Stress-strain curves are fundamental properties to study characteristics of materials. Flow stress curves of the powder materials are obtained by indirect testing methods, such as tensile test with the bulk materials and powder compaction test, because it is hard to measure the stress-strain curves of the powder materials using conventional uniax- ial tensile test due to the limitation of the size and shape of the specimen. Instrumented nanoindentation can measure mechanical properties of very small region from several nanometers to several micrometers, so nanoindentation tech- nique is suitable to obtain the stress-strain curve of the powder materials. In this study, a novel technique to obtain the stress-strain curves using the combination of instrumented nanoindentation and finite element method was introduced and the flow stress curves of Fe powder were measured. Then obtained stress-strain curves were verified by the com- parison of the experimental results and the FEA results for powder compaction test.

• 정혁재(Department of Materials and Engineering, Pohang University of Science and Technology) | Hyeok Jae Jeong
• 이동준(Department of Materials and Engineering, Pohang University of Science and Technology) | Dong Jun Lee
• 윤은유(Korea Institute of Materials Science, Light Metal Devision, Materials Deformation Department) | Eun Yoo Yoon
• 이언식(Research Institute of Industrial Science and Technology) | Eon Sik Lee
• 김낙준(Graduate Institute of Ferrous Technology, Pohang University of Science and Technology) | Nack Joon Kim
• 김형섭(Department of Materials and Engineering, Pohang University of Science and Technology) | Hyeong Seop Kim Corresponding Author