Failure Mechanisms Cumulative Model for Reliability Evaluation of k-Out-of-n System with Different Types of Failure Mechanisms

2018 ◽  
Author(s):  
Xiaoyong Yu ◽  
Ying Chen
Keyword(s):  
Failure Mechanisms ◽  
Reliability Evaluation ◽  
Different Types ◽  
Cumulative Model

scholarly journals Determination of Cohesion values of Rock Materials using Double Shear Jaws

2018 ◽  
Author(s):  
Eren Komurlu ◽  
Aysegul Durmus Demir
Keyword(s):  
Failure Mechanisms ◽  
Shear Stresses ◽  
Compressive Test ◽  
Contact Conditions ◽  
Testing Conditions ◽  
Rock Materials ◽  
Double Shear ◽  
Different Types ◽  
Shear Planes

In this study, experimental and numerical analyses were carried out for determination of cohesion values of different types of rock materials using double shear jaws (DSJ) which can be practically used with the conventional compressive test equipment, to make shear planes in the rock core specimens. Effects of various parameters like jaw dimensions, gaps between triple blocks of the DSJ and contact conditions of the jaw on the results and validity of the cohesion test were investigated considering failure mechanisms of rock core specimens. Instead of a failure induced due to the shear stresses, tensile failures are mostly seen from conventional shear testing conditions. For a valid failure under the control of shear stresses, a DSJ design was suggested to be used in cohesion determination tests according to the results obtained from this study.

Delamination from edge flaws

1994 ◽  
Vol 447 (1930) ◽  
pp. 271-279 ◽  
Keyword(s):  
Thin Films ◽  
Stress State ◽  
Failure Mechanism ◽  
Crack Front ◽  
Failure Mechanisms ◽  
Different Types ◽  
Laminated Material ◽  
Localized Failure

The mechanics of delamination from an edge flaw in a laminated material is presented. Two different types of failure mechanism have been identified: uniform delamination along the crack front and localized delamination which can be initiated if the laminate buckles above the debonded portion of the interface. Depending on the stress state within the bonded portion of the laminate, this localized failure can initiate the formation of blisters which grow by a mechanism of buckling-driven delamination and can cause general failure of the laminate. There are conditions under which this class of buckling-assisted delamination occurs at loads lower than would be predicted for uniform delamination. It may, therefore, have important implications in the design against failure for thin films, composites and other laminated systems. Experimental observations of the different failure mechanisms are presented and the factors governing the transitions between them are discussed.

A Bayesian reliability evaluation method with different types of data from multiple sources

2017 ◽  
Vol 167 ◽  
pp. 128-135 ◽  
Author(s):  
Lizhi Wang ◽  
Rong Pan ◽  
Xiaohong Wang ◽  
Wenhui Fan ◽  
Jinquan Xuan
Keyword(s):  
Evaluation Method ◽  
Reliability Evaluation ◽  
Multiple Sources ◽  
Different Types

High Temperature Sliding Wear of Thermal Sprayed Coatings

2015 ◽  
pp. 163-192 ◽  
Author(s):  
A. Pauschitz ◽  
Manish Roy
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Elevated Temperature ◽  
Sliding Wear ◽  
Failure Mechanisms ◽  
Composite Layer ◽  
Chemical Compositions ◽  
Different Types ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

In this chapter, various layers that are formed during sliding wear of thermal sprayed coatings at elevated temperature are discussed. Glazed layers are formed on the worn surfaces during elevated temperature sliding wear of thermal sprayed coatings. These layers have a characteristic physical appearance, mechanical properties, chemical compositions, and failure mechanisms. Wearing conditions, wearing material, and mating material influence formation and characteristics of glazed layers. Among these parameters, wearing material and mating material are most important. These glazed layers are divided into different types of layers, namely Transfer Layer (TL), Mechanically Mixed Layer (MML), Reaction Layer (RL), and Composite Layer (CL). The recent results on friction of thermal sprayed coatings at elevated temperature are rationalised in the light of different types of glazed layer formation.

Experimental Study of Tool Wear in Milling Multidirectional CFRP Laminates

2013 ◽  
Vol 770 ◽  
pp. 276-280 ◽  
Author(s):  
Sheng Chao Han ◽  
Yan Chen ◽  
Jiu Hua Xu ◽  
Jing Wen Zhou
Keyword(s):  
Tool Wear ◽  
Failure Mechanisms ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Tool Geometry ◽  
Cfrp Laminates ◽  
Coated Tools ◽  
Reinforced Polymer ◽  
Different Types ◽  
End Mills

This study aims to investigate the wear of coated end mills when milling Carbon fiber reinforced polymer (CFRP) composites. Four different types of end mills are used in the milling experiments to identify the influence of tool geometry and material on tool wear. Cutting forces and wear mechanisms of coated mills are also discussed. Through the contrast experiment, diamond coated multitooth router shows the best performance with the smallest cutting force and the least wear extent under the same cutting parameter. The major failure mechanisms of coated tools are breakthrough of coating, coating flaking and abrasive wear of substrate.

Reliability Analysis of DKNCP Systems with a Mixture of Degrading Components Subjected to Different Types of Shocks

2018 ◽  
Vol 25 (04) ◽  
pp. 1850019
Author(s):  
Somayeh Hamed Ranjkesh ◽  
Ali Zeinal Hamadani
Keyword(s):  
Reliability Analysis ◽  
High Performance ◽  
Failure Mechanisms ◽  
System Operation ◽  
Component Failure ◽  
Different Types ◽  
Natural Degradation ◽  
Random Shocks ◽  
Specific Number ◽  
Random Amount

This paper attempts to model the reliability of dynamic k-out-of-n systems with component partnership (DKNCP) in which a mixture of deteriorating components and multiple types of shocks are inflicted on the system. Previous studies were merely focused on the DKNCP systems affected by one type of shock that influenced all its components. In practice, however, shocks do not necessarily affect all the components. Hence, shocks may be classified based on their magnitude, specifications, and the components they affect. In this paper, random shocks are classified into distinct sets based on the components affected. DKNCP or adaptive KNCP is a new redundancy system that can be applied when a specific number of high-performance components is required which cannot be replaced by lower-performance components even if the number of these components is high. In a DKNCP system, the components contribute to the system operation in different ways and can make partnership groups for the system to survive when a component failure occurs. Also, we consider two failure mechanisms: accumulating degradation and random shocks. Two types of random shocks are also considered in the model: critical shocks, that cause instantaneous component failure, and non-critical ones, that increase natural degradation by a random amount.

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