Question

youngs modulus if stress is tensile

Answer 1

Young’s modulus is the elongation of a material under unit stress, when the deformation is elastic (i.e. it returns to the original state when the stress is removed).

Tensile strength is the maximum stress the material withstands before it breaks under tension.

Many materials deform elastically for smaller stresses, then non-elastically before they break at their tensile strength. Here is the stress-strain chart for aluminum which shows elongation on the x-axis in response to stress charted on the y-axis. You can see that initially the relationship is linear. The slope [1]of this part of the curve is the Young’s modulus. It then deforms much faster to its tensile strength, shown as 1, then continues to elongate, losing some resistance, until it breaks.