892
RESISTANCE OF MATERIALS TO IMPACT.
Nov. 1908.
This machine, which has been fully described* and is well known
to engineers, is shown diagrammatically in Fig. 1, in which is
indicated the standard form of specimen and method of estimating the
energy absorbed in fracture.
The other form of single-blow impact tester adopted was that
which would produce fracture of a plain specimen by direct tension.
The machine made in the workshop for this purpose is shown in
Fie. 1. Fie. 2.
Impact Tester (Izocl). Apparatus for Static Tests.
(N. P. L. Method.)
Fig. 3. The specimen is 0-26 inch diameter, 1 inch long, and has
shanks at each end screwed with a half-inch Whitworth thread. In
testing, the specimen is screwed into the base-plate BP, and at
its other end is attached to the cross-head C. This cross-head is
connected hy two side-rods to a piston P, which is struck by the
* Proceedings 1904, Fig. 170, Plate 43 ; and “ Engineering,” 25 September,
1903.