θプロジェクション法による応力急増後のクリープ曲線推定

概要

論文の詳細を見る
The θ projection concept was proposed to describe a wide range of creep curve shapes, and has been mainly studied for ferritic steels in which applied stresses were kept constant until rupture. In this paper, we examined whether it could also predict creep behavior when the applied stress was changed during creep deformation. Conventional creep tests of an austenitic stainless steel were conducted at 700℃. In a series of stress-change creep tests, the initial stress of 90 MPa was loaded for a given test duration, after which the stress was increased to 140 MPa. Creep strain produced by the initial stress was determined to range from the primary to the tertiary stage of creep. Employing the θ projection concept and the strain hardening law, creep behavior after the change of the applied stress was estimated. Estimated creep curves agreed well with experiments when the creep strain due to the initial stress was within the early part of the tertiary stage.
社団法人日本機械学会の論文
1995-07-25