DeMarini Youth Distance -12 Baseball Bat with a 2 1/4-Inch Barrel (17-Ounce/29-Inch) by Demarini. $39.95. ?For long lasting performance DX1 Alloy: Delivers perfect balance of high KSI strength and fracture toughness
Understanding Fracture Toughness by Thomas Hill, PhD Thomas Hill, PhD, emphasizes the importance of this metric— and how it can affect your clinical practice decisions.
DragonPlate solid Carbon/Kevlar hybrid sheets are ideal for applications where a balance between stiffness and toughness must be achieved. Although Kevlar is not as stiff as carbon fiber, it offers higher puncture and fracture toughness. Because it is a tougher material, however, these panels may be slightly more difficult to trim than our standard carbon fiber sheets.
DeMarini 2014 Uprising Little League Baseball Bat (-12). DX1 Alloy delivers perfect balance of high KSI strength and fracture toughness for long lasting performance. Hybrid performance grip is a 2-piece grip with thin performance feel and faded color look. Approved for play in Little League and all other youth baseball associations http://suliaszone.com/demarini-uprising-12-little-league-bat-30-inch18-ounce/
scratch test is assessing fracture toughness, not hardness nor strength properties. It assesses hardness and strength only when area of contact between a scratching implement & a material is so small a true indentation is made not a scratch. knowing width & depth of a scratch & horizontal force, u can determine fracture toughness of a material. "scratch test works on soft & hard materials or very small samples, enables us to isolate brittle-crack propagation & neglect plastic deformation."