摘要
介绍了隔离开关壳体铸件在水压试验过程中应力(应变)电测法试验。结果表明,在标准试验压力下壳体各个测点应力(应变)-水压线性相关,壳体完全处于弹性变形且残余应变很小,未产生屈服。试验得出应力较大的3点均处于壳体相贯线部位,与理论设计分析相符。强度评定结果表明,壳体铸造工艺合理,强度完全满足安全设计要求。最后对壳体应力与破坏后断口组织结构分析可知,断口为脆性断裂和塑性断裂的混合断裂模式,随应力增大,金相组织中微小缩松仍是诱发断裂源。
It has made a detail description about the strain and stress distribution of the cast shell in hy- drostatic pressure, which was tested by electric measurement. The results indicate that all pressure- stress relationships exhibits linear correlation under the standard pressure, so the casting shell is in elas- tic deformation and in trace residual strain with absence of yield deformation. Tested results show that the three points with the bigger stress are located at the intersecting line of the shell, and the overall stress distribution of the shell is consistent with the theoretical analysis. The strength evaluation shows that the shell casting technology is reasonable and the shell strength meets completely the demands of safety design. Finally, the analyzed results of shell stress and the fracture structure reveal that the frac- ture mechanism is characterized by mixing of brittle fracture and plastic fracture, and the micro-porosity in metallurgical structure is still the resource of the fracture with the increase of the stress.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2017年第7期777-780,共4页
Special Casting & Nonferrous Alloys
基金
国家电网平高集团研究开发项目(PGKJ2016019)
关键词
铸造壳体
应力应变
金相组织
断口形貌
Cast Shell, Strain and Stress, Metallurgical Structure, Crack Morphology
