BS ISO 16130:2015 pdf download.Aerospace series — Dynamic testing of the locking behaviour of bolted connections under transverse loading conditions (vibration test)
1 Scope
This International Standard applies to the dynamic testing of the locking behaviour of bolted connections in order to investigate the self-loosening behaviour of fasteners for aerospace applications and is mainly intended for development work.
As test apparatuses are different (e.g. stiffness distribution), testing in accordance with this International Standard, therefore, does not allow an absolute statement to be made on the locking behaviour of bolted assemblies under service loads.
Thus, the objective of this test is a comparative evaluation of locking elements under defined test conditions.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 16047, Fasteners — Torque/clamp force testing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16047 and the following apply.
3.1 clamp force
axial tension acting on the bolt shank or compression acting on the clamped member
[SOURCE: ISO 16047:2005, 3.1; modified — without restriction “during tightening”]
3.2 ultimate clamp force
theoretical maximum clamp force under combined stress condition potentially induced before bolt/nut failure
[SOURCE: ISO 16047:2005, 3.3, modified]
5.2 Test machine description
The machine (see Figure 2 for an example of a vibration testing machine) essentially consists of e.g. a motor drive or a hydraulic drive generating a transverse displacement in the test fixture. The test fixture consists of a stationary base and a floating glider plate which acts as clamped members in the bolted joint in which the fastener to be tested is installed. The glider plate contains a rotationally immobilized washer (test washer). The stationary base accommodates a clamp force-sensor for measuring the clamp force between the glider plate and the stationary base. In the force-sensor, a test insert is used that it is locked to prevent it from rotating. The relative movement between the stationary base and the glider plate is measured with a displacement sensor.
The reference tests are to be carried out on an unsecured bolted joint, assembled in the same way, and with the same parameters as specified for the verification tests that will determine the securing effect of the securing element under test. During the reference tests, the effective transverse displacement is varied through corresponding adjustments to the drive for the test equipment (the stroke). For reasons of reproducibility, the transverse displacement at which the pre-stressing force is fully lost after 300 ± 100 load cycles shall be ascertained three times, using new parts each time. This transverse displacement provides the basis for the verification tests.
BS ISO 16130:2015 pdf download
