摘要
计算分析指出对于以滑移为基本变形机理的镍基单晶合金,受拉扭外载的薄壁圆筒试样其滑移分切应力沿周向不再均匀分布,平板剪切试样其受剪面处于正应力和剪应力共用作用,都不适宜作为复杂应力状态试样。带缺口双剪试样适合于模拟复杂应力状态,但缺口的大小和形状影响受剪面的应力分布。本文在数值计算的基础上,给出了最适宜的试样尺寸及变形量的计算公式;针对国产DD3单晶,进行了初步的试验。
Based on the anisotropic crystallographic finite element analyses, some mulitiaxial stress specimens are considered. The thin-walled tubular specimens and plate shear specimens are not suitable for the single crystal superalloys, owing to the single shear stress state could not be occured. With a special sizes, thenotched double shear specimens can he used to model the multiaxial stress stares. In this paper, the size of the specimen has .been analyzed, and the analytical equations for resolved shear stress and shear strain are presented. The experimental results of double shear tests show that there are striking dependence of creep behavior on crystallographic orientations in the multiaxial stress states.
出处
《航空材料学报》
EI
CAS
CSCD
1997年第2期45-49,共5页
Journal of Aeronautical Materials
基金
国家自然科学基金
航空科学基金
西安交通大学力学开放实验室基金
关键词
镍基合金
单晶合金
复杂应力状态
试样型式
multiaxial stress state, specimens, nickel-based single crystal superalloys