Work Item
ASTM WK30580
New Guide for Development of Benchmark Solutions for Composite Delamination Growth Analysis
1. Scope
The proposed guide will include several benchmark solutions (reference solutions, computed rigorously, to which other solutions will be compared) for delamination onset and growth in composite coupons that are representative of what would occur in composite structures. The proposed guide will also describe an approach, which users can follow to develop their own benchmark solutions. Once developed, these 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. Once the parameters have been identified, they may then be used with confidence to model delamination growth for more complex configurations. 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 proposed guide will focus on the application of the virtual crack closure technique.
Keywords
composite material; delamination; finite element analysis; fracture mechanics; benchmarking; virtual crack closure technique
Rationale
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.
Work Item Status
Date Initiated: 10-07-2010
Technical Contact: Ronald Krueger
Item: 000
Ballot:
Status: