Design Assisted by Testing

(1)P Verification of the fatigue resistance of a design by appropriate testing shall be accepted as an alternative method to those given in 2.2 and 2.3.

(2)P Where there are insufficient data for complete verification of a design by calculation alone in accordance with 2.1 or 2.2, supplementary evidence shall be provided by a specific testing programme. In which case test data may be required for one or more of the following reasons:

a) The applied loading history or spectrum, for either single or multiple loads, is not available and is beyond practical methods of theoretical calculation (see 3.1 and 3.2). This may apply particularly to moving, hydraulically or aerodynamically loaded structures where dynamic or resonance effects can occur. Guidance on methods of test is given in Annex C. 1.

b) The geometry of the structure is sufficiently complex that estimates of member forces or local stress fields are beyond practical methods of calculation (see 4). Guidance on methods of test is given in Annex C.2.

c) The materials, dimensional details, or methods of manufacture of members or joints are different from those given in tables 5.1.1 to 5.1.5. Guidance on methods of test is given in Annex C.3.

d) Crack growth data are needed for damage tolerant design verification.

(3)P Testing may be carried out on complete prototype or production structures or on component parts of those structures. The degree to which the materials, dimensional details and methods of manufacture of the test structure or component shall match the final production structure shall take in to account the type of information being derived from the test.

(4)P Test data shall only be used in lieu of standard data if it is obtained and applied using controlled procedures (see Annex C.3).

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