INTERNATIONAL ISO STANDARD First edition Rolling bearings — Damage and failures — Terms, characteristics and causes Roulements. Failure mode ISO Subsurface initiated fatigue. Is this normal Fatigue Failure, how many of you get to see a bearing actually fail. ribo lo gy, the Science fo r Maintenance. Fatigue on Inner Race. Ref.: ISO Rolling Bearings – Damages and Failures – Terms, Characteristics and Causes.
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A crack is initiated at a stress raiser and propagates in steps over a part of the component cross- section, ultimately resulting in a forced fracture.
The features of particular interest for explaining changes and failures are described. The various forms are illustrated with photographs and the most frequent causes are indicated. Click here to sign up. Eliminate misalignment or select a bearing type suitable to accommodate the misalignment.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
BS ISO – Rolling bearings. Damage and failures. Terms, characteristics and causes
Countermeasure Apply suitable mounting tools and procedures. The explanation can include a description of the failure, probable primary cause of the failure and comments. These particles gradually increase in number as material is worn away from the running surfaces and cage.
Eroded patches, next to is flutes on Figure 21, indicated by the pencil jso, were caused by contact of the cage ribs with the inner ring.
12543 some instances, failure is due to a design compromise made in the interests of economy or from unforeseen operating conditions. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s member body in the country of the requester.
The accumulation of load cycles leads to structural changes and fatigue cracks, originating in the loaded zone. Running path pattern varying in width and in two diametrically opposed sections, displaced diagonally in relation to each other. Review means of locating bearing, e. To obtain the most reliable result, it is helpful to follow a systematic procedure when securing evidence and inspecting the bearing.
ISO FALLA EN RODAMIENTOS | Edicson Leonardo Briceño –
The isp are dark in the bottoms of the depressions see Figures 20 and Countermeasure Check load conditions and lubrication. However, it is not always easy to distinguish between causes and isoo symptoms or, in other words, between failure mechanisms and failure modes. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO shall not be held responsible for identifying any or all such patent rights.
BS ISO 15243:2017
Ensure proper handling of all machinery that incorporates rolling bearings. This produces localized stress concentrations with the potential for cracking or flaking of the contact areas.
This results in the flaking, shown as a cross contact pattern in the outer ring raceway. 1523 types of load, operating clearance and possible misalignment may be clearly revealed. Running path patterns uniform in width, positioned in the middle of the raceways and extending around the entire circumference of the raceways. Consider alternative bearing and cage.
Surface asperities oxidize and are rubbed off and vice versa; powdery rust develops iron oxide. See Figures 25 ab and cwhich depict the following types of indentation: In this case creeping of the inner ring has also occurred.
Check the application conditions regarding loading and vibration. The running path pattern is widest kso the direction of the radial loading. Countermeasure Use a bearing with higher load-carrying capacity if longer life is required. Use gloves or a barrier cream. The damage is circumferential scratches and wear of the contacting surfaces, caused by creeping of the inner ring. The initiation of the microcracks is often caused by inclusions in the bearing steel see Figure 2.
Subsequent over-rolling leading to flaking. Fracture is the result of a crack propagating to the point of complete separation of a part of the component.
Because of the minute difference in the diameters of the two components, they will have a minute difference in their circumferences and, consequently, when brought into 1523 at one point by the radial load, will rotate at minutely different speeds.
The raceway often gets a mirror finish. Countermeasure If appropriate, select a bearing with higher axial load-carrying capacity. Fatigue fracture is sometimes caused by insufficient support of the bearing ring in the housing or on the shaft see Figure