What is the difference between hardness and toughness of a metal?

The ASM Metals Handbook defines hardness as “Resistance of metal to plastic deformation, usually by indentation” (asmmaterials.info).  Therefore, when a compressive force is administered to a solid matter, we can measure how resistant it is to permanently changing shape. Why is this important? A fracture mechanics engineer may consider hard material as brittle and unreliable…

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Virginia Class Submarines

Designed by Electric Boat, the Virginia-class is being built jointly under a teaming arrangement between Electric Boat and Northrop Grumman Newport News in Virginia. In 1998, the U.S. Navy awarded a $4.2 billion contract for the construction of the first four ships of the class. Virginia is the first of these. Displacing approximately 7,800 tons…

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Harley-Davidson’s New Milwaukee-Eight Engine Debuts In 2017 Touring Motorcycle Lineup

Harley-Davidson motorcycles have always been defined by their engines. Owners and loyalists know the names and nicknames for each successive powerplant version. A new engine represents the start of a new generation of Big Twin. So, when H-D revealed its 2017 Touring lineup with the new Milwaukee-Eight engine, the motorcycling public took notice. Three versions…

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