Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Define Fatigue - Materials
The normative view of the stress/strain is found in the example of the paper clip wire experiment. Take a paper clip wire and try to break it by pulling on it by hand. You are unable to break it because you need to exceed the ultimate stress of the material. Bend a paper clip between your fingers and the following is observed: when the wire rebounds to its original shape the proportional/elastic limit is observed; bend it farther to a point where the wire is permanently deformed, the yield point is observed; and, when the wire is bent one way then the other a few times, the wire breaks easily. The phenomenon is known as fatigue.
All materials have microcracks. The cracks are not critical and are averaged as ultimate strength for the bulk material in a tension test. However, when the material is subjected to cyclic loading, the microcracks can grow until some of the cracks reach critical length, at which time the material breaks. The stress value at cyclic loading is significantly lower than ultimate stress of the material. Failure due to cyclic loading at stress levels significantly lower than the static ultimate stress is called fatigue. All engineered systems account for fatigue failure. At low levels of stress the failure may occur at millions or billions of cycles. Endurance tests determine the cyclic loadings and fatigue strength.
Sometimes side of concrete bridges is observed to turn black in colour . What is the main reason being for the phenomenon ?
Estimate the single room of size 3m x 4m x height 3m using individual wall method?
Charged of stores - The following types of stores come under this category: - i. Consumable stores, such as kerosene oil, paints, varnishes, cotton waste and grease, etc, is
Explain Measured shovel Packing Measured shovel Packing essentially consists of accurate measurements of track defects particularly the unevenness and voids caused in the cour
Shear lag in typical box-girder bridge For multiple-cell box girders, there are normally two arrangements. First one is that independent cells are connected by their top flang
processes of chemical prestressing
The discharge of water collected from a constant head permeameter in a period of 15 minutes is 500 ml. The internal diameter of the permeameter is 5 cm and the measured difference
Question In checking quality of weld, what are pros and cons of a variety of non-destructive weld inspection methods as in ultrasonic test, radiographic inspection and magnetic
Q. What is Venturimeter? The Venturimeter is an apparatus for finding out the discharge of a liquid flowing in a pipe . A Venturimeter in its simplest from consist of the follo
different types of ashlar masonry
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd