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首页> 外文期刊>Journal of Applied Polymer Science >Nanoindentation of isotactic polypropylene: Correlations between hardness, yield stress, and modulus on the local and global scales
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Nanoindentation of isotactic polypropylene: Correlations between hardness, yield stress, and modulus on the local and global scales

机译：全同立构聚丙烯的纳米压痕：局部和整体尺度上硬度，屈服应力和模量之间的关系

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摘要

The correlations between the hardness, yield stress, and modulus of elasticity of isotactic polypropylene (iPP) were evaluated on the local and global scales. Nanoindentation and traditional macromechanical tests were incorporated for this purpose. Thus, local and global mechanical properties were measured at various temperatures and strain rates. A certain relation was found between the local and global mechanical properties. Moreover, Johnson's model (developed according to the expanding cavity model) was also evaluated at various temperatures and strain rates. The Johnson model was valid only for the yield stresses obtained by nanoindentation and compressive tests and also the elastic modulus obtained via nanoindentation.
机译：在局部和整体尺度上评估了全同立构聚丙烯（iPP）的硬度，屈服应力和弹性模量之间的相关性。为此目的，采用了纳米压痕和传统的宏观力学测试。因此，在各种温度和应变速率下测量了局部和整体机械性能。发现局部和整体机械性能之间存在一定关系。此外，还对约翰逊模型（根据膨胀腔模型开发）在各种温度和应变速率下进行了评估。 Johnson模型仅对通过纳米压痕和压缩测试获得的屈服应力以及通过纳米压痕获得的弹性模量有效。

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