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时间相关断裂
相关语句
  time dependent fracture
     C*is one of the important crack tip pararneters for time dependent fracture rnechanics and h1 is thecorrection coefficient in the equation for calculating C*. Under high creep exponent n,divergence or long calculatingtime are the difficuIties in determining the correction coefficient.
     C ̄*以是时间相关断裂力学中的一个重要的裂纹尖端参数,系数h_1是C ̄*的解析表达式中一个计及零件形状的修正系数。
短句来源
     The infouence of material mismatch on the stress field and the time dependent fracture mechanics parameters of uniaxial welded specimens is studied in the present paper. The applicability of conventional C *equation based on the load line displacement is reexamined.
     作者研究材料性能不匹配对单轴带焊缝试样的应力场及时间相关断裂力学参量的影响 ,检验了基于加载线位移的C 估算公式的适用性。
短句来源
  “时间相关断裂”译为未确定词的双语例句
     Introducing a parameter C t ,av for measurements of creep crack growth is suitable.
     介绍了时间相关断裂力学有关的裂纹尖端参数,指出用参数Ct,av作为衡量蠕变裂纹扩展的参数是适宜的;
短句来源
  相似匹配句对
     Time is...
     时间
短句来源
     Time
     时间
短句来源
     Time-dependent fracture is considered.
     本文研究了时间相依性断裂
短句来源
     TIME-DEPENDENT FRACTURE AND DAMAGE
     时间相依性断裂和损伤(英文)
短句来源
     The time-dependent spectra of photoeleotron are calculated.
     计算了光电子的时间相关谱.
短句来源
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  time dependent fracture
The concept of pseudo fracture energy has been introduced to better account for nonlinear and time dependent fracture in HMAs.
      
Conservation law of J integral type for non-stationary time dependent fracture mechanics
      
High-speed photography was also employed to identify the initiation and progression of failure and record the time dependent fracture process.
      
In the medium range of ΔK the fatigue crack growth rates are frequency and waveform dependent, indicating a strong creep-oxidation time dependent fracture mechanism.
      


C*is one of the important crack tip pararneters for time dependent fracture rnechanics and h1 is thecorrection coefficient in the equation for calculating C*. Under high creep exponent n,divergence or long calculatingtime are the difficuIties in determining the correction coefficient.Sorne measures are adopted in order to overcomethese difficuIties. The calculated results of h1 for n=30;40,50;60 and α=W=0.375;0.500;0.625 are given.

C ̄*以是时间相关断裂力学中的一个重要的裂纹尖端参数,系数h_1是C ̄*的解析表达式中一个计及零件形状的修正系数。在高蠕变指数条件下,确定h_1的计算过程或是不易得到正确结果,或是耗时冗长。文中采取某些措施克服上述困难,求得了蠕变指数等于30、40、50和60时不同a/W的h_1值,使得C ̄*的解析表达式可以推广应用到更多的材料。

For safety operation of steam pipes, turbine rotors, etc. in power plants, to determine the growth rate of fatigue crack is important. Based on the theory of time dependent fracture mechanics, a method for calculating creep crack growth rate is presented, including the parameters at crack tip related to time dependent fracture mechanics. Introducing a parameter C t ,av for measurements of creep crack growth is suitable. The influence of fatigue on creep crack growth has been discussed, of which the main...

For safety operation of steam pipes, turbine rotors, etc. in power plants, to determine the growth rate of fatigue crack is important. Based on the theory of time dependent fracture mechanics, a method for calculating creep crack growth rate is presented, including the parameters at crack tip related to time dependent fracture mechanics. Introducing a parameter C t ,av for measurements of creep crack growth is suitable. The influence of fatigue on creep crack growth has been discussed, of which the main factors are depended on the fatigue yield limit and creep resistance of materials. The calculation formulas of creep crack growth rate are also provided.

为了保证火电厂的蒸汽管道、汽轮机转子等零件的安全运行,确定疲劳裂纹的扩展率有重要意义。根据时间相关断裂力学的理论,提供了一种计算蠕变扩展率的方法。介绍了时间相关断裂力学有关的裂纹尖端参数,指出用参数Ct,av作为衡量蠕变裂纹扩展的参数是适宜的;讨论了疲劳对蠕变裂纹扩展的影响,指出材料的疲劳屈服极限和抗蠕变能力是决定这种影响大小的主要因素;并给出了蠕变裂纹扩展率的计算公式

The basic assumption in the derivation of the high temperature fracture mechanics parameters is the homogeneity of materials.However,the material inhomogeneity introduced by welding is inevitable in engineering practice.How to charcterize the creep crack growth with appropriate fracture mechanics parameters is rather challenging to the structural integrity assessment in the presence of weld interface.The infouence of material mismatch on the stress field and the time dependent fracture mechanics parameters...

The basic assumption in the derivation of the high temperature fracture mechanics parameters is the homogeneity of materials.However,the material inhomogeneity introduced by welding is inevitable in engineering practice.How to charcterize the creep crack growth with appropriate fracture mechanics parameters is rather challenging to the structural integrity assessment in the presence of weld interface.The infouence of material mismatch on the stress field and the time dependent fracture mechanics parameters of uniaxial welded specimens is studied in the present paper.The applicability of conventional C *equation based on the load line displacement is reexamined.It is found that under the extensive creep condition C * value of hard weld/soft parent metal specimen can be significantly higher than that of single weld metal specimen,and the material mismatch has little infouence on C(t ) in small scale creep in the studied cases.It is proposed that the C * formula based on the load line displacement recommended by ASTM E1457 needs to be modificd to interpret the creep crack growth (CCG)behavior of welded specimens.

目前高温断裂力学参量的推定主要是基于材料均匀性的假定 ,但在工程实际中却无法回避由焊接引发的材料不均质问题。在存在焊接界面的情况下 ,如何得到可靠的高温断裂力学参量以合理描述蠕变裂纹的扩展 ,是结构完整性评价所面临的挑战。作者研究材料性能不匹配对单轴带焊缝试样的应力场及时间相关断裂力学参量的影响 ,检验了基于加载线位移的C 估算公式的适用性。计算表明在大范围蠕变条件下带硬焊缝试样的C 值比单一焊缝金属的C 值要高得多 ,而在小范围蠕变条件下材性不匹配对C(t)的影响极小。为此建议对ASTME145 7推荐的C 计算式进行修正 ,以正确演绎焊接试样的蠕变裂纹扩展行为。

 
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