scholarly journals Static fatigue of SiC-based multifilament tows at intermediate temperature: The time to failure variability

2021 ◽  
Vol 145 ◽  
pp. 106072
Author(s):  
S. Mazerat ◽  
R. Pailler
Keyword(s):  
Intermediate Temperature ◽  
Static Fatigue ◽  
Time To Failure

Static Fatigue of a 2.5D SiC/[Si-B-C] Composite at Intermediate Temperature under Air

2006 ◽  
pp. 141-146
Author(s):  
M. Moevus ◽  
Pascal Reynaud ◽  
M. R'Mili ◽  
N. Godin ◽  
Dominique Rouby ◽  
...  
Keyword(s):  
Intermediate Temperature ◽  
Static Fatigue

Aging of Silica Optical Fiber in Static Fatigue Tests

2016 ◽  
Vol 859 ◽  
pp. 3-8
Author(s):  
Noella Evano ◽  
Rochdi El Abdi ◽  
Marcel Poulain
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Fatigue Tests ◽  
Hot Water ◽  
Static Fatigue ◽  
Time To Failure ◽  
Thermal Dependence ◽  
Arrhenius Model ◽  
Bending Stresses ◽  
Silica Optical Fiber

During their use, optical fibers are subject to harsh installation and environmental conditions. To evaluate more precisely the lifetime of an optical fiber, it is necessary to study the mechanical behavior of optical fibers under extreme conditions, in particular under mechanical and thermal stress.This paper presents the results of new silica optical fibers aged in hot water between 20°C and 70°C and subjected to mechanical static bending stresses from 3 GPa to 3.5 GPa. Thermal dependence of the time to failure was observed. This dependence can be described by the Arrhenius model, where the activation energy is one of the main physical characteristic.

scholarly journals Dependence of Static Fatigue Tests on Experimental Configuration for a Crystalline Rock

2014 ◽  
Vol 891-892 ◽  
pp. 863-871 ◽  
Author(s):  
James Kear ◽  
Andrew P. Bunger
Keyword(s):  
Tensile Stress ◽  
Maximum Tensile Stress ◽  
Crystalline Rock ◽  
Fatigue Tests ◽  
Tensile Failure ◽  
Static Fatigue ◽  
Time To Failure ◽  
Exponential Relationship ◽  
Four Point Bending ◽  
Nominal Size

This paper presents static fatigue laboratory experiments conducted in three different configurations. The experiments are designed so as to cause delayed tensile failure in dry Gabbro specimens after the sustained application of a static subcritical load. Results from the static fatigue experiments give a time to failure of the specimen related to the applied static load. In the presented experiments, results spanning up to six orders of magnitude of time to failure were collected for three-point bending, four-point bending, and indirect tensile (Brazilian) specimens. The data supports an exponential relationship between tensile stress and time to failure, noting that a power law relationship is also supported by the data. The salient difference among the configurations is hypothesized to be the size of the region of the specimen that is subjected to a close approximation of the maximum tensile stress. The time to failure at a given nominal tensile stress, the decrease in time to failure associated with a given increase in stress (i.e. the slope in a semi logarithmic plot), and the magnitude of the scatter of the data about the best-fit curve are all observed to correlate inversely with the nominal size of the region subjected to the maximum tensile stress.

Static fatigue and time to failure predictions of particulate filled epoxide resin composites

1986 ◽  
Vol 21 (10) ◽  
pp. 3661-3667 ◽  
Author(s):  
H. R. Beer ◽  
T. Kaiser ◽  
A. C. Moloney ◽  
H. H. Kausch
Keyword(s):  
Static Fatigue ◽  
Time To Failure ◽  
Resin Composites ◽  
Epoxide Resin ◽  
Failure Predictions

DETERMINATION OF THE DISTRIBUTION FUNCTION OF THE TIME BETWEEN FAILURES OF A WEAPON MODEL WITHOUT TAKING INTO ACCOUNT THE ENEMY’S FIRE IMPACT

2019 ◽  
pp. 39-45
Author(s):  
M. Sliusarenko ◽  
O. Semenenko ◽  
T. Akinina ◽  
O. Zaritsky ◽  
V. Ivanov
Keyword(s):  
Distribution Function ◽  
Analytical Description ◽  
Time To Failure ◽  
Missile Defense ◽  
Incorrect Choice ◽  
Military Equipment ◽  
Time Between Failures ◽  
The Military ◽  
Fire Impact

In the article, based on the analysis of the requirements for the readiness of weapons and military equipment during combat use and the reliability of their operation in the course of combat operations, it was discovered that one of the reasons that causes a discrepancy between the declared failures and real ones may be the incorrect choice and justification of the time distribution function up to the refusal of military means. As a rule, during the development of these tools, the function of distribution of time to failure is chosen by analogy with similar patterns of weapons and military equipment. In the theory of reliability, special attention is given to choosing the function of time-breaking non-response (failures or failures). Therefore, the article deals with the questions of evaluating the effectiveness of functioning of complex systems and methods of modeling the processes of their functioning, taking into account the laws of the distribution of random variables. The discrepancy between the declared irregularity of the military apparatus and the fact that is actually observed in the troops can be explained by the incorrectly accepted hypothesis about the distribution of time to failure. Therefore, the article analyzes the order of the justification of such a function without taking into account the enemy's fire impact and the proposed variant of determining the function of distribution of the time of work until the refusal of the model of military equipment. The article also cites the reasons for the discrepancy between the claimed missile defense equipment and what is actually observed in the troops. The proposed mathematical model of faultlessness, which at stages of designing and design will allow to set requirements to the model of technology with the help of analytical description. The sequence of calculations of non-failure indexes based on the use of Weibull distribution is substantiated.

ASSESSMENT OF THE RELIABILITY OF VACUUM PRECISION PIEZOELECTRIC RESONATORS ACCORDING TO THE RESULTS OF THE ACCUMULATION AND COMPILATION OF THEIR LIFE CYCLE

2018 ◽  
pp. 65-71 ◽  
Author(s):  
I. V. Arkhipova
Keyword(s):  
Life Cycle ◽  
Reliability Theory ◽  
Time To Failure ◽  
Bayesian Theorem ◽  
Piezoelectric Resonators ◽  
Reliability Indicators ◽  
Performance Requirements ◽  
Methodical Basis ◽  
New Ideas ◽  
Generalization Of Data

Within the framework of this article the question of reliability evaluation of resonators with strict performance requirements for resistance to external factors is considered. Due to the increase in requirements for these products in terms of gamma-percentile time to failure and gamma-percentile storageability time, there is a need to develop new ideas and methods of reliability theory. As a methodical basis for generalization of data of their life cycle the approach on the basis of Bayesian theorem is offered. Based on the results of generalization of the statistics of resonator tests for various types of climatic influences and reliability tests, as well as the results of their use in the electronic equipment have been identified their main reliability indicators.

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