Abstract
The uniaxial tensile properties of metallic materials can be determined by representing the indentation stress and strain by the load/depth parameters from instrumented indentation tests using a spherical indenter. Here we propose a modified algorithm for evaluating the tensile properties of Ti alloys with low E/ σ y values by taking into account the plastic constraint effect in low-strain regions. The ratio of elastic modulus to yield strength, E/ σ y , can be interpreted as a measure of the amount of deformation plastically accommodated during indentation. For low E/ σ y materials, deformation is elastic-dominated, so less constraint occurs than in high E/ σ y materials. Finite element methods and spherical indentation tests were used to explore the constraint effect for a variety of materials characterized by different E/ σ y . The constraint factors were plotted as ( E/ σ y )( a/ R) based on expanding cavity model. The modified approach was experimentally verified by comparing tensile properties from uniaxial tensile test and instrumented indentation tests.
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