MIL-STD-202H.pdf - 第177页

MI L - S TD - 202 -2 11 CO NT E N T S ( c ont i nued) FIGURE PAG E 1. Test conditi on A …… ……… ……………………………………………. . … 3 2 . Test conditi on B …… ……… ……………………………………………. . … 4 3 . Test conditi on C …… ……… ………………………………………………

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MIL-STD-202-211
CONTENTS
PARAGRAPH PAGE
FOREWORD…………………………………………………………. ii
1. SCOPE 1
1.1 Purpose………………………………………….……..…………. 1
2. APPLICABLE DOCUMENTS 1
3. DEFINTIONS 1
4. GENERAL REQUIREMENTS 1
4.1 Test conditions..………………………………….…...…………. 1
4.1.1 Selection..................................................................…………. 1
4.2. Procedure……………………..……………….…………………. 2
4.2.1 Test condition A (pull test)………..………….…………………. 2
4.2.1.1 Method of holding…..………….…………………………..……. 2
4.2.1.2 Applied force..………………….…………………………..……. 2
4.2.1.3 Direction of applied force….……………………………....……. 2
4.2.1.4 Duration of applied force.………………………………....……. 2
4.2.2 Test condition B (flat-terminal bend test)……………......……. 2
4.2.2.1 Starting position of terminal……………….…………….……… 2
4.2.2.2 Bending cycle…………………………………………….……… 2
4.2.2.3 Number of bending operations……………………….………… 2
4.2.3 Test condition C (wire-lead bend test)……………….………… 2
4.2.3.1 Preparation of specimen………….…………………………..… 2
4.2.3.2 Bending cycle…………………………………………….……… 2
4.2.3.3 Number of bending operations……………………….………… 2
4.2.4 Test condition D (twist test).………………………….………… 2
4.2.4.1 Preparation of specimen………….…………………………..… 2
4.2.4.2 Application of torsion……….…………………………..……..… 3
4.2.5 Test condition E (torque test) ………….……………..……..… 3
4.2.5.1 Direction and application of torque….………………..……..… 3
4.2.5.2 Duration of applied force.…………………….………..……..… 3
4.2.5.3 Screw-thread terminals……………….………..……………..… 3
4.2.5.4 Other non-wire, rigid-type terminals….…………..………….… 3
5. DETAILED REQUIREMENTS 7
5.1 Measurements……………………………………..…..…………. 7
5.2. Summary…………………………………………….....…………. 7
6. NOTES 7
6.1 Supersession data………………………………………………. 7
iii
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MIL-STD-202-211
CONTENTS (continued)
FIGURE PAGE
1. Test condition A…………………………………………………………..… 3
2. Test condition B…………………………………………………………..… 4
3. Test condition C…………………………………………………………..… 4
4. Test condition D…………………………………………………………..… 5
5. Test condition D…………………………………………………………..… 6
6. Method of determining equivalent diameter………………….………..… 6
iv
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MIL-STD-202-211
METHOD 211
TERMINAL STRENGTH
1. SCOPE
1.1 Purpose. This test is performed to determine whether the design of the terminals and their method of
attachment can withstand one or more of the applicable mechanical stresses to which they will be subjected during
installation or disassembly in equipment. These stresses must be withstood by the component part without
sustaining damage which would affect either the utility of the terminals or the operation of the component part itself.
Evidence of damage caused by this test may not become evident until subsequent environmental tests are
performed, such as seal, moisture resistance, or life. Procedures are established in this method for testing wire-lead
terminals, flexible-flat-strip or tab-lead terminals, and rigid-type terminals which are threaded or have other
arrangements for attaching conductors. The forces applied consist of direct axial, radial or tension pulls, twist,
bending torsion, and the torque exerted by the application of nuts or screws on threaded terminals. These applied
stresses will disclose poor workmanship, faulty designs, and inadequate methods of attaching terminals to the body
of the part. Other evidence of damage may be disclosed by mechanical distortion of the part, breaking of seals,
cracking of materials surrounding the terminals, or changes in electrical characteristics, such as shorted or
interrupted circuits and changes in resistance values.
2. APPLICABLE DOCUMENTS
This section not applicable to this standard.
3. DEFINTIONS
This section not applicable to this standard.
4. GENERAL REQUIREMENTS
4.1. Test conditions.
4.1.1 Selection. In this method there are five test conditions, A, B, C, D, and E. The selection of test conditions to
perform the terminal-strength test depends on the type of terminal to be tested. The individual specification shall
specify the test condition required. The following is included as a guide to be used, as applicable:
Test condition A: Pull test - also known as a tension or tensile test for terminals. It is usually applicable to
most types of terminals.
Test condition B: Flat-terminal bend test - also known as a bend test. It is applicable to flexible-flat-strip or
tab-lead terminals which can be bent by finger pressure.
Test condition C: Wire-lead bend test - also known as a lead-fatigue, bend, or flexibility test. It is applicable to
solid-wire-lead terminals of limited ductility, such as nickel-alloy-type leads and those used
in hermetically-sealed component parts.
Test condition D: Twist test - also known as a torsion test. It is usually applicable to ductile, solid-wire-lead
terminals intended for wraparound connections.
Test condition E: Torque test - It is applicable to rigid-type terminals having either external screw threads or
threaded inserts which are located at the center of the terminal, or to other non-wire, rigid-
type terminals which should withstand the turning moment that results from a force applied
from an off-center point on the terminal.
1
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