The accurate prediction of damage behavior of welded components at high temperature is becoming incresasingly important in order to realize an optimised design and maintenance of a plant life.In the present paper,the ...The accurate prediction of damage behavior of welded components at high temperature is becoming incresasingly important in order to realize an optimised design and maintenance of a plant life.In the present paper,the creep properties of the weld of HK40 furnace tube are determined by means of a local deformation measuring technique.A damage mechanics approach is introduced to simulate the damage development and creep rupture of HK-40 furnace tubes due to the presence of a weld.Metallographical research also indicates that the weld has a higher damage rank.It has been illustrated that damage is prone to the weld in the later period of service life.It is thus concluded that the weldments may become the weak link in HK-40 furnace tubes.展开更多
本文在统计分析大量HK40性能数据基础上,提出了基于K-D法的HK40剩余寿命外推公式:t_r=exp(ā-10.36logσ+12000/T),其中的值:ā=(1/n)sum from l=1 to n(lnt_n-(42000/T_l)+10.36logσ_l)。公式物理意义明确,并得到良好验证。
文摘The accurate prediction of damage behavior of welded components at high temperature is becoming incresasingly important in order to realize an optimised design and maintenance of a plant life.In the present paper,the creep properties of the weld of HK40 furnace tube are determined by means of a local deformation measuring technique.A damage mechanics approach is introduced to simulate the damage development and creep rupture of HK-40 furnace tubes due to the presence of a weld.Metallographical research also indicates that the weld has a higher damage rank.It has been illustrated that damage is prone to the weld in the later period of service life.It is thus concluded that the weldments may become the weak link in HK-40 furnace tubes.
文摘本文在统计分析大量HK40性能数据基础上,提出了基于K-D法的HK40剩余寿命外推公式:t_r=exp(ā-10.36logσ+12000/T),其中的值:ā=(1/n)sum from l=1 to n(lnt_n-(42000/T_l)+10.36logσ_l)。公式物理意义明确,并得到良好验证。