GB/T 3355-1982 Test method for longitudinal and transverse shear of fiber reinforced plastics GB/T3355-1982 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
GB/T3355-1982
Longitudinal and transverse shear test of fiber reinforced plastics
1999—10—01
National Bureau of Standards
Page 1
sinoaec.com
Longitudinal and transverse shear test of fiber reinforced plastics》
3355-1982
1 Terminology
2 Test specimen
3 Test conditions..
4 Test steps
5 Calculation
6 Test results
7 Test report
Additional notes:Www.bzxZ.net
Page 2
Vertical and horizontal shear test of fiber reinforced plastics
This standard is applicable to the determination of the longitudinal and horizontal shear elastic modulus, longitudinal and horizontal shear strength zone
and longitudinal modulus shear stress-strain curve of unidirectional fiber or fabric reinforced plastic flat plates.
This standard adopts the (soil 45℃) S-layer plate tensile test method to determine the longitudinal and horizontal shear properties of the materialinoaec.com
Vertical and horizontal shear
Page 3
1 Terminology
Vertical and horizontal shear: For unidirectional or orthogonal fiber reinforced plastic flat plates (including single-layer plates), the shear stress state in which the shear stress direction is parallel to the longitudinal axis (L axis) and transverse axis (T axis) of the plate. Schematic diagrams of longitudinal and transverse shearing of unidirectional fiber reinforced plastic flat plates and longitudinal and transverse shearing of orthogonal fiber reinforced plastic flat plates are shown in Figures 1(a) and (b) respectively. sinoaec.co
Longitudinal and transverse shearing
Page 4
2 Specimens
2.1 The geometry and dimensions of the specimens are shown in Figure 2 (figure omitted). The thickness of the specimen is 2s to 6s of the thickness of the laminate. The thickness of the arbitration specimen is the thickness of the 3s ply inoaec.com
Note: s represents the mirror-symmetrical ply, such as 1s is [土45[0]]1s is (45[0]/45[0]/45[0]/45[0]]2.2 The number of specimens in each group shall be no less than 5. "Fiber
Longitudinal and transverse shear
Page 5
3 Test conditions
3.1 The standard environment for specimen state adjustment and testing shall be in accordance with GB1446 "General Rules for Test Methods for Properties of Fiber Reinforced Plastics".
3.2 The test equipment shall comply with the provisions of GB1446
3.3 Loading speed:
inoaec.com| |tt||3.3.1 When measuring the longitudinal and transverse shear strength, the loading speed is 1 to 6 mm/min. For carbon fiber reinforced plastics, the lower limit speed should be used.
3.3.2 When measuring the longitudinal and transverse shear elastic modulus or drawing the longitudinal and transverse shear stress-strain curve, the loading speed is 1 to 2 mm/min.
Longitudinal and Transverse Shear
Page 6
Longitudinal and Transverse Shear
Shear Test》
4.4 Number and mark the specimens, and measure the thickness and width of any three points in the working section, and take the arithmetic mean. Measurement precision 4.6 Install instruments to measure the deformation (or strain) of the specimen in the axial and perpendicular directions in the working section. Apply an initial load (approximately 4.7 Determine the longitudinal and transverse shear elastic modulus. When measuring the elastic modulus and drawing the shear stress-strain curve, use graded loading with a grade difference of 3 to 6% of the failure load, at least 5 grades, and record each load and the corresponding deformation or strain value. When using an automatic recording device, it can be up to 5% of the failure load), check and adjust the specimen and deformation (or strain) measurement system to make them in normal working condition. 4.1 Prepare the specimen in accordance with GB1446. When sampling, the axis of the specimen should be at an angle of 45[0] to the fiber direction. 4.10 Specimens that fail in the clamping section should be discarded. When there are less than 5 valid specimens in the same batch, the test should be repeated. 4.8 When measuring the longitudinal and transverse shear strength, load continuously until the specimen fails and record the maximum load value. 4 Test steps
4.5 Clamping test 4.3 Adjust the state of the specimen according to GB1446. 4.2 Check the appearance of the specimen according to GB1446. 4.9 Draw the load-deformation or load-strain curve. Degree according to GB1446.
Continue loading.
3355-1982
Page 7
5.1 Draw the stress-strain curve
5 Calculation
The shear stress and corresponding shear strain under each level of load are calculated according to formula (1) and formula (2) respectively: P[n]
t[n]LT-
y[n]LT=[n]x-[n]y'
Where: "nILT-
shear stress when the nth load is applied, kgf/cm[2] (MPa): Note: 1MPa=1N/mm[2]~10.2kgf/cm[2]. P[n]—nth load, kgf(N);
-sample width, cm(mm);
h—sample thickness, cm(mm):
y[n]LT-shear strain when the nth load is applied [n]x—axial strain of the sample when the nth load is applied [n]y—strain in the direction perpendicular to the sample axis when the nth load is applied. Note: 1J/cm[2]~10
2kgf.cm/cm[2].
5.2 The longitudinal and transverse shear strength is calculated according to formula (3): Pb
T[b]LT-
Where: T[b]LT——longitudinal and transverse shear strength, kgf/cm[2](MPa); Pb——maximum load of specimen failure, kgf(N). 5.3 The longitudinal and transverse shear elastic modulus is calculated according to formula (4) or formula (5). When graded loading is adopted:
When automatic recording device is adopted:
Page 8
Longitudinal and transverse shear test of reinforced plastics
5-1982
·(5
(Ax-Ay
Where: GLT——longitudinal and transverse shear elastic modulus, kgf/cm[2](MPa); △TLT——shear stress increment selected on the straight line segment of longitudinal and transverse shear stress-strain curve, inoaec.col
kgf/cm[2] (MPa);
△LT-shear strain increment corresponding to △TLT;△P load increment selected on the straight line segment of the load-strain curve, kgf(N);△x-specimen axial strain increment corresponding to △P;y-specimen axis vertical strain increment corresponding to △P. A
Vertical and horizontal!
55-1982
Page 9
Test results
Test results are in accordance with GB1446
sinoaec.com
Shear test》
Vertical and horizontal shear
Page 10
7Test report
Test report is in accordance with GB1446||t t||sinoaec.com
Shear Test》
Shear Test for Fiber Reinforced Plastics
Page 11
Additional Notes:
This standard was proposed by the State Building Materials Industry Bureau and the Ministry of Aviation Industry of the People's Republic of China, and is under the jurisdiction of the Fiber Reinforced Plastics Branch of the National Plastics Standardization Technical Committee. M
This standard was jointly drafted by the Shanghai Fiber Reinforced Plastics Research Institute of the State Building Materials Industry Bureau, the Institute of Aeronautical Materials, the Beijing Institute of Aeronautics and Astronauticsinoaec.coi
and Tongji University.
The main drafters of this standard are Xu Shoubo, Zhang Ruguang, Zhao Dezhen, Ma Xiaoteng, Yang Naibin, Fei Yunpeng《Fiber Reinforced Plastics
Shear Test for Fiber Reinforced Plastics
Page 12
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.