midsidenode
Mining
I've been asked to help disposition some aircraft stucture that has some minor corrosion directly adjacent to some primary load carrying fasteners. The material that has the corrosion is aluminum 6061-T6 and the fastener holes are countersunk. I've read that corrosion adjacent to the edges of holes can sometimes create stress concentrations on the order of 3 to 4 which alarms me. The corroded section cannot be replaced without performing some very invasive work so the question has been asked whether it can be adequatley repaired. I am not a corrosion expert by any means but i need to evaluate this area with regards to strength. Can anyone offer some practical advice or point me in the right direction w/r to allowable corrosion or evaluating corrosion in these types of areas?