93.
Tensile impact experiments of EC8.0−24×7 glass fiber bundles at different low temperatures
T(14°C, −40°C and −10°C) and strain rates ɛ were carried out, and complete stress-strain curves were obtained. Within the range
of the experiment temperatures and strain rates, it is found that the initial modulus
E, the ultimate strength σ
max and the unstable strain ɛ
b
of the glass fiber bundles all increase with ɛ at an identical
T. At an identical ɛ, with the decrease of
T, E and σ
max increase; but ɛ
b
increases when 10°C>
T>−40°C and decreases when −40°C>
T>−100°C. The strain-rate- and temperature-dependent bimodal Weibull statistical constitutive theory was adopted for the statistical
analysis of the experimental results, and the Weibull parameters of single fiber were obtained. The results show that the
bimodal Weibull distribution function is suitable to represent the strength distribution of the glass fiber at low temperature
and different strain rates. The differences in the mechanical properties between EC8.0−24×7 and EC5.5−12 ×14 glass fiber bundles
were also discussed.
Project supported by the National Natural Science Foundation of China (No. 19772058).
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