The Stress-Strain Relationship in Powder

We have measured the shear stress-strain and the vertical normal strees-strain relations by using a shear and compressive load tester. As the result, we found that G=dτ/dγ (modulus of elasticity in shear) depends upon the particle or aggregate configuration of the powder, and the value of G is much smaller than the value of the mother material. For the compressive load test, the adhesive powder becomes harder with increase in stress, while the non-adhesive powder yields more easily. It is important to consider these characteristics through the process of finding the powder constitutive equation.