Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
The standard GB/T 2423 Environmental testing - Part 2: Test methods is divided into several parts according to test methods.
This part is Part 5 of GB/T 2423.
This standard is developed in accordance with the rules given in GB/T 1.12009.
This part replaces GB/T 2423.5-1995 Environmental testing - Part 2: Test methods - Test Ea and guidance: Shock and GB/T 2423.6-1995 Environmental testing - Part 2: Test methods - Test Eb and guidance:
Bump. This part integrates the contents of GB/T 2423.5-1995 and GB/T 2423.6-1995. The following main technical changes have been made with respect to GB/T 2423.5-1995 and GB/T 2423.6-1995:
——the cut-off frequency requirement for low-pass filter is added to the measurement system of Sub-clause;
——in Clause 5, the requirements for impact times in each direction are added;
——the table in Figure 4 combines the tables in Figure 4 of the original GB/T 2423.5-1995 and in Figure 2 of GB/T 2423.6-1995;
——the severity level in Table 1 is added.
This part, by means of translation, is identical to IEC 60068-2-27: 2008 Environmental testing - Part 2: Test methods - Test Ea and guidance: Shock.
The Chinese documents identical to the normative international documents given in this part are as follows:
——GB/T 2421.1-2008 Environmental testing - Part 1: General and guidance (IEC 60068-1: 1988, IDT);
——GB/T 2423.39-2018 Environmental testing - Part 2: Test methods - Test Ee and guidance: Loose cargo testing including bounce (IEC 60068-2-55: 2013, IDT);
GB/T 4798.1 - 2005 Environmental conditions existing in the application of electric and electronic products - Section 1: Storage (IEC 60721-3-1: 1997, MOD);
——GB/T 4798.5-2007 Environmental conditions existing in the application of electric and electronic products - Section 5: Ground vehicle installations (IEC 60721-3-5: 1997, MOD).
The following editorial changes have been made in this part:
——the name of this standard is modified;
This part was proposed and is under the jurisdiction of SAC/TC 8 National Technical Committee on Environmental Conditions and Testing for Electric and Electronic Products and of Standardization Administration of China.
This part replaces GB/T 2423.5-1995 and GB/T 2423.6-1995.
The previous edition of GB/T 2423.5-1995 is as follows:
——GB/T 2423.5-1981.
The previous editions of GB/T 2423.6-1995 are as follows:
——GB/T 2423.6-1981.
——GB/T 2424.4-1981.
Environmental testing - Part 2: Test methods - Test Ea and guidance: Shock
1 Scope
This part of GB/T 2423 provides a standard procedure for determining the ability of a specimen to withstand specified severities of non-repetitive or repetitive shocks.
The purpose of this test is to reveal mechanical weakness and/or degradation in specified performances, or accumulated damage or degradation caused by shocks. In conjunction with the relevant specification, this may be used in some cases to determine the structural integrity of specimens or as a means of quality control (see Sub-clause A.2).
This test is primarily intended for unpackaged specimens and for items in their transport case when the latter may be considered to be part of the specimen. If an item is to be tested unpackaged, it is referred to as a test specimen. However, if the item is packaged, then the item itself is referred to as product and the item and its packaging together are referred to as a test specimen. GB/T 2423.43-2008 may be used for testing packaged products.
This standard is written in terms of prescribed pulse shapes. Guidance for the selection and application of these pulses is given in Annex A and the characteristics of the different pulse shapes are discussed in Annex B.
Wherever possible, the test severity and the shape of the shock pulse applied to the specimen shall be such as to reproduce the effects of the actual transport or operational environment to which the specimen will be subjected, or to satisfy the design requirements if the object of the test is to assess structural integrity (see Sub-clauses A.2 and A.4).
For the purposes of this test, the specimen is always mounted to the fixture or the table of the shock testing machine during testing.
Note: The term "shock testing machine" is used throughout this standard, but other means of applying pulse shapes are not excluded.
One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 2423.43-2008 Environmental testing for electric and electronic products - Part 2: Test methods - Mounting of specimens for vibration, impact and similar dynamic tests (IEC 60068-2-47: 2005, IDT);
IEC 60068-1 Environmental testing - Part 1: General and guidance
IEC 60068-2-55 Environmental testing - Part 2-55: Tests - Test Ee and guidance: Bounce
IEC 60721-3-1 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 1: Storage
IEC 60721-3-5 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 5: Ground vehicle installations
Guide 104 The preparation of safety publications and the use of basic safety publications and group safety publications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
Note: The terms used are, for the most part, defined in ISO 2041[1]1)or IEC 60068-1. The following additional terms and definitions are also applicable for the purposes of this standard.
3.1
check point
point located on the fixture, on the table surface of the shock-testing machine or on the specimen as close as possible to the fixing point, and in any case rigidly connected to it
Notes:
1 A number of check points are used as a means of ensuring that the test requirements are satisfied.
2 If more than four fixing points exist, the relevant specification should state the number of fixing points to be used as check points.
3 In special cases, for example, for large or complex specimens, the check points will be prescribed by the relevant specification if not close to the fixing points.
4 Where a large number of small specimens are mounted on one fixture, or in the case of a small specimen where there are a number of fixing points, a single check point (that is the reference point) may be selected for the derivation of the control signal. This signal is then related to the fixture rather than to the fixing points of the specimen(s). This procedure is only valid when the lowest resonance frequency of the loaded fixture is well above the upper frequency of the test.
3.2
fixing point
part of the specimen in contact with the fixture or the table of the shock-testing machine at a point where the specimen is normally fastened in service
Note: If a part of the real mounting structure is used as the fixture, the fixing points are taken as those of the mounting structure and not of the specimen.
3.3
gn
standard acceleration due to the earth's gravity, which itself varies with altitude and geographical latitude
Note: For the purposes of this standard, the value of gn is rounded up to the nearest unity, which is 10 m/s2.
3.4
repetition rate
number of shocks per second
3.5
shock severity
combination of the peak acceleration, the duration of the nominal pulse and the number of shocks
3.6
velocity change
absolute value of the sudden change of velocity resulting from the application of the specified acceleration
Note: The change of velocity is normally considered sudden if it takes place in a time that is short compared with the fundamental period of the test specimen.
4 Description of test apparatus
4.1 Required characteristics
When the shock-testing machine with or without fixture is loaded with the specimen, the waveform measured at the check point(s) shall consist of a pulse approximating to one of the nominal acceleration against time curves given by the broken lines in Figures 1, 2 and 3.
4.1.1 Basic pulse shapes
Three types of pulse, namely the half-sine pulse, the final-peak saw-tooth pulse and the trapezoidal pulse, are included in this standard. The choice of pulse shape depends on a number of factors, and the difficulties inherent in making such a choice preclude a preferred order being given in this standard (see Clause A.3).
The specified basic pulse shapes are given below (see Clause A.3):
——half-sine: one half-cycle of a sine wave, as shown in Figure 1;
——final-peak saw-tooth: asymmetrical triangle with short fall time, as shown in Figure 2;
——trapezoidal: symmetrical trapezoid with short rise and fall times, as shown in Figure 3.
The true value of the actual pulse shall be within the limits of tolerance shown by the solid lines in the relevant figure.
Note: Where it is not practicable to achieve a pulse shape falling within the specified tolerance, the relevant specification should state the alternative procedure to be applied (see Sub-clause A.5).
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Description of test apparatus 4.1 Required characteristics 4.2 Measuring system 4.3 Mounting 5 Severities 6 Preconditioning 7 Initial measurements and functional performance test 8 Testing 9 Recovery 10 Final measurements 11 lnformation to be given in the relevant specification 12 lnformation to be given in the test report Annex A (Normative) Selection and application of pulse shapes - Guidance Annex B (Informative) Shock response spectra and other characteristics of pulse shapes Annex C (Informative) Comparison between impact tests Bibliography
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
The standard GB/T 2423 Environmental testing - Part 2: Test methods is divided into several parts according to test methods.
This part is Part 5 of GB/T 2423.
This standard is developed in accordance with the rules given in GB/T 1.12009.
This part replaces GB/T 2423.5-1995 Environmental testing - Part 2: Test methods - Test Ea and guidance: Shock and GB/T 2423.6-1995 Environmental testing - Part 2: Test methods - Test Eb and guidance:
Bump. This part integrates the contents of GB/T 2423.5-1995 and GB/T 2423.6-1995. The following main technical changes have been made with respect to GB/T 2423.5-1995 and GB/T 2423.6-1995:
——the cut-off frequency requirement for low-pass filter is added to the measurement system of Sub-clause;
——in Clause 5, the requirements for impact times in each direction are added;
——the table in Figure 4 combines the tables in Figure 4 of the original GB/T 2423.5-1995 and in Figure 2 of GB/T 2423.6-1995;
——the severity level in Table 1 is added.
This part, by means of translation, is identical to IEC 60068-2-27: 2008 Environmental testing - Part 2: Test methods - Test Ea and guidance: Shock.
The Chinese documents identical to the normative international documents given in this part are as follows:
——GB/T 2421.1-2008 Environmental testing - Part 1: General and guidance (IEC 60068-1: 1988, IDT);
——GB/T 2423.39-2018 Environmental testing - Part 2: Test methods - Test Ee and guidance: Loose cargo testing including bounce (IEC 60068-2-55: 2013, IDT);
GB/T 4798.1 - 2005 Environmental conditions existing in the application of electric and electronic products - Section 1: Storage (IEC 60721-3-1: 1997, MOD);
——GB/T 4798.5-2007 Environmental conditions existing in the application of electric and electronic products - Section 5: Ground vehicle installations (IEC 60721-3-5: 1997, MOD).
The following editorial changes have been made in this part:
——the name of this standard is modified;
This part was proposed and is under the jurisdiction of SAC/TC 8 National Technical Committee on Environmental Conditions and Testing for Electric and Electronic Products and of Standardization Administration of China.
This part replaces GB/T 2423.5-1995 and GB/T 2423.6-1995.
The previous edition of GB/T 2423.5-1995 is as follows:
——GB/T 2423.5-1981.
The previous editions of GB/T 2423.6-1995 are as follows:
——GB/T 2423.6-1981.
——GB/T 2424.4-1981.
Environmental testing - Part 2: Test methods - Test Ea and guidance: Shock
1 Scope
This part of GB/T 2423 provides a standard procedure for determining the ability of a specimen to withstand specified severities of non-repetitive or repetitive shocks.
The purpose of this test is to reveal mechanical weakness and/or degradation in specified performances, or accumulated damage or degradation caused by shocks. In conjunction with the relevant specification, this may be used in some cases to determine the structural integrity of specimens or as a means of quality control (see Sub-clause A.2).
This test is primarily intended for unpackaged specimens and for items in their transport case when the latter may be considered to be part of the specimen. If an item is to be tested unpackaged, it is referred to as a test specimen. However, if the item is packaged, then the item itself is referred to as product and the item and its packaging together are referred to as a test specimen. GB/T 2423.43-2008 may be used for testing packaged products.
This standard is written in terms of prescribed pulse shapes. Guidance for the selection and application of these pulses is given in Annex A and the characteristics of the different pulse shapes are discussed in Annex B.
Wherever possible, the test severity and the shape of the shock pulse applied to the specimen shall be such as to reproduce the effects of the actual transport or operational environment to which the specimen will be subjected, or to satisfy the design requirements if the object of the test is to assess structural integrity (see Sub-clauses A.2 and A.4).
For the purposes of this test, the specimen is always mounted to the fixture or the table of the shock testing machine during testing.
Note: The term "shock testing machine" is used throughout this standard, but other means of applying pulse shapes are not excluded.
One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 2423.43-2008 Environmental testing for electric and electronic products - Part 2: Test methods - Mounting of specimens for vibration, impact and similar dynamic tests (IEC 60068-2-47: 2005, IDT);
IEC 60068-1 Environmental testing - Part 1: General and guidance
IEC 60068-2-55 Environmental testing - Part 2-55: Tests - Test Ee and guidance: Bounce
IEC 60721-3-1 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 1: Storage
IEC 60721-3-5 Classification of environmental conditions - Part 3: Classification of groups of environmental parameters and their severities - Section 5: Ground vehicle installations
Guide 104 The preparation of safety publications and the use of basic safety publications and group safety publications
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
Note: The terms used are, for the most part, defined in ISO 2041[1]1)or IEC 60068-1. The following additional terms and definitions are also applicable for the purposes of this standard.
3.1
check point
point located on the fixture, on the table surface of the shock-testing machine or on the specimen as close as possible to the fixing point, and in any case rigidly connected to it
Notes:
1 A number of check points are used as a means of ensuring that the test requirements are satisfied.
2 If more than four fixing points exist, the relevant specification should state the number of fixing points to be used as check points.
3 In special cases, for example, for large or complex specimens, the check points will be prescribed by the relevant specification if not close to the fixing points.
4 Where a large number of small specimens are mounted on one fixture, or in the case of a small specimen where there are a number of fixing points, a single check point (that is the reference point) may be selected for the derivation of the control signal. This signal is then related to the fixture rather than to the fixing points of the specimen(s). This procedure is only valid when the lowest resonance frequency of the loaded fixture is well above the upper frequency of the test.
3.2
fixing point
part of the specimen in contact with the fixture or the table of the shock-testing machine at a point where the specimen is normally fastened in service
Note: If a part of the real mounting structure is used as the fixture, the fixing points are taken as those of the mounting structure and not of the specimen.
3.3
gn
standard acceleration due to the earth's gravity, which itself varies with altitude and geographical latitude
Note: For the purposes of this standard, the value of gn is rounded up to the nearest unity, which is 10 m/s2.
3.4
repetition rate
number of shocks per second
3.5
shock severity
combination of the peak acceleration, the duration of the nominal pulse and the number of shocks
3.6
velocity change
absolute value of the sudden change of velocity resulting from the application of the specified acceleration
Note: The change of velocity is normally considered sudden if it takes place in a time that is short compared with the fundamental period of the test specimen.
4 Description of test apparatus
4.1 Required characteristics
When the shock-testing machine with or without fixture is loaded with the specimen, the waveform measured at the check point(s) shall consist of a pulse approximating to one of the nominal acceleration against time curves given by the broken lines in Figures 1, 2 and 3.
4.1.1 Basic pulse shapes
Three types of pulse, namely the half-sine pulse, the final-peak saw-tooth pulse and the trapezoidal pulse, are included in this standard. The choice of pulse shape depends on a number of factors, and the difficulties inherent in making such a choice preclude a preferred order being given in this standard (see Clause A.3).
The specified basic pulse shapes are given below (see Clause A.3):
——half-sine: one half-cycle of a sine wave, as shown in Figure 1;
——final-peak saw-tooth: asymmetrical triangle with short fall time, as shown in Figure 2;
——trapezoidal: symmetrical trapezoid with short rise and fall times, as shown in Figure 3.
The true value of the actual pulse shall be within the limits of tolerance shown by the solid lines in the relevant figure.
Note: Where it is not practicable to achieve a pulse shape falling within the specified tolerance, the relevant specification should state the alternative procedure to be applied (see Sub-clause A.5).
Contents of GB/T 2423.5-2019
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Description of test apparatus
4.1 Required characteristics
4.2 Measuring system
4.3 Mounting
5 Severities
6 Preconditioning
7 Initial measurements and functional performance test
8 Testing
9 Recovery
10 Final measurements
11 lnformation to be given in the relevant specification
12 lnformation to be given in the test report
Annex A (Normative) Selection and application of pulse shapes - Guidance
Annex B (Informative) Shock response spectra and other characteristics of pulse shapes
Annex C (Informative) Comparison between impact tests
Bibliography
