Week 1 Stress Concentration on a Plate with hole

OBJECTIVE

In this project two metallic plate of same material are investigated for stress strain development on application of external load on it.The difference in the both plates are numbers of holes present in them.Apart from the stress and strain magnitude the point of stress concentration is also studied for failure analysis.The FEA results are compared with the  theoritical model of stress concentration developed from elasticity theory.After the analysis the selection of the plate is to be done depending on two parameters

1. Analysis point of view.

2. Manufacturing point of view.

DEFORMATION & STRESS ANALYSIS

CASE-1 : ONE HOLED PLATE

Max stress developed= 1.18 mpa 

max deformation = 0.0005 mm

 F=1000N

CASE-2 : PLATE WITH THREE HOLES

MAX STRESS= 1.171 mpa

MAX DEFORMATION = 0.0005 mm

FORCE APPLIED = 1000N 

SELECTION OF DESIGN FROM ANALYSIS POINT OF VIEW

However, it can be concluded that on applying the same external force both the plates are developing same stress magnitude and same amount of deformation.

Also, plate in second case has 3 holes, which means overall mass of the component in second case is lower than case-1.

hence, using plate with three holes can significantly reduce the overall weight of component which in turn reduces the weight of automobile.

The stresses are more evenly distributed over the entire plate surface in 3 holed plate comparatively.

SELECTION OF DESIGN FROM MANUFACTURING POINT OF VIEW

For manufacturing process 3 holed plate has two extra process to be performed more than one plate holes.This increases the manufacturing time & cost.

So as per manufacturing point of view I would go for one holed plate which is easy to manufacture.

THEORITICAL CALCULATION : as per theory of elasticity