GUO Encai XU Fengqin Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China GUO Encai
,
Dept.No.5
,
Central Iron and Steel Research Institute
,
Ministry of Metallurgical Industry
,
Beijing
,
China
金属学报(英文版)
The creep crack growth(CCG)and the time to carck initiation and rupture of specimen (t_(rc)and t_r)were measured by means of electrical potential method on single edge notched specimens at 700℃.The field near the crack tip under steady-state creep was represented by energy rate integral(C~*),and the CCG rate as a function of C~* has been obtained.The agreement between the predicted and observed t_(rc)values is quite good.It was found that the addition of small amount of Mg and Zr in the alloys causes t_(rc)and t_r of the specimens to in- crease significantly.
关键词:
Ni-base alloy
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null
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null
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null
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null
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null
邓海鹏
,
何柏林
航空材料学报
doi:10.11868/j.issn.1005-5053.2016.4.009
对MB8变形镁合金超声疲劳试样进行设计计算.为了减小试样振幅,使试样产生较少的热量,减轻冷却系统压力的同时防止试样产生相变等组织变化,将试样设计成变截面形状.根据试样振动位移方程、边界条件和位移连续条件推导出试样谐振长度与其他尺寸的关系,计算出一系列超声疲劳试样的尺寸.结果表明:变截面圆柱和板状试样随着圆弧过渡段长度增大,谐振长度减小,圆弧过渡半径增大;对于无中间等截面段试样,位移应力系数Cs和应力放大系数M随着圆弧过渡段长度减小而减小;对于含有中间等截面段试样,位移应力系数Cs和应力放大系数M随着中间等截面段长度减小而减小.
关键词:
变形镁合金
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超声疲劳
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试样
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解析计算
