Kohji Kato

STUDY ON THE DEFORMING PROPERTIES OF THE MODEL ASPERITY OF SUS304 AT ELEVATED TEMPERATURES

In this paper, the deforming properties of the model asperity of SUS304 were researched experimentally at elevated temperatures when the asperity was flattened by a flat punch. The shape of the asperity was a two-dimensional wedge. The asperity angle 2θ was 100°, 120°, 140° or 160°, and the temperature range was from 200°C to 600°C. The load to flatten the asperity was constant throughout the experiment. Two ways of loading were adopted to flatten the asperity with a flat punch : one was that the asperity was flattened again at an elevated temperature after being flattened at room temperature ; and the other was that the asperity was flattened only at an elevated temperature. The former is called the condition of loading at room temperature and the latter is called the condition of not loading at room temperature. The deformation of the asperity increased with a rise in the temperature. The deformation under the condition of not loading at room temperature was larger than the one under the condition of loading at room temperature. The real contact pressure decreased with an increase of the asperity angle. The deforming properties are discussed in more detail.