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

# Apparent normal rupture strength rupture strength is

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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
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
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
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
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.

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• Winter '17
• salman ahmed

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