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防止压力容器失效的三级评定方法及应用研究

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天津科技 1999年第2期 43-43页

作者：霍立兴张玉凤

焊接接头是个不均匀体,目前国际上基于“合于使用”原则的安全评定方法,如R6等方法是以均质材料为基础发展起来的。因此在应用于焊接结构时,存在一定的局限性。该研究项目结合国内压力容器用钢,对此进行了深入细致的研究。

关键词：压力容器评定方法焊接结构焊缝强度

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The reliability analysis of welded structure with embedded cracks by using three dimensional stochastic FEM

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China Welding 1999年第2期8卷 11-17页

作者：何柏林霍立兴张玉凤杨新岐荆洪阳

In this paper, the reliability of welded structure with an embedded elliptical crack was calculated by using three dimensional stochastic finite element method. This method has overcome the shortcomings of conservative results in safety assessment with deterministic fracture mechanics method. The calculation of reliability was based on three dimensional perturbation stochastic finite element program which was developed by ourselves. The effects of variables (such as fracture toughness K IC , load P, the ratio of minor axis to major axis a/c) on the structure reliability were also discussed. The calculation results indicate that among the three variables (K IC ,P, a/c) , the fracture toughness K IC has the greatest effect on the structure reliability. The next is external load P. The ratio of the a/c has lower effect on structure reliability than both K IC and P . The method has put forward a new way for safety assessment of welded structure with embedded elliptical cracks.

关键词： welded structure embedded crack stochastic FEM reliability perturbation method

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Microstructure and fatigue crack growth behaviour of electron beam welding in 30CrMnSiNi2A steel

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China Welding 2003年第2期12卷 128-132页

作者：陈芙蓉霍立兴张玉凤张莉刘方军陈刚 College of Material Science and Engineering Tianjin University Tianjin 300072 Aviation Technique Institute of Beijing Beijing 100024

The effects of two post-weld heat treatment processes on the microstructure and fatigue properties of the electron beam welded joints of 30CrMnSiNi2A steel were studied. Electron beam local post-weld heat treatment (EBLPWHT), in a vacuum chamber, immediately after welding and a traditional furnace whole post-weld heat treatment (FWPWHT) were accepted. The experimental results show that, after EBLPWHT, the main microstructure of weld is changed from coarse acicular martensite into lath martensite, and base metal is changed from ferrite and perlite into upper bainite and residual austenite, however the microstructures of different zones of joints in FWPWHT conditions are tempered sorbite. The fatigue crack growth rate da/dN of welds and base metal are not obviously changed among EBLPWHT, FWPWHT test and as-welded (AW) test, as the mechanical properties of materials have a certain but not large effect on the da/dN of welded joints. The resistance to near threshold fatigue crack growth data of welded joints can be largely improved by EBLPWHT and it is related to microstructure and crack closure effect.

关键词： electron beam local heat treatment electron beam welding microstructure fatigue properties

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