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工程力学  2015 

带中心孔的钛合金扩散连接层合板裂纹扩展特性

DOI: 10.6052/j.issn.1000-4750.2011.08.0516, PP. 244-249

Keywords: 钛合金,扩散连接,层合板,裂纹扩展,疲劳试验

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Abstract:

为了研究含孔TC4钛合金扩散连接层合板的裂纹扩展行为,进行了含?6中心孔的8mm厚单层板材、三层(3+2+3)扩散连接层合板和三层(3+2+3)含?12止焊区扩散连接层合板的疲劳对比试验,试验中施加标识载荷,通过断口判读裂纹形态和尺寸,得到裂纹扩展(a,N)数据,建立了裂纹扩展da/dN-a曲线,对单层板、层合板和止焊层合板的裂纹扩展行为和规律进行了对比。结果表明:单层板出现规则的半椭圆形孔壁裂纹;层合板由于存在层合界面的影响,出现不规则的半椭圆孔壁裂纹;而止焊层合板以角裂纹为主,裂纹扩展过程分为三阶段;三类试件的da/dN-a曲线可用双对数线性关系描述;三层板的裂纹扩展特性不弱于单层板;止焊层合板的裂纹扩展性能有明显改善,提高了含孔层板的损伤容限特性。

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