Shear Characteristics of Powder Compact by Using Improved Single Shear Test

An improved single shear test is carried out to investigate shear characteristics of metal powder compact. By this experimental procedure, relation between the normal stress and shear stress at shear plane can be measured directly by shearing the powder compact at single plane with various normal stresses. Iron powder and stainless powder are tested and their shear fractures are investigated. Shear characteristics are evaluated by approximating relation between critical nominal friction coefficient and relative normal stress, where the relative normal stress is derived as the ratio with forming pressure and normal stress. As the result, the critical nominal friction coefficient at shear failure plane increases with increasing compact density, but it can be expressed without density dependence as a function of relative normal stress. Therefore the shear characteristics of powder compact with various compact densities can be expressed by this approximation.