A- AND B- BASIS ALLOWABLES

Generation of A- and B-basis allowable strength values are essential for reducing risk in aircraft structural components made from fiber reinforced polymer composite materials. Risk reduction is achieved by lowering the probability of failure of critical aircraft structures through the use of A- and B-basis design values. AlphaSTAR has devised a technical approach for calculating allowables with minimum testing and no loss of accuracy, while eliminating the unnecessary conservatisms that may contribute to increased weight. This effectively reduces the number of coupon testing by simulating the scatter in composite material properties and fabrication parameters.

AlphaSTAR’s technologies are able to determine allowables for laminate level un-notched coupons, while adhering to ASTM standards. Using ASC’s A-B base allowables tools (GENOA, MCQ), engineers are able to:

  • Reduce laminate level testing for the first level of FAA's building block
  • Test reduction of up to 50% as compared to current Industry practices
  • Determine A-basis from B-basis
  • Identify root cause for scatter in material strength
  • Provide guidelines for improving material behavior
  • Applicable to determination of B-basis at any level of FAA's building block (coupon, element, subcomponent, etc.)
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