Machine Design
Stress concentration is caused due to

Variation in properties of material from point to point in a member
Abrupt change of section
Pitting at points or areas at which loads on a member are applied
All of these

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Machine Design
For unequal width of butt straps, the thicknesses of butt straps are

0.75 t for both the straps on the inside and outside
0.625 t for both the straps on the inside and outside
0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside
0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside

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