scholarly journals Research on Design and Method to Predict Fatigue Life of an Anti-Vibration Mount

2019 ◽  
Vol 8 (6S) ◽  
pp. 540-544
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Experimental Approach ◽  
Crack Nucleation ◽  
Functional Requirements ◽  
Linear Effect ◽  
Growth Mechanics ◽  
Different Types ◽  
Machine Parts ◽  
Almost All

In Industry almost all the machinery are subjected to noise, shocks and vibrations when machines are working. These vibrations leads to more frequent repairs and replacements of machine parts also reduce their life span. Antivibration mount is used as a Vibration Control Solutions for machineries. This work is more focused on the importance of anti-vibration mount, which can be used for various mechanical system. This study includes the design of mounts for various functional requirements and fatigue life prediction methods. There are several approaches to predict the fatigue life of mount. Initially, different types of failures in anti-vibration mounts are discussed in detail. Analytical method, Finite Element Method and Experimental approach to predict the fatigue life are analyzed. The strain life approach is considered, incorporate with material properties of mount and another approaches were discussed that are harmonic response, crack nucleation and crack growth mechanics. It is conclude with, the strain life approach is convenient method to predict the fatigue life of antivibration mount, because it give highly non-linear effect to find the critical region of mount

Summary of Fatigue Life Research Method on Rubber Components

2013 ◽  
Vol 834-836 ◽  
pp. 799-802
Author(s):  
Ming Qi Wang ◽  
Xiu Hua Du ◽  
Yu Jie Song ◽  
Bai Zhong Wang
Keyword(s):  
Fatigue Life ◽  
Working Conditions ◽  
Research Method ◽  
Life Prediction ◽  
Crack Nucleation ◽  
Evaluation Criteria ◽  
Fatigue Life Prediction ◽  
Design Calculation ◽  
Curve Method ◽  
Failure Evaluation

This paper summarizes the rubber component's fatigue life research methods, mainly includes the crack nucleation method, the crack propagation method and the S-N curve method, sums up the these methods from different angels of fatigue life, and various methods based on the choices are given; Based on the working conditions and fatigue failure evaluation criteria to choose the appropriate design calculation method, in order to achieve relatively accurate results of fatigue life prediction and simplify the calculation, and separately summarized FEM used in the rubber fatigue life on the application and progress in the recent stage.

Probabilistic Mesomechanics for High Cycle Fatigue Life Prediction

1999 ◽  
Vol 122 (2) ◽  
pp. 209-214 ◽  
Author(s):  
Robert G. Tryon ◽  
Thomas A. Cruse
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
High Cycle Fatigue ◽  
Crack Nucleation ◽  
Fatigue Loading ◽  
Material Behavior ◽  
Analytical Models ◽  
Cycle Fatigue ◽  
Prediction Capability ◽  
Fast Fracture

This paper presents an analytical modeling approach to characterize and understand high cycle fatigue life in gas turbine alloys. It is recognized that the design of structures subjected to fatigue cannot be based on average material behavior but that designs must consider −3σ or some other appropriate extreme value (tail of the distribution) loading and/or material properties. Thus, a life prediction capability useful in a design application must address the scatter inherent in material response to fatigue loading. Further, the life prediction capability should identify the key micromechanical variables that are critical in the tail of the materials durability distribution. The proposed method addresses the scatter in fatigue by investigating the microstructural variables responsible for the scatter and developing analytical and semi-analytical models to quantitatively relate the variables to the response. The model is general and considers the entire range of damage accumulation sequences; from crack nucleation of the initially unflawed structure to final fast fracture. [S0094-4289(00)01302-5]

Types of refractive errors and methods for their diagnosis

2020 ◽  
pp. 30-36
Author(s):  
Olga Lemzyakova
Keyword(s):  
Optical System ◽  
Contact Lenses ◽  
Vision Impairment ◽  
Refractive Errors ◽  
Vision Correction ◽  
Light Rays ◽  
Different Types ◽  
Almost All ◽  
Degrees Of Severity ◽  
The Brain

Refraction of the eye means its ability to bend (refract) light in its own optical system. In a normal state, which is called emmetropia, light rays passing through the optical system of the eye focus on the retina, from where the impulse is transmitted to the visual cortex of the brain and is analyzed there. A person sees equally well both in the distance and near in this situation. However, very often, refractive errors develop as a result of various types of influences. Myopia, or short-sightedness, occurs when the light rays are focused in front of the retina as a result of passing through the optical system of the eye. In this case, a person will clearly distinguish close objects and have difficulties in seeing distant objects. On the opposite side is development of farsightedness (hypermetropia), in which the focusing of light rays occurs behind the retina — such a person sees distant objects clearly, but outlines of closer objects are out of focus. Near vision impairment in old age is a natural process called presbyopia, it develops due to the lens thickening. Both myopia and hypermetropia can have different degrees of severity. The variant, when different refractive errors are observed in different eyes, is called anisometropia. In the same case, if different types of refraction are observed in the same eye, it is astigmatism, and most often it is a congenital pathology. Almost all of the above mentioned refractive errors require correction with spectacles or use of contact lenses. Recently, people are increasingly resorting to the methods of surgical vision correction.

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