几何参数对钛合金蜂窝夹层结构比强度的影响
Influence of geometrical parameters on specific strength of Ti-based alloy honeycomb unit
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摘要: 试验研究了钛合金蜂窝夹层结构的几何参数(蜂窝芯格内切圆直径D和胞壁厚度t)对密度和拉脱强度的影响.芯格内切圆直径较大且胞壁厚度较薄时,焊接界面易于产生组织状态差异较大、组织状态不连续的现象,即魏氏体组织、网篮组织和双态组织并存,严重影响界面强度.当D=11.2 mm时,试件抗拉强度可表示为Rm=118.8 t胞壁厚度-3.44;当D=6.4 mm时,试件抗拉强度可表示为Rm=262.8 t胞壁厚度-5.94.试验中比强度较高且密度较低的蜂窝芯规格为TC1-4.8-0.05-15.密度、强度与几何参数之间的定量关系可用于对蜂窝夹层试件的比强度进行估测,为工程用钛合金蜂窝夹层结构的几何参数优选提供参考.Abstract: The influence of the geometrical parameters, the inscribed circle diameter D and the cell wall thickness t,on the density and strength of the honeycomb unit made with Tibased alloy was investigated.It was found that when D was large and t was thin, the microstructure of the weld interface was discontinuous and differed in grain sizes,which would seriously deteriorate the strength of the honeycomb unit.The unit strength could be expressed as σ=118.8×t-3.44 when D was 11.2 mm, or σ=262.8×t-5.94 when D was 6.4 mm.High specific strength was obtained with D as 4.8 mm and t as 0.05 mm.The quantitative relation between the geometrical parameters and specific strength could be estimated by the specific strength of the honeycomb unit with Ti-based alloys.
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Keywords:
- Ti-based alloy /
- honeycomb /
- geometrical parameter
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