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Question

What is the definition of strain? 


Solution

strain is a physical property, when material undergoes deformation within elastic limit, under static loading ,for eg in 1D strain,the factor ∆L/L is uniformly distributed along the length for each smaller length..still scrathing ur head..ok

Take a ruler 20 cm =L, apply a normal stress, such that it's new length becomes 30 cm, consider no width deformation , so if we will calculate the strain for this

For L cm length the deformation =10 cm (30–20)

So, for unit length deformation = 10/20=1/2

This is the strain for each unit length across the scale, 1/2 is a factor, which when multiplied by original length (20cm) gives the deformation value along length i.e 10cm

So it is a factor, but it remains constant for each unit length, because we assumed static loading, not dynamic loading, and within elastic limit…

According to Hooke's law ,stress is directly proportional to strain


Physics

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