Description

The purpose of this report is to summarize the work that has been done to determine the correct design for standard lugs. From the results of this test the following conclusions were drawn: 1. The actual strength of these lugs is not at all consistent with their ratings. 2. The giving ratings do not conform to the list of 19-wire or strean-line tie rod ratings. 3. Since cable strengths are regularly 15 per cent over the ratings, the desired lug strengths should be at least 15 per cent in excess. 4. The pin size should be chosen in conjunction with the lug thickness so that the maximum bearing stress shall not be more than twice the tensile strength of the material. 5. The diameter of the head should be made sufficiently large so that the computed stress in direct tension in the section through the eye shall, at the maximum desired capacity, not exceed 80 per cent of the tensile strength of the material. Since in this test, one of the chief questions was the apparently excessive bearing stresses, part of the discussion on this point is included.