// fracture mechanics and fatigue tests
FRACTURE MECHANICS TESTS
Fracture mechanics test analyzes the behavior of materials in the presence of defects. This testing is critical to preventing catastrophic failures in critical structures and components. We offer detailed analyses to understand the fracture toughness of materials and improve their reliability.
The SMT Materials Testing Laboratory conducts fracture mechanics tests with load capacities up to 250 kN on both SE(B) and (C(T) geometry specimens.
All tests are conducted at controlled temperature from -100 °C to +100 °C; for crack propagation rate (dA/dN) tests, the test temperature can vary from -140 °C to +200 °C.
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// accredited test accredia lab
accredited tests
SMT, an ACCREDIA Testing N°00588 accredited materials testing laboratory, has accredited fracture mechanics testing according to the following international standards:
C.T.O.D. 6 kN to 300 kN, -80 to +75°C
ASTM E1820, ISO 12135, UNI EN ISO 15653 for welded materials, BS 7448-1
KIC 6 kN to 300 kN, -80 to +75°C
ASTM E399, ISO 12135, UNI EN ISO 15653 for welded materials, BS 7448-1
JIC 6 kN to 300 kN, -80 to +75°C
ASTM E1820, ISO 12135, UNI EN ISO 15653 for welded materials
Crack propagation rate (dA/dN) 0.4 kN to 250 kN, -80 to +75°C
ISO 12108, ASTM E647
METHODS IN DETAIL
C.T.O.D. test.
In the elasto-plastic field, the C.T.O.D. (Crack Tip Open Displacement) test is intended to calculate the radius of the crack apex before the crack, mechanically generated within the specimen, propagates due to the stress state.
KIC trial
In the linear elastic field, the test for determining fracture toughness in the plane strain state aims to calculate that value of stress intensification factor “K” reached at which a crack present in the material propagates unsteadily, generating a crash fracture.
Trial JIC
The J integral, in the elasto-plastic field, represents the energy release due to crack propagation. This energy approach of fracture mechanics is a tool to uniquely characterize the behavior of a ductile material in the presence of defects and thus allows a criterion of stability to propagation to be defined.
Test for determination of crack propagation speed (dA/dN)
The crack propagation rate determination test is the tool for being able to calculate the rate at which a crack advances, understood as a linear length per cycle, at a fixed stress state (ΔK).
The result of the test, conducted in accordance with ASTM E647, is to determine the threshold stress state (ΔKth), below which the crack advance rate can be negligible, and the coefficients “C” and “m” that characterize Paris’s law.
// questions and answers
clear up your doubts
Are you accredited for these tests?
Yes, we are accredited according to UNI CEI EN ISO/IEC 17025:2018.
What are the standards you use?
Tests are conducted according to ASTM, ISO and BS international standards.
What materials can you test?
We can test steels, metal alloys and welded joints.
What is the turnaround time for receiving test results?
On average, results are provided in 8 working days.
What information is reported in the test reports?
Our reports include detailed data on the mechanical properties of the material, such as fracture toughness and toughness.
How many fracture mechanics tests can you perform in a day?
We can perform up to 20 fracture mechanics tests per day, depending on the complexity of the samples.
What types of fracture mechanics tests do you offer?
We offer fracture toughness, Crack Tip Opening Displacement (CTOD) and Stress Intensity Factor (KIC) tests.
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