchet works by using the energy of a falling counterweight to launch a projectile (Trebuchet). In this research paper I intend to explain the history and dynamics of a trebuchet catapult.
This is another property which relates the fatigue to tensile property of any material. It can be defined as the ratio of the endurance limit (Se) to the ultimate strength (Su) of the material of any structure. The value of fatigue ratio ranges from 0.25 to 0.60. It’s value solely depends upon the type of the material.
[14] Genich Taguchi, Subir Chowdhury, Yuin Wu. Taguchi’s Quality Engineering Hand book John Wiley & Sons Inc; 2004.
Towra Point Nature Reserve is a place of many different land habitats. It is located in Southern Sydney, New South Wales, in eastern Australia. It produces the largest estuarine wetland complex in NSW and is a protected nature reserve. It Represents around half of the remaining mangrove area near Sydney, and most of the salt marshes area remaining in the region as well. They are also most likely one of the most major contributors to the food web within Botany Bay and provide habitat for many important fish and different invertebrate species of the bay.
Deviance is a natural part of and necessary for stability and social order in society, this according to functionalist theorist Emile Durkheim (MindEdge, Inc., 2016). Traditionally, society is generally successful in providing motivation for individuals to aspire for goals of some sort, whether through wealth, prestige or perceived power (Henslin, 2011). However, from a functional perspective, theories have been developed in identifying when lawful and equal access is not afforded to certain individuals in the process of obtaining such goals. This restriction and inequality to opportunity for access in the quest to achieve success is what is now referred to as structural strain theory, which was developed by sociologist Robert Merton (Henslin,
Strength is an abstract concept with various meanings. Some meanings are more complex than others. Many people when they hear the word strength think of muscular men who can lift cars or comic book heroes that fly around their city saving people. More exists to the concept than just being muscular. Strength is also shown when one goes through something tough but stays positive and pushes through it anyways. Having strength can mean possessing the ability to accomplish hard tasks because of muscles, being firm or solidly planted in something, or withstanding your own and not giving up or giving in to the opposing force.
Equation 3.3 is utilized for the assessment of the structural torsional stiffness of the handle for its design and analysis. This equation is inputted into the spreadsheet and plotted to look for the coefficient. The coefficient is the structural torsional stiffness, KT of the handle. All values needed for the equation are measured from the handle model in SolidWorks.
During impact most of the impact energy in the test specimen is absorbed as plastic deformation when the test specimen yields. Temperature and strain rate effect the yield behaviour and ductility of the material and hence affect the impact energy. Materials that behave this way usually have body-centred cube crystal structures and where lowering the temperature reduces the materials ductility.
Yield strength (y) (0.2%) is found by drawing a parallel line to the elastic region and the point at which this line intersects with the stress-strain curve is set as the yielding point. The following figure shows the tensile tester that is used to test the samples. Figure 1: Tensile testers. Objective Tension test is carried out to obtain the stress-strain diagram, to determine the tensile properties and hence to get valuable information about the mechanical behaviour and the engineering performance of the material.
Later a new variety of steel material is been used in the industry by the composition of different kinds of steel. The development of this material were used latterly in common for producing hard and high torque screwdriver, most importantly fractures cannot happened in this kind of material. The steel which we were talking about in the beginning was smelted in a high vacuum and forged to the required shape and they are welded in furth...
Figure 12: Material Strength of a welded joint (% parent material strength vs. weld depth for tensile test specimens of constant thickness).
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
Law of elasticity is known as Hooke’s law, showing the relationship between the forces applied to a spring and its elasticity, which states that relationship between small deformation of the object and the displacement or size are directly proportional to loading and the deforming force. According to Hooke’s law, elastic behaviour of solids could explain by the fact that in component ions, molecules, or atoms from normal positions, which is small deformation, are also proportional to the force that causes the displacement. The deforming force might be applied to a solid by squeezing, compressing, stretching twisting, or bending. Accordingly, spring will return to its primary size and shape upon discharge of the load (Tega, 2010).
I want you to think back to what might be the greatest invention ever. Dependant upon how well you know your history you could possibly say the wheel, the car, the airplane, the television, the autonomous robot. All of these are great ideas that have different eras in history, but they all have something in common, these creations were all invented by engineers. Do not get the misconception that engineers have been around since the dawn of time but the concept of engineering itself has. Those great revolutionaries all had ideas and solved problems which are still qualities that engineers of this day and age use. Webster defines engineering as, “the work of designing and creating large structures or new products or systems by using scientific methods.” Those people created new products so they would today be considered engineers, but they are slightly different. What makes them different is the field that they would be considered a part of. The broadest one of the oldest forms is mechanical engineering, which is my future profession.