Stress Concentrations and Design Stratagies

Question 1

How do you get stress concentrations and what are stress raisers

Answer 1

Components have discontinuities such as changes in section steps keyways, notches and holes
When stress is acting near these areas it will be more there than anywhere else. These areas and discontinuities are called stress raisers

Question 2

What is K_t and K_ts and eqn

Answer 2

Geometric stress concentration factor and Geometric shear stress concentration factor
K_t=sigma_max/sigma_o

Question 3

What are the 5 main design strategies for countering stress concentration

Answer 3

G.E.K.S.H

•Shoulders: Large fillet radius, Stress relieving groove, Undercut round fillets, holes, grooves

•Holes: Additional stress relieving
holes, Stress relieving grooves

• Grooves: Additional stress relieving grooves
• End of bore close to shoulder: Stop well before the shoulder, Undercut fillet the shoulder

•Keyway runs into shoulder fillet: Move away from shoulder and round
corners added to the keyway, Undercut fillet added to the shoulder