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For standardized testing of fracture toughness by the Charpy impact method, specimen and notch dimensions are most often taken from American standard ASTM E23, or British standard BS EN ISO 148-1:2009. For all notch types, a key parameter in governing stress concentration and failure in notched materials is the notch tip curvature or radius. [1]
Bricklayer's trowel has an elongated triangular-shaped flat metal blade, used by masons for leveling, spreading, and shaping cement, plaster, and mortar. Pointing trowel, a scaled-down version of a bricklayer's trowel, for small jobs and repair work. Tuck pointing trowel is long and thin, designed for packing mortar between bricks.
Schematic and dimensions of a compact tension specimen. A compact tension specimen ( CT ) is a type of standard notched specimen in accordance with ASTM [ 1 ] and ISO [ 2 ] standards. Compact tension specimens are used extensively in the area of fracture mechanics and corrosion testing, in order to establish fracture toughness and fatigue crack ...
The notch in the sample affects the results of the impact test, [6] thus it is necessary for the notch to be of regular dimensions and geometry. The size of the sample can also affect results, since the dimensions determine whether or not the material is in plane strain. This difference can greatly affect the conclusions made. [7]
A machinist square or engineer's square is the metalworkers' equivalent of a try square. It consists of a steel blade inserted and either welded or pinned into a heavier body at an angle of 90°. Usually a small notch is present at the inside corner of the square.
A 1912 advertisement for a Marshalltown Trowel. The Marshalltown trowel is an excavation implement used by archaeologists around the globe. Manufactured by the Marshalltown Company of Marshalltown, Iowa, the trowel was first introduced in the 1890s. [1] A patent filed for its handle by the company on July 12, 1927 was granted on December 23 ...
They come in several shapes and sizes depending on the task. The following is a list of the more common masonry trowels: Brick trowel: or mason's trowel is a point-nosed trowel for spreading mortar on bricks or concrete blocks with a technique called "buttering". The shape of the blade allows for very precise control of mortar placement.
A Robertson screw, also known as a square screw [1] or Scrulox, [2] is a type of screw with a square-shaped socket in the screw head and a corresponding square protrusion on the tool. Both the tool and socket have a slight taper .