Determination of true stress-strain data using spherical indentation techniques

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Traditional methods for obtaining the mechanical properties of materials, i.e. the true stress-strain data, require the use of a tensile testing machine. This instrument which is used to pull apart a test specimen is bulky and expensive and requires large amounts of material. Precisely machined test coupons from the material are needed and each sample can only be tested once. The indentation technique is an alternative solution that provides true stress-strain data comparable to those obtained by traditional tensile tests. Stackpole International, a premier manufacturing company located in Ancaster, Ontario, wishes to investigate the indentation technique on various power metallurgy samples, as well as test the effect of indentation size on the accuracy of stress-strain data received. The company will benefit greatly from this technique, as it will provide a quick method for obtaining material properties without the need for expensive sample machining and tensile testing methods.