ASTM E2472-12 test method is used to determine the resistance of metal to stable crack extension by calculating crack-tip-opening angle (CTOA), ψc, and the crack opening displacement (COD), δ5. The standard values are stated in SI units.
Scope:
ASTM E2472-12 test method is used to determine CTOA and COD of fatigue pre-cracked specimens that exhibit low constraint and that are tested under slowly increasing displacement. The test specimens tested are compact, and middle-crack-tension specimens.
This test method can be used:
Test Procedure:
In ASTM E2472-12 method, tests are performed by applying slowly increasing displacements to the test specimen and measuring the forces, displacements, crack extension, and angles realized during the test. The forces, displacements, and angles are then used in conjunction with certain pre-test and post-test specimen measurements to determine the material’s resistance to stable crack extension.
Four procedures that can be used for measuring crack extension are surface visual, unloading compliance, electrical potential, and multiple specimens.
Two techniques that can be used for measuring CTOA are optical microscopy and digital image correlation.
Three techniques that can be used for measuring COD are clip gage, optical microscopy, and digital image correlation.
Specimen size:
To calculate critical CTOA and COD resistance curve, the specimens must have a minimum width of 150 mm. The fatigue crack size from the notch front should be equal to or exceed the envelope. The fatigue crack extension, ∆a, should be equal to or greater than 0.5N, but not less than 2 mm in size.
Data:
The crack-tip-opening angle (CTOA), ψc ,and the crack opening displacement (COD), δ5, resistance curve are presented.
Metrology
A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.
Metrology Testing Services POPULAR TESTS:
Materials Testing
ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.
Materials Testing Services POPULAR TESTS:Nondestructive Testing Electrical Testing Chemistry Analysis
Product Testing
Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.
Product Testing Services POPULAR TESTS:ASTM E572 test method covers the analysis of stainless and alloy steels by Wavelength Dispersive X-ray Fluorescence Spectrometry (WDXRF). It provides rapid, multi-element determinations with sufficient accuracy to assure product quality.
The ASTM D2674 is a standard test method for the analysis of sulfochromate etches solution used in the surface preparation of aluminum. The ASTM D2674 standard specifies a method for determining the efficacy of an etchant used to prepare the surface of aluminum alloys for subsequent adhesive bonding.
An immunological method for quantization of Hevea Natural Rubber (HNRL) proteins using rabbit anti-HNRL serum. Rabbits immunized with HNRL proteins react to the majority of the proteins present, and their sera have the capability to detect most if not all the proteins in HNRL.
You share material and testing requirements with us
We ensure your sample pick-up in an ensured manner
We deliver test report to your inbox
Just share your testing requirements and leave the rest on us!
