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Recent content by Cevers1988

  1. Cevers1988

    Hybrid Lug - Single Shear Configuration with CFRP and Alu

    Sorry, I have sent the wrong link evidently... http://www.eng-tips.com/viewthread.cfm?qid=358428 Evo
  2. Cevers1988

    Hybrid Lug - Single Shear Configuration with CFRP and Alu

    Has anyone ever come accross this style of configuration, and could I dare to ask the considerations you made when analysing said lug? This is linked to the request sent in on http://www.eng-tips.com/viewthread.cfm?qid=314856 Cheers, Evo
  3. Cevers1988

    Lug G Factor - Coupled Effect of Out of Plane Bending and Local Bore Deformation due to Fastener

    G-pa Dave, Cheers for the NASA reference, unfortunately I didn't stipulate the structural arena; this is a fatigue study, essentially looking into the local effect of a fastener on the bore. This local deformation increases the Kt or stress raiser/intensity factor of the feature. The analysis...
  4. Cevers1988

    Lug G Factor - Coupled Effect of Out of Plane Bending and Local Bore Deformation due to Fastener

    It has been a while since my last post, so hello again! Firstly, Is anyone aware of this empirical factor? Its purpose is augment the inplane stress due to axial loading on either a single or double shear configuration? The parameters considered are: - Ratio of male to female lug thickness...
  5. Cevers1988

    Need (mid-life) Career Advice

    Whyowhy, I read that last post, it rings loud and clear with me too! I started up my own LTD to try and bypass this, hoping to find similar minded (not going to be difficult, me thinks :)) engineers who want to take control of their own careers. Working for the 'Fat Cats' does nothing but...
  6. Cevers1988

    Detrimental Effects of Re-working Previously Cold Expanded Holes (Fatigue)

    wktaylor... A very succinct reply, covering most bases apart from the actual question at hand: 'Potential destructive compounding of compression with multiple applications of CX post O/S. For one, does it exist as a practical issue (theoretically it can happen if the expansion >5.5% roughly)...
  7. Cevers1988

    Detrimental Effects of Re-working Previously Cold Expanded Holes (Fatigue)

    Yes, that is probably why it was changed - It was in response to confusion in the repair instructions being handed to the shop floor. As you said before; your standard practice is to re-cold expand at any opportunity (if taking the peak benefit at the bore into the calcs), which makes total...
  8. Cevers1988

    Detrimental Effects of Re-working Previously Cold Expanded Holes (Fatigue)

    The SRM guidelines are were justified years ago and have not been associated with any failures (so can be assumed to be an acceptable baseline). I just haven’t been able to locate the specifics of the calcs. The second addendum was issued to simplify the repair procedure for a specific repair...
  9. Cevers1988

    Detrimental Effects of Re-working Previously Cold Expanded Holes (Fatigue)

    We assume a minimum benefit at O/S levels, and incorporate that into DFM calcs. Allowing an inbuilt repairability, keeping maintainance cost down. Your suggestion would imply that there is no knockon effect of re-expanding with existing Compressive Stress in the body and bore. Any literature on...
  10. Cevers1988

    Detrimental Effects of Re-working Previously Cold Expanded Holes (Fatigue)

    rb1957... The stress field occupies a region roughly 2D from the bore centre, which varys depending on material, level of CX (4% in most cases) etc. The reaming and oversizing eats into this region as we O/S. To reiterate; I am unable to quantify the compounding effects of additional...
  11. Cevers1988

    Detrimental Effects of Re-working Previously Cold Expanded Holes (Fatigue)

    Firstly, this is my first time posting, so hello everyone! I am an F&DT Engineer working in Aerospace, so that sets the scene. Ok to the point... During a repair scenario (aerospace wing repairs), I have come accross repair manuals that depict the following: Oversizing of Cold Worked Holes...
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