Rated tensile force test of wire rope slings
2025-08-19
I. Experimental Objectives
Verify whether the wire rope rigging has reached the designed rated tensile force (i.e., the maximum tensile force that the rigging can safely withstand under specified conditions).
Check whether the rigging has abnormal deformation or damage (such as broken wires, cracks, loose joints, etc.) under the rated load to ensure that its mechanical properties meet the usage requirements.
Ii. Based on standards
The rated tensile force test of domestic wire rope slings shall comply with the following national standards (with slight differences among different types of slings) :
GB/T 16271-2009 "Wire Rope Slings with Braided Buckles" (Applicable to braided rigging)
GB/T 16762-2009 "Characteristics and Technical Conditions of Wire Rope Slings for General Purposes" (Applicable to types of slings such as pressed and cast ones)
JB/T 8112-2011 "Technical Conditions for Wire Rope Slings" (General Technical Requirements).

International standards can refer to ISO 18357 "Safe Use and Maintenance of Wire Rope Slings", EN 13414 "Code for Wire Rope Slings", etc.

Iii. Experimental Preparation
1. Sample requirements
The samples must be brand-new and unused rigging, and their structure, materials and processes should be consistent with those of the mass-produced products (such as wire rope specifications, joint types: pressing, braiding, casting, etc.).
The sample length should meet the clamping requirements of the tensile testing machine (usually sufficient clamping sections are reserved at both ends to avoid the clamping part affecting the test results).
2. Equipment Requirements
Tensile testing machine: It needs to undergo metrological calibration. The measurement range should cover 1.2 to 2 times the rated tensile force of the rigging (to ensure test accuracy), and it should be equipped with functions such as force value display, loading speed control, and load holding timing.
Clamping device: Select the appropriate fixture (such as wedge fixture, winding fixture) based on the type of rigging to avoid damaging the steel wire rope or causing local stress concentration during clamping.
Auxiliary tools: tape measure (for measuring deformation), marker pen (for marking the initial position), camera (for recording damage conditions), etc.


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