May Number of pages: The test report must first describe which test fittings were utilized in detail and include the number used, their dimensions, material and surface designations and quality categories. And a considerable advance on the old DIN test conditions is that the new test must match the likely application and operating conditions of the fastener as closely as possible.
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There are now Junker Test Benches available that can automate this element of the reporting 65511. Frances Date of publication: But now that has all changed, with the publication in of the new DIN The new DIN spells out in detail that the test fittings should include the bolt and nut in standardized dimensions, and a washer, which is another new feature.
Giudicelli Date of publication: Vibration testing must be completed using a test block that, when the schematic provided of the test equipment to be used is examined, is to all intents and purposes a Junker Test Bench.
DIN – Important New Standard for Testing Fasteners | Vibrationmaster
Legal notices Photo credits FAQ. Next, the DIN asks the test technician to record the:. Effectively, what the new DIN demands is much greater rigor when recording test results.
Click here for online version Fastener and Fixing Magazine, September Thomas Date of publication: For the first time, the new DIN allows researchers, test engineers and clients worldwide to conduct fastener vibration tests that genuinely compare like with like. The objective of the next stage is to test the performance of the securing element of the fastener and to find out at what point it starts to loosen.
May Number of pages: First, there must be 12 verification tests for each set of measurements recorded from the reference test. But if a Junker Test Bench from a test equipment manufacturer has been used, then the specification manual that comes with the equipment can be used to detail how it has been constructed.
Clearly, one of the most important parts of the final test report is the plot of the pre-stressing force against the number of load cycles.
The rest of the testing program will depend on this initial stage. There are some important points to note here. Engineers will have greater confidence when specifying fasteners that have been tested to, and shown to comply with, the new standard.
It fin also be a painfully slow process with some Junker Test Bench models that require manual operation and set-up. The test report must first describe which test fittings were utilized in detail and include the number used, their dimensions, material and surface designations and quality categories.
The new reporting requirements of DIN mean that some models of Junker Test Benches and many test rigs will simply be unable to provide the level of detail required, nor in a format that can be easily converted into a report format.
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Discover also Certification, assessment, diagnosis Get a quote for certification of systems, products or services, and get certified. And, based on the plot of the pre-stressing force against cin number of load cycles, the pre-stressing force curve must show that it is unlikely that the fastener would have failed if the test continued beyond cycles.
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This is no longer acceptable, meaning fasteners rated on this basis will fail the new DIN. Select the 61551 category of products searched and follow the instructions. The Junker Test, as it became known and was later prescribed by the original DINtested the self-loosening behavior of fasteners under transverse loading conditions by vibration testing. Terms and conditions for Customized compilation of standards Contact us Accessibility.
From the outset, it should be known that detail is a key factor. Having completed the 12 verification tests, the next stage is to plot the results of the pre-stressing force against the number of load cycles.
This also gives greater confidence to engineers specifying components, because the testing standards of critical fasteners are so much tougher than under DIN The washer is now included to play the part of the surface that would normally support the fastener when used in practice.
Next, the DIN asks dkn test technician to record the: