Nobody downloaded yet

Lab report - Essay Example

Comments (0) Cite this document
Summary
REPORT Experiment Aim The experiment was conducted with the objective of analyzing the stress-strain curve of polymers under the effect of tensile loading (i.e. tensile force application). The testing was done on four different specimens: PE (polyethylene – from a shopping bag), PP (polypropylene – from plastic folder), Rubber (natural rubber – from a rubber band) and Acetate (cellulose acetate – from an overhead transparency)…
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER96.6% of users find it useful
Lab report
Read TextPreview

Extract of sample
"Lab report"

Download file to see previous pages The method of tensile testing is conducted by a ‘tensile testor’ in which the test specimen is clamped and loaded and subjected to a tensile force until the point of failure. ‘Stress-strain curves are an extremely important graphical measure of a material’s mechanical properties’ (Roylance, 2001). Stress is defined as the force of resistance offered against the deformation and Strain is defined as the ratio of the change in length to the original length of the member (Ramamrutham, 2003). The stress-strain curve for the specimen is an important method of characterizing the behavior of the material and adjudging its suitability as a material for any function. Almost all the materials, obey Hooke’s law in the early portion of the curve i.e. at low strain which states that stress is proportional to strain with the constant of proportionality being the Young’s modulus, E: Stress = Strain ? Young’s Modulus. As the strain increases, the linear proportionality comes to an end at a point termed as the proportional limit and marks the beginning of the plastic phase rearrangement of the specimen. Plasticity requires molecular mobility and materials lacking this mobility are usually brittle rather than ductile. “Polymeric materials behave both as viscous fluids as well as elastic solids. They are viscoelastic materials” (Koustos, 2002). The stress-strain curve of a polymer is different from those of other materials. The critical point in the stress-strain curve is the yield point beyond which the material enters the plastic deformation state. Experimentation The experiment was conducted to obtain the stress-strain curve of polymer samples and study their behavior under the application of tensile force. For this test, polymer samples were loaded and clamped in the tensile testing machine. The tensile testing machine that was used was Instron 1026. The tensile testing machine pulls the sample from both ends and measures the force required to pull the specimen apart and how much the sample stretches before breaking. The testing was done on four different specimens: PE (polyethylene – from a shopping bag), PP (polypropylene – from plastic folder), Rubber (natural rubber – from a rubber band) and Acetate (cellulose acetate – from an overhead transparency). The specimens were obtained by cutting the polymer samples into appropriate lengths. The thickness and width of the samples were measured before stretching each one of them and putting them in the tensile tester. The dimensions of the specimens are taken with the aid of calipers for precision. Results and Discussion The stress-strain curves for the various test specimens are as follows: Figure 1: Stress-Strain Curve of Rubber (Poly-Isoprene) Figure 2: Stress-Strain Curve of Acetate (Cellulose Acetate) Figure 3: Stress-Strain Curve of PE (Polyethylene) Figure 4: Stress-Strain Curve of PP (Polypropylene) S. no. Test name Tensile Strength (MPa) Elongation at failure 1 PE 11.1 26% 2 PP 23.5 738% 3 Rubber 4.1 575% 4 Acetate 1 181.9 131% 5 Acetate 2 297.3 114% 6 Acetate 3 166.9 93% It can be observed from the graphs that the stress-strain curve of acetate was obtained thrice. The possible explanation for this can be that cellulose acetate exhibits different tensile strengths at different states – dry, wet & after being boiled (Stadlinger). The difference in ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“Lab report Essay Example | Topics and Well Written Essays - 1000 words”, n.d.)
Lab report Essay Example | Topics and Well Written Essays - 1000 words. Retrieved from https://studentshare.org/chemistry/1436992-lab-report-
(Lab Report Essay Example | Topics and Well Written Essays - 1000 Words)
Lab Report Essay Example | Topics and Well Written Essays - 1000 Words. https://studentshare.org/chemistry/1436992-lab-report-.
“Lab Report Essay Example | Topics and Well Written Essays - 1000 Words”, n.d. https://studentshare.org/chemistry/1436992-lab-report-.
  • Cited: 0 times
Comments (0)
Click to create a comment or rate a document
CHECK THESE SAMPLES - THEY ALSO FIT YOUR TOPIC
Lab report
...?Lidia M. Lujan Lab report W14s1 Debate on Global Warming: Scientific Basis Global warming refers to the increase in the temperature of the earth's surface and troposphere. The term global warming is used interchangeably with “climate change,” referring to the other climatic changes aside from or due to increased global temperatures. The change in temperature is attributed directly due to increased in emission of greenhouse gases, largest concentration of which is carbon dioxide. The increased emission arises from human activities in the transport and energy sector (US Environmental Protection Agency). Other human activities like clearing of land, deforestation, and desertification that abet temperature...
3 Pages(750 words)Lab Report
Lab report
...Running head: RECYCLING ALUMINUM TO ALUM Recycling Of Used Aluminum Cans to Alum: A Study Affiliation Introduction Aluminum and its alloys find several applications today, right from soda cans to aircraft material. This is because aluminum is versatile and has many desirable properties: light weight, nontoxic, pleasing appearance, ability to take high polish, high electric and thermal conductivities, corrosion resistance, malleability, ductility, non-magnetic, and non-sparking. (Greenwood & Earnshaw, 1997) Aluminum combines with other metals to give alloys with high mechanical and tensile strengths. The abundance of its ore makes aluminum and its alloys easily available - Aluminum comprises 8.3% by weight of the earth’s crust... head:...
2 Pages(500 words)Essay
Lab report
...SUMMARY SHEET Physics Laboratory Report -- Equilibrium of a Rigid Body Objective To be able to determine the center of gravity of a rigid body andpositions of weights with reference to that center that would establish equilibrium of forces and torques Method Obtain the weight (in Newton) of the meter stick and the average weight of the three meter stick clamps. Balance the meter stick in one of the clamps to determine its center of gravity. Place a clamp on one end of the stick to carry a 100-gram weight and slide the stick through the supporting clamp to locate the balance (position of the axis of rotation). Then place another clamp with a 200-g suspension and repeat the same previous step. Record positions with respect...
3 Pages(750 words)Lab Report
Lab Report
... Last 4 digits of ID: 7989 Section: Lab Spring Laboratory 7:  Ecological Niche (15 points) Part I: Definitions and Backgroundinformation 1. The niche of an organism is the overall interactions of an organism with other organisms and its range of needs (Properties of microbes). 2. Organisms might compete for food, light, and space. 3. Evolution is the process of gradual development of organisms from simple structures to intricate forms over time. Competition affects the process of evolution in that the organism that is able to compete favorably for the available resources survives and continues to thrive, whereas the organism that cannot compete favorably dies and becomes extinct. Part II: Results Table 1: Effects of Temperature...
1 Pages(250 words)Lab Report
Lab report
..., which causes floods and changes in temperature also supported our program since it would help reduce death rates in Africa. This was conducted on our face book page, where we contacted various special programs personnel’s in different African countries who endorsed our program. Works Cited Innovas. An Industry Analysis. 2010. 2012 . Levy, Charles. "2020 Low Crabon Economy." A knowledge Economy Report (2010): 1 of 76. Nesta. Innovation Experts. 2009. 2012 . Neuhoff, K. Tackling Crabon. Cambridge: University of Cambridge, 2008. Office, National Audit. European Union Emission Schemes. 2009. 2012 . Program, United...
1 Pages(250 words)Essay
Lab report
...Lab report Prediction of the Maximum Height Travelled By a Model Rocket The determination of rocket field is useful when in the quest for determining how high a rocket flies, at a given moment. In this lab, the major objective was to predict how high a rocket model could fly once launched. This involved acquiring a model rocket, then launching it to determine the figures for the various variables. Another related objective was to apply equations for basic projectile motion in determining how high a rocket can fly. Since launching the model rocket, this is considered a projectile motion influenced by height of launch pad, gravity and velocity imparted by the engine. Consequently, there...
3 Pages(750 words)Lab Report
Lab Report
...Lab Report Introduction This experimental procedure comprises a set of activities that serve to instill and develop students’ technical skills concerning measurement, hand sketching, and creation of CAD drawings. Using a vernier calipers and a micrometer screw gauge as high precision measuring tools, internal and external measurements of a Duplo block were to be determined. Additionally, measurement features and precision aspects of these instruments were reviewed for familiarity. Sketching and outlining drawings of this Duplo block entails a combined application of techniques in engineering that aid in manufacture of objects, with Duplo block as a sample (Benedettelli, 2014). Like any other laboratory...
4 Pages(1000 words)Lab Report
Lab report
...while in the case of measurement 2; it is 1.59m/s. 3 This lab experiment is relevant to many scenarios in life. When an object travels in the circular motion, its speed is constant which implies that the magnitude of the objects velocity is not changing while the direction changes. On a practical sense, the activity of driving around a curvy road is equivalent to this lab experiment. For a constant speed, tighter curves tend to generate a greater centripetal acceleration provided by the friction between the tires and the road. This can be described as follows: for steady speed, the equation of centripetal force has it that acceleration is indirectly proportional to the radii of the curve. When a car...
3 Pages(750 words)Essay
Lab report
.... A normal pendulum with a few modifications can be used to achieve similar objectives. In this case, a zero position for the pendulum is identified. Since many labs are done on tabletops, the table top is assigned to be the zero height (mean) position. If the tabletop is designated the zero position, then the PE of an object is dependent on its relative height from the tabletop. Therefore, by obtaining the mass of the pendulum and its relative height from the table top, the gravitational potential energy can be calculated follow: PE = mass x relative height x Gravitational pull = mgh 2. As a car goes over a rough road or bumps, the spring in its shock-absorber setup is compressed, but the...
3 Pages(750 words)Essay
Lab report
... suspects of sodium and potassium poisoning in criminal investigations. Bibliography Battefort, F. et al., 2012. Suicide Attempt by Intravenous Potassium Self-Poisoning: A case Report. Case Reports in Emergency Medicine, pp. 1-3. Bosse, G. M., Platt, M. A., Anderson, S. D. & Presley, M. W., 2011. Acute oral potassium oversode: the role of hemodialysis. Journal of Medical Toxicology, 7(1), pp. 52-56. Chawla, R., 2003. Practical clinical biochemistry: methods and interpretations. 3rd ed. New Delhi: Jaypee Bros. Medical Publications. Kupiec, T. C., Goldenring, J. M. & Raj, V., 2004. A non-fatal case of sodium toxicity. Journal of Analytical Toxicology, 28(6), pp. 526-8.... Sodium and potassium are cations that are found in the extracellular...
6 Pages(1500 words)Lab Report
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Let us find you another Essay on topic Lab report for FREE!
logo footer
Contact us:
+16312120006
Contact Us Now
FREE Mobile Apps:
  • StudentShare App Store
  • StudentShare Google play
  • About StudentShare
  • Testimonials
  • FAQ
  • Blog
  • Free Essays
  • New Essays
  • Essays
  • Miscellaneous
  • The Newest Essay Topics
  • Index samples by all dates
Join us:
Contact Us