塑料.测定高应变率拉伸特性

[中文适用范围]： 本国际标准规定了在各种应变率（包括适合冲击载荷情况的高应变率）下测定模塑和挤出塑料拉伸性能的程序。 通过低应变率和中等应变率下的测量组合、使用数学函数对这些结果进行建模、参数的速率依赖性以及通过外推法确定高应变率下的参数来确定性能。 然后通过计算得出高应变率下的拉伸性能。 通过这种方式，可以避免高速测量特性时出现的实验问题和相关误差。 低应变率和中等应变率下的性能测量基于 ISO 527-2，该标准确定了本国际标准适用的塑料材料类型。 [外文原描述]： ISO 18872:2007 specifies procedures for determining the tensile properties of moulding and extrusion plastics over a wide range of strain rate, including high rates appropriate to impact-loading situations. Properties are determined through a combination of measurements at low and moderate strain rates, the use of mathematical functions to model these results, the rate-dependence of parameters and the determination of parameters at high strain rates by extrapolation. Tensile properties at high strain rates are then derived by calculation. In this way, the experimental problems and associated errors with the measurement of properties at high rates are avoided.