Trejo Carrillo David, Díaz Díaz Alberto
Centro de Investigación en Materiales Avanzados, S.C. (CIMAV), Av. Miguel de Cervantes #120, Complejo Industrial Chihuahua, Chihuahua C.P. 31136, Mexico.
Polymers (Basel). 2025 May 31;17(11):1535. doi: 10.3390/polym17111535.
This paper aims to investigate the mechanical behavior of a polycarbonate through cyclic tensile, compression, and torsiontests atstrain rates that reduce viscous effects for this material. Measurements included axial and transverse strains for uniaxial tests and shear strains for torsion. Tensile tests exhibited nonlinear elasticity, ratcheting, and plasticity, accompanied by an increase in volumetric strain. Compression tests revealed nonlinear elasticity, with the surprising result of positive plastic axial and volumetric strains, accompanied by marginal transverse strains. Torsional tests showed an elastic but nonlinear relationship between shear stress and strain. In these latter tests, positive plastic volumetric strains were observed, which suggests that deviatoric stress can also induce volumetric plastic strains. These findings are of great importance for developing mathematical models of glassy amorphous polymers, and the observations contribute to understanding the complex behavior of such materials.
本文旨在通过循环拉伸、压缩和扭转试验，研究聚碳酸酯在降低该材料粘性效应的应变率下的力学行为。测量内容包括单轴试验的轴向和横向应变以及扭转试验的剪切应变。拉伸试验表现出非线性弹性、棘轮效应和塑性，同时体积应变增加。压缩试验揭示了非线性弹性，令人惊讶的是出现了正的塑性轴向应变和体积应变，同时伴有微小的横向应变。扭转试验表明剪切应力与应变之间存在弹性但非线性的关系。在这些后期试验中，观察到了正的塑性体积应变，这表明偏应力也可诱导体积塑性应变。这些发现对于建立玻璃态非晶态聚合物的数学模型非常重要，这些观察结果有助于理解此类材料的复杂行为。
