What is F.O.S for brittle materials?

Q.  For brittle materials having static load, factor of safety is given as the ratio of ______
- Published on 14 Sep 15

a. endurance strength and design stress
b. design stress and allowable stress
c. working stress and allowable stress
d. ultimate strength and design stress

ANSWER: ultimate strength and design stress
 

    Discussion

  • Sravanthi   -Posted on 29 Oct 15
    - Design stress: A machine part when subjected to maximum permissible stress is large enough to prevent failures during unfavorable conditions.

    - Ultimate strength: It is defined as the maximum stress a material can withstand when being stretched before failing or breaking.

    - Factor of safety is defined as the ratio of material strength and allowable stress. Material strength includes ultimate strength, or yield strength or endurance strength.

    - For brittle materials having static load, factor of safety is the ratio of ultimate strength and design stress.

    - For ductile materials having static load, factor of safety is the ratio of yield strength and design stress.

    - For fatigue load, factor of safety is the ratio of endurance limit and design stress.

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