Fracture Toughness Testing

World-Class Fracture Mechanics Laboratory

Westmoreland Mechanical Testing & Research (WMT&R) is globally recognised for its exceptional work in the field of Fracture Mechanics. Our state-of-the-art Fracture Laboratory is equipped to handle traditional Fracture Toughness testing, as well as specialty projects and unconventional specifications. Our capacity to manage increasing workloads and deliver results promptly establishes us as a leader in Fracture Toughness Testing.

Our Fracture Toughness Laboratory

The most frequently performed test in our Fracture Lab is the KIC Test per ASTM E399. This includes Disc Shape, Arc Tension, Single Edge Bend and Compact Tension, all of which fall under the ASTM E399 specification. Our lab can accommodate specimens of various sizes. For instance, the Compact Tension Test can be conducted on samples ranging from 6.35 mm (0.25 in) to 107.95 mm (4.25 in) thick for most applications.

The Importance of Pre-cracking

Pre-cracking is a vital part of Fracture Toughness testing. It involves creating a simulated "flaw" that aids in the testing of fractured specimens. The actual crack, which initiates at the tip of a machined notch, is typically measured automatically using compliance techniques. WMT&R also offers pre-cracking services.

Fracture Toughness tests can be performed at various load capacities and temperatures. Our servo machines can handle up to a 4,448 kN (1,000,000 lbs) load. WMT&R can also conduct tests at temperatures ranging from Liquid Helium to 1,316°C (2,400°F) in both controlled and simulated atmospheres.

K-R Curve Testing per ASTM E561

K-R Curve testing per ASTM E561 can be conducted on both compact specimens C(T) and centre crack tension panels M(T). We have the unique capability to test large M(T) panels up to 762 mm (30 in) wide. The K-R curve test provides valuable data about the toughness development as a crack is progressively propagated under an increasing applied stress intensity factor K. R-Curves and applied K-Curves are used to predict the critical stress intensity that will cause the onset of unstable fracturing.

Additional Fracture Mechanics Testing Services

We offer a range of additional Fracture Mechanics Testing Services, including: