GB/T 238-2013Metallic materials -- Wire -- Reverse bend test (English PDF)

GB/T 238-2013 is the English-translated version of 金属材料 线材 反复弯曲试验方法.

GB/T 238-2013 — This standard specifies the test methods for metal wire repeated bending principles, symbols, test equipment, samples, test procedures and test reports.

This standard applies to the determination of feature size or diameter plastic deformation of 0.3mm ~ 10mm metal wire repeated bending. this Standard features listed diameter size range or may give more specific provisions in the relevant product standard.

2 Symbols and Wire repeated bending test and symbols used are described in Table 1 and Figure 1.

Table 1 Symbols and Symbol Description Unit d wire diameter in mm circular h non-circular metal wire feature size a mm r cylindrical support roll radius mm L Cylindrical roller support lever from the top to the bottom mm dg lever hole diameter mm y two cylindrical support roll axis to the plane of the top surface of the clamp block distance mm T N tension Nb the number of repetitive bending times a non-circular metal wire feature size refers to the cross-sectional height of the sample, usually specified in the relevant standards, as shown in FIG.

Figure 1 A typical non-circular cross-sectional view sample Principle 3 Repeated bending test specimen is fixed at one end, a cylindrical support roll around a predetermined radius of bend 90 °, and then bent in the opposite direction of the repeated bending Test, as shown in Figure 2.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 6 pages — is available in the English PDF.

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