Stress Concentration Factors in the Design of Loading Forks
AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)
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As part of the design of a fatigue test rig for an aircraft bulkhead, forks using large pins and capable of carrying up to 250 kilo-pounds were required. One design was made from steel conforming to British Specification EN25 while the other was made from steel conforming to the American Iron and Steel Institutes H13 specification. Each design consisted of two equal thickness lugs which transferred the load to the aircraft bulkhead. Two different fork designs were used because while the EN25 forks were available for use in the static strain surveys they were calculated to have an inadequate life under the fatigue loading. Forks capable of carrying the fatigue loads were required and this led to the design of the H13 forks. The use of two different types of forks in this test provide the opportunity to place electric resistance strain gauges on both sets of forks to obtain experimental valves of the stress concentration factors SCFs. Keywords Mechanics Australia Test methods Stress testing.
- Test Facilities, Equipment and Methods