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3 results

  • 5 - Tensile Testing

  • T. W. Clyne, University of Cambridge, J. E. Campbell
  • Book:
    Testing of the Plastic Deformation of Metals
    Published online:
    24 May 2021
    Print publication:
    10 June 2021, pp 81-106

  • Summary

    The uniaxial tensile test is the most commonly used mechanical testing procedure, and indeed it is in very widespread use. However, while it is simple in principle, there are several practical challenges, as well as a number of points to be noted when examining outcomes. For example, there is the issue of converting between nominal (“engineering”) and true values of the stress and strain. While many stress–strain curves are presented, and often interpreted, only as nominal data, it is the true relationship that accurately reflects the mechanical response of the sample. Furthermore, conversion between nominal and true values is straightforward only while the stress and strain fields within the gauge length of the sample are uniform. This uniformity is lost as soon as the sample starts to deform in an inhomogeneous way within the gauge length, which most commonly takes the form of “necking.” After the onset of necking, which may be quite difficult to detect and could occur at an early stage, useful interpretation of the stress–strain curve becomes difficult. However, FEM modeling does allow various insights into the behavior in this regime, with potential for revealing information (about the fracture event) that is otherwise inaccessible. There are also several important points relating to the way that the strain is measured during a test.

  • Interlaboratory proficiency testing of tensile and flexuraltesting for cellulose based transformed board material

  • B. Aydemir, S. Fank
  • Journal:
    International Journal of Metrology and Quality Engineering / Volume 3 / Issue 2 / 2012
    Published online by Cambridge University Press:
    14 November 2012, pp. 67-70
    Print publication:
    2012

  • Optimum safety and reliability can be achieved by coordinating an interlaboratoryproficiency testing among different laboratories. Testing laboratories need to verifytheir test procedures and testing capability for reliable results. In this study,equivalent samples are prepared by cellulose based transformed board material used intransformers as electrical isolation material. Randomly selected test samples havingspecified dimensions are sent to the participant laboratories. Then they are tested andresults are analyzed according to previously defined parameters. Each laboratory appliedtensile and flexural tests on the samples according to procedures given in IEC 60641-2,2004 and IEC 60763-2, 2007 standards respectively. Test results are evaluated according tosame procedures explained in related standards by the participant laboratories. TUBITAKUME Material Testing Laboratory being the pilot laboratory collected to the all evaluatedresults including associated measurement uncertainties. Then the collected resultsevaluated according to ISO 17043, 2010 are reported by each laboratory as a part of theproficiency test report. Z-scores of the participant laboratories are presented.

  • Calculation of measurement uncertainty for cellulose based transformed board material in tensile testing

  • S. Fank, B. Aydemir
  • Journal:
    International Journal of Metrology and Quality Engineering / Volume 3 / Issue 1 / 2012
    Published online by Cambridge University Press:
    26 September 2012, pp. 15-18
    Print publication:
    2012

  • Today’s global economy obliges manufacturers to produce their products in high quality with cheaper cost. Thus, manufacturers must develop their products applying tests to get better performance and higher quality before distributing them to the competitive market. In order to produce long working life of transformer reactors without losing their performance, different tests including axial and flexural testing are applied on the cellulose based laminated board material used in production. During development of laminated board material, test results should be known very well and the measurement uncertainty of tensile tests should be calculated taking into account all parameters. In this study, effective parameters on the quality of tensile testing causing an increase on the measurement uncertainty are investigated. Tensile strength and elongation test of laminated board material were carried out according to IEC 60641-2 and the uncertainty contributions based on experimental results were calculated. The results and impact of the uncertainty parameters are presented in detail.