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  2010, Vol. 31 Issue (1): 8-15    
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柔度法研究镍铬合金焊材的高温疲劳裂纹扩展行为
包陈1,蔡力勋1,陈燕2
1. 西南交通大学力学与工程学院2. 哈尔滨焊接研究所
A New High-temperature Compliance Method and Fatigue Crack Growth Behavior of Nickel-chromium Alloy Welding Materials
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摘要 金属材料的高温疲劳裂纹扩展试验,关键问题在于高温环境下精确测量试样的裂纹长度。本文发展了一套基于FFCT试样的高温柔度新方法,同时利用有限元方法对具有分层构形的CT试样的实时裂纹长度计算进行了研究。基于新方法,完成了镍铬合金焊带、焊条和焊丝三种焊材的疲劳裂纹扩展试验。研究表明,新方法用于高温疲劳裂纹扩展试验取得了很好的效果;对于分层构形的CT试样,其等效弹性模量受弹性模量比b、尺寸比m和裂纹长度a的影响,难以获得相应的裂纹长度的显示计算公式,本文发展的实时裂纹长度修正计算方法取得了良好的精度;焊带、焊条和焊丝在常温和350℃下的疲劳裂纹扩展曲线分散性较小;Paris公式中参数C和 m值随温度升高向相反方向变化,其中焊条和焊丝的m值减少,C值增加,焊带则恰好相反;焊带在350℃下的抗疲劳裂纹扩展性能明显低于焊条和焊丝;三种焊材在常温和350℃下的裂纹扩展曲线都存在一个交点。
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关键词 高温柔度法疲劳裂纹扩展镍铬合金焊带焊条焊丝    
Abstract:The key problem for fatigue crack growth rates testing of metallic materials at high temperature is how to measure crack length of a compact tensile (CT) specimen accurately. A new compliance method based on the FFCT specimens at high temperature was developed, and the calculation of the real-time crack length for a CT specimen which contains two different materials was also studied using finite element analysis. According to the new compliance method, a series of fatigue crack growth rates tests for nickel-chromium alloy welding materials at room temperature and 350℃ were carried out. The results show that, the new compliance method can be commendably used for fatigue crack growth rates tests at high temperature. For a CT specimen with layered configuration, its equivalent elastic modulus is affected by the elastic modulus ratio b, height ratio m and crack length a, and it has somewhat difficult to get a explicit expression of the crack length. A developed correct method for the calculation of real-time crack length is proposed, and it presents a nicer precision. The parameters of C and m in the Paris formula vary inversely with increasing temperature. For welding rod and wire, the values of C increase and the values of m decrease, but for welding strip the change of the two parameters is reversed. The crack growth resistance of welding strip is obvious lower than the other two welding materials at 350℃. The crack growth curves of the three welding materials have a point of intersection at room temperature and 350℃.
收稿日期: 2008-11-03     
:  TG115.5+7  
通讯作者: 包陈   
引用本文:   
包陈;蔡力勋;陈燕. 柔度法研究镍铬合金焊材的高温疲劳裂纹扩展行为[J]. , 2010, 31(1): 8-15.
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