the wire flow faster or at a higher velocity than those in its center. This flow velocity variation causes a lesser amount of elongation at the center of the wire than at the surface of the wire. A stress differential resulting from this mechanism of elongation induces compressive, longitudinal stresses on the surface of the wire and tensile, longitudinal stresses at its center. Voids, known as central bursts, can occur in the center of the wire when the tensile stresses exceed the breaking strength of the material. The central burst effect can be prevented by controlling the process geometries.
Strain introduced into the wire by the drawing process increases the tensile strength of the wire. Preferably, this increase is held constant at every die of the draft in aA Suffolk County grand jury has indicted a subsidiary of a global security company and one of its special police officers after prosecutors alleged the guard grabbed, choked, threw, and punched an 11-year-old girl who shoplifted from a Boston clothing store in June.

Mohammad Khan, 36, of Cambridge, and his employer, New Jersey-based Securitas Security Services USA Inc., were both indicted Tuesday, Suffolk County District Attorney Rachael Rollins’s office said in a statement Wednesday.

Officials said Khan used “excessive and unreasonable force” to detain the young shoplifter, who admitted to authorities that she took several clothing items totaling an estimated value of $175 from the Primark store in Downtown Crossing, on June 9.


Khan, a special police officer, grabbed the girl (who was not identified), pulled her into the store, and