Bypass stress 1

[JJ22mW]

I've seen the term "bypass stress" used in threads regarding stresses around holes. What is bypass stress?

 

[SWComposites]

The term is typically used in bolted joint analysis; its the stress that goes around (bypasses) a hole. In metal structure analysis it is more or less equivalent to net area stress.

 

[der8110]

total (input)stress - load carried by fastener = bypass stress

load carried by fastener being dependend on number, diamter, material, and the materials being joined.

 

[prost]

der8110: wrong units!
(input stress)*width*thickness - (fastener load)=
(bypass stress)*width*thickness

or

(input stress)-(fastener load)/(width*thickness)=(bypass stress)

 

[rb1957]

picture an open hole ... all the stress is "by-passing" the hole.

put a fastener in the hole ... the fastener reacts some of the applied stress, so there is a fraction of the applied stress "by-passing" the hole and the remainder is reacted as pinload.

draw a free body of the plate with the hole in it ... on one side you the total applied stress, on the other the "by-passing" stress and in the middle (at the hole) you have the balancing pinload.

 

[JJ22mW]

I understand the term now, thanks guys.