Abstract

In this work the response of soft open-cell polyurethane foams with three different densities, respectively of 85, 63 and 46 kg/m³, were obtained by quasi-static tensile, shear and cyclic compression tests. The presence of an intrinsic random pattern inside the material given by the small black dot of expanded graphite, that makes it fireproof, allowed to detect large displacement fields exploiting digital image correlation technique, without painting the surface to quantify the full-field displacement of the samples. The displacements’ maps, the strain fields and the stress-strain curves obtained by digital image correlation allowed the analysis and the evaluation of the mechanical properties.

摘要

在这项工作中，通过准静态拉伸、剪切和循环压缩试验获得了三种不同密度（分别为 85、63 和 46 kg/m ^{3 ）的软质开孔聚氨酯泡沫的响应。}由膨胀石墨的小黑点给出的材料内部存在固有随机图案，使其具有防火性，允许利用数字图像相关技术检测大位移场，而无需绘制表面以量化全场位移样品。通过数字图像相关获得的位移图、应变场和应力-应变曲线允许对力学性能进行分析和评估。