Tangent Initial modulus tangent I modulus Chord modulus Secant / modulus Sirain

Question

Tangent Initial modulus tangent I modulus Chord modulus Secant / modulus Sirain Fig. 5.1 Modulus of Elasticity determination Questions and Discussion: What is the effect of variations in span length on the modulus of rupture and the modulus of elasticity of the flexure bar? 1. 2. Is the modulus of rupture a true representation of the ultimate fiber stress? Explain. 3. Is the secant modulus at the point which flexural stress of 620 kg/em difference from at the point of 1420 kg/em', Explain. Dose the strength of the flexure-test specimen represent the actual strength of the metal Explain. List the advantages of the flexure test over tension or compression tests for metals. 4. 5.

Explanation / Answer

Sol.1). Flexural modulus is usually equal to the initial tangent modulus for a flexure bar. And initial tangent modulus is termed as the modulus of elasticity. Therefore flexural modulus is equal to the modulus of elasticity.

Flexural modulus increase with the span length to a point and then it decreases.

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