Method for determining fatigue limit of turbine engine blade with stress concentration
An engine blade, fatigue limit technology, used in the application of repetitive force/pulse force to test the strength of materials, the use of stable tension/pressure to test the strength of materials, measurement devices, etc. Differences and other issues, to achieve the effect of comprehensive application of blades and high calculation accuracy
Active Publication Date: 2019-12-20
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
View PDF11 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The purpose of the present invention is to provide a method for determining the fatigue limit of turbine engine blades with stress concentration, so as to solve the problem that the blades in the prior art often have stress concentration, and the method for determining the fatigue limit of the blade is complicated, and the fatigue limit determined is also complicated. There is a big difference in the problem
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0041] The present invention will be further explained below in conjunction with the accompanying drawings.
[0042] A method for determining the fatigue limit of turbine engine blades with stress concentration of the present invention comprises: normal temperature quasi-static tensile test of standard smooth test piece of material for blade, high temperature quasi-static tensile test of standard smooth test piece of material for blade, Material standard smooth test piece normal temperature high cycle fatigue experiment, blade material standard smooth test piece high temperature high cycle fatigue experiment, blade material notch test piece normal temperature high cycle fatigue experiment, blade material notch test piece high temperature high cycle fatigue experiment, actual blade High cycle fatigue experiment, actual blade fatigue limit determination. The test equipment used includes electro-hydraulic servo fatigue testing machine, electro-hydraulic servo tension-torsion fati...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for determining the fatigue limit of a turbine engine blade with stress concentration. The method comprises the following steps of respectively performing a normal temperature quasi-static tensile experiment of a standard smooth test piece for a blade material, a high-temperature quasi-static tensile experiment of a standard smooth test piece for the blade materialto obtain basic material properties; respectively performing a normal-temperature and high-cycle fatigue experiment of the standard smooth test piece for the blade material, a high-temperature and high-cycle fatigue experiment of the standard smooth test piece for the blade material, a high-temperature and high-cycle fatigue experiment of a notched test piece for the blade material and a high-temperature and high-cycle fatigue experiment of the notched test piece for the blade material to obtain an equilife curve of the blade material; performing an actual blade high-cycle fatigue experimentto determine the blade fatigue limit at normal temperature; in consideration of the influence of stress concentration effects and temperature on blade fatigue limits in service, determining the actualblade fatigue limit. The design experiment in the method is simple and the cost is low; the determined fatigue limit result is accurate, and the accuracy degree of the result is improved.
Description
technical field [0001] The invention belongs to the technical field of turbomachinery, in particular to a method for determining the fatigue limit of turbine engine blades with stress concentration. Background technique [0002] Steam turbines are mainly used in power plants and ship power systems. They have the characteristics of long service periods and long continuous working hours during service. In order to ensure that they meet the safety and reliability requirements during service, corresponding high-cycle fatigue is required for the blades. Test, and by comparing with the high cycle fatigue test results of material standard samples, reverse the life of the blades in the actual use process, and provide a basis for the development and finalization of steam turbines. However, the blades often have stress concentration, and the method of determining the fatigue limit of the blade is complicated, and the determined fatigue limit also has great differences. Contents of t...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): G01N3/10G01N3/18G01N3/38
CPCG01N3/10G01N3/18G01N3/38G01N2203/0003G01N2203/0005G01N2203/0017G01N2203/0048G01N2203/005G01N2203/0073G01N2203/0075G01N2203/0226
Inventor 牛序铭孙志刚赵旭宋迎东
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS