CN107704714B - Method and system for processing finite element simulation stress value and test stress value - Google Patents
Method and system for processing finite element simulation stress value and test stress value Download PDFInfo
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- CN107704714B CN107704714B CN201711075619.9A CN201711075619A CN107704714B CN 107704714 B CN107704714 B CN 107704714B CN 201711075619 A CN201711075619 A CN 201711075619A CN 107704714 B CN107704714 B CN 107704714B
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- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Abstract
The invention discloses a method and a system for processing finite element simulation stress values and test stress values, which comprises the following steps: calculating the absolute error between the simulated stress value and the test stress value; calculating the utilization rate of the material, the relative error between the simulated stress value and the test stress value, and calculating the matching rate of the simulated stress value and the test stress value by using the relative error; and drawing by taking the utilization rate of the material as an X axis and the matching rate as a Y axis to obtain the relationship among the simulated stress value, the test stress value and the allowable stress. The invention can observe the relation among the test value, the simulation value and the allowable stress visually, and fills the blank of processing data at present; the method intuitively, accurately and reasonably expresses the relation between the test result and the simulation result, is associated with the actual application scene, is objective and is suitable for engineering application.
Description
Technical Field
The invention relates to the field of mechanical design, in particular to a method and a system for processing finite element simulation stress values and test stress values.
Background
Finite element analysis enables engineers to pre-identify potential problems prior to product manufacture or construction, shorten design and analysis cycle times, add design functionality, reduce design costs, and simulate various test scenarios, reducing test time and expense. It is therefore a very common approach in the field of mechanical design to determine design strength using finite element analysis.
In the stages of design completion and prototype manufacturing completion, necessary static strength tests are performed in order to verify the correctness of the simulation or to meet the standard. When the static strength test is finished, the test stress value and the simulation stress value error need to be compared, but the current general comparison method judges the relation between the test value and the simulation value by calculating the relative error and the absolute error between the test value and the simulation value, and the two errors can not intuitively, accurately and reasonably express the relation between the test result and the simulation result and can not be associated with the actual application scene, namely can not be associated with the allowable stress value of the material under the application scene.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a system for processing finite element simulation stress values and test stress values aiming at the defects of the prior art, and effectively and objectively evaluate the error between a simulation value (simulation stress value) and a test value (test stress value).
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a processing method of finite element simulation stress values and test stress values comprises the following steps:
1) calculating the absolute error between the simulated stress value and the test stress value;
2) calculating the utilization rate of the material, calculating the relative error between the simulated stress value and the test stress value by using the absolute error, and calculating the matching rate of the simulated stress value and the test stress value by using the relative error;
3) and drawing by taking the utilization rate of the material as an X axis and the matching rate as a Y axis to obtain the relationship among the simulated stress value, the test stress value and the allowable stress.
Correspondingly, the invention also provides a processing system of the finite element simulation stress value and the test stress value, which comprises the following steps:
the absolute error calculation module is used for calculating the absolute error between the simulation stress value and the test stress value;
the utilization rate calculating module is used for calculating the utilization rate of the material;
the matching rate calculation module is used for calculating the relative error between the simulated stress value and the test stress value by the absolute error and calculating the matching rate of the simulated stress value and the test stress value by using the relative error;
and the drawing module is used for drawing by taking the utilization rate of the material as an X axis and the matching rate as a Y axis to obtain the relationship among the simulated stress value, the test stress value and the allowable stress.
Compared with the prior art, the invention has the beneficial effects that: the method can obtain the utilization rate of the material by introducing the allowable stress of the material, obtain the matching rate through the relative error conversion between the test value and the simulation value, and visually observe the relationship among the test value, the simulation value and the allowable stress by drawing by taking the utilization rate as an X coordinate and taking the matching rate as a Y coordinate, thereby filling the blank in processing data at present; the method intuitively, accurately and reasonably expresses the relation between the test result and the simulation result, is associated with the actual application scene, is objective and is suitable for engineering application.
Drawings
FIG. 1 is a graph showing the results of the present invention.
Detailed Description
The invention specifically realizes the following steps:
firstly, obtaining a calculated value through finite element analysis or other calculation methods;
secondly, test data are obtained through tests;
thirdly, calculating the absolute error between the simulation value and the test value, and obtaining the absolute error through the calculation of a formula (1):
absolute error is an artificial value-test value (1)
Fourthly, calculating the utilization rate of the material, and obtaining the utilization rate through the calculation of a formula (2):
yield-test value/allowable stress (2)
And fifthly, calculating the relative error between the simulation value and the test value, and obtaining the error through a formula (3):
relative error ABS ((absolute error)/test value (3)
And sixthly, calculating the matching rate of the simulation value and the test value, and obtaining the result through the calculation of a formula (4):
match rate 1-relative error (4)
And sixthly, drawing by taking the material utilization rate obtained by the fourth step as an X coordinate and taking the matching rate of the simulated value and the test value obtained by the sixth step as a Y coordinate.
The material of the invention can be stainless steel, carbon steel, aluminum alloy and other materials used in static strength experiments.
Table 1 is obtained by EXCEL.
TABLE 1
| Measuring point | Test value | Simulation value | Allowable stress | Absolute error | Utilization rate | Relative | Match rate | |
| 1 | 156.14 | 174.4 | 345 | 18.26 | 0.45 | 0.116946 | 0.883054 | |
| 2 | 118.44 | 115.3 | 345 | -3.14 | 0.34 | 0.026511 | 0.973489 | |
| 3 | -176.82 | -181.2 | 345 | -4.38 | 0.51 | 0.024771 | 0.975229 | |
| 4 | 31.92 | 40.57 | 345 | 8.65 | 0.09 | 0.27099 | 0.72901 | |
| 5 | -21.84 | -30.1 | 345 | -8.26 | 0.06 | 0.378205 | 0.621795 | |
| … | … | … | … | … | … | … | … | |
| … | … | … | … | … | … | … | … | |
| … | … | … | … | … | … | … | … | |
| … | … | … | … | … | … | … | … | |
| 66 | -122.96 | -114.4 | 355 | 8.56 | 0.35 | 0.069616 | 0.930384 | |
| 67 | 300.2 | 318.9 | 355 | 18.7 | 0.85 | 0.062292 | 0.937708 | |
| 68 | 24.64 | 25.92 | 345 | 1.28 | 0.07 | 0.051948 | 0.948052 | |
| 69 | -18.13 | -24.53 | 345 | -6.4 | 0.05 | 0.353006 | 0.646994 |
As can be seen from the table above, if a large number of test points with low matching rate are found in the region with high utilization rate, the test values and the simulation values are marked to have larger errors; and finding a large number of test points with lower matching rate in the area with low utilization rate, wherein the simulation value is available because the test value is far smaller than the allowable stress.
Claims (3)
1. A processing method of finite element simulation stress values and test stress values is characterized by comprising the following steps:
1) calculating the absolute error between the simulated stress value and the test stress value;
2) calculating the utilization rate of the material, calculating the relative error between the simulated stress value and the test stress value by using the absolute error, and calculating the matching rate of the simulated stress value and the test stress value by using the relative error; the utilization rate is the allowable stress of the test stress value/material; the relative error between the simulated stress value and the test stress value is ABS (absolute error)/test stress value; the matching rate is 1-relative error;
3) and drawing by taking the utilization rate of the material as an X axis and the matching rate as a Y axis to obtain the relationship among the simulated stress value, the test stress value and the allowable stress.
2. A method for processing finite element simulated stress values and test stress values according to claim 1, characterized in that the absolute error is simulated stress value-test stress value.
3. A system for processing finite element simulated stress values and test stress values, comprising:
the absolute error calculation module is used for calculating the absolute error between the simulation stress value and the test stress value; the utilization rate calculating module is used for calculating the utilization rate of the material; the utilization rate is the allowable stress of the test stress value/material;
the matching rate calculation module is used for calculating the relative error between the simulated stress value and the test stress value by the absolute error and calculating the matching rate of the simulated stress value and the test stress value by using the relative error;
the relative error between the simulated stress value and the test stress value is ABS (absolute error)/test stress value;
the matching rate is 1-relative error;
and the drawing module is used for drawing by taking the utilization rate of the material as an X axis and the matching rate as a Y axis to obtain the relationship among the simulated stress value, the test stress value and the allowable stress.
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