We saw locational bending stresses on #3 because the tubes were welded together slightly bent (1-3 degrees, you can notice it in the photos). So when the tube was pulled axially it was also bending as it tried to straighten out.
We saw locational bending stresses on #3 because the tubes were welded together slightly bent (1-3 degrees, you can notice it in the photos). So when the tube was pulled axially it was also bending as it tried to straighten out.