This standard specifies the bench fatigue life test method for agricultural tractor half shafts and drive shafts. This standard applies to agricultural wheeled tractor half shafts and drive shafts. JB/T 5181-1991 Bench fatigue life test method for agricultural wheeled tractor half shafts and drive shafts JB/T5181-1991 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T 5181-1991
Agricultural wheel tractor half shaft and drive shaft
Bench fatigue life test method
Published on May 18, 1991
Implementation by the Ministry of Machinery and Electronics Industry of the People's Republic of China on January 1, 1992
Mechanical Industry Standard of the People's Republic of China
Agricultural wheel tractor half shaft and drive shaft
Bench fatigue life test method
Subject content and scope of application
This standard specifies the bench fatigue life test method for agricultural wheel tractor half shaft and drive shaft. This standard applies to agricultural wheel tractor half shaft and drive shaft. 2 Test purpose
The fatigue life of the half shaft and the drive shaft should be verified in the following cases: a. New design or improved design;
b, change of material or process;
c. Increase of load capacity or life;
d, early damage found in use;
e. Production sampling;
f. Resuming production after transfer or long-term suspension. 3 Number of test pieces
The test pieces should be randomly selected from the qualified products of the manufacturer, and the number of test samples should not be less than 5. 4 Test specification
4.1 Test load
The test adopts pulsating cyclic loading, and the relationship between load and time is shown in the figure below: M
M. - Load mean;
The test load is determined by the following formula:
Approved by the Ministry of Machinery and Electronics Industry on May 18, 1991 M. 1. Load amplitude;
unit: Nm
M.—Minimum load value
JB/T5181-1991
Implementation on 1992-01-01
JB/T5181-1991
M.=1.2M. ..
M.in =MM
Define M as the nominal torque of the half shaft or drive shaft, which is calculated according to formula (4): W.dr+aMw
Wherein: W
Drive axle load, N;
Ground adhesion coefficient, taken as =0.65;
Drive wheel power radius, m;
Transmission ratio from half shaft to drive shaft, (for drive shaft, =1);Conversion factor of torque to torque, taken as =1.15Mw—Design bending moment of the half shaft or drive shaft. 4.2Test frequencyWww.bzxZ.net
The test frequency should be above 4Hz, and the test frequency shall not be changed during the test of the same specimen. 4.3 Specimen life
The end of the life of each specimen shall be marked by the complete breakage of the specimen or the obvious reduction of the load-bearing capacity so that the testing machine cannot work normally. 5 Implementation of the test
5.1 Test device
A vibration or crank-connecting rod torsion fatigue testing machine can be used. The test load error should not be greater than 1%, and the load should remain stable during the entire test.
5.2 Specimen installation
The clamping position of the specimen on the testing machine should ensure that the stress state and dangerous load surface of the specimen are consistent with those in use. 5.3 Test loading
Slowly increase the load from zero to the specified value, and the loading time should be between 30 and 60 seconds. 5.4 Test record
The number of cycles should be recorded at the same time when the load reaches the specified value. Observe and record the operation of the specimen every 5×10°. The number of cycles recorded at the end of the life of each specimen is the life of the specimen. Record the type and location of the final failure of each specimen. 5.4.5
When the specimen reaches 10° life without damage, it should be recorded as undamaged, and the specimen should be updated to continue the test. See Appendix A (reference) for the test record table. 6 Specimen evaluation
6.1 Data processing
6.1.1 The life of each specimen is less than 106 times
According to principle 3, the specimen life is fitted with a logarithmic normal distribution to obtain the specimen life Ngo when the survival rate is 90% (corresponding to a failure rate of 10%).
Where: X is the mean of the logarithmic fatigue life of the specimen; S is the mean square error of the logarithmic fatigue life of the specimen.
2 The life of some specimens reaches 106
JB/T5181-1991
Ngo =10 (X-1.2825)
The specimens that reach 10° life are counted as 10° times, and the specimens that are less than 10° life are counted as the actual number of times, and the data are processed according to Article 6.1.1.
6.1.3 All specimens whose life reaches 10° times
N are considered as infinite life.
6.2 Fatigue life evaluation
Ngo Each 1×10° times is equivalent to 240h of field use. Test report
The test report format is shown in Appendix B (reference). 3
Specimen name
Specimen number
JB/T 51811991
Fatigue test record
(reference part)
Number of cycles
X10 times
Fatigue test record
Operation condition
Failure form and
Failure location
Tester
Tractor
Load parameters
Drive axle bearing N
Drive wheel power radius m
Transmission ratio from half shaft to drive shaft||tt ||Heat treatment
Nominal torque Nm
Test purpose
Test equipment
Number of test pieces
Brief conclusion
Reporter
Additional notes:
JB/T5181-1991
Torsion fatigue test report
(reference)
Torsion fatigue test report
Reviewer
This standard is proposed and managed by Luoyang Tractor Research Institute. This standard is drafted by Luoyang Tractor Research Institute. The main drafter of this standard is Zheng Songlin.
Commissioning unit
Commission date
Contracting unit
Completion target
People's Republic of China
Mechanical industry standard
Agricultural wheel tractor half shaft and drive shaft
Bench fatigue life test method
JB/T51811991
Published by Mechanical Science Research Institute
Printed by Mechanical Science Research Institute
(Beijing Capital Gymnasium South No. 2, Road
Postal Code 100044)
Print Sheet 5/8
Format 880×1230
Word Count 10,000
First Edition September 1991
First Printing September 1991
Print Quantity 1-500
Price 1.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn1661_181
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