Delamination is the splitting, or separating, of the individual plies of a laminated composite material, and is a common mode of failure for composite structures. Having the ability to predict delamination propagation, onset and growth in the commercial finite element codes used by industry to design and certify composite structures will enable the use of analyses to reduce the amount of sub-component testing now required in the building block approach for certification of damage tolerant composite structures. By using a combination of test and analyses rather than testing alone, designs will be developed faster and less expensively, and certified more quickly, than is currently possible. As new approaches for analyzing composite delamination are incorporated in finite element codes, the need for comparison and benchmarking becomes important since each code requires specific input parameters unique to its implementation. The benchmark solutions may be used by finite element code developers to check their implementation or by code end users to calibrate the numerical input parameters required to obtain the correct results. Also analysts new to delamination onset and growth prediction based on finite element analysis may be using the benchmark solutions as an introduction and starting point to gain first hands on experience.
The title and scope are in draft form and are under development within this ASTM Committee.