AGMA B Metallurgical Specifications for Steel Gearing. standard by American Gear Manufacturers Association,. View all product details. Most Recent . 8 Aug AGMA B05 – Metallurgical Specifications for Steel Gearing/钢制齿轮冶金技术 条件. AGMA Metallurgical Specifications for Steel Gearing. AGMA Revision B05, May 3, Complete Document. Metallurgical Specifications for Steel.
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Similarly, volumetric inclusion populations can be used to populate loading models, in combination with Monte Carlo simulation, to predict relative fatigue life between different populations.
Item Detail – AGMA B05 (reaffirmed April 8, )
As such, these data alone have great utility in identifying ahma sources that can meet the cleanness requirements demanded by highly loaded, power-dense transmission systems. In order to provide a more direct linkage between gear design and steel cleanness effects on gear fatigue performance, agja further analytical processes can be performed on these automated Aga image analysis data.
Figure 7 shows the calculated mean-free paths for the globular oxide inclusions greater than 10 mm in square root area agmz stringers longer than mm in length. Proceed to Checkout Continue Shopping. Stereographic methods are employed to generate volumetric inclusion population density, and linear elastic fracture mechanics are employed to illustrate critical flaw size for initiation and growth of a fatigue crack in application. All standards are subject to revision, and parties to agreements based on this document are encouraged to investigate the possibility of 923-b005 the most recent editions of the standards shown below.
Linear elastic fracture mechanics 923-b0 a field developed in the solid mechanics and materials science communities , . Characterization of the inclusion population for a heat of steel requires tens of hours of SEM 923-bb05 time, but only tens of minutes of sample preparation and operator time.
Industry standards for steel cleanness. If that volume stressed in excess of MPa is determined to be 0. At this time, the Ultrapremium practice and agma b05 limits with steels are produced using bottom-poured ingots. Agma b05 in to leave a comment. Quantity must be a positive whole number. The consolidated tables were submitted to the gear rating committees for their agreement and are published here for reference by other standards. We have no amendments or corrections for this standard. Oxide particles in steel typically consist of aluminum, magnesium, calcium, or silicon oxide compounds or phases.
For example, an automotive ring gear might see stresses at and near the surface in the contact region in excess of MPa. The formula for calculating the volume density, N Vfor each range N V j is then:. Effort was made to reference ISO specifications where possible.
This paper has 923-h05 how statistically robust inclusion population data, gathered with SEM automated image analysis, can generate the statistically rich data needed to robustly consider design concerns.
Inclusions can be placed parametrically by the user to study various scenarios. Early in the running of this gear, the bending stresses, combined with the inclusion, were large enough to result in a stress intensity that exceeded the threshold, Kth, hence allowing a fatigue crack to initiate at the inclusion.
However, this method does not provide inclusion metrics that are relevant to gear design, and it cannot provide the statistically robust data needed to predict gear performance.
The inset pictures from the gear failure illustrate how this LEFM data relates to the gear failure.
AGMA B05 – Metallurgical Specifications for Steel Gearing
In the laboratory, one can apply known cyclic stress intensity to a crack and evaluate the threshold stress intensity, K thor the minimum stress intensity required to begin to drive crack growth. Your Alert Profile lists the documents that will be monitored.
The operator loads a carousel of 12 samples into the SEM and starts the automated analysis process. The fatigue performance axis in these figures is based on the average maximum stress observed in each of the Monte Carlo sets. When the stress intensity reached the critical value, K 1Cthe tooth 923-b5 off completely.
The balance of the document remains unchanged. Table 2 shows the maximum likely globular oxide inclusions for each of the steels reviewed previously. This method of steel cleanness rating has been used for decades in order to assure the level of steel cleanness is achieved per a specified limit. Topics related to gear design and rating, such as case depth, stress numbers, and quality control sampling plans are not included in this document. The statistics of extreme values SEV can be used to predict the single largest inclusion likely in the steel, enabling the gear design engineer to consider the worst-case inclusion.
Gear Design Relevant Cleanness Metrics
The reduced variate is a log-log measure of the accumulated inspected area over the set of extreme value samples. Quantitative stereology ,  can be used to ayma the mean-free path between inclusions or the volumetric concentration of inclusions based on the measured unit area data. Murakami and co-workers sgma used stress analysis to evaluate a broad range 923-0b5 defect shapes and sizes, under a range of loading conditions. From this work, they determined that the stress intensity was related to the square root area of the defect in the plane normal to the principal stress, and they developed a 293-b05 intensity equation as a function of the square root area of an inclusion as follows:.
Ag,a paper has agma b05 how statistically robust inclusion population data, gathered with SEM automated image analysis, can generate the statistically rich data needed to robustly consider design concerns.
The SEM scans each mm 2 sample and stops on any particle larger than 3 mm in square root area. A sample is machined with a notch and subject to an initial fatigue cycle to pre-crack the sample. The reduced variate is calculated as follows:.
This standard is not included in any packages. The next two are from domestic special bar quality SBQ steel mills. This agma b05 of the information sheet, AGMA B05, incorporates changes to item 8, microstructure, of table 1, Agm characteristics sgma through hardened gearing. All standards are subject to revision, and parties to agreements based on this document are encouraged to investigate the possibility of applying the agmw recent editions of the standards shown below.
Note that cleaner steels will have a larger mean-free path between globular inclusions and stringers. Characteristics covered include raw material, heat treatment and post heat treat processing, and their associated inspections.
A wide range of other geometric measures can be agja as needed. For D type globular oxides, agma b05 worst 0. Similarly, volumetric inclusion populations can be used to populate loading models, in combination with Monte Carlo simulation, to predict relative fatigue life between different populations. If it is determined that inclusions greater than 10 mm represent a risk for failure at stress levels exceeding MPa, then the gear agma b05 engineer can assess the design and determine what volume of gear is exposed to principal stresses of MPa and higher.
This is a good assumption with micro globular oxide inclusions but clearly does not work for macro stringer oxide inclusions.