Failure modes, explanation

Failure Modes in Management. If the patient has not accepted the principle of drug treatment, then there is a need for renewed explanation and education to lay the groundwork for informed consent regarding a treatment plan. Those who fail to accept the principle of drug treatment usually take little or no medicine, and when they do take an occasional dose, it is often immediately prior to a scheduled visit to the doctor. Pre-visit dosing masks the clinical eye to otherwise poor compliance, but is readily identifiable with proper measurements (Feinstein, 1990). 

Experiments will be necessary to prove the existence, behavior, and engineering of a new elass of physical instability. Tensor solitary waves have been hypothesized that are related to debonding instabilities first deteeted in particulate eomposites in the early 1980 s. Figure 4 shows the eharacteristies of that simpler instability. Figure 5 eaptures a mysterious, ultrafast failure mode first observed in 2000, whose explanation may be similar to Figure 4 s partieulate (not fiber) composite results, but whose... 

Critical items List The purpose of the FMEA is to identify and evaluate failure modes and the possible system effects of those failures. Since the potential for undesirable effects must be eliminated or controlled, the FMEA also provides recommended actions that must be taken to accomplish this goal. As part of this analysis process, the FMEA identifies any and all items within the system that, if a failure were to occur, would have a critical effect on the operation of that system. Therefore, to facilitate evaluation and analysis of these system effects, a critical items list is developed. The list provides detailed descriptive information on each item. It will explain its overall function within the system, as well as the function of any components that may make up that item. The failure mode determined as critical is then listed along with the potential effect(s) of such a failure. If an item on the critical items list is to be accepted as is, then acceptance rationale must be provided. Such rationale may include an explanation of any existing or planned design limitations that will prevent the failure during actual system operations, or the provision of excessive factors of safety that will render such fail-ure(s) extremely improbable. Another area for evaluating acceptance is the history, or lack thereof, and any known failures of systems similar in nature and operation. 

In this simphfied explanation of the FHA, it should be evident that much of the data obtained during the PHA—and, if performed, the SHA and/or SSHA—can also be used to assist in the development of the FHA. The primary difference lies in the detail of the FHA method and the fact that it examines all component failure modes and assesses the impact of such failures. The potential impact on normal, safe operations may be negligible to none or devastating to catastrophic. The FHA, then, investigates the hazards of all system or subsystem faults. 

Three of the samples prepared with CHDI also failed. All three had NCO/OH equivalent ratios of 0.85, the lowest tested. Failure modes were of two types, cracking in the center of the block near the thermocouple or blow out at the edges of the blocks. All other samples were undamaged at the end of the test. For the undamaged samples, the hysteresis changes initially and then levels off as the blocks attain a steady elevated temperature. The times in the last column of Table 3 require some explanation. The undamaged samples, with one exception to be mentioned below, exhibited nearly constant temperatures during the experiment after an initial break in period. Sample 2.1-2000-0.9-0.07 exhibited the same temperature from 137 to 180 minutes, the end of the test. 

SLI battery design, materials, and operation have changed markedly in the past two decades life and failure mode distribution have also changed. In Fig. 23.22a the average age of failed batteries is plotted. Possible explanations for the shorter life in 1982 may be a... 

Eventually, faced with a goal that does not need further expansion/refinement/ explanation, add (or reference) the solution. Ideally solutions should be noun-phrases (e.g. software tests result XYZ ) (Kelly 1998), but is it often usefiil to refer to reports/assessments where the solutions can be found (e.g. an FHA need not be taken from tabular format into individual GSN arguments for each functional failure mode). 

The pull-apart mechanism that has Just been described served as a valuable working hypothesis, which, in its final form (see Fig. 4), provided a unifying explanation for all main observations as summarized in Fig. 2 above. The difference between the process depicted in Fig. 4 and the principle sketched in Fig. 3 is that the former suggests an explanation for the fault offset, by linking it to the development and eventual mode of failure of a monoclinal flexure in the shale bed. 

A BLEVE has been defined as an explosion resulting from the failure of a vessel containing a liquid at a temperature significantly above its boiling point at normal atmospheric pressure (CCPS, 1994). This section advances possible explanations for the very complex fluid stmc-ture interactions (ESI) observed in the BLEVE event and supports the hypotheses with detailed reexaminations of recent experimental data (Roberts et al., 1995a-d), and new physical interpretation and metallurgical appraisals of these same trials. The detailed reanalyses of the catastrophic failures of these four 4.5-ton water capacity LPG vessels with various fills subjected to jet fire attack indicates that the severity of the event and the intensity of the fireballs formed is not necessarily a function of the superheat of its contents but may have more to do with the initiating mode of vessel failure and the thermohydraulic state of the contents at final failure. 

The fact that the normal separation is effected by very small forces whereas the tangential separation requires appreciable forces does not disprove the adhesion hypothesis. A plausible explanation of the anomaly based upon investigations concerning the mechanics of failure has been offered. Two modes of separation have been indicated. The failure may either be superficial or... 

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