|New Standards for Sandwich Construction Issued by Composites Committee |
ASTM Subcommittee D30.09 on Sandwich Construction is offering two standard test methods for materials used in planes, spacecraft, and other critical applications:
D 6772, Test Method on Dimensional Stability of Sandwich Core Materials, and
D 6790, Test Method for Determining Poisson's Ratio of Honeycomb Cores.
Test method D 6772 determines the change in plan dimensions of a honeycomb core after it is heated. Method D 6790 determines the Poisson's Ratio of the honeycomb core which is sometimes needed in finite element analysis programs, says structural engineer Thomas N. Bitzer, a past subcommittee chairman and chief author of Method D 6790.
When you are bonding a honeycomb sandwich panel, you do not want the core to grow or contract an excessive amount, he explains.
Before retiring in 2001, Bitzer was test lab manager in Research and Development for Hexcel Composites Company, Dublin, Calif. He brought the methodology on which D 6772 is based to ASTM, as Hexcell scientists had used the methodology for over three decades to check the stability of their honeycomb. Material scientists in ASTM Subcommittee D30.09 approved the methodology as ASTM Standard D 6772 on March 10.
Bitzer and other materials scientists developed new Standard D 6790, which the subcommittee approved on April 10.
For further technical information, contact Tom Bitzer, Hexcel, Dublin, Calif. (phone: 925/551-4900 ext 3356). Committee D30 meets Oct. 23-25 at Purdue University, West Lafayette, Ind., and March 17-20 in Kansas City, Mo. For membership or meeting details, contact Jim Olshefsky, director, Committee Services, ASTM International (phone: 610/832-9714). //
Copyright 2002, ASTM