Stress Measurement in a Bar Deformed Dynamically to Plastic Range

Abstract

In the present paper, a simple method is presented for measuring dynamic stresses in a bar under impact loading. This method is based on the fact that in a bar under one-dimensional axial stress, there is a singular direction along which plastic strain vanishes, and by measuring the strain in this direction, the axial stress can be obtained. According to the present method, the stress and strain of the plastic wave along a bar with uniform cross section were observed separately. A difference of the mode between the stress and strain waves was clearly observed.