StressCheck Tutorial: Influence of Contact Zone Mismatch on Local Stresses
Abstract: Quantitative measures of the influence of meshing strategies and contact zone mismatches for a simple pin/sleeve bushing assembly. Note: in cases such as this, we observe the “knife edge” effect on the local contact stresses, in which stress “jumps” occur where contact pressure suddenly goes from non-zero to zero. These “jumps” are stress singularities associated with the mathematical model.
- Independent automeshes for pin and bushing, pin contact zone extended outside of pin/bushing overlap region.
- Matching automeshes at pin/bushing termination, pin contact zone extended outside of pin/bushing overlap region.
- Matching automeshes at pin/bushing termination, matching pin/bushing contact zone areas.
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“At DST Group, we have effectively used StressCheck® over the last 10 years to determine accurate stress intensity factors. The results have been used to improve our residual strength and structural life estimates for aircraft in service with the Royal Australian Airforce, including C-130, P-3C and F/A-18 A/B. We have found it to be extremely easy to use and a very versatile code with which to create parametric models.
We have recently used StressCheck® to obtain improved stress intensity factor solutions (Improved stress intensity factors for selected configurations in cracked plates and Improved stress intensity factors for a single corner crack at a loaded fastener hole) for five key generic configurations. These transferable parametric results have been published externally. One specific example is the non-linear contact analysis of a cracked, filled fastener hole, with both fastener and remote plate loading.”
Dr. Manfred Heller, HeadStructural & Damage Mechanics, DST Group