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"Ultimate Tensile strength", is measured as the number of Kilogram of force needed to fracture a 'unit' of Area of the material.

If you choose to use the Units of Kg for the force , and the Unit of Square Cm for the area; then the answer will be in Kilogram per Square Centimetre. You will now realise that it is NOT practical to measure tensile strength of paper because paper is extremely thin and it is not possible to make a piece of paper with an area of 1cmX 1 cm. Paper is usually about one twentieth of a mm thick. However, it you cut a strip of paper exactly 1 cm wide, from a telephone book with the pages clamped very tightly together between 2 strips of wood, and the stack of strips were exactly 1 cm thick; then you would have an area of SOLID paper which would be 1 cm X 1 cm. Now hang weights on it until it breaks apart. The Tension you created on the 1 square cm would be your answer.

Different types and qualities of paper will give very different results. In the same way , different types of steel have very different Tensile Strengths. Talk to an Engineer and he will explain the different between 'Ultimate' tensile strength, and 'Safe Working' tensile strength. Steel is an Elastic substance just like rubber, but it Ultimately stops stretching and breaks when its Ultimate tensile strength is reached.

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12y ago
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14y ago

If you know the specific type you can look it up in a handbook or product data sheet. If you do not know it, you can test a specimen with specific cross sectional area by pulling on it with a tensile testing machine that has a calibrated load cell. When it fails you calculate the tensile strength by dividing the measured failure load by the known area.

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11y ago

After plotting the graph appropriately, you set the highest tensile strength as the highest stress value. You then divide by the other points to find the true value.

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Q: How do you calculate points for a tensile strength versus composition graph?
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