ISO 3800:1993 PDF

Name: ISO 3800:1993 — Threaded fasteners — Axial load fatigue testing — Test methods and evaluation of results
SKU: ISO 3800:1993
Price: 25 EUR
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Threaded fasteners — Axial load fatigue testing — Test methods and evaluation of results

Название (английский):

ISO 3800:1993

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

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 17
Дата публикации:: 23 декабря 1993 г.
Издание:: ISO IS 3800 edition 1 version 1
ICS:: 21.060.01

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Описание (английский):

Specifies the conditions for carrying out the tests 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 influence of the compliance of clamped parts on the strain of the fastener is not taken into account. 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.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 3800:1993 - Threaded fasteners: Axial load fatigue testing - Test methods and evaluation of results specifies standardized methods for determining the axial fatigue behaviour of threaded fasteners. It defines test conditions (unless agreed otherwise, fluctuating tension at room temperature), minimum requirements to reduce test-condition influence, and procedures for calibration and centring control of test apparatus. The standard is intended to produce comparable S/N (Wöhler) curves and fatigue-strength data for quality control, product specification and design verification.

Key topics and technical requirements

Test type and scope: Fluctuating axial tension tests with loading centric along the fastener axis; compliance of clamped parts is not taken into account. Failure is normally defined as complete separation of the fastener unless otherwise specified.

Apparatus and accuracy:

Testing machines must maintain loads within ±2% of required values and record cycle counts.
Frequency range of testing: 4.2 Hz to 250 Hz; sinusoidal loading required.
Machines must not automatically restart after power interruption.

Fixtures and alignment:

Detailed requirements for test fixtures, inserts and threaded adapters to ensure concentricity and perpendicularity.
Alignment checks using a load verification stud with strain gauges; parallel part length of the stud = four times its diameter.
Self-aligning devices are not recommended (if used, alignment must be verified).

Specimen preparation:

Test nuts generally used once; threaded adapters may be reused if undamaged.
Test washers/chamfers may be used to clear head fillets; washer hardness should match fixtures.
Specimens cleaned and lightly oiled prior to testing.

Test procedures and statistical evaluation:

Tests are performed in the finite-life range and the transition (infinite-life) range to determine S/N curves.
Finite-life testing: minimum of six specimens per stress level; sample sizes often increased by ~10% to allow for contingencies.
Transition-range evaluation typically requires ~15–20 specimens to estimate fatigue strength within about ±5%.
Statistical methods include Gaussian probability plotting, staircase (stepwise) and boundary/arc-sine approaches to estimate median fatigue strength (N50) and confidence limits.

Environmental and monitoring:

Tests conducted at room temperature; specimen temperature rise should not exceed 50 °C (measured at first engaged thread).
Atmospheric conditions (e.g., humidity) should be controlled/recorded where possible.

Applications and who uses it

Fastener manufacturers for product qualification and production quality control

Test laboratories performing axial fatigue characterization of bolts, screws and studs

Automotive, aerospace, heavy machinery and civil engineers specifying fastener fatigue strength for design and safety evaluations

Procurement and quality assurance teams to verify conformity to fatigue performance claims

Keywords: ISO 3800:1993, axial load fatigue testing, threaded fasteners, S/N curve, fatigue strength, test methods, testing machine calibration, test fixtures, statistical evaluation.

ISO 3800:1993 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

SIST ISO 3800:2000

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