Determination of true stress-strain data using spherical indentation techniques

获得材料力学性能的传统方法，即真实的应力-应变数据，需要使用拉伸试验机。这种用来分离试样的仪器体积庞大，价格昂贵，需要大量的材料。需要对材料进行精密加工的测试片，每个样品只能测试一次。压痕技术是一种替代解决方案，可提供与传统拉伸试验获得的数据相当的真实应力-应变数据。Stackpole International是一家位于安大略省Ancaster的一流制造公司，希望研究各种粉末冶金样品的压痕技术，并测试压痕尺寸对收到的应力-应变数据准确性的影响。该技术将使公司受益匪浅，因为它将提供一种快速获得材料性能的方法，而不需要昂贵的样品加工和拉伸测试方法。

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.