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BSI
BS 7774:1994

BS 7774:1994

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The latest, up-to-date edition.

Threaded fasteners. Axial load fatigue testing. Test methods and evaluation of results

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

08-15-1994

Publisher

British Standards Institution

Committees responsible
National foreword
Specification
1 Scope
2 Normative references
3 Symbols and their designations
4 Principle
5 Apparatus
6 Test procedure
7 Evaluation of results
8 Test report
Tables
1 Symbols and their designations
2 Order system for the statistical evaluation of 8
    fatigue tests with a stress amplitude of sigma a =
    150 N/mm2 in the finite life range
3 Example of the evaluation of fatigue tests by the
    staircase method
Figures
1 Fixture without insert
2 Fixture with insert
3 Load verification stud
4 Stress distribution in the shank of the load
    verification stud
5 Threaded test adapter
6 Test washer (assembled)
7 Location of test nut
8 Probability of failure pf and number of stress
    cycles in the finite life range, determined on the
    basis of 8 fatigue tests with sigma a = 150 N/mm2
9 Example of the execution and evaluation of fatigue
    tests according to the boundary method
10 Wohler curve (S/N curve) sigma a = f(N)
11 Example of basic pattern of combined test method
    with 14 specimens
12 Example of Wohler curve (S/N curve)
13 Haigh diagram

Specifies the conditions for carrying out axial load fatigue tests on threaded fasteners, as well as recommendations for the evaluation of the results. Includes tables, diagrams, and symbols and their designations.

This International Standard specifies the conditions for carrying out axial load fatigue tests on threaded fasteners, as well as recommendations for the evaluation of the results.

Unless otherwise agreed, the tests are of the fluctuating tension type and are carried out at room temperature, the loading applied being centric along the longitudinal axis of the fastener. The influence of the compliance of clamped parts on the strain of the fastener is not taken into account.

This method allows determination of the fatigue strength of threaded fasteners.

The test results can be influenced by the test conditions. For this reason, minimum requirements are specified to reduce this effect. In addition, calibration and centring control methods for the testing apparatus are included.

Committee
FME/9
DevelopmentNote
Also numbered as ISO 3800 Supersedes 91/83077 DC (10/2005)
DocumentType
Standard
Pages
24
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
SNV ISO 3800 : 1993 Identical

BS EN 24033:1992 Hexagon nuts, style 2. Product grades A and B
BS 4395-1:1969 Specification for high strength friction grip bolts and associated nuts and washers for structural engineering General grade
BS 4190:1967 Specification for ISO metric black hexagon bolts, screws and nuts
BS 4183:1967 Specification for machine screws and machine screw nuts. Metric series
BS EN 20273:1992 Fasteners. Clearance holes for bolts and screws
BS EN 28673:1992 Hexagon nuts, style 1, with metric fine pitch thread. Product grades A and B
BS 4395-2:1969 Specification for high strength friction grip bolts and associated nuts and washers for structural engineering Higher grade bolts and nuts and general grade washers
ISO 554:1976 Standard atmospheres for conditioning and/or testing — Specifications
BS EN 24032:1992 Hexagon nuts, style 1. Product grades A and B
BS EN 28674:1992 Hexagon nuts, style 2, with metric fine pitch thread. Product grades A and B

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