Apparent Normal Rupture Strength Rupture strength is the stress at failure It

Apparent normal rupture strength rupture strength is

This preview shows page 49 - 54 out of 81 pages.

Apparent/ Normal Rupture Strength: Rupture strength is the stress at failure. It is always less than the ultimate strength. For the brittle material the ultimate and rupture strength are almost same. Normal/ Apparent rupture strength is obtained by dividing stress by nominal area of the bar Actual Rupture Strength: Actual rupture strength is obtained by dividing stress at rupture by actual are of the bar at rupture. MODULUS OF ELASTICITY: It is the slope of stress-strain curve within the proportional limit of the material. 49
Image of page 49
MECHANICS OF SOLIDS-I 2019 Resilience: The ability of the material to absorb energy in the elastic region. Modulus Of Resilience: It is amount of work done on a unit volume of material, as simple tensile force is increased from zero to proportional limit. It is determined by calculating area under stress-strain curve from zero up to proportional limit. Toughness: The ability of the material to absorb energy in the plastic region. Modulus Of Toughness: Strain per unit volume up to rupture is called the modulus of toughness. It is determined by calculating total area under stress- strain curve, from zero to rupture point. Residual Strain: When material is loaded beyond the elastic limit then after unloading the material does not come back to its original position and there is a permanent set in the specimen. Ductile Material: Material having a relative large tensile strain up to the point of rupture or failure is called as ductile material e.g. mild steel. 50
Image of page 50
MECHANICS OF SOLIDS-I 2019 Brittle Material: Materials having a relatively small tensile strain up to the point of rupture are called as brittle materials. E.g. cast iron, concrete, etcetera. 51
Image of page 51
MECHANICS OF SOLIDS-I 2019 METHODS TO OBSERVE YIELD POINT IN A SIMPLE TENSION TEST The yield point during simple tension test can be observed by any of the following methods. Hauling of Machine: In the method the machine stop for some time showing yielding stage. It is the best method for observing yielding in ductile materials. Offset Method: For material that doesn’t have any well-defined yield point, yield strength is determined by offset method. This method consists of drawing a line parallel to stress-strain curve at 0.2% strain. Where this intersects the stress-strain curve, at that point stress ordinate is recorded as proof stress. This proof stress is taken as yield stress. SPECIFIC STRAIN METHOD: In this method, yielding will occur at specific strain and according to standard, it is 0.5% 52
Image of page 52
MECHANICS OF SOLIDS-I 2019 Luder’s Line Method: Luder is the name of the researcher who developed this method. According to him at the time of yielding, a pattern of lines appear on the polished/painted surface. These lines roughly intercept at right angle to each other and approximately 45 0 to the longitudinal axis of the bar.
Image of page 53
Image of page 54

You've reached the end of your free preview.

Want to read all 81 pages?

  • Winter '17
  • salman ahmed

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask ( soon) You can ask (will expire )
Answers in as fast as 15 minutes
A+ icon
Ask Expert Tutors