Other Failure Modes

Evidence of metallic particles clinging to the rubber surface can be an indication of a 

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Surface defects, if sufficiently severe, may result in failure by themselves. More commonly, they act as triggering mechanisms for other failure modes. For example, open laps or seams may lead to crevice corrosion or to concentration sites for ions that may induce stress-corrosion cracking. 

Common confusions Vibration analysts often confuse resonance with other failure modes. Since many of the common failure modes tend to create abnormally high vibration levels that appear to be related to a speed change, analysts tend to miss the root cause of these problems. 

Several other failure modes can and do occur with VRLA batteries in both float and cyclic applications, as follows. 

The MSG-3 process thus requires quantitative data on inspection reliability to function correctly. In addition, no rule-based prediction system can foresee all possible malfunctions, so that once an aircraft is in service, regirlar detailed inspections are made of the whole structure to discover any unexpected cracks. When such new cracks are foimd, the information is typically shared among manufacturers, operators, and regirlators in the form of supplementary inspections. Similar considerations apply to other failure modes, such as corrosion. 

Of these failure mechanisms, the major ones associated with delamination include contaminated surfaces, inadequate adhesive coverage, stresses, voids, and moisture absorption. Many of these mechanisms are also responsible for other failure modes besides delamination. 

Schematic sketches of other failure modes in the aligned fibre composite (a) tension parallel to axis 2 and (b) shear parallel to axis 1. 

A failure mode is called mdependent if other failure modes cannot have any effects on its damage factor. An ADT on a product including N independent failure modes rmder M stressors must individually be carried out for every stressor. It is assumed that every combination of stressors in service levels is not able to activate the failure mechanism of a new failure mode than the ones have already been detected under the individual stressors, otherwise the combination of the stressors must be considered as a new stressor, and the new failure mode has to be included in the product. 

Note that both regions and layers can also be considered as graphical entities. They thus have to be analysed in accordance with all the other failure modes. 

In the workshop some components are identified as obsolete. When certain failure modes occur, which require component replacement, the only possibihty is to buy a new component and redesign parts of the system to make it fit. This redesign may take several months. Other failure modes can be fixed without any replacements and will lead to much shorter downtimes. Based on expert judgment, a probability of such a failure mode occurring is assigned to such components in the model. Other components have no spare parts. In the model, given a failure, with a certain probability the failure mode is such that spare parts are required and the ordering time leads to an extensive downtime. 

As in the specimen A ultimate strength testing, almost all of the room temperature and most of the cryogenic temperature fatigue failures result in a uniform mushrooming of the specimen near one end. The other failure mode is an approximately 45 fracture line through the middle of the specimen. This is indicative of compressive failure in shear. There is no systematic difference in fatigue life between these two failure modes. 

Radiation damage failure occurs when the changes in material properties induced by exposure to a nuclear radiation field are of such a type and magnitude that tlie part is no longer able to perform its intended function, usually as a result of the triggering of some other failure mode, and often related to loss in ductility associated with radiation exposure. 

The very broad term environment failure implies that a part is incapable of performing its intended function because of the undesired deterioration of the material as a result of chemical or electrochemical interaction with the environment. It often interacts with other failure modes such as wear or fatigue. 

The failure mode in question or some other failure mode. 

Ifthe thickness of the coating exceeds this particular value, the coating fractures during the deposition or the thermal treatment, due to an excess of tensile intrinsic or thermal stresses. Several other failure modes may be present, such as surface cracks, chanelling, spalling, debonding, etc. which of these actually occurs depends on the relative fracture... 

Consequently, even if one failure mode such as implant fracture is perfectly controlled so that the corresponding reliability is unity, other failure modes such as infection could severely Hmit the utiKty represented by the total reliability of the implant. One mode of failure which can occur in a biomaterial, but not in... 

The Petri-Net degradation model developed in this work is a comprehensive model of the interactions between the previously identified failure modes in a PEMFC of standard construction. The standard construction is such that there is a PTFE based membrane, Carbon/Pt catalyst, steel BIP and carbon GDL. The individual degradation modules range from relatively simple relationships with 2 3 places and a low number of transitions, to larger modules with 8 places and 8 transitions. It contains 21 separate modules that interact to both dehver a voltage degradation value, and further interact with other failure modes. 

As reportedly slope instability is the highest cause for TDs failures, this paper focusses on that particular failure mode. The proposed methodology could, however, easily be expanded to cover other failure modes (Table 37.1). 

Materials and battery assemblies may be characterized and optimized for performance and safety by various means and techniques. The techniques evaluate the stability of materials, electrode formulations, cell construction, and battery assemblies for responses to a variety of off-normal conditions that simulate abusive events such as mechanical, electrical, and thermal abuse. Additionally, battery packs have other failure modes such as inter-ceU shorting and cell imbalance that can cause overcharge and overdischarge. 

Similar fuzzy sets could be generated for describing the safety of other failure modes, which could be aggregated using conventional fuzzy operations to generate safety descriptions for the components, the subsystems and the whole system of the assessment hierarchy. However, this process may lead to information loss. 

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