A plate made is made up of 40 C8 (OU= 630 N/mm²), is hot rolled and normalized. It is subjected to completely reversed axial load of 50 KN. The notch sensitivity factor can be taken as 0.85 and the expected reliability is 90%. The factor of safety is 2. Determine the plate thickness for infinity life. 50 KN 50 15 50 KN

Introduction

These abrupt changes in shape under load circumstances frequently result in localized stress fields where the part generally fails. This type of localized stress is known as stress concentration, and the qualities that cause it are known as stress concentrators or stress raisers.

Given data:

$\begin{array}{rcl}\mathrm{stress}\left({\mathrm{\sigma }}_{\mathrm{u}}\right)& =& 630 \mathrm{N}/{\mathrm{mm}}^2\\ \mathrm{reversed} \mathrm{load}\left(\mathrm{P}\right)& =& 50 \mathrm{kN}\\ \mathrm{sensitivity} \mathrm{factor}\left({\mathrm{k}}_{\mathrm{b}}\right)& =& 0.85\\ \mathrm{reliability}\left(\mathrm{R}\right)& =& 90\%\\ \mathrm{factor} \mathrm{of} \mathrm{safety}\left(\mathrm{FOS}\right)& =& 2\end{array}$