GB/T 34542.2-2018Storage and transportation systems for gaseous hydrogen—Part 2: Test methods for evaluating metallic material compatibility in hydrogen atmosphere (English PDF)

5.2 Test chamber

5.2.1 The materials, design, manufacturing, use management, periodic inspection, etc. of test chamber shall refer to the relevant provisions of TSG 21.

5.2.2 The design of the test chamber shall take into account the effects of fatigue loading and hydrogen on material properties.

5.2.3 The number of pressure cycles in the test chamber design must not be lower than the number of pressure cycles within the expected service life.

5.2.4 It is advisable to use an appropriate equipment to balance the axial force of the gas pressure on the loading rod.

5.3 Measuring equipment

5.3.1 Internal measuring equipment

5.3.1.1 The internal measuring equipment shall be able to withstand the pressure in the test chamber and have the precision and resolution required for the test.

5.3.1.2 The electronic components of the internal measuring equipment shall […]

7.2.3 Test report

The test report shall at least contain the following information.

a) Test conditions.

1) material designation, specification, chemical composition, heat treatment state, welding process parameters (if necessary);

2) sample sampling position, sampling orientation, structural size, surface state;

3) gas purity, test temperature, test pressure;

4) temperature-time curve, pressure-time curve of test chamber.

b) Test parameters. strain rate.

c) Test result.

1) stress-strain curve;

2) yield strength, tensile strength, elongation after fracture and reduction of area.

7.3 Fatigue life test

7.3.1 Test equipment and samples

7.3.1.1 Fatigue life test shall use force control or strain control. In addition to the requirements of Clause 5, the test equipment shall also meet the relevant requirements of GB/T 3075 when force control is adopted. When using strain control, it shall also meet the relevant requirements of GB/T 15248 or GB/T 26077.

7.3.1.2 Fatigue life test shall use smooth round bar sample or notched round bar sample. When using force control, the smooth round bar sample shall meet the relevant requirements of GB/T 3075. When using strain control, the smooth round bar sample shall meet the relevant requirements of GB/T 15248 or GB/T 26077. Samples with notched round bars shall be of standard samples as shown in Figure 1, or samples with a notched stress concentration factor […]

7.4.1 Test equipment and samples

7.4.1.1 In addition to the provisions of Clause 5, the test equipment shall also meet the relevant requirements of GB/T 21143.

7.4.1.2 The sample shall meet the relevant requirements of GB/T 21143.

7.4.2 Test procedures

7.4.2.1 The test procedures shall meet the relevant requirements of GB/T 21143.

7.4.2.2 The test shall use displacement control. Use the gap opening displacement or the beam displacement as the control variable.

7.4.2.3 The stress intensity factor rate in the linear elastic region of the sample shall be between 0.1 MPa·m1/2/min ~ 1 MPa·m1/2/min.

7.4.3 Test report

The test report shall at least contain the following information.

a) Test conditions.

1) material designation, specification, chemical composition, heat treatment state, welding process parameters (if necessary);

2) sample sampling position, sampling orientation, structural size, surface state;

3) gas purity, test temperature, test pressure;

4) temperature-time curve, pressure-time curve of test chamber.

b) Test parameters.

1) displacement rate;

2) displacement control method.

c) Test result. fracture toughness value.

7.5 Fatigue crack growth rate test

7.5.1 Test equipment and samples

7.5.1.1 In addition to the provisions of Clause 5, the test equipment shall also meet the relevant requirements of GB/T 6398. […]