Lecture Notes

Problem Statement

Should cover function, constraint and objective

material property: material property does not depend on its size / shape (intensive property)

extensive property: property that changes as size / shape changes

Plastic deformation: non-reversible, occurs when the stress exceeds yield strength

How to Measure Yield Strength

Name	Symbol	Unit
stress	\sigma	MPa
yield strength	\sigma_y	MPa
strain	\epsilon	-
Yong's modulus	E	GPa
cross-sectional area	A	mm^2
percentage of cold work	\%CW	-

Equation	Explain
\sigma=E\epsilon
\sigma =\frac{F}{A}	F: force (N)
\epsilon=\frac{L_f-L_i}{L_i}	L: length
\%CW=\frac{t_i-t_f}{t_i}	t: thickness

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Last update: November 6, 2021
Created: September 30, 2021