030070162 Selin KÖK 11th week words

        Parabolic Interpolation


      There is no old definition
      New Definition

The best way to find a maximum in one dimension, when you are certain that only one maximum exists, that each successive point to the left of the maximum lessens, and that each successive point to the right of the maximum lessens is to use parabolic interpolation. When there is only one local extreme in the range you are searching, Parabolic Interpolation will work. If there is more than one local extreme, Parabolic Interpolation will not work.

( Ralph Vinc The Handbook of Portfolio Mathematics: Formulas for Optimal Allocation , p.157)

Neutral Flame

      There is no old definition

      New Definition

The neutral or normal flame is the one most frequently used in welding. It is called neutral because it neither oxidises nor carburises the parent metal.

A neutral flame requires equal volumes of oxygen and acetylene to be burnt in complete combustion.

The neutrasl flame is a clean flame: teh metal remains clean and flows easily. It is used for most welding jobs that require the metal to be melted and mixed together.

( Arnold Masterman,Robert Michael Boyce Plumbing and Mechanical Services, p.90)

        Damage anisothropy

There is no old definition
      New Definition

The Damage anisothropy is easily observed in metal specimens subjected to creep under nonproportional loading conditions. microstructural observations allowed the identification of two classes of metallic materials: copper-like, where cavitation takes place on grain boundaries essentially perpendicular to the maximum principal stres, and aluminum alloy-like, where grain boundary cavitation is much more isotropically distributed.

(Jacek Skrzypek,Artur Ganczarski, Modeling of Material Damage and Failure of Structures: Theory and Applications, p.70)

Hydrostatic Extrusion

There is no old definition

      New Definition

The variation of the hydrostatic pressure in the container with the stem displacement is usually studied in Hydrostatic Extrusion. İf it is assumed that the frictional losses in the stem/container seals are negligible, then the hydrostatic pressure p in the container is equal to the stem load Fst divided by the stem cross-sectional area Ast:

P= Fst/ Ast

(Martin Bauser,Günther Sauer,Klaus Siegert Extrusion , p.117)

Beach Marks

      There is no old definition

      New Definition

Beach Marks are produced on a fracture surface by significant changes in the applied mechanical loading such as startup/shutdown. The rate of crack devdelopment can then be found by comparing teh beach mark spacings and the turbogenerator operational records. The beach mark analysis can be used to check the accuracy of the fracture mechanics based analysis.

(, Keith John Miller,ASTM Committee E-9 on Fatigue,ASTM Committee E-24 on Fracture Testing Multiaxial Fatigue: A Symposium, 853. Sayı, p.248)