混合モード下き裂の破壊基準 : 第1報, 引張荷重下の二次元傾斜き裂の破壊に基づく検討

概要

論文の詳細を見る
This paper purports to study the fracture criterion of a mixed-mode crack and to demonstrate that the criterion based on the CED (crack energy density) is available from completely elastic fracture to elastic-plastic fracture in a unified way. The CED in an arbitrary direction, ε_ψ, is defined as the quantity which has the meaning of strain energy area density in the plane containing a crack front line without any restrictions on the constitutive equation. We may expect that a mixed-mode Crack begins to grow in the direction ψ where ε^I_ψ (the mode I contribution of ε_ψ) takes the maximum value, ε^I_<ψmax> when ε^I_<ψmax> reaches a critical value peculiar to a material (we call this criterion the ε^I_<ψmax> criterion). First, the applicability of this ε^I_<ψmax> Criterion to elastic fracture is shown through the Comparison between the results of the ε^I_<ψmax> criterion and the results of other criteria and experiments. Subsequently, fracture experiments of specimens of aluminum alloy with a crack inclined to the loading axis are carried out, and it is demonstrated that not only fractures with a relatively small yielding region but also fractures with a large yielding region can be explained by this ε^I_<ψmax> criterion.
一般社団法人日本機械学会の論文
1991-10-25