Page 341 - Mechanical Engineer's Data Handbook
P. 341
GLOSSARY OF TERMS 329
work hardening See: ‘strain hardening’. wrought iron Iron containing fibres of slag (iron
workpiece A part upon which work is done in process silicate) in a ferrite matrix.
operations.
worm A part of a worm gear with helical single or yield stress (yield point) The stress at which a
multi-start thread. material exhibits a deviation from proportionality of
worm gear A high speed-ratio gear in which a single stress and strain. Steels tend to have a definite yield
or multi-start worm engages with a worm wheel with point, for ductile metals an offset of typically 0.2% is
circumferential teeth. The axes are at right angles and used.
non-intersecting. Young’s modulus See: ‘modulus of elasticity’.
