• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
Page
  1. 1
    1
  2. 2
    2
  3. 3
    3
  4. 4
    4
  5. 5
    5
  6. 6
    6
  7. 7
    7
  8. 8
    8
  9. 9
    9
  10. 10
    10
  11. 11
    11

TENSILE TESTING OF METALS

Extracts from this document...

Introduction

TENSILE TESTING OF METALS Aim: The aim of the experiment is to determine the behaviour in tension of metallic materials. Depending on the material and the production method used to produce the test piece various kinds of responses are possible in extension to the applied load. Introduction: The tensile test provides an estimate of the strength and ductility of metal materials. The test is carried out on a small sample of material according to BS 18 Methods for tensile testing of metals. It should be noted that the results obtained can only be used as a guide to the performance of the material as a whole. The following experiment was designed to determine some of the mechanical characteristics of various materials. These included the stress strain characteristics, such as Young's Modulus, yield strength and tensile strength. I will use the theory of material science to help explain the properties of our samples, and predict the outcome of the results and then compare this to what actually happened once the test is complete. I will take into account how carbon has affected the properties of steel and as has alloying to Aluminum. A lot can be learnt about a substance from tensile testing. By pulling on something, it is possible to determine (very quickly) how the material will react to forces being applied in tension. As the material is being pulled, it is easy to find out its strength along with how much it elongates. ...read more.

Middle

A; 8,400N divided by 20mm2 = 420 F; 10,450N divided by 10mm2 = 1,045 Sample Yield Strength* A 420 F 1045 * All results are in N/mm2 Samples After the Test Analysis of Results In the calculation of breaking or tensile strength, the original cross section area was used (this is known as the nominal stress or the engineering stress). My initial assumption of samples Y and U being based on the same metal aluminum and A, F both based on steel, have resulted in 2 very different results. I would have initially thought that the pair of metals would have acted quiet similar to one another however it wasn't the case. U results varied widely to that of Y and so is the case with metals A and F. - Metal samples A and F Now as established earlier two materials contain carbon, the steel with carbon content, samples A and F. Most steel contains less than 0.35 percent carbon. Plain carbon steels can be grouped into 3 categories; - Mild steel = 0.10 to 0.25% Carbon - Medium carbon steel = 0.25 to 0.5% Carbon - High Carbon steel = 0.50 to 1.5% Carbon * Thus sample A is mild steel and F is a high carbon content steel Carbon is very special because it can form so many compounds. The explanation lies inside the carbon atom. Carbon atoms can form strong links with four other atoms. ...read more.

Conclusion

Sample U has 4% copper alloy, and because of this it has increased strength, however has lost some durability. The result graph show that sample U is a very strong material that will not break easily which means it can withstand large forces, this due to copper added. Aluminium-copper alloys containing 2 to 10% Cu, generally with other additions, form important families of alloys. Copper is the principal alloying element in this sample. These alloys normally require solution heat-treatment to obtain optimum properties. Also artificial aging can be used to further increase the mechanical properties. This treatment materially increases yield strength, with attendant loss in elongation. 10 Conclusion In this experiment, we determined the mechanical characteristics of four unknown samples. Based on collected data we were able to describe such characteristics as relative hardness and stress-strain characteristics. Combining these mechanical properties with the theory of material science, we were able to explain some of the characteristics of our materials and assume their compositions. In conclusion it was evident that the inclusion and alloying metals could alter how ductile they were and their strength. Samples Y and A were the most ductile materials and the Young modulus of Steel (sample F) revealed that it is the stiffest material. Sample F was found to be the strongest material because of its high tensile and breaking strength, however it wasn't very malleable until carbon was added. I feel that the accuracy of the results were satisfactory but they could have been improved by repeating the tensile test several times and taking an average. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Resistant Materials section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Resistant Materials essays

  1. Metallography. The objective of our experiment is to learn specimen preparation techniques in metallography ...

    The three most widely used resins include bakelite, diallyl phthalate, and melamine. Thermoplastic resins also require heat and pressure during molding, but must be cooled to ambient temperature under pressure. Grinding is a method of surface preparation that involves the use of an array of sanding material of increasing fineness, most commonly sandpaper, to prepare the surface for examination.

  2. Recycling of construction materials will make a significant reduction in the environmental impact of ...

    a material for any application it is important to look at the whole of the product's life cycle. Life cycles analysis in fact goes far beyond the production processes alone. It also covers the impacts and benefits of the material throughout the life span of the different products, including its re-use and recycling.

  1. My aim of this experiment is to recognize which material is the greatest sound ...

    o Crocodile clips- This is used to connect the signal generator to the loud speaker so the constant frequency can be produced. o Scissors-This is used to cut up the insulation material o Celloptape-I would apply this to stick the insulation to the card, along with the layers sticking insulation material onto the same material.

  2. Explain Aristotle idea of the four causes.

    Thus, Aristotle concludes that the natural scientist should study enmattered forms. (Physics, 194a25). This analogy to crafts, however, only establishes that the natural scientist should consider both formal and material causes. Aristotle will go on to give arguments for the remaining causes in this chapter, but they are complex and, frankly, poorly understood.

  1. The task has been set to make a hole punch (used to punch holes ...

    The measurements are those below: Round Bar * 3mm * 6mm * 12mm * 25mm * 40mm * 4mm * 8mm * 15mm * 30mm * 5mm * 10mm * 20mm * 35mm Square Bar 6mm sq 12mm sq 20mm sq 35mm sq 10mm sq 15mm sq 25mm sq 40mm

  2. EFFECT OF MOISTURE ON THE MECHANICAL PROPERTIES OF NYLON

    Table 1-1:Nylon market analysis,1962-1970. Consumption in millions of pounds Market 1962 1963 1964 1965 1966 1967 1968 1969 1970 Appliances 3.1 3.6 3.8 4.2 3.0 - 4.9 2.5 - 4.8 5.5 - 8.0 9 9 Autos & trucks 11.5 11 12.5 15.1 11 - 18.5 10.3 11.8 - 13.4 20 26 Consumer products 5

  1. This case history documents events that occurred at the Markham coal colliery in Derbyshire, ...

    As these values of KQ are the only ones we have and the fracture surfaces do not show extensive plastic deformation, I will take the average, approximately 44.5 MN m-3/2, as being KIC for the material. We can calculate the ?=K/Y(?a)1/2 and?=49 MN m-2.

  2. Communication: the Key To Designing Safely.

    In addition it seems that communication is hindered by inflexible procurement contracts and lack of relevant information. INFORMATION AVAILABILITY FOR DESIGN DEVELOPMENT Design entails the combination and balance of ideas generated by the design team, which should reflect the needs of the clients brief.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work