Backing Materials For Stab Armor Testing
Stab and spike armor standards have been developed using 3 different backing materials. The Draft EU norm calls out Roma clay, The California DOC called out 60% ballistic gelatin and the current standard for NIJ and HOSDB calls out a multi-part foam and rubber backing material.
- Using Roma clay backing, only metallic stab solutions met the 109 joule Calif. DOC ice pick requirement
- Using 10% Gelatin backing, all fabric stab solutions were able to meet the 109 joule Calif. DOC ice pick requirement.
- Most recently the Draft ISO prEN ISO 14876 norm selected Roma as the backing for both ballistics and stab testing.
This history helps explain an important factor in Ballistics and Stab armor testing, backing stiffness affects armor penetration resistance. The energy dissipation of the armor-tissue system is Energy = Force x Displacement when testing on backings that are softer and more deformable the total impact energy is absorbed at lower force. When the force is reduced by a softer more compliant backing the armor is less likely to be penetrated. The use of harder Roma materials in the ISO draft norm makes this the most rigorous of the stab standards in use today.
Read more about this topic: Ballistic Vest
Famous quotes containing the words backing, materials, stab, armor and/or testing:
“When I moved in with a bathing suit and tea bags
the ocean rumbled like a train backing up
and at each window secrets came in
like gas.”
—Anne Sexton (1928–1974)
“He was no specialist except in the relation of things.... He took most of his materials at second hand.... But no matter who mined the gold, the image and superscription are his.”
—Woodrow Wilson (1856–1924)
“Because of the unusual remoteness of Russia, and because of nostalgia’s remaining throughout one’s life an insane companion, with whose heartrending oddities one is accustomed to put up in public, I feel no embarrassment in confessing to the sentimental stab of attachment to my first book.”
—Vladimir Nabokov (1899–1977)
“Such was the very armor he had on
When he the ambitious Norway combated.”
—William Shakespeare (1564–1616)
“Bourbon’s the only drink. You can take all that champagne stuff and pour it down the English Channel. Well, why wait 80 years before you can drink the stuff? Great vineyards, huge barrels aging forever, poor little old monks running around testing it, just so some woman in Tulsa, Oklahoma can say it tickles her nose.”
—John Michael Hayes (b.1919)