What is Impact Testing?
When it comes to gauging the durability of metal components, Charpy, IZOD, Instrumental, Drop-Weight, and Dynamic Tear Testing are just some of the impact testing that Infinita Lab is equipped to do.
Toughness can be evaluated by impact tests. The capacity of a substance to absorb energy during plastic deformation is a measure of its toughness. Because they can only undergo a minimal amount of plastic deformation before breaking, brittle materials are not very tough. A material’s impact value may also vary with temperature. In general, a material’s impact energy will decrease as its temperature drops. In addition to allowing a varying amount of flaws in the material to function as stress risers and reduce the impact energy, the size of the specimen may also alter the value of the Izod impact test.
Charpy and IZOD specimen configurations are the most popular types of impact testing specimens. The Charpy Impact Tests are run on instrumented machines with force gauges ranging from less than 1 foot-pound to more than 300 foot-pounds and temperature gauges from -320 degrees Fahrenheit to over 2000 degrees Fahrenheit. With the ability to impact test sub size specimens down to 14 sizes, the available impact test specimen types are V-Notch, U-Notch, Key-Hole Notch, Un-notched, and ISO (DIN) V-Notch. Standard single notch and type-X3 specimens can withstand 240 foot-pounds of force during IZOD impact testing.
Examining the Charpy Effect
The energy absorbed by a material during fracture can be measured using a standardized high strain-rate test, often known as the Charpy V-notch test. This energy absorption is used as a probe into the ductile-brittle transition as a function of temperature.
IZOD Impact Strength Evaluation
The Izod impact test is an ASTM standard for measuring the toughness of various materials against impacts. The potential energy of a pivoting arm is kept constant by raising it to a certain height before it is released. A notch in the sample causes the arm to swoop down and smash it. The height the arm travels to after striking the sample is used to determine the amount of energy that was transferred to the sample. Impact energy and notch sensitivity can be calculated with the use of a notch-marked sample.
The test is quite similar to the Charpy impact test, with the exception that the specimen is set up differently. The sample in an Izod impact test is held in a cantilevered beam configuration as opposed to a three-point bending configuration like in a Charpy impact test.
Drops, blows, collisions, and other forms of impact can be replicated through instrumented impact testing.
Experiment with Measured Impact
The material has a low energy absorption rate in typical tests like tensile and flexural loading.
Materials must frequently absorb energies from impacts, drops, strikes, collisions, and other common events. These kinds of settings are what instrumented impact testing is meant to mimic. Instrumented Impact Testing is available from Infinita Lab.
Graphite-epoxy, fiberglass, polycarbonate, and sheet steel are just some of the thick panel specimens that can be put through penetration testing.Pipe, appliance housings, safety helmets, and automotive parts are just some of the major components that can be tested for energy absorption and fracture resistance.
ASTM E-604 dynamic tear test, ASTM E-436 drop weight tear test, and ASTM E-208 nil-ductility test are all examples of ASTM’s three-point bend testing to specified geometries.
Weight Loss Experiment
Drop testing is done in accordance with ASTM E208. The NDT of a material can be calculated by performing this test on it. Whether you need high-temperature testing or testing at temperatures as low as -320 degrees Fahrenheit, we can accommodate you.
According to ASTM International, the Dynamic Tear Test (ASTM E604) is the standard test method for dynamic tear testing of metallic materials. There are a wide variety of R&D uses for dynamic tear testing. Used to investigate how changing factors in processing, heat treatment, and material composition affect a material’s dynamic rip fracture resistance. The influence of production methods on dynamic tear fracture resistance may be accurately measured. When a baseline correlation between dynamic tear energy and actual performance has been established, this impact test can also be used to assess the suitability of selecting a material for an application.
Standard American Technical Manuals E23 E208 E604 E436
ANSI/ASTM E23M
Methods of Standardization for Impact Testing with a Notched Bar on Metals
An impact test consists of a moving mass with enough energy to break the specimen placed in its path, a suitable specimen (several types of specimens are recognized), a set of anvils and specimen supports on which the test specimen is placed to receive the blow of the moving mass, and a device for measuring the energy absorbed by the broken specimen.
ASTM E208
Method for the Zero-Ductility Transition Temperature Testing of Ferritic Steels Using a Drop Weight
In the drop-weight test, basic beam specimens are used, with their tensile surfaces pre-prepared to crack at an early stage of the test. The maximum temperature at which a specimen breaks is determined by subjecting a series (often four to eight) of specimens of a specific material to a constant impact force at a succession of carefully chosen temperatures. Depending on the yield strength of the steel being tested, an impact force of 250 to 1400 ftlbf (340 to 1900 J) is delivered using a guided, free-falling weight. A stop prevents the specimens from bending more than a few thousandths of an inch.
ASTM E604
Dynamic tear testing of metallic materials according to ASTM E604 – 15.
Resistance to rapid, progressive fracturing can be quantified by the DT energy value. The increased resistance that can form during the approximately one plate thickness of crack extension from a sharp notch is of great interest in a number of applications. A lengthy fracture path is built into the testing procedure, allowing the results to be used as a proxy for this quality.
ASTM E436
Method of Standardization for Tear Testing Ferritic Steels by Drop Weight
Plain carbon or low-alloy pipe steels (yield strengths less than 825 MPa) can be tested using this technique to see how propagating cracks look when they cross the temperature threshold from brittle (cleavage or flat) to ductile (shear or oblique).
Capacity to Subject to Heat Treatment
Infinita Lab has in-house heat treating capability. Thermo-mechanical processing of all kinds is well within the capabilities of our facilities.
Iron-based alloys
- Thermal Environment Simulators and Radiant Furnaces
- heating to temperatures as high as +2750 °F for treatments such annealing, spheroidizing, stress-relieving normalizing, quenching, and tempering
- -320 degrees Fahrenheit cryotherapy
Non-ferrous alloys consist of:
Solution Treating, Annealing, and Artificial Aging in Furnaces that Reach 1200°F Thanks to Forced Convection
Production-Based Mechanical Design Analysis
Experts and engineers in mechanical engineering evaluate working prototypes of individual parts and whole products right on site. Our mechanical engineers can help our various testing divisions provide timely data to clients by designing and fabricating unique setups and doing the tests themselves.
Machine Shop on Premises
Infinita Lab features a clean, temperature-controlled environment and cutting-edge machinery, allowing for in-house machining of all test specimens. Our machine shop is not only equipped to machine standard specimens but also to design and machine fixtures for testing completed components, non-standard shapes, and unusual or exotic materials.
Production work from other labs and mills comes to us because of our stellar reputation for precision machining and quick turnaround. Our cutting-edge in-house skills and extensive engineering experience have earned us a reputation as experts in low-stress grinding and machining of sub-size specimens to extremely tight tolerances.
