GB/T 1451-2005 English PDF (GBT1451-2005)

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GB/T 1451-2005: Fiber-reinforced plastics composites -- Determination of Charpy impact properties
GB/T 1451-2005
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.120
Q 23
Replacing GB/T 1451-1983
Fiber-reinforced Plastics Composites - Determination of
Charpy Impact Properties
ISSUED ON. MAY 19, 2005
IMPLEMENTED ON. DECEMBER 01, 2005
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Test Principles... 4
4 Specimen... 4
5 Test Equipment... 6
6 Test Conditions... 7
7 Test Procedures... 7
8 Calculation... 7
9 Test Results... 8
10 Test Report... 8
Fiber-reinforced Plastics Composites-Determination of
Charpy Impact Properties
1 Scope
This standard specifies the specimens, equipment, conditions, procedures and results
calculation for measuring the impact properties with Charpy impact method.
This standard is applicable to measure the impact properties of fibre-reinforced
plastics composites specimens with nicks; while the impact properties measurement
of specimens without nicks may refer to this standard.
2 Normative References
The following standard contains provisions which, through reference in the following
text, constitute provisions of this standard. For dated reference, subsequent
amendments (excluding correction) to, or revisions of, any of these publications do
not apply. However, parties to agreements based on this standard are encouraged to
investigate the possibility of applying the most recent editions of the standards
indicated below. For undated references, the latest edition of the normative document
referred to applies.
GB/T 1446—2005 Fiber-reinforced plastics composites-The generals
3 Test Principles
Both ends of specimen with V-nick are horizontally placed on a support; the nick is
back on impact pendulum; then pendulum strike the middle specimen once to make
specimen generate stress concentration during impact and then enable the specimen to
break rapidly.
4 Specimen
4.1 Type and dimension of specimen
4.1.1 Type and dimension of fabric specimen whose nick direction is vertical to
layer are shown in Figure 1.
6 Test Conditions
Test conditions shall meet the provisions specified in Chapter 3 of GB/T 1446-2005.
7 Test Procedures
7.1 Specimen appearance inspection shall meet the provisions specified in Article
4.2 of GB/T 1446-2005.
7.2 Specimen status shall be adjusted according to the provisions specified in Article
4.4 of GB/T 1446-2005.
7.3 Those qualified specimens are numbered; then the width at nick of specimen is
measured and the minimum thickness at nick is measured with projector or other
measuring instrument. In addition, the measuring accuracy shall meet the provisions
stated in Article 4.5.1 of GB/T 1446-2005.
7.4 Pendulum with proper energy is selected so as to ensure the consumed power to
break specimen is within 10%~85% full scale.
7.5 Support span is adjusted to be (70±0.5)mm with sample plate with standard
span.
7.6 Whether spacer shall be added on a support is determined according to specimen
dimension and the position of center impacted by test machine. Spacer dimension
shall be determined basing on test machine conditions.
7.7 Before test, one non-load impact shall be carried out to adjust the pointer of
test-machine reading dial to point to zero.
7.8 The surface with nick of a specimen is back on pendulum. Specimen is placed
with specimen locating plate so as to enable the nick center to align with striking
center.
7.9 Impaction is carried out and the power consumed to break specimen as well as
breaking type shall be recorded.
7.10 Specimen with apparent internal defect or which doesn't break at nick shall be
abolished. Effective specimen amount in the same lot shall meet the provisions stated
in Article 4.3.Otherwise, test shall be carried out again.
8 Calculation
Impact properties is calculated according to the following formula.
Where,