answersLogoWhite

0

Metal fatigue is caused by repeated cycling of the load. It is a progressive localized damage due to fluctuating stresses and strains on the material. Metal fatigue cracks initiate and propagate in regions where the strain is most severe.

The process of fatigue consists of three stages:

  • Initial crack initiation
  • Progressive crack growth across the part
  • Final sudden fracture of the remaining cross section
Fundamentals of Metal Fatigue

Stress life method -- plots of alternating stress, S, vs. cycles to

failure, N.

  • ignores true stress and strain (assumes elastic strains) which may be significant since initiation of fatigue cracks is plastic deformation
  • stress life methods should not be used to estimate lives below 1000 cycles

Endurance Limit: stress for which material has "infinite" life

(> 1x106 cycles)

  • existence due to interstitial elements (pin dislocations and prevent slip)
  • can disappear due to periodic overloads, corrosive environments or high temperatures
  • Most nonferrous alloys do not exhibit endurance limit (some use value at 5x108 cycles or some other number much higher than the design life)

Metal Fatigue (Definition - The phenomenon leading to fracture under repeated or fluctuating stress. Fatigue fractures are progressive beginning as minute cracks and grow under the action of fluctuating stress.)

Metal breaks down over time and extended use. (They get bent and twisted over and over). The particles in the metal move further apart and have less attraction to each other. When a crack develops it weakens the metal - metal fatigue - and can eventually fail enen if a small force is applied.

User Avatar

Wiki User

15y ago

What else can I help you with?

Related Questions

What is the ISBN of Metal Fatigue novel?

The ISBN of Metal Fatigue - novel - is 9780732256333.


How many pages does Metal Fatigue - novel - have?

Metal Fatigue - novel - has 458 pages.


When was Metal Fatigue - novel - created?

Metal Fatigue - novel - was created on 1996-05-29.


What are two types of fatigue?

If you are referring to Human Beings it can be Physical or Metal fatigue.


What has the author Paul Anthony Bartolotta written?

Paul Anthony Bartolotta has written: 'Fatigue life prediction of an intermetallic matrix composite at elevated temperatures' -- subject(s): Fatigue life, Metal fatigue, Thermal fatigue, Metal matrix composites


What has the author Bhaskar S Majumdar written?

Bhaskar S. Majumdar has written: 'Isothermal fatigue mechanisms in Ti-based metal matrix composites' -- subject(s): Debonding (Materials), Metal fatigue, Crack initiation, Metals, Metallic composites, FaiIure analaysis, Fatigue, Metal matrix composites, Fatigue life


What are the two type of fatigue?

There are different forms of fatigue. The most common ones include metabolic fatigue, muscular fatigue, energy depletion and fatigue of the nervous system.


What is zyglo test?

It is a method of measuring metal fatigue


What causes cam projection crack on the pistol browning 9mm?

Metal fatigue


Why does a axle break in a car?

Overload? Bad carrier bearing? Severe bump? Metal fatigue? (age)


What has the author F J Esper written?

F. J. Esper has written: 'Fatigue design for PM components' -- subject(s): Engineering design, Fatigue, Metal powder products, Metals


What causes broken teeth on flywheels on 1999 suburban?

Starter misaligned? Starter engaged with engine running? Metal fatigue?