API 5L DWTT

[bmoorthy]

This is with reference to SR 6 of API 5 L, where in reference is made to either Press Notch or Chevron Notch. API 5L also refers to RP5L3, wherein Machined Nothes are prohibitted for carrying out DWTT.

What does Chevron Notch mean?

I would like to know as to how Chevron Notches are made?

Why is Machined Notch prohibited?

 

[sayee1]

E1304-97(2002) Standard Test Method for Plane-Strain (Chevron-Notch) Fracture Toughness of Metallic Materials.

1.1 This test method covers the determination of plane-strain (chevron-notch) fracture toughnesses, Iv or IvM, of metallic materials. Fracture toughness by this method is relative to a slowly advancing steady state crack initiated at a chevron-shaped notch, and propagating in a chevron-shaped ligament (Fig. 1). Some metallic materials, when tested by this method, exhibit a sporadic crack growth in which the crack front remains nearly stationary until a critical load is reached. The crack then becomes unstable and suddenly advances at high speed to the next arrest point. For these materials, this test method covers the determination of the plane-strain fracture toughness, Ivj or IvM, relative to the crack at the points of instability.

Note 1-One difference between this test method and Test Method E399 (which measures Ic) is that Test Method E399 centers attention on the start of crack extension from a fatigue precrack. This test method makes use of either a steady state slowly propagating crack, or a crack at the initiation of a crack jump. Although both methods are based on the principles of linear elastic fracture mechanics, this difference, plus other differences in test procedure, may cause the values from this test method to be larger than Ic values in some materials. Therefore, toughness values determined by this test method cannot be used interchangeably with Ic.
1.2 This test method uses either chevron-notched rod specimens of circular cross section, or chevron-notched bar specimens of square or rectangular cross section (Figs. 1-3). The terms "short rod" and "short bar" are used commonly for these types of chevron-notched specimens.

1.3 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Got this by a google search for Chevron Notch on the net. Don't know if it is of any help?


Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
email: sayee_prasad@yahoo.com
The whole of science is nothing more than a refinement of everyday thinking!!!